emf.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

/*--------------------------------------------------------
   EMF.C -- Enhanced Metafile Demonstration Shell Program
            (c) Charles Petzold, 1998
  --------------------------------------------------------*/

#include <windows.h>
#include <commdlg.h>
#include "..\\emf8\\resource.h"

extern void CreateRoutine (HWND) ;
extern void PaintRoutine  (HWND, HDC, int, int) ;

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

HANDLE hInst ;

extern TCHAR szClass [] ;
extern TCHAR szTitle [] ;

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

     hInst = hInstance ;

     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  = szResource ;
     wndclass.lpszClassName = szClass ;
     
     if (!RegisterClass (&wndclass))
     {
          MessageBox (NULL, TEXT ("This program requires Windows NT!"),
                      szClass, MB_ICONERROR) ;
          return 0 ;
     }
     
     hwnd = CreateWindow (szClass, szTitle,
                          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 ;
}

BOOL PrintRoutine (HWND hwnd)
{
     static DOCINFO  di ;
     static PRINTDLG printdlg = { sizeof (PRINTDLG) } ;
     static TCHAR    szMessage [32] ;
     BOOL            bSuccess = FALSE ;
     HDC             hdcPrn ;
     int             cxPage, cyPage ;

	printdlg.Flags = PD_RETURNDC | PD_NOPAGENUMS | PD_NOSELECTION ;

	if (!PrintDlg (&printdlg))
          return TRUE ;

     if (NULL == (hdcPrn = printdlg.hDC))
          return FALSE ;

     cxPage = GetDeviceCaps (hdcPrn, HORZRES) ;
     cyPage = GetDeviceCaps (hdcPrn, VERTRES) ;

     lstrcpy (szMessage, szClass) ;
     lstrcat (szMessage, TEXT (": Printing")) ;

     di.cbSize      = sizeof (DOCINFO) ;
     di.lpszDocName = szMessage ;

     if (StartDoc (hdcPrn, &di) > 0)
     {
          if (StartPage (hdcPrn) > 0)
          {
               PaintRoutine (hwnd, hdcPrn, cxPage, cyPage) ;

               if (EndPage (hdcPrn) > 0)
               {
                    EndDoc (hdcPrn) ;
                    bSuccess = TRUE ;
               }
          }
     }
     DeleteDC (hdcPrn) ;

     return bSuccess ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     BOOL        bSuccess ;
     static int  cxClient, cyClient ;
     HDC         hdc ;
     PAINTSTRUCT ps ;
     
     switch (message)
     {
     case WM_CREATE:
          CreateRoutine (hwnd) ;
          return 0 ;
          
     case WM_COMMAND:
          switch (wParam)
          {
          case IDM_PRINT:
               SetCursor (LoadCursor (NULL, IDC_WAIT)) ;
               ShowCursor (TRUE) ;
               
               bSuccess = PrintRoutine (hwnd) ;
               
               ShowCursor (FALSE) ;
               SetCursor (LoadCursor (NULL, IDC_ARROW)) ;
               
               if (!bSuccess)
                    MessageBox (hwnd,
                                TEXT ("Error encountered during printing"),
                                szClass, MB_ICONASTERISK | MB_OK) ;
               return 0 ;
               
          case IDM_EXIT:
               SendMessage (hwnd, WM_CLOSE, 0, 0) ;
               return 0 ;
               
          case IDM_ABOUT:
               MessageBox (hwnd, TEXT ("Enhanced Metafile Demo Program\n")
                                 TEXT ("Copyright (c) Charles Petzold, 1998"),
                           szClass, MB_ICONINFORMATION | MB_OK) ;
               return 0 ;
          }
          break ;
          
     case WM_SIZE:
          cxClient = LOWORD (lParam) ;
          cyClient = HIWORD (lParam) ;
          return 0 ;
          
     case WM_PAINT:
          hdc = BeginPaint (hwnd, &ps) ;
          
          PaintRoutine (hwnd, hdc, cxClient, cyClient) ;
          
          EndPaint (hwnd, &ps) ;
          return 0 ;
          
     case WM_DESTROY :
          PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}