键盘消息源代码

实现在窗口中显示按键信息 #include <windows.h> #include <stdio.h> //全局变量 RECT rc; //记录滚屏的矩形区域 int xChar, yChar; //文本输入点坐标 WNDCLASSEX wnd; //窗口类结构变量 char szAppName[] = "键盘消息监视程序"; //窗口类名 //函数声名 LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM); BOOL MyRegisterClass(HINSTANCE hInstance); BOOL InitInstance(HINSTANCE hInstance,int iCmdShow); //函数：WinMain //作用：入口函数 int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,LPSTR szCmdLine, int iCmdShow) { MSG msg; if(!MyRegisterClass(hInstance)) { return FALSE; } if(!InitInstance(hInstance,iCmdShow)) { return FALSE; } while (GetMessage (&msg, NULL, 0, 0)) { TranslateMessage (&msg); DispatchMessage (&msg); } return msg.wParam; } //函数：ShowKey //作用：实现在窗口中显示按键信息 void ShowKey (HWND hwnd, int iType, char *szMessage,WPARAM wParam, LPARAM lParam) { static char *szFormat[2] = { "%-14s %3d %c %6u %4d %5s %5s %6s %6s", "%-14s %3d %c %6u %4d %5s %5s %6s %6s" } ; char szBuffer[80]; HDC hdc; ScrollWindowEx(hwnd, 0, -yChar, &rc, &rc,NULL,NULL,SW_INVALIDATE); hdc = GetDC (hwnd); SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)); TextOut (hdc, xChar, rc.bottom - yChar, szBuffer, wsprintf (szBuffer, szFormat [iType], szMessage, //消息 wParam,//虚拟键代码 (BYTE) (iType ? wParam : ),//显示字符值 LOWORD (lParam),//重复次数 HIWORD (lParam) & 0xFF,//OEM键盘扫描码 //判断是否为增强键盘的扩展键 (PSTR) (0x01000000 & lParam ? "是" : "否"), //判断是否同时使用了ALT键 (PSTR) (0x20000000 & lParam ? "是" : "否"), (PSTR) (0x40000000 & lParam ? "按下" : "抬起"),//判断前一次击键状态 (PSTR) (0x80000000 & lParam ? "按下" : "抬起"))//判断转换状态 ); ReleaseDC (hwnd, hdc); ValidateRect (hwnd, NULL); } //函数：WndProc //作用：处理主窗口的消息 LRESULT CALLBACK WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam) { static char szTop[] = "消息 键 字符 重复数 扫描码 扩展码 ALT 前一状态 转换状态"; static char szUnd[] = "_______ __ ____ _____ ______ ______ ___ _______ ______"; //在窗口中输出文字作为信息标题 HDC hdc; PAINTSTRUCT ps; TEXTMETRIC tm; switch (iMsg) { case WM_CREATE://处理窗口创建的消息 hdc = GetDC (hwnd); //设定字体 SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)); //检取当前字体的度量数据 GetTextMetrics (hdc, &tm); xChar = tm.tmAveCharWidth;//保存字体平均宽度 yChar = tm.tmHeight;//保存字体高度 ReleaseDC (hwnd, hdc); rc.top = 3 * yChar / 2; return 0; case WM_SIZE://处理窗口大小改变的消息 //窗体改变后保存新的滚屏区域右下角坐标 rc.right = LOWORD (lParam); rc.bottom = HIWORD (lParam); UpdateWindow (hwnd); return 0; case WM_PAINT://处理窗口重绘消息 InvalidateRect (hwnd, NULL, TRUE); hdc = BeginPaint (hwnd, &ps); SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ; SetBkMode (hdc, TRANSPARENT) ; TextOut (hdc, xChar, yChar / 2, szTop, (sizeof szTop) - 1) ; TextOut (hdc, xChar, yChar / 2, szUnd, (sizeof szUnd) - 1) ; EndPaint (hwnd, &ps); return 0; case WM_KEYDOWN://处理键盘上某一键按下的消息 ShowKey (hwnd, 0, "WM_KEYDOWN", wParam, lParam); return 0; case WM_KEYUP://处理键盘上某一按下键被释放的消息 ShowKey (hwnd, 0, "WM_KEYUP", wParam, lParam); return 0; case WM_CHAR://处理击键过程中产生的非系统键的可见字符消息 ShowKey (hwnd, 1, "WM_CHAR", wParam, lParam); return 0; case WM_DEADCHAR://处理击键过程中产生的非系统键"死字符"消息 ShowKey (hwnd, 1, "WM_DEADCHAR", wParam, lParam); return 0; case WM_SYSKEYDOWN://处理系统键按下的消息 ShowKey (hwnd, 0, "WM_SYSKEYDOWN", wParam, lParam); break; case WM_SYSKEYUP://处理系统键抬起的消息 ShowKey (hwnd, 0, "WM_SYSKEYUP", wParam, lParam); break; case WM_SYSCHAR://处理系统键可见字符消息 ShowKey (hwnd, 1, "WM_SYSCHAR", wParam, lParam); break; case WM_SYSDEADCHAR://处理系统键"死字符"消息 ShowKey (hwnd, 1, "WM_SYSDEADCHAR", wParam, lParam); break; case WM_DESTROY://处理结束应用程序的消息 PostQuitMessage (0); return 0; } return DefWindowProc (hwnd, iMsg, wParam, lParam); } //函数：MyRegisterClass //作用：注册窗口类 BOOL MyRegisterClass(HINSTANCE hInstance) { wnd.cbSize= sizeof (wnd); wnd.style = CS_HREDRAW | CS_VREDRAW; wnd.lpfnWndProc = WndProc; wnd.cbClsExtra = 0; wnd.cbWndExtra = 0; wnd.hInstance = hInstance; wnd.hIcon = LoadIcon (NULL, IDI_APPLICATION); wnd.hCursor = LoadCursor (NULL, IDC_ARROW); wnd.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH); wnd.lpszMenuName = NULL; wnd.lpszClassName = szAppName; wnd.hIconSm = LoadIcon (NULL, IDI_APPLICATION); return RegisterClassEx (&wnd); } //函数：InitInstance //作用：创建主窗口 BOOL InitInstance(HINSTANCE hInstance,int iCmdShow) { HWND hwnd; hwnd = CreateWindow (szAppName, "键盘消息监视程序", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT,CW_USEDEFAULT, CW_USEDEFAULT,CW_USEDEFAULT, NULL,NULL,hInstance,NULL ); if(!hwnd) { return FALSE; } ShowWindow (hwnd, iCmdShow); UpdateWindow (hwnd); return TRUE; }