GetOpenFileName不返回文件名

[qrwulysses]

调用过程：在CPictureView类中重载OnFileOpen事件，可以得到一个Windows2000风格的对话框，可是调用GetOpenFileName(&ofn)后，ofn里没有返回文件名，真不知到是怎么回事，请大家帮忙

void CPictureView::OnFileOpen()
{
OPENFILENAME ofn; // older version
memset(&ofn, 0, sizeof(ofn));
ofn.lStructSize = sizeof(ofn);

ofn.nMaxFile = _MAX_PATH;//这句不加效果也一样，可以忽略
int nResult = ::GetOpenFileName((OPENFILENAME*)&ofn);

if (nResult == IDOK) {
CPictureDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
Dosth(ofn.lpstrFile);
}
}