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GetMessageSource returns a NULL string

Posted: 05/21/2009 08:22:59
by David Perkins (Standard support level)
Joined: 12/03/2008
Posts: 17

I've created a simple server and client to explore MsgConnect. When my server receives a message, calling GetMessageSource from ValidateCredentials returns an empty string. I'm using this in BCB2006 after creating the relevant files in Delphi.

void __stdcall TnMsgConnectServer::ValidateCredentials(TObject *Sender,
PMCMessage Message, PMCMessageCredentials Credentials, bool &Valid)
{ // Transport thread context

String Source = m_pMCMessenger->GetMessageSource( *Message );


Any idea what could cause this to fail?
Posted: 05/21/2009 09:46:00
by David Perkins (Standard support level)
Joined: 12/03/2008
Posts: 17

GetMessageSource works in the Queue UnhandledMessage event, but not in ValidateCredentials. Is this by design, or because ValidateCredentials is called from the transport thread?
Posted: 05/21/2009 10:10:35
by Eugene Mayevski (Team)

I assume that you want to link the message source handle with credential validation. This won't work. The reason is simple: the value returned by GetMessageSource is valid and should be used ONLY for sending something as a separate message. It must not be used to determine actual sender address or to identify the sender in any other way. You must use other authentication means (pass some identifiers in message data, for example) if MessageCredentials is not enough.

Sincerely yours
Eugene Mayevski



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