How to get the parent process ID of a process, thanks

  • Thread starter Thread starter linuxfedora
  • Start date Start date
L

linuxfedora

Hi All,

How to get the parent process ID of a process, thanks

Beside using performanceCounter

i found that we can use lpfCreateToolhelp32Snapshot, but i cannot
convert it to win32 version correctly, what is the problem?Thanks

[DllImport("Psapi.dll")]
private static extern IntPtr lpfCreateToolhelp32Snapshot(int
value, int value1);

[DllImport("Kernel32.dll")]
private static extern bool lpfProcess32First(IntPtr pointer,
out PROCESSENTRY32 value);

[DllImport("Kernel32.dll")]
private static extern bool lpfProcess32Next(IntPtr pointer,
out PROCESSENTRY32 value);


[StructLayout(LayoutKind.Sequential)]
public struct PROCESSENTRY32
{
public uint dwSize;
public uint cntUsage;
public uint th32ProcessID;
public IntPtr th32DefaultHeapID;
public uint th32ModuleID;
public uint cntThreads;
public uint th32ParentProcessID;
public int pcPriClassBase;
public uint dwFlags;
public string szExeFile;
}

private uint GetProcessParentID(int pid)
{
IntPtr hSnapShot = lpfCreateToolhelp32Snapshot(0x2, 0);

PROCESSENTRY32 procentry = new PROCESSENTRY32();
bool bContinue = lpfProcess32First(hSnapShot, out
procentry);

while (bContinue)
{
if (pid == procentry.th32ProcessID)
{
return procentry.th32ParentProcessID;
}

bContinue = lpfProcess32Next(hSnapShot, out
procentry);
}

return 0;
}
 
linuxfedora said:
sorry, [DllImport("toolhelp.dll")]
private static extern IntPtr lpfCreateToolhelp32Snapshot(int
value, int value1);
Click to expand...

How is that different from what you posted before?
but still not work?
Click to expand...

What, specifically, is not working for you? It would be helpful if
you'd post a concise-but-complete code example that reliably
demonstrates whatever problem you're having.

In the meantime, try setting the "dwSize" field of your PROCESSENTRY32
structure before calling lpfProcess32First().

Pete
 
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