hi, I''m new to DPlay8, and i''m trying to create an DPlay Server & Client. But i run in problems to do this. The main problem lays in the DPlay Message Callback function : HRESULT WINAPI DirectPlayMessageHandler( PVOID pvUserContext, DWORD dwMessageId, PVOID pMsgBuffer ) This function won''t work with classes, while it''s __stdcall and not thiscall. I''ve create an internal Message handler in both classes (Client&Server) where i will route all Networkmessages that will arrived at the DPlay Message Callback Funktion. Here is an example how try to do this : // try to rout the messages to the internal message handler cNetwork *pNetInterface = (cNetwork*) pUserContext; if (pNetInterface) return (pNetInterface->NetProc (uiMessageId, pMsgBuffer)); But i don''t know how to set the pvUserContext for the whole runtime of the server or client. Is there a change to encapsule the whole DPlay functionality in classes or is this totaly useless? Pls help, Thanks Imp

Try making the member function static.

Hi,

you can set pvUserContext when you call the Initialize method of your interface (IDirectPlay8Peer, IDirectPlay8Client and IDirectPlay8Server).


cLE

hi,

Anonymous Poster : i have the method declared as static


cLE : are you sure that works for the lifetime of my Client&Server instance? You say i can add these "this" pointer to the ::Initialize () call, but work that only for the first message? Hmm hard to explain, my english suxx


Thanks Imp

It comes with every message:

        //On Init	if(FAILED(hr=m_pDPServer->Initialize(this, MsgProc, 0)))		{		TRACE("DPServer Init Failed\n");		return(hr);		}HRESULT WINAPI CNetworkServerDx8::MsgProc(PVOID pvUserContext, DWORD dwMessageID, PVOID pMsgBuffer)	{	CNetworkServerDx8* This = reinterpret_cast<CNetworkServerDx8*>(pvUserContext);	_ASSERT(This);		switch(dwMessageID)		{		case DPN_MSGID_INDICATE_CONNECT:			return This->IndicateConnect(reinterpret_cast<DPNMSG_INDICATE_CONNECT*>(pMsgBuffer));//...        

Magmai Kai Holmlor
- Not For Rent

Edited by - Magmai Kai Holmlor on September 10, 2001 11:31:58 PM

Hi,

it works always. I''m using the same technique to access my class members.


cLE

Well,

I also use a wrapper class for the DirectPlay8 objects and at first I also had that problem with the DirectPlayMessageHandler.

In the beginning, I made the message handler method static, but then I had to made all members and methods static. That''s because static methods can only access static members (or is this incorrect?).

But just recently (yesterday actually) I rewrote this class so that every member became unstatic. I had to remove the DirectPlayMessageHandler out of the class then and made it a global function. So I just have a prototype of this handler in the class'' header file and the implementation is in my main.

Something like this:

  // NetworkEngine.hpp// function prototype for directplay message handlerHRESULT WINAPI DirectPlayMessageHandler(PVOID pvUserContext, DWORD dwMessageId, PVOID pMsgBuffer);// interface for NetworkEngine classclass NetworkEngine{public:  HRESULT CreatePlayer(PVOID pvUserContext, PVOID pMsgBuffer);...}// Main.cpp// game contains an object of NetworkEngineGame game;...int PASCAL WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdParam, int nCmdShow){  ...}HRESULT WINAPI DirectPlayMessageHandler(PVOID pvUserContext, DWORD dwMessageId, PVOID pMsgBuffer){  switch (dwMessageId)  {  // new player joined session  case DPN_MSGID_CREATE_PLAYER:    game.network->CreatePlayer(pvUserContext, pMsgBuffer);    break;  }  ...  return S_OK;}  

Hi,
At first, thanks for your back answers :D
I will use the solution from Magmai Kai, this shows as the best i think of. Thanks Magmai Kai :D

Thanks, Imp