Windows图形设备接口.ppt

1… #includewindows.h 2… #includestdlib.h 3… #includestring.h 4… long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam); 5… BOOL InitWindowsClass(HINSTANCE hInstance); 6… BOOL InitWindows(HINSTANCE hInstance,int nCmdShow); 7… HWND hWndMain; //主函数 8… int WINAPI W inMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow) 9… { MSG Message; 10… if(!InitWindowsClass(hInstance)) return FALSE; 11… if(!InitWindows(hInstance,nCmdShow)) return FALSE; 12… while(GetMessage(Message,0,0,0)) //消息循环 13… { TranslateMessage(Message); 14… DispatchMessage(Message); } 15… return Message.wParam; } long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam) 1… {HDC hDC; //定义设备环境句柄 2… HBRUSH hBrush; //定义画刷的句柄 3… HPEN hPen; //定义画笔的句柄 4… PAINTSTRUCT PtStr; //定义指向包含绘图信息的结构体变量 //定义一个POINT数组，包括6个点 5… POINT points[6]={{100,212},{70,227},{70,250},{130,250},{130,227},{100,212}}; 6… switch(iMessage) //处理消息 7… { case WM_PAINT: //处理绘图消息 8… hDC=BeginPaint(hWnd,PtStr); 9… hPen=(HPEN)GetStockObject(NULL_PEN); //获取系统定义的空画笔 10… SelectObject(hDC,hPen); //选择画笔 11… hBrush=(HBRUSH)GetStockObject(BLACK_BRUSH); //获取系统定义的画刷 12… SelectObject(hDC,hBrush); //选择画刷 13… LineTo(hDC,50,50); //画线 14… DeleteObject(hPen); //删除画笔 15… hPen=CreatePen(PS_SOLID,2,RGB(255,0,0)); //创建画笔 16… SelectObject(hDC,hPen); //选择画笔 //画一个三角形 17… LineTo(hDC,150,50); 18… LineTo(hDC,100,137); 19… LineTo(hDC,50,50); 1… Polyline(hDC,points,6); //画一个五边形 2… Arc(hDC,63,137,138,212,100,137,100,137); //画一个圆 3… Pie(hDC,213,137,288,212,240,137,260,137); //画一个圆饼 4… Rectangle(hDC,213,212,287,250); //画一个长方形 5… RoundRect(hDC,213,100,287,137,20,20); //画一个圆角长方形 6… DeleteObject(hPen); //删除画笔 7… DeleteObject(hBrush); //删除画刷 8… EndPaint(hWnd,PtStr); //结束绘图 9… return 0; 10…case WM_DESTROY: //结束应用程序 11… PostQuitMessage(0); 12… return 0; 13…default://其他消息处理程序 14… return(DefWindowProc(hWnd,iMessage,wParam,lParam)) ;