请帮忙

Question

在视图对象中
pDC->SelectObject(。。);是什么意思？这个成员函数的功能是什么，请给出中文解释

Answer 1

如：OnDraw(CDC* pDC) 
{ 
CPen pen1,pen2; 
pen1.CreatePen(PS_SOLID,2,RGB(128,128,128));//创建对象 
pen2.CreatePen(PS_SOLID,2,RGB(128,128,0));//创建对象 
CPen* pPenOld=(CPen*)pDC->SelectObject(&pen1);//选择对象进DC 
drawWithPen1... 
(CPen*)pDC->SelectObject(&pen2);//选择对象进DC 
drawWithPen2... 
pen1.DeleteObject();//再次创建前先销毁 
pen1.CreatePen(PS_SOLID,2,RGB(0,0,0));//再次创建对象 
(CPen*)pDC->SelectObject(&pen1);//选择对象进DC 
drawWithPen1... 
pDC->SelectObject(pOldPen);//恢复 
}