windows程序设计之BitBlt的问题

2015-01-04 08:44:46 178 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

windows程序设计篇——插入位图单刀直入，不废话了。插入位图的一般步骤： ①首先在资源位插入位图，ID为IDB_BITMAP1，而且要在主程序中包含进新加入的头文件，即resource.h否则，编译器无法找到相应的位图资源。剩下的这些都是在WM_PAINT这个环节中完成的： ②新建一个位图句柄：hBitMap=LoadBitMap(GetModule 阅读详情

这是windows程序设计第14章的第一个程序，目的是将图标重复拷贝到客户区，以下是源码（书中自带）



/*---------------------------------------

   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_CXSMICON) ;



          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) ;

}