[其他] 一个WIN32 SDK编程的问题

the window procedure could call a function that sends the window procedure another message, in which case the window procedure must finish processing the second message before the function call returns, at which time the window procedure proceeds with the original message. For example, when a window procedure calls UpdateWindow, Windows calls the window procedure with a WM_PAINT message. When the window procedure finishes processing the WM_PAINT message, the UpdateWindow call will return controls back to the window procedure.

               static char i[2] = {'0','\0'};
                case WM_PAINT:
                        hdc = BeginPaint(hWnd, &ps);
                        // TODO: Add any drawing code here...
                        RECT rt;
                       
                        GetClientRect(hWnd, &rt);
                        DrawText(hdc, "start", 5, &rt, DT_CENTER);
                        EndPaint(hWnd, &ps);
                        SendMessage(hWnd, WM_PAINT,0 ,0);
                        MessageBox(hWnd,i,"paint",0);
                        DrawText(hdc, "end", 3, &rt, DT_CENTER);
                        EndPaint(hWnd, &ps);
                       
                        i[0] = i[0]+1;
                        break;