Enumerating Windows

J

Jay

Hey There,
I have this function that is called through EnumWindows:

BOOL CALLBACK EnumOpenWindows(HWND hwnd, LPARAM lParam)
{
DWORD dwID;
LPDWORD dwID2;
LPDWORD currProcId;
FILE* fp;
struct _HwndProcStruct* locHPStruct;

fp = fopen(THREAD_LOG_FILE,APPEND_MODE);
fprintf(fp,"*******************<EnumOpenWindows>*******************\n");
fclose(fp);

dwID2 = (LPDWORD)calloc(1,sizeof(DWORD));
locHPStruct = (struct _HwndProcStruct*)lParam;
*currProcId = locHPStruct->procID;
*dwID2 = 0;

GetWindowThreadProcessId(hwnd, dwID2);

fp = fopen(THREAD_LOG_FILE,APPEND_MODE);
fprintf(fp,"currProcId=%d dwID2=%d\n",*currProcId,*dwID2);
fclose(fp);

if(*dwID2 == *currProcId)
{
locHPStruct->WindHandle = hwnd;
free(dwID2);
return FALSE;
}
else
{
free(dwID2);
return TRUE;
}
}

I'm using it to try to find the HWND from a Process ID. For some
reason, when I have the file print statements below
"GetWindowThreadProcessId(hwnd, dwID2); " the function will generate
the following error:

Unhandled exception at 0x0040126c in SysTrayApp.exe: 0xC0000005: Access
violation writing location 0x000809be.

But if I comment out those three lines, then the function executes
normally. What could cause this?

-Jay
(patelj27b at gmail dot com)
 
T

Tamas Demjen

Jay said:
dwID2 = (LPDWORD)calloc(1,sizeof(DWORD));
Click to expand...

Why do you do a dynamic memory allocation here? The size of your object
is known, just create your variable on the stack:

unsigned process_id;
GetWindowThreadProcessId(hwnd, &process_id);
*currProcId = locHPStruct->procID;
Click to expand...

currProcId is uninitialized, yet you're resolving it, as if it was a
valid pointer. This is causing your Access Violation. Once again,
there's no reason to use a pointer here. How about

unsigned currProcId = locHPStruct->procID;

Tom
 
J

Jay

Tamas said:
Why do you do a dynamic memory allocation here? The size of your object
is known, just create your variable on the stack:

unsigned process_id;
GetWindowThreadProcessId(hwnd, &process_id);


currProcId is uninitialized, yet you're resolving it, as if it was a
valid pointer. This is causing your Access Violation. Once again,
there's no reason to use a pointer here. How about

unsigned currProcId = locHPStruct->procID;

Tom
Click to expand...


Tom,
Thanks for the reply, I don't why I was doing all that! I have
another question though. Now that I have that resolved, I have the
following lines of code:
retVal =
CreateProcess(NULL,modName,NULL,NULL,FALSE,NULL,NULL,NULL,&si,&pi);
procID = pi.dwProcessId;
HPStruct.procID = procID;
HPStruct.WindHandle = 0;
EnumWindows((WNDENUMPROC)EnumOpenWindows,(LPARAM)&HPStruct);


As you can see, I am enumerating the windows almost immediately after
creating the process. Why is it that the window handle id for the newly
created process is not in the list of processes that is enumerated? The
output from the function is below:
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=3660
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1300
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1276
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1276
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=3740
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=2376
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=2320
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=3660
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=3660
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=3660
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=3660
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=2156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1068
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1252
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1252
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1252
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1252
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1252
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1252
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1252
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1252
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1252
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1252
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1252
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1252
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1400
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1252
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1276
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1276
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1260
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1276
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1276
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1276
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1244
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=788
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1848
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1460
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156
*******************<EnumOpenWindows>*******************
currProcId=2512 dwID2=1156

Any ideas?

Thanks,
Jay
(patelj27b at gmail dot com)
 
T

Tamas Demjen

Jay said:
Now that I have that resolved, I have the
following lines of code:
retVal =
CreateProcess(NULL,modName,NULL,NULL,FALSE,NULL,NULL,NULL,&si,&pi);
procID = pi.dwProcessId;
HPStruct.procID = procID;
HPStruct.WindHandle = 0;
EnumWindows((WNDENUMPROC)EnumOpenWindows,(LPARAM)&HPStruct);


As you can see, I am enumerating the windows almost immediately after
creating the process.
Click to expand...

Probably that's the problem. CreateProcess returns almost immediately,
well before the new process has a chance to open a window. You might
want to wait for the process to launch:

CreateProcess(...);
HPStruct.procID = pi.dwProcessId;
HPStruct.WindHandle = 0;
WaitForSingleObject(pi.hProcess, INFINITE);
EnumWindows(...);

Tom
 
T

Tamas Demjen

Tamas said:
WaitForSingleObject(pi.hProcess, INFINITE);
Click to expand...

Sorry this is not good, it waits for the process to exit. This is not a
solution.

Well I don't know, but the problem seems to be that the window shows up
later in time, after EnumWindows has a chance to see it. You might want
to repeat the window enumeration a few times until it shows up, with a
little bit of Sleep() in between attempts. This would be my first guess.

Tom
 
T

Tamas Demjen

Tamas said:
Probably that's the problem. CreateProcess returns almost immediately,
well before the new process has a chance to open a window. You might
want to wait for the process to launch:
Click to expand...

I think I've found the correct solution, it's WaitForInputIdle:

CreateProcess(...);
HPStruct.procID = pi.dwProcessId;
HPStruct.WindHandle = 0;
WaitForInputIdle(pi.hProcess, INFINITE);
EnumWindows(...);


Quoted from MSDN:

The WaitForInputIdle function enables a thread to suspend its execution
until a specified process has finished its initialization and is waiting
for user input with no input pending. This can be useful for
synchronizing a parent process and a newly created child process. When a
parent process creates a child process, the CreateProcess function
returns without waiting for the child process to finish its
initialization. Before trying to communicate with the child process, the
parent process can use WaitForInputIdle to determine when the child's
initialization has been completed. For example, the parent process
should use WaitForInputIdle before trying to find a window associated
with the child process.

Tom
 

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question

Similar Threads

Flash Player Launching Process With CreateProcess 8

Top