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？？
