demo2_2.c

WINDOWS图形编程随书光盘

  1 /****************************************************************/
  2 /*         Demo2_2   ---  The Use of SaveDC                     */
  3 /****************************************************************/
  4 
  5 #include <windows.h>
  6 #include "demo2_2.h"
  7 
  8 int  PASCAL  WinMain(HANDLE, HANDLE, LPSTR, int);
  9 long FAR PASCAL MainWndProc(HWND, unsigned, WORD, LONG);
 10 
 11 void ShowFont(HDC, int, int, int);
 12 
 13 
 14 /****************************************************************/
 15 /*                      WinMain()                               */
 16 /****************************************************************/
 17 
 18 int PASCAL WinMain(HANDLE hInstance, HANDLE hPrevInstance,
 19                    LPSTR lpszCmdLine, int nCmdShow)
 20 {
 21    WNDCLASS wclass;
 22    MSG      msg;
 23    HWND     hWnd;
 24    char     szName[] = "Demo2_2";
 25 
 26    if (!hPrevInstance)
 27     {
 28         wclass.style         = NULL;
 29         wclass.lpfnWndProc   = MainWndProc;
 30         wclass.cbClsExtra    = 0;
 31         wclass.cbWndExtra    = 0;
 32         wclass.hInstance     = hInstance;
 33         wclass.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
 34         wclass.hCursor       = LoadCursor(NULL, IDC_ARROW);
 35         wclass.hbrBackground = GetStockObject(WHITE_BRUSH);
 36         wclass.lpszMenuName  = szName;
 37         wclass.lpszClassName = szName;
 38 
 39         if (!RegisterClass (&wclass))
 40            return (FALSE);
 41     }
 42 
 43     hWnd = CreateWindow(
 44                 szName,
 45                 "The SaveDC" ,
 46                 WS_OVERLAPPEDWINDOW,
 47                 CW_USEDEFAULT,
 48                 CW_USEDEFAULT,
 49                 CW_USEDEFAULT,
 50                 CW_USEDEFAULT,
 51                 NULL,
 52                 NULL,
 53                 hInstance,
 54                 NULL );
 55 
 56     if (!hWnd)
 57         return (FALSE);
 58 
 59     ShowWindow(hWnd, nCmdShow);
 60     UpdateWindow(hWnd);
 61 
 62     while (GetMessage(&msg, NULL, NULL,NULL))
 63        {
 64            TranslateMessage(&msg);
 65            DispatchMessage(&msg);
 66        }
 67     return (msg.wParam);
 68 }
 69 
 70 
 71 
 72 /****************************************************************/
 73 /*                      MainWndProc()                           */
 74 /****************************************************************/
 75 
 76 long FAR PASCAL MainWndProc(HWND hWnd, unsigned message,
 77                             WORD wParam, LONG lParam)
 78 {
 79    HDC           hDC;
 80    PAINTSTRUCT   ps;
 81    TEXTMETRIC    tm;
 82    HFONT         hFont;
 83    char          szString[50];
 84 
 85    switch (message)
 86     {
 87       case WM_COMMAND :
 88                 switch (wParam)
 89                   {
 90                     case IDM_EXIT :
 91                          DestroyWindow(hWnd);
 92                          break;
 93                   }
 94                 return (0);
 95 
 96       case WM_PAINT :
 97                 hDC = BeginPaint(hWnd, &ps);
 98 
 99                 hFont = GetStockObject(SYSTEM_FIXED_FONT);
100                 SelectObject(hDC, hFont);
101 
102 
103                 sprintf(szString, "This is the No.1 font :");
104                 TextOut(hDC, 10, 10, szString,
105                                      strlen(szString));
106                 ShowFont(hDC, 10, 30, ANSI_FIXED_FONT);
107 
108 
109                 sprintf(szString, "This is the No.2 font :");
110                 TextOut(hDC, 10, 100, szString,
111                                      strlen(szString));
112                 ShowFont(hDC, 10, 120, ANSI_VAR_FONT);
113 
114 
115                 sprintf(szString, "End of the show");
116                 TextOut(hDC, 10, 190, szString,
117                                      strlen(szString));
118 
119                 EndPaint(hWnd, &ps);
120                 return (0);
121 
122       case WM_DESTROY :
123                 PostQuitMessage(0);
124                 return (0);
125 
126       default :
127                 return(DefWindowProc(hWnd, message, wParam, lParam));
128     }
129 }
130 
131 
132 void ShowFont(HDC hDC, int x, int y, int nIndex)
133 {
134    HFONT  hFont;
135    char   szString[20];
136 
137    SaveDC(hDC);
138 
139    switch (nIndex)
140      {
141        case ANSI_FIXED_FONT :
142 
143                 hFont = GetStockObject(nIndex);
144                 SelectObject(hDC, hFont);
145 
146                 sprintf(szString, " ANSI_FIXED_FONT :");
147                 TextOut(hDC, x, y, szString,
148                                      strlen(szString));
149                 TextOut(hDC, x, y+20, "   abcdefghijklm", 13);
150 
151                 break;
152 
153        case ANSI_VAR_FONT:
154 
155                 hFont = GetStockObject(nIndex);
156                 SelectObject(hDC, hFont);
157 
158                 sprintf(szString, " ANSI_VAR_FONT :");
159                 TextOut(hDC, x, y, szString,
160                                      strlen(szString));
161                 TextOut(hDC, x, y+20, "   abcdefghijklm", 13);
162 
163                 break;
164       }
165 
166    RestoreDC(hDC, -1);
167 }