View Full Version : what is equivalent to _bstr_t?
steg90
14th May 2007, 07:47
Hi,
I have a COM DLL I wrote in C# which I call from one of my MFC applications as follows:
BOOL CDADcb::OpenDatabase( CString strFilename )
{
BSTR bstrName = strFilename.AllocSysString();
m_bLoaded = m_spDCBParse->OpenDatabase( bstrName );
return m_bLoaded;
}
My problem is, what data type do I use as the BSTR using Qt4?
Kind regards,
Steve
vermarajeev
14th May 2007, 08:09
Hi,
I have a COM DLL I wrote in C# which I call from one of my MFC applications as follows:
BOOL CDADcb::OpenDatabase( CString strFilename )
{
BSTR bstrName = strFilename.AllocSysString();
m_bLoaded = m_spDCBParse->OpenDatabase( bstrName );
return m_bLoaded;
}
My problem is, what data type do I use as the BSTR using Qt4?
Kind regards,
Steve
By seeing your code, I think strFilename.AllocSysString() return QCString. Since there is no QCString in Qt4 you can use QByteArray. See qtassistance for more information.
steg90
14th May 2007, 08:18
Hi,
The AllocSysString returns a BSTR, but there doesn't seem to be an equivalent in Qt4? The code I'm showing is for MFC. I just want to know how I can call the OpenDatabase function which takes a _bstr_t data type, I don't know what the equivalent is in Qt.
Regards,
Steve
vermarajeev
14th May 2007, 08:45
Hi,
The AllocSysString returns a BSTR, but there doesn't seem to be an equivalent in Qt4? The code I'm showing is for MFC. I just want to know how I can call the OpenDatabase function which takes a _bstr_t data type, I don't know what the equivalent is in Qt.
Regards,
Steve
What is BSTR??? What is the return type??
steg90
14th May 2007, 09:11
Hi,
BSTR is OLECHAR*
I have just done the following which works :
BOOL CDADcb::OpenDatabase( CString strFilename )
{
m_bLoaded = FALSE;
BSTR s = SysAllocString( (OLECHAR*)strFilename.unicode() );
m_bLoaded = m_spDCBParse->OpenDatabase( s );//strFilename );
SysFreeString( s );
return m_bLoaded;
}
Regards,
Steve
wysota
14th May 2007, 09:57
Why not use the same type as in other C++ apps? You don't have to use Qt classes everywhere...
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