怎样在对话框上画一条指定粗细及线型的线条。

Question

大家好，我想在窗体上画一条指定好线型、粗细及颜色的线条，我该怎么做，下面有何错误吗？void CSomeTestOnDialogDlg::OnButton1() 
{
CPen pen(PS_SOLID,20,RGB(112,213,112));
CDC *pDC= GetDC();
CDC memdc;
if(!memdc.CreateCompatibleDC(pDC))
  return;
CRect rect;
GetClientRect(rect);
memdc.SelectObject(pen);
memdc.MoveTo(0,0);
memdc.LineTo(200,200);
pDC->BitBlt(rect.left,rect.top,rect.Width(),rect.Height(),&memdc,0,0,SRCCOPY);
memdc.DeleteDC();
ReleaseDC(pDC);
}

Answer 1

CPen pen(PS_SOLID,20,RGB(112,213,112));这句就有定义阿

Answer 2

CDC *pDC;
试试CPaintDC
CWindowDC

Answer 3

CPen pen(PS_SOLID,20,RGB(250,2,1));
CWindowDC *pDC = new CWindowDC(this);
CRect rect;
GetClientRect(&rect);
pDC->SelectObject(pen);
pDC->MoveTo(0,0);
pDC->LineTo(200,200);

Answer 4

CPen pen(PS_SOLID,20,RGB(250,2,1));
CWindowDC *pDC = new CWindowDC(this);
CRect rect;
GetClientRect(&rect);
pDC->SelectObject(pen);
pDC->MoveTo(0,0);
pDC->LineTo(200,200);
不要忘记释放pDC

Answer 5

在释放CWindowDC对象时，ReleaseDC与DeleteDC有什么区别吗？对了，还有一个DeleteObject了，这三者之间有什么区别吗？