为何我按照例程来做不行??

Question

如:
http://www.codeguru.com/buttonctrl/ResponsiveBitmapButton.html例程是在CDialog中的,我是用在CFormView里.结果是我在
VERIFY(m_ctlBtnZoomIn.SubclassDlgItem(IDB_BTNZOOMIN,this));
m_ctlBtnZoomIn.SizeToContent();
时出错.我是放在Create()的最后面?请问为何?我应该将此段代码放在什么地方??

Answer 1

VERIFY(m_ctlBtnZoomIn.SubclassDlgItem(IDB_BTNZOOMIN,this));
m_ctlBtnZoomIn.SizeToContent();
---------------
try putting it in :
virtual void CFormView::OnInitialUpdate()
{
}

Answer 2

处理WM_SHOWWINDOW,即放在OnShowWindow(BOOL bShow, UINT nStatus)里
CFormView::OnShowWindow(bShow, nStatus);
VERIFY(m_ctlBtnZoomIn.SubclassDlgItem(IDB_BTNZOOMIN,this));
m_ctlBtnZoomIn.SizeToContent();