用CxImage儲存圖片，遇到個問題，儲存後的圖片是0位元組，程式碼如下：

BOOL CHalftoningDoc::OnSaveDocument(LPCTSTR lpszPathName){
    // TODO: Add your specialized code here and/or call the base class
    m_image.Save(lpszPathName，CXIMAGE_FORMAT_JPG);
    
   return CDocument::OnSaveDocument(lpszPathName);
}

後來用了個笨辦法，解決了儲存的問題，不過會彈出兩次對話方塊：

	CString strFilter, fileName;
	strFilter=_T("JPEG影象檔案|*.jpg||");
	CFileDialog dlg(FALSE,_T("jpg"),lpszPathName,NULL,strFilter);
	if(IDOK==dlg.DoModal())
	{
		fileName = dlg.GetPathName();
		HRESULT hResult = m_image.Save(fileName, CXIMAGE_FORMAT_JPG);
	}

	return 0;
	//return CDocument::OnSaveDocument(lpszPathName);
 

	m_image.Save(lpszPathName,CXIMAGE_FORMAT_JPG);
	return TRUE;
	//return CDocument::OnSaveDocument(lpszPathName);

原因不清楚...請指點

注：儲存時，需在彈出的對話方塊中輸入副檔名 .jpg