Windows API 教程（七） hook 钩子监听

#include <windows.h>

 

HWND hgWnd;

HHOOK myhook;

 

/****************************************************************

  WH_KEYBOARD hook procedure

  鍵盤钩子处理过程

 ****************************************************************/

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

{  

    PKBDLLHOOKSTRUCT p = (PKBDLLHOOKSTRUCT)lParam;

    const char *info = NULL;

    char text[50], data[20];

 

    PAINTSTRUCT ps;

    HDC hdc;

 

    if (nCode >= 0)

    {

        if      (wParam == WM_KEYDOWN)      info = "普通按鍵抬起";

        else if (wParam == WM_KEYUP)        info = "普通按鍵按下";

        else if (wParam == WM_SYSKEYDOWN)   info = "系統按鍵抬起";

        else if (wParam == WM_SYSKEYUP)     info = "系統按鍵按下";

 

        ZeroMemory(text, sizeof(text));

        ZeroMemory(data, sizeof(data));

        wsprintf(text, "%s - 键盘码 [%04d], 扫描码 [%04d]  ", info, p->vkCode, p->scanCode);

        wsprintf(data, "按鍵目測為： %c  ", p->vkCode);

 

        hdc = GetDC(hgWnd);        

        TextOut(hdc, 10, 10, text, strlen(text));

        TextOut(hdc, 10, 30, data, strlen(data));

        ReleaseDC(hgWnd,hdc);

    }

     

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

}

 

// 5. 窗口过程处理

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)

{  

    hgWnd = hwnd;

 

    switch(msg)

    {

        case WM_CLOSE:

            DestroyWindow(hwnd);

        break;

        case WM_DESTROY:

            PostQuitMessage(0);

            break;

        default:

            return DefWindowProc(hwnd, msg, wParam, lParam);

    }

    return 0;

}

 

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,

    LPSTR lpCmdLine, int nCmdShow)

{

    WNDCLASSEX wc;  //

    HWND hwnd;

    MSG Msg;

    char text[30];

 

    const char szClassName[] = "myWindowClass";

 

    // 1. 设置注册窗口结构体

    wc.cbSize        = sizeof(WNDCLASSEX);              // 注册窗口结构体的大小

    wc.style         = 0;                               // 窗口的样式

    wc.lpfnWndProc   = WndProc;                         // 指向窗口处理过程的函数指针

    wc.cbClsExtra    = 0;                               // 指定紧跟在窗口类结构后的附加字节数

    wc.cbWndExtra    = 0;                               // 指定紧跟在窗口事例后的附加字节数