GDI编程

1. GDI编程基本步骤

MFC OnPaint()函数中代码实现步骤

	//获取DC
		CPaintDC dc(this);
	//创建GDI对象
		//创建画刷
		CBrush newBrush;
		CBrush *pOldBrush;
		newBrush.CreateSolidBrush(RGB(0,255,0));		
		//创建画笔
		CPen newPen;
		CPen *pOldPen;
		newPen.CreatePen(PS_SOLID,1,RGB(0,0,255));
		//创建字体
		CFont newFont;
		CFont *pOldFont;
		newFont.CreatePointFont(200,"宋体");
	//把GDI对象写入DC
		//将画刷写入DC
		pOldBrush=dc.SelectObject(&newBrush);
		//将画笔写入DC
		pOldPen=dc.SelectObject(&newPen);
		//将字体写入DC
		pOldFont=dc.SelectObject(&newFont);
	//绘图和字体输出
		CRect rc;
		GetClientRect(&rc);
		dc.Rectangle(rc);
		dc.TextOut(150,150,"画刷绿色，画笔蓝色");
	//恢复画刷，画笔和字体
		dc.SelectObject(pOldBrush);
		dc.SelectObject(pOldPen);
		dc.SelectObject(pOldFont);
	//删除新建画刷,画笔和字体
		newBrush.DeleteObject();
		pOldBrush->DeleteObject();
		newPen.DeleteObject();
		pOldPen->DeleteObject();
		newFont.DeleteObject();
		pOldFont->DeleteObject();
	//释放DC，析构函数直接释放