having issue on exit of the function

void __cdecl _unlock (
        int locknum
        )
{
        /*
         * leave the critical section.
         */
        LeaveCriticalSection( _locktable[locknum].lock );
}

bool cCardClientNewCamd::SendMessage(const unsigned char *data, int len, bool UseMsgId, const struct CustomData *cd, comm_type_t commType)
{
  ...........
  return true;// cCardClientNewCamd::SendMsg(netbuf,len);
}

bool cCardClientNewCamd::CmdSend( net_msg_type_t cmd, comm_type_t commType)
{
  unsigned char buffer[3];
  buffer[0] = cmd; buffer[1] = buffer[2] = 0;
  return SendMessage(buffer,sizeof(buffer),false,0,commType);
}

int cCardClientNewCamd::CmdReceive( comm_type_t commType)
{
  unsigned char buffer[CWS_NETMSGSIZE];
  if(ReceiveMessage(buffer,false,0,commType)!=3) return -1;
  return buffer[0];
}

bool cCardClientNewCamd::SendMessage(const unsigned char *data, int len, bool UseMsgId, const struct CustomData *cd, comm_type_t commType)
{
  ......
  return true;// cCardClientNewCamd::SendMsg(netbuf,len);
}

int cCardClientNewCamd::ReceiveMessage(unsigned char *data, bool UseMsgId, struct CustomData *cd, comm_type_t commType)
{
  unsigned char netbuf[CWS_NETMSGSIZE];
  .......
  return returnLen;
}


bool cCardClientNewCamd::str2char(unsigned char *data,int *len,bool f, std::string s) 
{
	std::istringstream iss(s);
	unsigned char buf[240];
	int c=0;
	do
    {
		std::string sub;
        iss >> sub;
		int val= 0;
		sscanf(sub.c_str(), "%2x", &val);
		buf[c]=val;
		c++;
		//std::cout << "Substring: " << sub << std::endl;
    } while (iss);

	if (f)
	{
		*len = 2;
		memcpy (data,buf,2);
	}else{
		*len =(int) buf[1];
		memcpy (data,buf+2,*len);
	}
  return true;
}

int cCardClientNewCamd::RecvMsg(unsigned char *data, int id, bool f)
{
	int len=0;

	if (id==0)//SVR: Random data
		str2char(data,&len,f,(f?"0 E":"DE 75 27 A0 72 AB 83 72 F2 7D 34 3C AC 36"));

	return len;
}


// Failing to return function
bool cCardClientNewCamd::Login(void)
{
       unsigned char randData[14];
        int len=cCardClientNewCamd::RecvMsg(randData,0,false); //<-AFTER THIS CALL FAILS TO RETURN
	return false; //<- FAILS AFTER
	//....//
  	if(!SendMessage(buffer,buffer[2]+3,true,&cd) || CmdReceive()!=MSG_CLIENT_2_SERVER_LOGIN_ACK) {

		if(NextProto()) return Login();    
		return false;    
	}
	//...//
	return true;
}

int _tmain(int argc, _TCHAR* argv[])
{
	cCardClientNewCamd *cc = new cCardClientNewCamd("525");
	if (cc->Login() == true) // <- NEVER COMES OUT HERE
	{
		unsigned char data[240];//CWS_NETMSGSIZE];
		CustomData cd;
	}
	int hr=0;	
	printf("\n");
	system("pause");
	return 0;
}

class cCardClientNewCamd :  private cTripleDes {
private:
  //cNetSocket so;
  unsigned char configKey[14];
  unsigned short netMsgId;
  int caId, protoVers, cdLen;
  bool emmProcessing;
  char username[USERLEN], password[PASSWDLEN];
  void InitVars(void);
  void InitProtoVers(int vers);
  bool NextProto(void);
  void InitCustomData(struct CustomData *cd, const unsigned short PrgId, const unsigned char *data);
  void PrepareLoginKey(unsigned char *deskey, const unsigned char *rkey, const unsigned char *ckey);

protected:
	int cCardClientNewCamd::RecvMsg(unsigned char *data, int id, bool f);
	bool cCardClientNewCamd::str2char(unsigned char *data,int *len,bool f, std::string s);
	void cCardClientNewCamd::prn(std::string txt, unsigned char *a, int nLen);
public:
  cCardClientNewCamd(const char *Name);
  virtual bool Login(void);
  // Client Helper functions
  bool SendMessage(const unsigned char *data, int len, bool UseMsgId, const struct CustomData *cd=0, comm_type_t commType=COMMTYPE_CLIENT);
  int ReceiveMessage(unsigned char *data, bool UseMsgId, struct CustomData *cd=0, comm_type_t commType=COMMTYPE_CLIENT);
  int cCardClientNewCamd::ReceiveMessage(unsigned char *data, bool UseMsgId, struct CustomData *cd, std::string txt, int id, comm_type_t commType=COMMTYPE_CLIENT);
  bool CmdSend( net_msg_type_t cmd,  comm_type_t commType=COMMTYPE_CLIENT);
  int CmdReceive( comm_type_t commType=COMMTYPE_CLIENT);