print.c

有关C语言的控制打印机的程序

/*-------------------------------------------------------------------
   PRINT.C -- Common routines for Print1, Print2, Print3, and Print4
  -------------------------------------------------------------------*/

#include <windows.h>

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

extern HINSTANCE hInst ;
extern char      szAppName[] ;
extern char      szCaption[] ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
     {
     HWND       hwnd ;
     MSG        msg ;
     WNDCLASSEX wndclass ;

     wndclass.cbSize        = sizeof (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 = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
     wndclass.lpszMenuName  = NULL ;
     wndclass.lpszClassName = szAppName ;
     wndclass.hIconSm       = LoadIcon (NULL, IDI_APPLICATION) ;

     RegisterClassEx (&wndclass) ;

     hInst = hInstance ;

     hwnd = CreateWindow (szAppName, szCaption,
                          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 ;
     }

HDC GetPrinterDC (void)
     {
     PRINTER_INFO_5 pinfo5[3] ; 
     DWORD          dwNeeded, dwReturned ;

     if (EnumPrinters (PRINTER_ENUM_DEFAULT, NULL, 5, (LPBYTE) pinfo5,
                       sizeof (pinfo5), &dwNeeded, &dwReturned))
          return CreateDC (NULL, pinfo5[0].pPrinterName, NULL, NULL) ;

     return 0 ;            // EnumPrinters failed, so return null hdc
     }

void PageGDICalls (HDC hdcPrn, int cxPage, int cyPage)
     {
     static char szTextStr[] = "Hello, Printer!" ;

     Rectangle (hdcPrn, 0, 0, cxPage, cyPage) ;

     MoveToEx (hdcPrn, 0, 0, NULL) ;
     LineTo   (hdcPrn, cxPage, cyPage) ;
     MoveToEx (hdcPrn, cxPage, 0, NULL) ;
     LineTo   (hdcPrn, 0, cyPage) ;

     SaveDC (hdcPrn) ;

     SetMapMode       (hdcPrn, MM_ISOTROPIC) ;
     SetWindowExtEx   (hdcPrn, 1000, 1000, NULL) ;
     SetViewportExtEx (hdcPrn, cxPage / 2, -cyPage / 2, NULL) ;
     SetViewportOrgEx (hdcPrn, cxPage / 2,  cyPage / 2, NULL) ;

     Ellipse (hdcPrn, -500, 500, 500, -500) ;

     SetTextAlign (hdcPrn, TA_BASELINE | TA_CENTER) ;

     TextOut (hdcPrn, 0, 0, szTextStr, sizeof (szTextStr) - 1) ;

     RestoreDC (hdcPrn, -1) ;
     }

LRESULT CALLBACK WndProc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
     {
     static int   cxClient, cyClient ;
     HDC          hdc ;
     HMENU        hMenu ;
     PAINTSTRUCT  ps ;

     switch (msg)
          {
          case WM_CREATE :
               hMenu = GetSystemMenu (hwnd, FALSE) ;
               AppendMenu (hMenu, MF_SEPARATOR, 0, NULL) ;
               AppendMenu (hMenu, 0, 1, "&Print") ;
               return 0 ;

          case WM_SIZE :
               cxClient = LOWORD (lParam) ;
               cyClient = HIWORD (lParam) ;
               return 0 ;

          case WM_SYSCOMMAND :
               if (wParam == 1)
                    {
                    if (PrintMyPage (hwnd))
                         MessageBox (hwnd, "Could not print page!",
                              szAppName, MB_OK | MB_ICONEXCLAMATION) ;
                    return 0 ;
                    }
               break ;

          case WM_PAINT :
               hdc = BeginPaint (hwnd, &ps) ;

               PageGDICalls (hdc, cxClient, cyClient) ;

               EndPaint (hwnd, &ps) ;
               return 0 ;

          case WM_DESTROY :
               PostQuitMessage (0) ;
               return 0 ;
          }
     return DefWindowProc (hwnd, msg, wParam, lParam) ;
     }