安装全局钩子程序（鼠标钩子）

新建win32 dynamic link library   HookDll，有两个文件.c和.def

HookDll.c

#include <windows.h>

HHOOK mouseHook;                  //接收由SetWindowsHookEx返回的旧的钩子

HINSTANCE hmod;

BOOL WINAPI DllMain(HINSTANCE hinstDLL,
					DWORD fdwReason,
					LPVOID lpvReserved)
{
	hmod = hinstDLL;
	return TRUE;
}

//回调函数，用于处理截获的按键消息
LRESULT CALLBACK MouseProc(int code, WPARAM wParam, LPARAM lParam)
{
	if(wParam == WM_RBUTTONDOWN)
	{
		MessageBox(NULL,TEXT("aaa"), TEXT("bbb"), MB_OK);        //输出按键信息，注意这里按下和弹起都会输出
		return 1;
	}else{
		return CallNextHookEx(mouseHook,code,wParam,lParam);  //将消息还给钩子链，不要影响别人
	}
}

void SetHook()
{
	//安装钩子
	mouseHook = SetWindowsHookEx(WH_MOUSE,
                                (HOOKPROC)&MouseProc,   //回调函数地址
                                hmod, 
                                0);
} 

void UnLockHook()
{
	UnhookWindowsHookEx (mouseHook);
}

HookDll.def

LIBRARY HookDll
EXPORTS
	SetHook @1
	UnLockHook @2

加入.def文件即可生成.lib(或者在函数前加extern "C")，表示以C的方式编译导出

在P先生的Hello win98 基础上加入钩子

/*------------------------------------------------------------
HELLOWIN.C -- Displays "Hello, Windows 98!" in client area
(c) Charles Petzold, 1998
------------------------------------------------------------*/
#include <windows.h>

#pragma comment(lib,"HookDll");

_declspec(dllimport) void SetHook();
_declspec(dllimport) void UnLockHook();

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
 
HWND         hwnd ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
	static TCHAR szAppName[] = TEXT ("HelloWin") ;
	
	MSG          msg ;
	WNDCLASS     wndclass ;
	
	wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
	wndclass.lpfnWndProc   = WndProc ;
	wndclass.cbClsExtra    = 0 ;
	wndclass.cbWndExtra    = 0 ;
	wndclass.hInstance     = hInstance ;
	wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
	wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
	wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
	wndclass.lpszMenuName  = NULL ;
	wndclass.lpszClassName = szAppName ;
	
	if (!RegisterClass (&wndclass))
	{
		MessageBox (NULL, TEXT ("This program requires Windows NT!"), 
			szAppName, MB_ICONERROR) ;
		return 0 ;
	}
	
	hwnd = CreateWindow (szAppName,                  // window class name
						 TEXT ("The Hello Program"), // window caption
						 WS_OVERLAPPEDWINDOW,        // window style
						 CW_USEDEFAULT,              // initial x position
						 CW_USEDEFAULT,              // initial y position
						 CW_USEDEFAULT,              // initial x size
						 CW_USEDEFAULT,              // initial y size
						 NULL,                       // parent window handle
						 NULL,                       // window menu handle
						 hInstance,                  // program instance handle
						 NULL) ;                     // creation parameters
	
	ShowWindow (hwnd, iCmdShow) ;
	UpdateWindow (hwnd) ;
	
	while (GetMessage (&msg, NULL, 0, 0))
	{
		TranslateMessage (&msg) ;
		DispatchMessage (&msg) ;
	}
	return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	HDC         hdc ;
	PAINTSTRUCT ps ;
	RECT        rect ;
	POINT point;
	int x, y;
	
	switch (message)
	{
	case WM_CREATE:
		//PlaySound (TEXT ("hellowin.wav"), NULL, SND_FILENAME | SND_ASYNC) ;
		//安装钩子
		SetHook();
		return 0 ;

	case WM_KEYDOWN:
		hdc = GetDC(hwnd);

		GetCursorPos(&point);			// 获取鼠标指针位置（屏幕坐标）
		ScreenToClient(hwnd, &point);	// 将鼠标指针位置转换为窗口坐标
		switch(wParam)
		{
		case VK_SPACE:
			TextOut (hdc, point.x, point.y, TEXT("hello left!"), 12);

		}
		ReleaseDC(hwnd, hdc);
		return 0;

	case WM_RBUTTONDOWN:
		hdc = GetDC(hwnd);

		x = LOWORD(lParam);
		y = HIWORD(lParam);
		TextOut (hdc, x, y, TEXT("hello right!"), 12);

		ReleaseDC(hwnd, hdc);
		return 0;

	case WM_PAINT:
		hdc = BeginPaint (hwnd, &ps) ;
		
		GetClientRect (hwnd, &rect) ;
		
		DrawText (hdc, TEXT ("Hello, Windows 98!"), -1, &rect,
			DT_SINGLELINE | DT_CENTER | DT_VCENTER) ;
		
		EndPaint (hwnd, &ps) ;
		return 0 ;
		
	case WM_DESTROY:
		UnLockHook();
		PostQuitMessage (0) ;		
		return 0 ;
	}
	return DefWindowProc (hwnd, message, wParam, lParam) ;
}

不知道为什么，鼠标右键点击一次，会产生很多的消息窗口？？