bitblt.c

《Windows程序设计》配套代码、LZW压缩算法源代码、Socket异步通信示程序代码

/*---------------------------------------
   BITBLT.C -- BitBlt Demonstration
               (c) Charles Petzold, 1998
  ---------------------------------------*/

#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 ("BitBlt") ;
     HWND         hwnd ;
     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_INFORMATION) ;
     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, TEXT ("BitBlt 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)
{
     static int  cxClient, cyClient, cxSource, cySource ;
     HDC         hdcClient, hdcWindow ;
     int         x, y ;
     PAINTSTRUCT ps ;
     
     switch (message)
     {
     case WM_CREATE:
          cxSource = GetSystemMetrics (SM_CXSIZEFRAME) +
                     GetSystemMetrics (SM_CXSIZE) ;

          cySource = GetSystemMetrics (SM_CYSIZEFRAME) + 
                     GetSystemMetrics (SM_CYCAPTION) ;
          return 0 ;

     case WM_SIZE:
          cxClient = LOWORD (lParam) ;
          cyClient = HIWORD (lParam) ;
          return 0 ;

     case WM_PAINT:
          hdcClient = BeginPaint (hwnd, &ps) ;
          hdcWindow = GetWindowDC (hwnd) ;

          for (y = 0 ; y < cyClient ; y += cySource)
          for (x = 0 ; x < cxClient ; x += cxSource)
          {
               BitBlt (hdcClient, x, y, cxSource, cySource,
                       hdcWindow, 0, 0, SRCCOPY) ;
          }

          ReleaseDC (hwnd, hdcWindow) ;
          EndPaint (hwnd, &ps) ;
          return 0 ;

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