keymouse.c

C#一个实例源代码

/*----------------------------------------
KeyMouse.c
----------------------------------------*/
#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     static TCHAR szAppName[] = TEXT ("KeyMouse") ;
     HWND         hwnd ;
     MSG          msg ;
     WNDCLASS     wndclass ;

     wndclass.style         = CS_HREDRAW | CS_VREDRAW|CS_DBLCLKS;
     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  = szAppName;
     wndclass.lpszClassName = szAppName ;

     if (!RegisterClass (&wndclass))
     {
          MessageBox (NULL, TEXT ("This program requires Windows NT!"), 
                      szAppName, MB_ICONERROR) ;
          return 0 ;
     }
     
     hwnd = CreateWindow (szAppName,                
                          TEXT ("KeyMouse Demo"), 
                          WS_OVERLAPPEDWINDOW,     
                          CW_USEDEFAULT,             
                          CW_USEDEFAULT,             
                          CW_USEDEFAULT,             
                          CW_USEDEFAULT,            
                          NULL,                  
                          NULL,                      
                          hInstance,                
                          NULL) ; 
	
     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)
{   
 
   POINT pt;                  // cursor location  
   RECT rc;                   // client area coordinates 
   static int repeat = 1;     // repeat key counter 
 
 
   switch (message)
   { 
    
    case WM_KEYDOWN: 
 
        if (wParam != VK_LEFT && wParam != VK_RIGHT && 
        wParam != VK_UP && wParam != VK_DOWN) 
        { 
            break; 
        } 
 
        GetCursorPos(&pt); 
 
        // Convert screen coordinates to client coordinates. 
 
        ScreenToClient(hwnd, &pt); 
 
        switch (wParam) 
        { 
        // Move the cursor to reflect which 
        // arrow keys are pressed. 
 
            case VK_LEFT:               // left arrow 
                pt.x -= repeat; 
                break; 
 
            case VK_RIGHT:              // right arrow 
                pt.x += repeat; 
                break; 
 
            case VK_UP:                 // up arrow 
                pt.y -= repeat; 
                break; 
 
            case VK_DOWN:               // down arrow 
                pt.y += repeat; 
                break; 
 
            default: 
                return 0; 
 
        } 
 
        repeat++;           // Increment repeat count. 
 
        // Keep the cursor in the client area. 
 
        GetClientRect(hwnd, &rc); 
 
        if (pt.x >= rc.right) 
        { 
            pt.x = rc.right - 1; 
        } 
        else 
        { 
            if (pt.x < rc.left) 
            { 
                pt.x = rc.left; 
            } 
        } 
 
        if (pt.y >= rc.bottom) 
            pt.y = rc.bottom - 1; 
        else 
            if (pt.y < rc.top) 
                pt.y = rc.top; 
 
        // Convert client coordinates to screen coordinates. 
 
        ClientToScreen(hwnd, &pt); 
        SetCursorPos(pt.x, pt.y); 
        break; 
 
    case WM_KEYUP: 
 
        repeat = 1;            // Clear repeat count. 
        break;

	case WM_DESTROY:
        PostQuitMessage (0) ;
        return 0 ;
   }
   return DefWindowProc (hwnd, message, wParam, lParam) ;
}