GDI/图象编程

开发平台：
Visual C++

DEMO5_2.C：源码内容
							  1 /****************************************************************/
  2 /*         Demo5_2   ---  Bitmap Demo                           */
  3 /****************************************************************/
  4 
  5 #include <windows.h>
  6 #include "Demo5_2.h"
  7 
  8 int  PASCAL  WinMain(HANDLE, HANDLE, LPSTR, int);
  9 long FAR PASCAL MainWndProc(HWND, unsigned, WORD, LONG);
 10 
 11 void DrawBitmap(HDC, POINT);
 12 
 13 
 14 HANDLE  hInst;
 15 int     TypeID = -1;
 16 
 17 /****************************************************************/
 18 /*                      WinMain()                               */
 19 /****************************************************************/
 20 
 21 int PASCAL WinMain(HANDLE hInstance, HANDLE hPrevInstance,
 22                    LPSTR lpszCmdLine, int nCmdShow)
 23 {
 24    WNDCLASS wclass;
 25    MSG      msg;
 26    HWND     hWnd;
 27    char     szName[] = "Demo5_2";
 28 
 29    if (!hPrevInstance)
 30     {
 31         wclass.style         = CS_HREDRAW | CS_VREDRAW;
 32         wclass.lpfnWndProc   = MainWndProc;
 33         wclass.cbClsExtra    = 0;
 34         wclass.cbWndExtra    = 0;
 35         wclass.hInstance     = hInstance;
 36         wclass.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
 37         wclass.hCursor       = LoadCursor(NULL, IDC_ARROW);
 38         wclass.hbrBackground = GetStockObject(WHITE_BRUSH);
 39         wclass.lpszMenuName  = szName;
 40         wclass.lpszClassName = szName;
 41 
 42         if (!RegisterClass (&wclass))
 43            return (FALSE);
 44     }
 45 
 46     hWnd = CreateWindow(
 47                 szName,
 48                 "Bitmap Demo" ,
 49                 WS_OVERLAPPEDWINDOW,
 50                 CW_USEDEFAULT,
 51                 CW_USEDEFAULT,
 52                 CW_USEDEFAULT,
 53                 CW_USEDEFAULT,
 54                 NULL,
 55                 NULL,
 56                 hInstance,
 57                 NULL );
 58 
 59     if (!hWnd)
 60         return (FALSE);
 61 
 62     hInst = hInstance;
 63 
 64     ShowWindow(hWnd, nCmdShow);
 65     UpdateWindow(hWnd);
 66 
 67     while (GetMessage(&msg, NULL, NULL,NULL))
 68        {
 69            TranslateMessage(&msg);
 70            DispatchMessage(&msg);
 71        }
 72     return (msg.wParam);
 73 }
 74 
 75 
 76 
 77 /****************************************************************/
 78 /*                      MainWndProc()                           */
 79 /****************************************************************/
 80 
 81 long FAR PASCAL MainWndProc(HWND hWnd, unsigned message,
 82                             WORD wParam, LONG lParam)
 83 {
 84    HMENU        hMenu;
 85    HDC          hDC;
 86    PAINTSTRUCT  ps;
 87    POINT        ptSize;
 88 
 89    switch (message)
 90     {
 91       case WM_COMMAND :
 92                 switch (wParam)
 93                   {
 94                     case IDM_FILE :
 95                     case IDM_ARR :
 96 
 97                          hMenu = GetMenu(hWnd);
 98                          if (TypeID == wParam)
 99                             break;
100 
101                          CheckMenuItem(hMenu, TypeID,
102                                         MF_UNCHECKED);
103                          TypeID = wParam;
104                          CheckMenuItem(hMenu, TypeID,
105                                         MF_CHECKED);
106 
107                          InvalidateRect(hWnd, NULL, TRUE);
108                          break;
109                   }
110                 return (0);
111 
112       case WM_SIZE :
113                 ptSize = MAKEPOINT(lParam);
114                 return (0);
115 
116       case WM_PAINT :
117                 hDC = BeginPaint(hWnd, &ps);
118 
119                 DrawBitmap(hDC, ptSize);
120 
121                 EndPaint(hWnd, &ps);
122                 return (0);
123 
124       case WM_DESTROY :
125                 PostQuitMessage(0);
126                 return (0);
127     }
128 
129   return(DefWindowProc(hWnd, message, wParam, lParam));
130 }
131 
132 
133 void DrawBitmap(HDC hDC, POINT ptSize)
134 {
135   HBITMAP  hBitmap;
136   HBRUSH   hBrush;
137   BITMAP   Bmp;
138   HDC      hMemDC;
139   WORD     Pat[] = {
140                      0xF8, 0x74, 0x22, 0x47,
141                      0x8F, 0x17, 0x22, 0x71
142                    };
143 
144   switch (TypeID)
145    {
146      case IDM_FILE :
147                 hBitmap = LoadBitmap(hInst, "Paper");
148                 hMemDC = CreateCompatibleDC(hDC);
149 
150                 SelectObject(hMemDC, hBitmap);
151                 GetObject(hBitmap, sizeof(BITMAP),
152                           (LPSTR) &Bmp);
153                 BitBlt(hDC, 0, 0,
154                        Bmp.bmWidth, Bmp.bmHeight,
155                        hMemDC, 0, 0,
156                        SRCCOPY);
157 
158                 DeleteDC(hMemDC);
159                 DeleteObject(hBitmap);
160                 break;
161 
162      case IDM_ARR :
163                 hBitmap = CreateBitmap(8, 8, 1, 1,
164                                        (LPSTR) Pat);
165                 hBrush = CreatePatternBrush(hBitmap);
166 
167                 hBrush = SelectObject(hDC, hBrush);
168                 PatBlt(hDC, 0, 0, ptSize.x, ptSize.y,
169                        PATCOPY);
170                 hBrush = SelectObject(hDC, hBrush);
171 
172                 DeleteObject(hBrush);
173                 DeleteObject(hBitmap);
174                 break;
175    }
176 }

						