emf1.c

Windows Programming source code

/*-------------------------------------
   EMF1.C -- Enhanced Metafile Demo #1
             (c) Charles Petzold, 1998
  -------------------------------------*/

#include <windows.h>

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

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    LPSTR lpszCmdLine, int nCmdShow)
{
     static TCHAR szAppName[] = TEXT ("EMF1") ;
     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 #1"),
                          WS_OVERLAPPEDWINDOW,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          NULL, NULL, hInstance, NULL) ;
     
     ShowWindow (hwnd, nCmdShow) ;
     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 HENHMETAFILE hemf ;
     HDC                 hdc, hdcEMF ;
     PAINTSTRUCT         ps ;
     RECT                rect ;
     
     switch (message)
     {
     case WM_CREATE:
          hdcEMF = CreateEnhMetaFile (NULL, NULL, NULL, NULL) ;

          Rectangle (hdcEMF, 100, 100, 200, 200) ;
          
          MoveToEx  (hdcEMF, 100, 100, NULL) ;
          LineTo    (hdcEMF, 200, 200) ;
          
          MoveToEx  (hdcEMF, 200, 100, NULL) ;
          LineTo    (hdcEMF, 100, 200) ;

          hemf = CloseEnhMetaFile (hdcEMF) ;
          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 ;
          
          PlayEnhMetaFile (hdc, hemf, &rect) ;
          
          EndPaint (hwnd, &ps) ;
          return 0 ;
          
     case WM_DESTROY:
          DeleteEnhMetaFile (hemf) ;
          
          PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}