C / C++ / MFC

// InjectDLL.cpp : Defines the entry point for the console application.
//
 
#include "stdafx.h"
using namespace std;
 
#ifdef __cplusplus
extern "C"
{
#endif
 
void __stdcall SetHook();
 
#ifdef __cplusplus
}
#endif

int main(int argc, char* argv[])
{
	SetHook();
 
	return 0;
}

// InjectMe.cpp : Defines the entry point for the DLL application.
//
 
#include "stdafx.h"
#include <tchar.h>
 
HMODULE g_hMod = NULL;
 
#pragma comment(linker, "/SECTION:.shared,RWS")
#pragma data_seg(".shared")
HHOOK g_hHook = NULL;
#pragma data_seg()
 
LRESULT CALLBACK GetMsgProc(int code, WPARAM wParam, LPARAM lParam)
{
	LRESULT res = CallNextHookEx(NULL, code, wParam, lParam);
 
	static bool bDone = false;
	if (bDone && res==HC_ACTION)
	{
		bDone = true;
 
		UnhookWindowsHookEx(g_hHook);
 
		::MessageBox(NULL, _T("Hello"), _T("Hello"), MB_OK);
	}
 
	return res;
}
 
#ifdef __cplusplus
extern "C"
{
#endif
 
void __stdcall SetHook()
{
	// Find Notepad's window.
	HWND hwnd = FindWindow(_T("Notepad"), NULL);
	if (hwnd == NULL)
	{
		return;
	}
 
	// Get the main thread's ID.
	DWORD ThreadId = GetWindowThreadProcessId(hwnd, NULL);
 
	// Hook it.
	HHOOK g_hHook = SetWindowsHookEx(
				WH_GETMESSAGE,					// int idHook
				reinterpret_cast<HOOKPROC>(&GetMsgProc),	// HOOKPROC lpfn
				g_hMod,						// HINSTANCE hMod
				ThreadId					// DWORD dwThreadId
				);
	if (g_hHook == NULL)
	{
		return;
	}


	// Post a "do nothing" message to Notepad so our hook is called.
	PostMessage(hwnd, WM_NULL, 0, 0);
}
 
#ifdef __cplusplus
}
#endif
 
BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
					 )
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
		g_hMod = reinterpret_cast<HMODULE>(hModule);
		DisableThreadLibraryCalls(g_hMod);
		break;
	}

    return TRUE;
}

Hamid. wrote:

I think if you used of editbox was better.