Prdemo: C/C++ Version

The C/C++ version of Prdemo sets up and displays a Print dialog box in its SelectPrinter() function. If a printer is selected, SelectPrinter() also passes its device context to fg_printdc().

/****************************************************************************\
*                                                                            *
*  Prdemo.c                                                                  *
*                                                                            *
*  This program shows how to print the contents of a virtual buffer.  It     *
*  first loads a 640x480 BMP file into a virtual buffer and displays it.     *
*  When the user clicks the Print selection on the top-level menu, a 6-inch  *
*  by 4-inch copy of the BMP image is sent to the selected printer.          *
*                                                                            *
\****************************************************************************/
#include 
#include "Prdemo.h"
#define vbWidth  640
#define vbHeight 480
LRESULT CALLBACK WindowProc(HWND,UINT,WPARAM,LPARAM);
int SelectPrinter(void);
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdParam, int iCmdShow)
{
   static char szAppName[] = "FGprdemo";
   HWND        hWnd;
   MSG         msg;
   WNDCLASSEX  wndclass;
   wndclass.cbSize        = sizeof(wndclass);
   wndclass.style         = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
   wndclass.lpfnWndProc   = WindowProc;
   wndclass.cbClsExtra    = 0;
   wndclass.cbWndExtra    = 0;
   wndclass.hInstance     = hInstance;
   wndclass.hIcon         = LoadIcon(NULL,IDI_APPLICATION);
   wndclass.hCursor       = LoadCursor (NULL,IDC_ARROW);
   wndclass.hbrBackground = NULL;
   wndclass.lpszMenuName  = szAppName;
   wndclass.lpszClassName = szAppName;
   wndclass.hIconSm       = LoadIcon(NULL,IDI_APPLICATION);
   RegisterClassEx(&wndclass);
   hWnd = CreateWindow(szAppName, // window class name
      "Printing Demo",         // window caption
      WS_OVERLAPPEDWINDOW,     // window style
      CW_USEDEFAULT,           // initial x position
      CW_USEDEFAULT,           // initial y position
      CW_USEDEFAULT,           // initial x size
      CW_USEDEFAULT,           // initial y size
      NULL,                    // parent window handle
      NULL,                    // window menu handle
      hInstance,               // program instance handle
      NULL);                   // creation parameters
   ShowWindow(hWnd,iCmdShow);
   UpdateWindow(hWnd);
   while (GetMessage(&msg,NULL,0,0))
   {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
   }
   return msg.wParam;
}
/****************************************************************************\
*                                                                            *
*  WindowProc()                                                              *
*                                                                            *
\****************************************************************************/
HCURSOR  hCursor;
HDC      hDC;
HPALETTE hPal;
int      hVB;
UINT     cxClient, cyClient;
LRESULT CALLBACK WindowProc(HWND hWnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
   PAINTSTRUCT ps;
   switch (iMsg)
   {
      case WM_CREATE:
         hDC = GetDC(hWnd);
         fg_setdc(hDC);
         hPal = fg_defpal();
         fg_realize(hPal);
         fg_vbinit();
         hVB = fg_vballoc(vbWidth,vbHeight);
         fg_vbopen(hVB);
         fg_vbcolors();
         fg_showbmp("PORCH.BMP",0);
         return 0;
      case WM_COMMAND:
         switch (wParam)
         {
            case IDM_Print:
               if (SelectPrinter() == 0) return 0;
               if (fg_printer(STARTDOC) == 0)
               {
                  hCursor = SetCursor(LoadCursor(NULL,IDC_WAIT));
                  ShowCursor(TRUE);
                  fg_vbprint(0,vbWidth-1,0,vbHeight-1,0,600,0,400,2);
                  fg_printer(NEWFRAME);
                  fg_printer(ENDDOC);
                  ShowCursor(FALSE);
                  SetCursor(hCursor);
                  return 0;
               }
               else
                  MessageBox(hWnd,"Printer setup failed","Error",MB_ICONSTOP|MB_OK);
               break;
            case IDM_Exit:
               DestroyWindow(hWnd);
               return 0;
         }
         break;
      case WM_PAINT:
         BeginPaint(hWnd,&ps);
         fg_vbscale(0,vbWidth-1,0,vbHeight-1,0,cxClient-1,0,cyClient-1);
         EndPaint(hWnd,&ps);
         return 0;
      case WM_SETFOCUS:
         fg_realize(hPal);
         InvalidateRect(hWnd,NULL,TRUE);
         return 0;
      case WM_SIZE:
         cxClient = LOWORD(lParam);
         cyClient = HIWORD(lParam);
         return 0;
      case WM_DESTROY:
         fg_vbclose();
         fg_vbfree(hVB);
         fg_vbfin();
         DeleteObject(hPal);
         ReleaseDC(hWnd,hDC);
         PostQuitMessage(0);
         return 0;
   }
   return DefWindowProc(hWnd,iMsg,wParam,lParam);
}
/****************************************************************************\
*                                                                            *
*  SelectPrinter()                                                           *
*                                                                            *
*  Display a dialog box for printer selection.                               *
*                                                                            *
\****************************************************************************/
int SelectPrinter()
{
   PRINTDLG pd;
   // fill in structure fields for Print dialog box
   memset(&pd,0,sizeof(PRINTDLG));
   pd.lStructSize = sizeof(PRINTDLG);
   pd.hwndOwner = GetActiveWindow();
   pd.Flags = PD_RETURNDC | PD_NOPAGENUMS | PD_NOSELECTION;
   pd.nCopies = 1;
   // if successful, make the selected printer the active printer
   if (PrintDlg(&pd))
   {
      fg_printdc(pd.hDC);
      return 1;
   }
   return 0;
}