LVM_GETITEMTEXT does not work

[janhavib]

Hi,

I'm trying to access listview control in a VB application from C#
application.
Follwoing is my code
StructLayoutAttribute(LayoutKi­nd.Sequential)]
public struct LV_ITEM
{
public UInt32 mask;
public Int32 iItem;
public Int32 iSubItem;
public UInt32 state;
public UInt32 stateMask;
public String pszText;
public Int32 cchTextMax;
public Int32 iImage;
public IntPtr lParam;



}const int BUFFER_SIZE = 512;


LV.iItem = 3;
LV.mask = Win32API.LVIF_IMAGE;
LV.cchTextMax = 255;
LV.iSubItem = 0;
LV.pszText = new String('\0', 255);

Win32API.SendMessage(hWnd, Win32API.LVM_GETITEMTEXT, 3, ref LV);
string text = LV.pszText.ToString();


My definations are as given below.


const int LVM_FIRST = 0x1000;
const int LVM_GETITEMCOUNT = LVM_FIRST + 4;
const int LVM_GETITEM = LVM_FIRST + 5;
const int LVIF_TEXT = 0x0001;
LVM_GETITEMTEXT = (LVM_FIRST + 45);


[DllImport("user32.dll")]
static extern int SendMessage(IntPtr window, int message, int wparam,
ref LV_ITEM lparam);


My Problem is pszText always returns empty string.
Please help.


Thanks in advance.
J

 

[Mattias Sjögren]

I'm trying to access listview control in a VB application from C#

application.

The message will not work cross processes because the pointer to the
LV_ITEM struct is invalid in the target process. If you implement both
applications you may want to use the WM_COPYDATA message or some other
IPC mechanism instead.



Mattias