pntproc.c

C#一个实例源代码

/*---------------------------------------
   PntProc.c
  ---------------------------------------*/

#include <windows.h>

HDC  GetPntDC (void) ;                 // in GetPntDC.c
void Drawing (HDC, int, int) ;          // in Printer.C

HINSTANCE hInst ;
TCHAR     szAppName[] = TEXT ("Printer") ;
TCHAR     szCaption[] = TEXT ("Printer") ;

BOOL bUserAbort ;
HWND hDlgPrint ;

BOOL CALLBACK PrintDlgProc (HWND hDlg, UINT message, 
                            WPARAM wParam, LPARAM lParam)
{
     switch (message)
     {
     case WM_INITDIALOG:
          SetWindowText (hDlg, szAppName) ;
          EnableMenuItem (GetSystemMenu (hDlg, FALSE), SC_CLOSE, MF_GRAYED) ;
          return TRUE ;
          
     case WM_COMMAND:
          bUserAbort = TRUE ;
          EnableWindow (GetParent (hDlg), TRUE) ;
          DestroyWindow (hDlg) ;
          hDlgPrint = NULL ;
          return TRUE ;
     }
     return FALSE ;
}

BOOL CALLBACK AbortProc (HDC hdcPrn, int iCode)
{
     MSG msg ;
     
     while (!bUserAbort && PeekMessage (&msg, NULL, 0, 0, PM_REMOVE))
     {
          if (!hDlgPrint || !IsDialogMessage (hDlgPrint, &msg))
          {
               TranslateMessage (&msg) ;
               DispatchMessage (&msg) ;
          }
     }
     return !bUserAbort ;
}

BOOL PrintPage (HWND hwnd)
{
     static DOCINFO di = { sizeof (DOCINFO), TEXT ("Printing") } ;
     BOOL           bSuccess = TRUE ;
     HDC            hdcPrn ;
     int            xPage, yPage ;
     
     if (NULL == (hdcPrn = GetPntDC ()))
          return FALSE ;
     
     xPage = GetDeviceCaps (hdcPrn, HORZRES) ;
     yPage = GetDeviceCaps (hdcPrn, VERTRES) ;
     
     EnableWindow (hwnd, FALSE) ;
     
     bUserAbort = FALSE ;
     hDlgPrint = CreateDialog (hInst, TEXT ("PntDlgBox"), 
                               hwnd, PrintDlgProc) ;
     
     SetAbortProc (hdcPrn, AbortProc) ;
     
     if (StartDoc (hdcPrn, &di) > 0)
     {
          if (StartPage (hdcPrn) > 0)
          {
               Drawing (hdcPrn, xPage, yPage) ;
               
               if (EndPage (hdcPrn) > 0)
                    EndDoc (hdcPrn) ;
               else
                    bSuccess = FALSE ;
          }
     }
     else
          bSuccess = FALSE ;

     if (!bUserAbort)
     {
          EnableWindow (hwnd, TRUE) ;
          DestroyWindow (hDlgPrint) ;
     }
     
     DeleteDC (hdcPrn) ;
     
     return bSuccess && !bUserAbort ;
}