emf3.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

/*-------------------------------------
   EMF3.C -- Enhanced Metafile Demo #3
             (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 ("EMF3") ;
     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_APPLICATION) ;
     wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
     wndclass.hbrBackground = 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 ("Enhanced Metafile Demo #3"),
                          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)
{
     LOGBRUSH     lb ;
     HDC          hdc, hdcEMF ;
     HENHMETAFILE hemf ;
     PAINTSTRUCT  ps ;
     RECT         rect ;
     
     switch (message)
     {
     case WM_CREATE:
          hdcEMF = CreateEnhMetaFile (NULL, TEXT ("emf3.emf"), NULL,
                                      TEXT ("EMF3\0EMF Demo #3\0")) ;
          
          SelectObject (hdcEMF, CreateSolidBrush (RGB (0, 0, 255))) ;
          
          lb.lbStyle = BS_SOLID ;
          lb.lbColor = RGB (255, 0, 0) ;
          lb.lbHatch = 0 ;

          SelectObject (hdcEMF, 
               ExtCreatePen (PS_SOLID | PS_GEOMETRIC, 5, &lb, 0, NULL)) ;
 
          if (GetVersion () & 0x80000000)                   // Windows 98
               Rectangle (hdcEMF, 100, 100, 201, 201) ;
          else                                              // Windows NT
               Rectangle (hdcEMF, 101, 101, 202, 202) ;
                    
          MoveToEx  (hdcEMF, 100, 100, NULL) ;
          LineTo    (hdcEMF, 200, 200) ;
          
          MoveToEx  (hdcEMF, 200, 100, NULL) ;
          LineTo    (hdcEMF, 100, 200) ;
          
          DeleteObject (SelectObject (hdcEMF, GetStockObject (BLACK_PEN))) ;
          DeleteObject (SelectObject (hdcEMF, GetStockObject (WHITE_BRUSH))) ;
          
          hemf = CloseEnhMetaFile (hdcEMF) ;
          
          DeleteEnhMetaFile (hemf) ;
          return 0 ;
          
     case WM_PAINT:
          hdc = BeginPaint (hwnd, &ps) ;
          
          GetClientRect (hwnd, &rect) ;
          
          rect.left   =     rect.right  / 4 ;
          rect.right  = 3 * rect.right  / 4 ;
          rect.top    =     rect.bottom / 4 ;
          rect.bottom = 3 * rect.bottom / 4 ;
          
          hemf = GetEnhMetaFile (TEXT ("emf3.emf")) ;
          
          PlayEnhMetaFile (hdc, hemf, &rect) ;
          DeleteEnhMetaFile (hemf) ;
          EndPaint (hwnd, &ps) ;
          return 0 ;
          
     case WM_DESTROY:
          PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}