GDI/图象编程

开发平台：
Visual C++

DEMO8_2.C：源码内容
							  1 /****************************************************************/
  2 /*         Demo8_2   ---  Abort Procedure                       */
  3 /****************************************************************/
  4 
  5 #include <windows.h>
  6 #include "demo8_2.h"
  7 
  8 
  9 int  PASCAL  WinMain(HANDLE, HANDLE, LPSTR, int);
 10 long FAR PASCAL MainWndProc(HWND, unsigned, WORD, LONG);
 11 
 12 BOOL FAR PASCAL AbortProc(HWND, short);
 13 BOOL FAR PASCAL PrnDlgProc(HWND, WORD, WORD, LONG);
 14 
 15 void DrawGraph(HDC, BOOL);
 16 void DrawPencil(HDC);
 17 void DrawLine(HDC, BOOL);
 18 
 19 void PrintGraph(HWND);
 20 
 21 
 22 FARPROC lpAbortProc;
 23 FARPROC lpPrnDlgProc;
 24 
 25 int   ToolID = IDM_PENCIL;
 26 POINT OrgPoint;
 27 POINT PrePoint;
 28 POINT CurPoint;
 29 
 30 int CX, CY;
 31 
 32 HANDLE hInst;
 33 BOOL   bCancel;
 34 HWND   hPrnDlg;
 35 
 36 
 37 /****************************************************************/
 38 /*                      WinMain()                               */
 39 /****************************************************************/
 40 
 41 int PASCAL WinMain(HANDLE hInstance, HANDLE hPrevInstance,
 42                    LPSTR lpszCmdLine, int nCmdShow)
 43 {
 44    WNDCLASS wclass;
 45    MSG      msg;
 46    HWND     hWnd;
 47    char     szName[] = "Demo8_2";
 48 
 49    if (!hPrevInstance)
 50     {
 51         wclass.style         = CS_HREDRAW | CS_VREDRAW;
 52         wclass.lpfnWndProc   = MainWndProc;
 53         wclass.cbClsExtra    = 0;
 54         wclass.cbWndExtra    = 0;
 55         wclass.hInstance     = hInstance;
 56         wclass.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
 57         wclass.hCursor       = LoadCursor(NULL, IDC_ARROW);
 58         wclass.hbrBackground = GetStockObject(WHITE_BRUSH);
 59         wclass.lpszMenuName  = szName;
 60         wclass.lpszClassName = szName;
 61 
 62         if (!RegisterClass (&wclass))
 63            return (FALSE);
 64     }
 65 
 66     hWnd = CreateWindow(
 67                 szName,
 68                 "Abort Procedure" ,
 69                 WS_OVERLAPPEDWINDOW,
 70                 CW_USEDEFAULT,
 71                 CW_USEDEFAULT,
 72                 CW_USEDEFAULT,
 73                 CW_USEDEFAULT,
 74                 NULL,
 75                 NULL,
 76                 hInstance,
 77                 NULL );
 78 
 79     if (!hWnd)
 80         return (FALSE);
 81 
 82     ShowWindow(hWnd, nCmdShow);
 83     UpdateWindow(hWnd);
 84 
 85     while (GetMessage(&msg, NULL, NULL,NULL))
 86        {
 87            TranslateMessage(&msg);
 88            DispatchMessage(&msg);
 89        }
 90     return (msg.wParam);
 91 }
 92 
 93 
 94 
 95 /****************************************************************/
 96 /*                      MainWndProc()                           */
 97 /****************************************************************/
 98 
 99 long FAR PASCAL MainWndProc(HWND hWnd, unsigned message,
100                             WORD wParam, LONG lParam)
101 {
102    HDC           hDC;
103    HMENU         hMenu;
104    static BOOL   bLBDown;
105 
106    switch (message)
107     {
108       case WM_CREATE :
109                 hMenu = GetMenu(hWnd);
110                 CheckMenuItem(hMenu, IDM_PENCIL,
111                               MF_CHECKED);
112 
113                 hInst =
114                    ((LPCREATESTRUCT) lParam)->hInstance;
115                 return (0);
116 
117       case WM_COMMAND :
118                 hMenu = GetMenu(hWnd);
119                 switch (wParam)
120                   {
121                     case IDM_PENCIL :
122                     case IDM_LINE :
123 
124                          if (ToolID == wParam)
125                             return (0);
126 
127                          CheckMenuItem(hMenu, ToolID,
128                                         MF_UNCHECKED);
129                          ToolID = wParam;
130                          CheckMenuItem(hMenu, ToolID,
131                                         MF_CHECKED);
132                          break;
133 
134                     case IDM_CLEAR :
135                          InvalidateRect(hWnd, NULL, TRUE);
136                          break;
137 
138                     case IDM_PRINT :
139                          lpPrnDlgProc =
140                               MakeProcInstance(PrnDlgProc,
141                                                hInst);
142                          lpAbortProc =
143                               MakeProcInstance(AbortProc,
144                                                hInst);
145                          PrintGraph(hWnd);
146 
147                          FreeProcInstance(lpPrnDlgProc);
148                          FreeProcInstance(lpAbortProc);
149 
150                          break;
151 
152                     case IDM_QUIT :
153                          DestroyWindow(hWnd);
154                          break;
155                   }
156                 return (0);
157 
158       case WM_SIZE :
159                 CX = LOWORD(lParam);
160                 CY = HIWORD(lParam);
161                 return (0);
162 
163       case WM_LBUTTONDOWN :
164                 SetCapture(hWnd);
165                 bLBDown = TRUE;
166 
167                 OrgPoint = MAKEPOINT(lParam);
168                 CurPoint = PrePoint = OrgPoint;
169 
170                 return (0);
171 
172       case WM_LBUTTONUP :
173                 bLBDown = FALSE;
174                 ReleaseCapture();
175 
176                 hDC = GetDC(hWnd);
177                 DrawGraph(hDC, TRUE);
178                 ReleaseDC(hWnd, hDC);
179 
180                 return (0);
181 
182       case WM_MOUSEMOVE :
183                 if (bLBDown)
184                   {
185                     PrePoint = CurPoint;
186                     CurPoint = MAKEPOINT(lParam);
187 
188                     hDC = GetDC(hWnd);
189                     DrawGraph(hDC, FALSE);
190                     ReleaseDC(hWnd, hDC);
191                   }
192                 return (0);
193 
194       case WM_DESTROY :
195                 PostQuitMessage(0);
196                 return (0);
197 
198       default :
199          return(DefWindowProc(hWnd, message, wParam, lParam));
200     }
201 }
202 
203 
204 
205 void DrawGraph(HDC hDC, BOOL bSure)
206 {
207    switch (ToolID)
208     {
209       case IDM_PENCIL :
210               DrawPencil(hDC);
211               break;
212 
213       case IDM_LINE :
214               DrawLine(hDC, bSure);
215               break;
216     }
217 }
218 
219 
220 
221 void DrawPencil(HDC hDC)
222 {
223    MoveTo(hDC, PrePoint.x, PrePoint.y);
224    LineTo(hDC, CurPoint.x, CurPoint.y);
225 }
226 
227 
228 
229 void DrawLine(HDC hDC, BOOL bSure)
230 {
231    int  nDrawMode;
232 
233    if (! bSure)
234      {
235        nDrawMode = SetROP2(hDC, R2_NOT);
236 
237        MoveTo(hDC, OrgPoint.x, OrgPoint.y);
238        LineTo(hDC, PrePoint.x, PrePoint.y);
239 
240        MoveTo(hDC, OrgPoint.x, OrgPoint.y);
241        LineTo(hDC, CurPoint.x, CurPoint.y);
242 
243        SetROP2(hDC, nDrawMode);
244      }
245    else
246      {
247        MoveTo(hDC, OrgPoint.x, OrgPoint.y);
248        LineTo(hDC, CurPoint.x, CurPoint.y);
249      }
250 }
251 
252 
253 
254 HDC CreateDC_Printer()
255 {
256    HDC  hPrnDC;
257    char szProfile[70];
258    char *szDriver, *szDevice, *szOutput;
259 
260    GetProfileString("windows", "device", "", szProfile, 70);
261 
262    szDevice = (char *) strtok(szProfile, ",");
263    szDriver = (char *) strtok(NULL,     ",");
264    szOutput = (char *) strtok(NULL,     ",");
265 
266    if (szDevice && szDriver && szOutput)
267     {
268       hPrnDC = CreateDC(szDriver, szDevice, szOutput, NULL);
269       return (hPrnDC);
270     }
271 
272    return (NULL);
273 }
274 
275 
276 
277 void PrintGraph(HWND hWnd)
278 {
279    HDC      hDC, hMemDC;
280    HDC      hPrnDC;
281    HBITMAP  hBitmap;
282    BOOL     bPrinted = TRUE;
283    char     szName[] = "Demo8_2 -- Abort Proc";
284 
285    hPrnDC = CreateDC_Printer();
286    if (hPrnDC == NULL)
287      {
288        MessageBox(hWnd, "Printer Error", NULL,
289                   MB_OK | MB_ICONHAND);
290        return ;
291      }
292 
293    hDC = GetDC(hWnd);
294    hMemDC = CreateCompatibleDC(hDC);
295    hBitmap = CreateCompatibleBitmap(hDC, CX, CY);
296 
297    SelectObject(hMemDC, hBitmap);
298    BitBlt(hMemDC, 0, 0, CX, CY, hDC, 0, 0, SRCCOPY);
299    ReleaseDC(hWnd, hDC);
300 
301    bCancel = FALSE;
302    hPrnDlg = CreateDialog(hInst, "PRNDLG", hWnd,
303                           lpPrnDlgProc);
304    Escape(hPrnDC, SETABORTPROC, 0, (LPSTR) lpAbortProc,
305           NULL);
306 
307    if (Escape(hPrnDC, STARTDOC,
308               strlen(szName), szName, NULL) > 0)
309      {
310        BitBlt(hPrnDC, 0, 0, CX, CY, hMemDC, 0, 0, SRCCOPY);
311 
312        if (Escape(hPrnDC, NEWFRAME, 0, NULL, NULL) > 0)
313          Escape(hPrnDC, ENDDOC, 0, NULL, NULL);
314        else
315          bPrinted = FALSE;
316      }
317    else
318      bPrinted = FALSE;
319 
320    if (! bPrinted)
321      MessageBox(hWnd, "Print Error", NULL,
322                 MB_OK | MB_ICONHAND);
323 
324    if (! bCancel)
325      {
326        EnableWindow(hWnd, TRUE);
327        DestroyWindow(hPrnDlg);
328      }
329 
330    DeleteDC(hPrnDC);
331    DeleteDC(hMemDC);
332    DeleteObject(hBitmap);
333 }
334 
335 
336 BOOL FAR PASCAL AbortProc(HDC hPrnDC, short nCode)
337 {
338    MSG  msg;
339 
340    while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
341     {
342       if (bCancel) break;
343       if (! IsDialogMessage(hPrnDlg, &msg))
344         {
345            TranslateMessage(&msg);
346            DispatchMessage(&msg);
347         }
348     }
349 
350    return (! bCancel);
351 }
352 
353 
354 BOOL FAR PASCAL PrnDlgProc(HWND hDlg, WORD msg,
355                            WORD wParam, LONG lParam)
356 {
357    HWND  hPWnd;
358    HMENU hSysMenu;
359 
360    switch (msg)
361     {
362       case WM_INITDIALOG :
363                 hPWnd = GetParent(hDlg);
364                 EnableWindow(hPWnd, FALSE);
365 
366                 hSysMenu = GetSystemMenu(hDlg, 0);
367                 EnableMenuItem(hSysMenu, SC_CLOSE,
368                                MF_GRAYED);
369                 return (TRUE);
370 
371       case WM_COMMAND :
372                 switch (wParam)
373                  {
374                    case DI_CANCEL :
375                           bCancel = TRUE;
376                           hPWnd = GetParent(hDlg);
377                           EnableWindow(hPWnd, TRUE);
378                           DestroyWindow(hDlg);
379                           break;
380                  }
381                 return (TRUE);
382     }
383 
384    return (FALSE);
385 }

						