HRESULT WINAPI MessageHandler(PVOID pvUserContext, 
            DWORD dwMessageId, PVOID pMsgBuffer);

Quote:Original post by TheMightyDude
Hello All

I have a dll which handles all my networking and a min app.

What I am trying to do is create my own cut down version of DirectPlay to work on Win32 and Linux.
And I am trying to get my networking dll to call a function in my main app.

Like what Microsoft used in DirectPlay and their other libraries to pass information:
HRESULT WINAPI MessageHandler(PVOID pvUserContext,
DWORD dwMessageId, PVOID pMsgBuffer);
Does anyone know how to do these type of callbacks?

I have tried creating threads, external treads with no joy.

Quote:Original post by Anonymous Poster
You seem to be interested in RPC (Remote Procedure Calls)
RPC support is integrated in OpenTNL/The Torque Network Library.

// in your main app.void TheCallback(void){// do something}void main (){RegisterCallBack(&TheCallBack);}//in your dllvoid RegisterCallBack(void(CallBackFunc*)(void)){StoredFunc = CallBackFunc;}void RunCallBack(){StoredFunc();}

Quote:Original post by dormlock
You'll need to have a function in your dll that you can register a function for it to call. If you have messed with threads then you've already done something like that when passing the function pointer for the threads entry point.

Example:

// in your main app.
void TheCallback(void)
{
// do something
}

void main ()
{
RegisterCallBack(&TheCallBack);
}

//in your dll

void RegisterCallBack(void(CallBackFunc*)(void))
{
StoredFunc = CallBackFunc;
}

void RunCallBack()
{
StoredFunc();
}


Hope this is enough to get you started.

Quote:Original post by dormlock
There are other ways you could do it that would probably be more automated. This was just the basics. You can try googling something like function callbacks c++ and go from there.

As far as moving the * I was typing from memory.

int (*callback)(int index, int item, void *param);

In WinMaincallback = TestLoop;int TestLoop(int val1, int val2, void  *data){    char tmpbuf[255] = {0};    sprintf(tmpbuf,"val1: %d, val2: %d, and data: %s\n",val1,val2,data);    MessageBox(0,tmpbuf,"Info",0);    return 1234;}

callback(11,7,(void*)"Test CALL BACK");