Getting Items from ListView from other application

[Jacek]

Hi
If it is wrong newsgroup, please let me know where to find the answer.
I am trying to get item text form ListView (there are few items and 5
columns) from other application (application written in MFC). As I know I
have to allocate memory in target application address space, send a message
and than read from allocated memory. But I still doing something wrong and
can't find correct solution. I fell I am close to it. Please find code below
(C#) :

[StructLayout( LayoutKind.Sequ ential)]
public struct LV_ITEMA
{
public int mask;
public int iItem;
public int iSubItem;
public int state;
public int stateMask;
public IntPtr pszText;
public int cchTextMax;
public int iImage;
public int lParam;
public int iIndent;
}
/// <summary>
/// Summary description for ListViewItem.
/// </summary>
public class ListViewItem
{
public ListViewItem()
{
}

public const int PROCESS_QUERY_I NFORMATION = 1024;
public const int PROCESS_VM_OPER ATION = 0x8;
public const int PROCESS_VM_READ = 0x10;
public const int PROCESS_VM_WRIT E = 0x20;
public const int STANDARD_RIGHTS _REQUIRED = 0xF0000;
public const int MAX_LVMSTRING = 255;
public const int MEM_COMMIT = 0x1000;
public const int MEM_RELEASE = 0x8000;
public const int PAGE_READWRITE = 0x4;
public const int LVIF_TEXT = 0x1;

private const int LVM_FIRST = 0x1000;
private const int LVM_GETITEMCOUN T = LVM_FIRST + 4;
private const int LVM_GETCOLUMN = LVM_FIRST + 25;
private const int LVM_GETITEM = LVM_FIRST + 5;
private const int LVM_GETITEMTEXT = 0x102D;

bool result;
IntPtr pHandle;
IntPtr pStrBufferMemor y;
IntPtr pMyItemMemory;

[DllImport("kern el32.dll")]
public static extern IntPtr OpenProcess(int dwDesiredAccess , bool
bInheritHandle, int dwProcId );
[DllImport("kern el32.dll")]
public static extern IntPtr VirtualAllocEx( IntPtr hProcess,IntPtr lpAddress,
int dwSize, int flAllocationTyp e, int flProtect );
[DllImport("kern el32.dll")]
public static extern bool VirtualFreeEx(I ntPtr hProcess, IntPtr lpAddress,
int dwSize, int dwFreeType);
[DllImport("kern el32.dll")]
public static extern bool WriteProcessMem ory(IntPtr hProcess, IntPtr
lpBaseAddress,r ef LV_ITEMA lpBuffer, int nSize, ref int
lpNumberOfBytes Written);
[DllImport("kern el32.dll")]
public static extern bool ReadProcessMemo ry(IntPtr hProcess, IntPtr
lpBaseAddress, ref LV_ITEMA lpBuffer, int nSize, ref int
lpNumberOfBytes Written);
[DllImport("user 32.dll")]
public static extern int SendMessage(Int Ptr hWnd, int Msg, int wParam,
IntPtr lParam);
[DllImport("kern el32.dll")]
public static extern bool CloseHandle(Int Ptr hObject);

public void Run(IntPtr ptr)
{
strBuffer = new byte[MAX_LVMSTRING];
Process [] localByName = Process.GetProc essesByName("my Process");
Process proc = localByName[0];
pHandle = OpenProcess(PRO CESS_VM_OPERATI ON | PROCESS_VM_READ |
PROCESS_VM_WRIT E, false, proc.Id);
pStrBufferMemor y = VirtualAllocEx( pHandle,IntPtr. Zero, MAX_LVMSTRING,
MEM_COMMIT, PAGE_READWRITE) ;
LV_ITEMA lv = new LV_ITEMA();
lv.mask = LVIF_TEXT;
lv.iItem = 1;
lv.iSubItem = 5;
lv.pszText = pStrBufferMemor y;
lv.cchTextMax = MAX_LVMSTRING;
pMyItemMemory = VirtualAllocEx( pHandle,IntPtr. Zero, Marshal.SizeOf( lv),
MEM_COMMIT, PAGE_READWRITE) ;
IntPtr lvptr = Marshal.AllocHG lobal(Marshal.S izeOf(lv));
Marshal.Structu reToPtr(lv,lvpt r,false);
int written = 0;
result = WriteProcessMem ory(pHandle, pMyItemMemory,r ef lv,
Marshal.SizeOf( lv), ref written);

int i = SendMessage(ptr , LVM_GETITEM, 0, pMyItemMemory);
i = SendMessage(ptr , LVM_GETITEMTEXT , 1, pStrBufferMemor y);
IntPtr ppr = IntPtr.Zero;
int read = 0;
StringBuilder str = new StringBuilder(M AX_LVMSTRING);
result = ReadProcessMemo ry(pHandle, pMyItemMemory,r ef lv, written,ref read);
string str1 = Marshal.PtrToSt ringAnsi(lv.psz Text);
}

As a result of i = SendMessage(ptr , LVM_GETITEMTEXT , 1, pStrBufferMemor y);
I'm receiving 0 - means false and
string str1 = Marshal.PtrToSt ringAnsi(lv.psz Text);
Gives me an error : Object instance not set to object.
Please help
Thanks in advance
brgds
Jacek