/// <summary>
/// Returns the text for a specific item
/// </summary>
/// <param name="hWnd"></param>
/// <param name="text"></param>
/// <returns></returns>
public string GetItemText(int itemHwnd)
{
const int dwBufferSize = 1024;
int dwProcessID;
Win32.TVITEM tvItem;
string retval;
bool bSuccess;
IntPtr hProcess = IntPtr.Zero;
IntPtr lpRemoteBuffer = IntPtr.Zero;
IntPtr lpLocalBuffer = IntPtr.Zero;
IntPtr threadId = IntPtr.Zero;
try
{
tvItem = new Win32.TVITEM();
// Allocate a buffer in the local process
lpLocalBuffer = Marshal.AllocHGlobal(dwBufferSize);
// Get the process id owning the treeview
threadId = Win32.GetWindowThreadProcessId(handle, out dwProcessID);
if((threadId == IntPtr.Zero) || (dwProcessID == 0))
throw new ArgumentException("Could not found thread process id");
// Open the process with all access
hProcess = Win32.OpenProcess(Win32.PROCESS_ALL_ACCESS, false, dwProcessID);
if(hProcess == IntPtr.Zero)
throw new ApplicationException("Failed to access process");
// Allocate a buffer in the remote process
lpRemoteBuffer = Win32.VirtualAllocEx(hProcess, IntPtr.Zero, dwBufferSize, Win32.MEM_COMMIT, Win32.PAGE_READWRITE);
if(lpRemoteBuffer == IntPtr.Zero)
throw new SystemException("Failed to allocate memory in remote process");
// Fill in the TVITEM struct, this is in your own process
// Set the pszText member to somewhere in the remote buffer,
// In this case we use the address imediately following the TVITEM stuct
tvItem.mask = ((int)Win32.TVIF.TEXT | (int)Win32.TVIF.HANDLE);
tvItem.hItem = itemHwnd;
tvItem.pszText = (IntPtr)(lpRemoteBuffer.ToInt32() + Marshal.SizeOf(typeof(Win32.TVITEM)));
tvItem.cchTextMax = 1024;
// Copy the local LVITEM to the remote buffer
bSuccess = Win32.WriteProcessMemory(hProcess, lpRemoteBuffer, ref tvItem, Marshal.SizeOf(typeof(Win32.TVITEM)), IntPtr.Zero);
if(!bSuccess)
throw new SystemException("Failed to write to process memory");
// Send the message to the remote window with the address of the remote buffer
Win32.SendMessage((System.IntPtr)handle, (int)Win32.TVM.GETITEM, itemHwnd, lpRemoteBuffer);
// Read the struct back from the remote process into local buffer
bSuccess = Win32.ReadProcessMemory(hProcess, lpRemoteBuffer, lpLocalBuffer, dwBufferSize, IntPtr.Zero);
if(!bSuccess)
throw new SystemException("Failed to read from process memory");
// At this point the lpLocalBuffer contains the returned LV_ITEM structure
// the next line extracts the text from the buffer into a managed string
retval = Marshal.PtrToStringAuto((IntPtr)(lpLocalBuffer.ToInt32() + Marshal.SizeOf(typeof(Win32.TVITEM))));
}
catch (Exception e)
{
// If an exception occurred, return the error string
retval = e.Message;
}
finally
{
// Make sure to clean up memory buffers!
if(lpLocalBuffer != IntPtr.Zero)
Marshal.FreeHGlobal( lpLocalBuffer );
if(lpRemoteBuffer != IntPtr.Zero)
Win32.VirtualFreeEx(hProcess, lpRemoteBuffer, 0, Win32.MEM_RELEASE);
if( hProcess != IntPtr.Zero )
Win32.CloseHandle(hProcess);
}
// Return what we found
return retval;
}
/// <summary>
/// Returns the text for a specific item
/// </summary>
/// <param name="hWnd"></param>
/// <param name="text"></param>
/// <returns></returns>
public string GetItemText(int itemHwnd)
{
const int dwBufferSize = 1024;
int dwProcessID;
Win32.TVITEM tvItem;
string retval;
bool bSuccess;
IntPtr hProcess = IntPtr.Zero;
IntPtr lpRemoteBuffer = IntPtr.Zero;
IntPtr lpLocalBuffer = IntPtr.Zero;
IntPtr threadId = IntPtr.Zero;
try
{
tvItem = new Win32.TVITEM();
// Allocate a buffer in the local process
lpLocalBuffer = Marshal.AllocHGlobal(dwBufferSize);
// Get the process id owning the treeview
threadId = Win32.GetWindowThreadProcessId(handle, out dwProcessID);
if ((threadId == IntPtr.Zero) || (dwProcessID == 0))
{
throw new ArgumentException("Could not found thread process id");
}
// Open the process with all access
hProcess = Win32.OpenProcess(Win32.PROCESS_ALL_ACCESS, false, dwProcessID);
if (hProcess == IntPtr.Zero)
{
throw new ApplicationException("Failed to access process");
}
// Allocate a buffer in the remote process
lpRemoteBuffer = Win32.VirtualAllocEx(hProcess, IntPtr.Zero, dwBufferSize, Win32.MEM_COMMIT, Win32.PAGE_READWRITE);
if (lpRemoteBuffer == IntPtr.Zero)
{
throw new SystemException("Failed to allocate memory in remote process");
}
// Fill in the TVITEM struct, this is in your own process
// Set the pszText member to somewhere in the remote buffer,
// In this case we use the address imediately following the TVITEM stuct
tvItem.mask = ((int)Win32.TVIF.TEXT | (int)Win32.TVIF.HANDLE);
tvItem.hItem = itemHwnd;
tvItem.pszText = (IntPtr)(lpRemoteBuffer.ToInt32() + Marshal.SizeOf(typeof(Win32.TVITEM)));
tvItem.cchTextMax = 1024;
// Copy the local LVITEM to the remote buffer
bSuccess = Win32.WriteProcessMemory(hProcess, lpRemoteBuffer, ref tvItem, Marshal.SizeOf(typeof(Win32.TVITEM)), IntPtr.Zero);
if (!bSuccess)
{
throw new SystemException("Failed to write to process memory");
}
// Send the message to the remote window with the address of the remote buffer
Win32.SendMessage((System.IntPtr)handle, (int)Win32.TVM.GETITEM, itemHwnd, lpRemoteBuffer);
// Read the struct back from the remote process into local buffer
bSuccess = Win32.ReadProcessMemory(hProcess, lpRemoteBuffer, lpLocalBuffer, dwBufferSize, IntPtr.Zero);
if (!bSuccess)
{
throw new SystemException("Failed to read from process memory");
}
// At this point the lpLocalBuffer contains the returned LV_ITEM structure
// the next line extracts the text from the buffer into a managed string
retval = Marshal.PtrToStringAuto((IntPtr)(lpLocalBuffer.ToInt32() + Marshal.SizeOf(typeof(Win32.TVITEM))));
}
catch (Exception e)
{
// If an exception occurred, return the error string
retval = e.Message;
}
finally
{
// Make sure to clean up memory buffers!
if (lpLocalBuffer != IntPtr.Zero)
{
Marshal.FreeHGlobal(lpLocalBuffer);
}
if (lpRemoteBuffer != IntPtr.Zero)
{
Win32.VirtualFreeEx(hProcess, lpRemoteBuffer, 0, Win32.MEM_RELEASE);
}
if (hProcess != IntPtr.Zero)
{
Win32.CloseHandle(hProcess);
}
}
// Return what we found
return(retval);
}
