java键盘钩子_HOOK使用:全局键盘钩子

// CatchKey.cpp : Defines the entry point for the DLL application.

//

#define _WIN32_WINNT 0x0500 //设置系统版本，可以使用底层键盘钩子

#define WM_MY_SHORTS (WM_USER + 105)

#include “windows.h”

//全局变量

LPWORDg_lpdwVirtualKey = NULL; //Keycode 数组的指针

int g_nLength = 0; //Keycode 数组的大小

HINSTANCE g_hInstance = NULL; //模块实例句柄

HHOOK g_hHook = NULL; //钩子句柄

HWND g_hWnd = NULL;

BOOL APIENTRY DllMain(HANDLE hModule, DWORD ul_reason_for_call,LPVOID lpReserved)

{

//保存模块实例句柄

g_hInstance = (HINSTANCE)hModule;

//在进程结束或线程结束时卸载钩子

switch (ul_reason_for_call)

{

case DLL_PROCESS_ATTACH:

break;

case DLL_THREAD_ATTACH:

break;

case DLL_PROCESS_DETACH:

case DLL_THREAD_DETACH:

delete g_lpdwVirtualKey;

if (g_hHook != NULL) UnhookWindowsHookEx(g_hHook);

break;

}

return TRUE;

}

LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam,LPARAM lParam)

{

//判断是否是有效按键

if (nCode >= HC_ACTION && wParam==WM_KEYDOWN)

{

BOOL bctrl = GetAsyncKeyState(VK_CONTROL)>>((sizeof(SHORT) *8)-1);

KBDLLHOOKSTRUCT* pStruct = (KBDLLHOOKSTRUCT*)lParam;

LPWORD tmpVirtualKey = g_lpdwVirtualKey;

if (pStruct->vkCode == 80 && bctrl)

PostMessage(g_hWnd,WM_MY_SHORTS,0,1);

return TRUE;

}

//传给系统中的下一个钩子

return CallNextHookEx(g_hHook, nCode, wParam, lParam);

}

_declspec(dllexport)

BOOL WINAPI StartCatch(LPWORD lpdwVirtualKey, int nLength, HWND pWnd)

{

g_hWnd = pWnd;

//如果已经安装键盘钩子则返回 FALSE

if (g_hHook != NULL) return FALSE;

//将用户传来的 keycode 数组保存在全局变量中

g_lpdwVirtualKey = (LPWORD)malloc(sizeof(WORD) * nLength);

LPWORD tmpVirtualKey = g_lpdwVirtualKey;

for (int i = 0; i < nLength; i++)

{

*tmpVirtualKey++ = *lpdwVirtualKey++;

}

g_nLength = nLength;

//安装底层键盘钩子

g_hHook = SetWindowsHookEx(WH_KEYBOARD_LL, LowLevelKeyboardProc, g_hInstance, NULL);

if (g_hHook == NULL) return FALSE;

return TRUE;

}

_declspec(dllexport)

BOOL WINAPI StopCatch()

{ //卸载钩子

if (UnhookWindowsHookEx(g_hHook) == 0) return FALSE;

g_hHook = NULL;

return TRUE;

}

利用底层的键盘钩子

LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam,LPARAM lParam)来拦截 按键的时候

键盘的键按下和弹起时候会发生WM_KEYUP 和

WM_KEYDOWN两个消息，

这两个消息都会被hook，所以如此。

所以需要对 wParam 进行判断  是 WM_KEYDOWN 还是 WM_KEYUP