Calling a method from a non-member method

Hi, I need to call a method from a non-member function. Is there a way to reach an object from the outside? (i'm sorry that i can't find the right way to express my question, but please bear with me...) I'm loking for something like
Appname->object.processMessage()
but I can't find a way to do it.
This is a stub of my class implementation.
I'm working with a subclass of QThread and HLP_Init comes from an external library. I tried to pass the method directly to the HLP Init, but that did not work because the compiler complained that the type of function was not right.

Code:

---

void HLPReceiveMessage(tyHLP_Message message, tyHLP_LinkID linkId)
{
       //i need to call void HLP_LinkManager::processMessage() here
}
 
void HLPReceiveError(tyHLP_Error err, tyHLP_LinkID linkId)
{
}
 
void HLP_LinkManager::run()
{
    int rc;
    //HLP server initialization
    rc=HLP_Init(HLP_LINK_SERVER,HLPReceiveMessage,HLPReceiveError);
}
 
 void HLP_LinkManager::processMessage()
{
   //do stuff here
}

---

And thanks in advance!

Just add a parameter to the functions, of type HLP_LinkManager*.

Code:

---

void HLP_LinkManager::run()
{
    int rc;
    //HLP server initialization
    rc=HLP_Init(HLP_LINK_SERVER,HLPReceiveMessage,HLPReceiveError,this);
}
 
 
void HLPReceiveMessage(tyHLP_Message message, tyHLP_LinkID linkId,HLP_LinkManager* pHlpMgr)
{
       pHlpMgr->processMessage();
}

---

The problem is that I can't alter the HLP_Init nor the RecieveMessage declarations. That is why i'm trying to acess from a global variable.
In any case, taking into account your idea, i've been thinking in whether i can wrap those functions, but i can't get to anything that works.

You need an instance of HLP_LinkManager to be able to call non-static member methods. If you cannot provide an instance then you cannot access these methods.

in that case, the only option I see is using a global:

Code:

---

HLP_LinkManager *g_pLinkMgr = NULL;
 
void HLPReceiveMessage(tyHLP_Message message, tyHLP_LinkID linkId)
{
       //i need to call void HLP_LinkManager::processMessage() here
     if(g_pLinkMgr){
       g_pLinkMgr->processMessage();
     }
}
 
void HLP_LinkManager::run()
{
    int rc;
    g_pLinkMgr = this;
    //HLP server initialization
    rc=HLP_Init(HLP_LINK_SERVER,HLPReceiveMessage,HLPReceiveError);
}

---

Thanks, the code that you provided is better than mine, i did not thought about leaving the global as null and then using "this", but now this way solves my problem