void CTextView::OnDraw(CDC* pDC) //响应wm_paint消息
{
CTextDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
// TODO: add draw code for native data here
m_str = CString("我是写在OnDraw函数之中");
HDC hdc;
PAINTSTRUCT ps;
hdc = ::BeginPaint(m_hWnd,&ps);
::TextOut(hdc,0,45,m_str,strlen(m_str));
::EndPaint(m_hWnd,&ps);
// pDC->TextOut(0,0,m_str);
用全局函数就不显示字符串啊,只有当我用pDC指针调用textout才能显示出字符串,请问为什么呢?