Programming Windows程式开发设计指南->第五章 例子程序5

/*_############################################################################
  _##
  _##  Programming Windows程式开发设计指南->第五章 例子程序5
  _##  Author: xwlee                        
  _##  Time: 2007.06.19 
  _##  Chang'an University
  _##  Development condition: win2003 Server+VC6.0
  _##
  _##  程序5-4  WHATSIZE
  _##  WHATSIZE.C 文件
  _##  程序显示了以五种度量映射模式显示的窗口客户区的大小。
  _##  程序只是进行验证
  _## 
  _##
  _##    WHATSIZE.C -- What Size is the Window?
  _##     (c) Charles Petzold, 1998
  _##  
  _##########################################################################*/

#include <windows.h>

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

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,

             PSTR szCmdLine, int iCmdShow)

{

       static TCHAR szAppName[] = TEXT ("WhatSize") ;

       HWND           hwnd ;

       MSG             msg ;

       WNDCLASS  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 ;

 

       if (!RegisterClass (&wndclass))

       {

              MessageBox (NULL, TEXT ("This program requires Windows NT!"),

              szAppName, MB_ICONERROR) ;

              return 0 ;

       }

    

       hwnd = CreateWindow (szAppName, TEXT ("What Size is the Window?"),

                            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 Show (HWND hwnd, HDC hdc, int xText, int yText, int iMapMode,

               TCHAR * szMapMode)

{

       TCHAR szBuffer [60] ;

       RECT  rect ;

    

       SaveDC (hdc) ;

       SetMapMode (hdc, iMapMode) ;

       GetClientRect (hwnd, &rect) ;

       DPtoLP (hdc, (PPOINT) &rect, 2) ;

    

       RestoreDC (hdc, -1) ;

       TextOut (       hdc, xText, yText, szBuffer,

                   wsprintf (szBuffer, TEXT ("%-20s %7d %7d %7d %7d"), szMapMode,

                     rect.left, rect.right, rect.top, rect.bottom)) ;

} 

 

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)

{

       static TCHAR szHeading [] =

              TEXT ("Mapping Mode Left Right       Top  Bottom") ;

       static TCHAR szUndLine [] =

              TEXT ("------------   ----   -----       ---  ------") ;

       static int   cxChar, cyChar ;

       HDC             hdc ;

       PAINTSTRUCT     ps ;

       TEXTMETRIC      tm ;

    

       switch (message)

       {

       case WM_CREATE:

              hdc = GetDC (hwnd) ;

              SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ;

         

              GetTextMetrics (hdc, &tm) ;

              cxChar = tm.tmAveCharWidth ;

              cyChar = tm.tmHeight + tm.tmExternalLeading ;

         

              ReleaseDC (hwnd, hdc) ;

              return 0 ;

         

       case WM_PAINT:

              hdc = BeginPaint (hwnd, &ps) ;

              SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ; // 固定间距的字体

              SetMapMode (hdc, MM_ANISOTROPIC) ;

              SetWindowExtEx (hdc, 1, 1, NULL) ;

              SetViewportExtEx (hdc, cxChar, cyChar, NULL) ;

         

              TextOut (hdc, 1, 1, szHeading, lstrlen (szHeading)) ;

              TextOut (hdc, 1, 2, szUndLine, lstrlen (szUndLine)) ;

         

              Show (hwnd, hdc, 1, 3, MM_TEXT,   TEXT ("TEXT (pixels)")) ;

              Show (hwnd, hdc, 1, 4, MM_LOMETRIC,  TEXT ("LOMETRIC (.1 mm)")) ;

              Show (hwnd, hdc, 1, 5, MM_HIMETRIC,   TEXT ("HIMETRIC (.01 mm)")) ;

              Show (hwnd, hdc, 1, 6, MM_LOENGLISH, TEXT ("LOENGLISH (.01 in)")) ;

              Show (hwnd, hdc, 1, 7, MM_HIENGLISH,TEXT ("HIENGLISH (.001 in)")) ;

              Show (hwnd, hdc, 1, 8, MM_TWIPS, TEXT ("TWIPS (1/1440 in)")) ;

         

              EndPaint (hwnd, &ps) ;

              return 0 ;

         

       case WM_DESTROY:

              PostQuitMessage (0) ;

              return 0 ;

       }

       return DefWindowProc (hwnd, message, wParam, lParam) ;

}