Question

MFC怎样清除picture control的图片？

需要加载多张图片，想要点击button1的时候在picture control里显示图1，再点击button2加载图2，希望图2也显示在这个picture control里，覆盖原来的图1，picture control的ID为IDC_IMG。
void CImageStitchingDlg::OnBnClickedButton1()
{

CFileDialog opendlg (TRUE,_T("*"),_T("*.bmp"),OFN_OVERWRITEPROMPT, _T("所有文件(*.*;)|*.*||"),NULL);
if (opendlg.DoModal()==IDOK)
{
filename=opendlg.GetPathName();
}
HANDLE hHandle=::LoadImageW(NULL,filename,IMAGE_BITMAP,480,360,LR_LOADFROMFILE);
m_Picture.SetBitmap((HBITMAP)MAKEINTRESOURCE(hHandle));
}
void CImageStitchingDlg::OnBnClickedButton2()
{
CFileDialog opendlg (TRUE,_T("*"),_T("*.bmp"),OFN_OVERWRITEPROMPT, _T("所有文件(*.*;)|*.*||"),NULL);
if (opendlg.DoModal()==IDOK)
{
filename2=opendlg.GetPathName();
}
HANDLE hHandle=::LoadImageW(NULL,filename,IMAGE_BITMAP,480,360,LR_LOADFROMFILE);
m_Picture.SetBitmap((HBITMAP)MAKEINTRESOURCE(hHandle));
}
MFC新手，求教了，多谢！

Answer 1

	CFileDialog opendlg (TRUE,_T(""),_T(""),OFN_OVERWRITEPROMPT, _T("位图文件(*.bmp;)|*.bmp||"),NULL);   
	if (opendlg.DoModal()==IDOK)
	{
		filename=opendlg.GetPathName();  
		HBITMAP hHandle=(HBITMAP)::LoadImage(NULL,filename,IMAGE_BITMAP,480,360,LR_LOADFROMFILE);
		HBITMAP oldb = m_Picture.SetBitmap(hHandle);
		DeleteObject(oldb);
	}