Windows挂钩注入DLL

注入DLL实现源码：
HINSTANCE g_hInstDll = NULL;
HHOOK g_hHook = NULL;
DWORD g_dwThreadId = 0;

#ifdef _MANAGED
#pragma managed(push, off)
#endif

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
					 )
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
		g_hInstDll = (HINSTANCE)hModule;
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
    return TRUE;
}

#ifdef _MANAGED
#pragma managed(pop)
#endif

INT_PTR WINAPI DipDlg_Proc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {

	switch (uMsg)
	{
	case WM_CLOSE:
		{
			DestroyWindow(hWnd);
		}
		break;
	case WM_APP:
		if (lParam)
		{
			ShowWindow(hWnd, SW_SHOW);
		}

		break;
	}

	return(FALSE);
}

LRESULT CALLBACK ProcHookMsg(int nCode, WPARAM wp, LPARAM lp)
{
	static BOOL bFirstTime = TRUE;
	if (bFirstTime)
	{
		bFirstTime = FALSE;

		// 从一个对话框模版资源创建一个无模式的对话框
		CreateDialog(g_hInstDll, MAKEINTRESOURCE(IDD_DIPS), NULL, DipDlg_Proc);

		PostThreadMessage(g_dwThreadId, WM_NULL, 0, 0);
	}
	return (CallNextHookEx(g_hHook, nCode, wp, lp));
}

// 设置钩子函数
DIPSLIB_API BOOL SetDipsHook(DWORD dThreadId)
{
	BOOL bRet = FALSE;
	if (dThreadId != 0)
	{
		g_dwThreadId = dThreadId;
		g_hHook = SetWindowsHookEx(WH_GETMESSAGE, ProcHookMsg, g_hInstDll, dThreadId);

		if (NULL != g_hHook)
		{
			bRet = PostThreadMessage(dThreadId, WM_NULL, NULL, NULL);
		}
	}
	else
	{
		if (g_hHook != NULL)
		{
			bRet = UnhookWindowsHookEx(g_hHook);
			g_hHook = NULL;
		}
	}

	return bRet;
}
代理进程实现源码：

HWND g_DestWindowWnd= NULL;

// 此代码模块中包含的函数的前向声明:
ATOM				MyRegisterClass(HINSTANCE hInstance);
BOOL				InitInstance(HINSTANCE, int);
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK	About(HWND, UINT, WPARAM, LPARAM);

BOOL CALLBACK ProcEnumChildWindows(HWND hWnd, LPARAM lp)
{
	CHAR pBuff[MAX_PATH] = {0};
	GetWindowText(hWnd, pBuff, MAX_PATH);

	if (0 == strcmp("FolderView", pBuff))
	{
		g_DestWindowWnd = hWnd;

		// 返回0就停止枚举
		return 0;
	}

	return TRUE;
}
int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
	UNREFERENCED_PARAMETER(hPrevInstance);
	UNREFERENCED_PARAMETER(lpCmdLine);

 	// TODO: 在此放置代码。
	MSG msg;
	HACCEL hAccelTable;

	// 初始化全局字符串
	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
	LoadString(hInstance, IDC_DIPS, szWindowClass, MAX_LOADSTRING);
	MyRegisterClass(hInstance);

	// 执行应用程序初始化:
	if (!InitInstance (hInstance, nCmdShow))
	{
		return FALSE;
	}

	hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_DIPS));

	HWND hPromanWnd = FindWindow("ProgMan", NULL);

	EnumChildWindows(hPromanWnd, ProcEnumChildWindows, NULL);

	DWORD nThreadId, nProcessId;
	nThreadId = GetWindowThreadProcessId(g_DestWindowWnd, &nProcessId);
	SetDipsHook(nThreadId);
	// 主消息循环:
	while (GetMessage(&msg, NULL, 0, 0))
	{
		HWND hWndDIPS = FindWindow(NULL, TEXT("Test Dips"));
		SendMessage(hWndDIPS, WM_APP, (WPARAM) g_DestWindowWnd, TRUE);
		Sleep(2000);
		SendMessage(hWndDIPS, WM_CLOSE, 0, 0);
		SetDipsHook(0);
	}

	return 0;
}