Try tracing the following code:

#import "MSXML6.dll" named_guids

bool File2String( LPCTSTR FileName, CString & FileContent )
{
     DWORD dwSize = 0, dwReadSize = 0;
     HANDLE hFile = NULL;
     HFILE hfOpened = NULL;
     OFSTRUCT oOfs;
     try
     {
           ZeroMemory(&oOfs, sizeof(oOfs));
           FileContent.Empty();

           hFile = (HANDLE) OpenFile(FileName, &oOfs, OF_READ);
           if (hFile!=INVALID_HANDLE_VALUE)
           {
                 dwSize = GetFileSize(hFile, NULL);
                 if ( dwSize == 0 )
                 {
                       CloseHandle(hFile);
                       return false;
                 }
                 ReadFile(hFile,FileContent.GetBuffer(dwSize),dwSize,&dwReadSize,NULL);
                 CloseHandle(hFile);

                 FileContent.GetBufferSetLength(dwSize);
           }
           else
           {
                 ATLTRACE("Error %i opening file: %s\n", GetLastError(), FileName);
                 return false;
           }
     }
     catch ( ... )
     {
           return false;
     }
     return true;
}

CString sXML;
File2String(path_to_your_vdx, sXML);

MSXML2::IXMLDOMDocument2Ptr m_xmldoc;
m_xmldoc.CreateInstance(MSXML2::CLSID_DOMDocument60);
VARIANT_BOOL success = m_xmldoc->loadXML((LPCTSTR) sXML);

Where does it fail?

Stoyan

Here is a version that loads the file using XmlDocument->Load:
https://mindfusion.org/_temp/FcxVisioImport2.zip

We used OpenFile in order to be able to load the file while it is opened in Visio. With that latest version that won't be possible, because XmlDocument->Load requires exclusive access to the file for some reason.

Stoyan

thanks a million. transfer ok, why so diffrense with source visio,