printer.c

C#一个实例源代码

/*-----------------------------------------------------------
   Printer.c
  -----------------------------------------------------------*/

#include <windows.h>
#include "resource.h"
LRESULT CALLBACK MainWndProc (HWND, UINT, WPARAM, LPARAM) ;
BOOL    PrintPage (HWND) ;

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

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     HWND     hwnd ;
     MSG      msg ;
     WNDCLASS wndclass ;
     
     wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
     wndclass.lpfnWndProc   = MainWndProc ;
     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  = szAppName ;
     wndclass.lpszClassName = szAppName ;
     
     if (!RegisterClass (&wndclass))
     {
          MessageBox (NULL, TEXT ("This program requires Windows NT!"),
                      szAppName, MB_ICONERROR) ;
          return 0 ;
     }
     
     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 ;
}

void Drawing(HDC hdc, int cx, int cy)
{
     
     Ellipse (hdc, 0, 0, cx, cy) ;
     
     MoveToEx (hdc, 0, cy/2, NULL) ;
     LineTo   (hdc, cx,cy/2 ) ;
     MoveToEx (hdc, cx/2, 0, NULL) ;
     LineTo   (hdc, cx/2, cy) ;
    
  
}

LRESULT CALLBACK MainWndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     static int   cxClient, cyClient ;
     HDC          hdc ;
     HMENU        hMenu ;
     PAINTSTRUCT  ps ;
     
     switch (message)
     {
          
     case WM_SIZE:
          cxClient = LOWORD (lParam) ;
          cyClient = HIWORD (lParam) ;
          return 0 ;
          
     case WM_COMMAND:
          if (wParam == IDM_PRINT)
          {
               if (!PrintPage (hwnd))
                    MessageBox (hwnd, TEXT ("Could not print page!"),
                                szAppName, MB_OK | MB_ICONEXCLAMATION) ;
               return 0 ;
          }
          break ;
          
     case WM_PAINT :
          hdc = BeginPaint (hwnd, &ps) ;
          
          Drawing (hdc, cxClient, cyClient) ;
          
          EndPaint (hwnd, &ps) ;
          return 0 ;
          
     case WM_DESTROY :
          PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}