My program has two threads one for reading the data of the client (RXTHREAD) and putting that data of client in a structure called qstr(which contains client Ip address,message,etc), the object of this queue(put_inq) should be placed in a Structure called (que), the SXTHREAD should then pop the object put_inq and use the IP address to send back the data to the client?

Iam getting an error saying like this
:error: In function ‘void* RXTHREAD(void*)’:
: error: cannot convert ‘qstr’ to ‘char’ in assignment

The aim of the program is to put the data of the client in a stucture and pass the structure object to queue and pop the object of queue in SXTHREAD and reply back to the same client .

Regards
suraj

#include<iostream>
#include<sys/socket.h>
#include<sys/types.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<pthread.h>
#include<unistd.h>
#define MAXLENGTH 100
#define MAXSIZE 10
using namespace std;

	struct sockaddr_in server;
	struct sockaddr_in client;
        pthread_t tid;
	char buf[MAXLENGTH];
	int size, rcx,rcs;
	socklen_t fromlen = 0;
	int socketid;
	int bufsize;

	struct qstr 
	{
		char msgbuffer[100];
		int NoBytesRcv;
		char *cliadd;
	}put_inq;

	struct que
	{
		int front,rear;
		char queue[MAXSIZE];
	}q;

	int full(void)
	{
		if (q.rear == MAXSIZE)
		return(1);
		else
		return(0);
	}

	int empty(void)
	{
		if (q.front == q.rear + 1)
		return(1);
		else
		return(0);
	}

void *RXTHREAD(void *)
{
	while(1)
	{
			//size is no.of bytes received from the client program.
	size = recvfrom(socketid,buf,sizeof(buf),0,(struct sockaddr *)&client,(socklen_t *) &fromlen);
	if(size < 0)
	cout<< " \n Error In Receiving "<<endl;
	else
	cout<<" \n Received Size of Data From Client Is : "<<size<<endl;
	cout<<" The Clients IP Address Is :"<<inet_ntoa(client.sin_addr)<<endl;
	put_inq.cliadd = inet_ntoa(client.sin_addr);
	cout<<" The Clients IP Address Is :"<<put_inq.cliadd<<endl;
	put_inq.NoBytesRcv = size;
	cout<<" No.of Bytes Received Are : "<<put_inq.NoBytesRcv;
	memcpy( put_inq.msgbuffer,&buf,size );
	cout<<" \n The Message Is "<<put_inq.msgbuffer<<endl;

			// Storting The Structure Object In que STRUCTURE 
	if(full() == 1)
	{
		cout<<"\n\nQueue Full\n";
		break;
	}
	else
	{
		q.rear = q.rear + 1;
		//cout<<"\nEnter An Element to Be Added ";
		//cin>>x;
		q.queue[q.rear] = put_inq;
		if(q.rear == 1) 
		q.front ++;
	}
  	}
}

void *SXTHREAD(void *)
{
	while(1)
	{
	sleep(6);
	if(empty() == 1)
	{
		cout<<"\n\nQueue Empty\n";
		break;
	}
	else
	{
		cout<<q.queue[q.front]<<endl;//" Has Been Deleted!";
		//s.front = s.front +1;
	}
	if(put_inq.NoBytesRcv > 0)
	{	
	cout<<"\n Replying Client"<<endl;
	cout<<" \n Clients IP Address IS :: "<<put_inq.cliadd<<endl;
	cout<<" \n Enter A String "<<endl;
	gets(buf);
	cout<<"\n Sending............"<<endl;
	sendto(socketid,buf,sizeof(buf),0,(struct sockaddr*)&client,fromlen);
	cout<<" \n Message Sent "<<endl;
	cout<<" \n Server Online "<<endl; 
	size=0;
	}
	else 
	cout<<" \n Nothing Received From Client "<<endl;
	}
}

int main(void)
{
	socketid = socket(AF_INET, SOCK_DGRAM , 0);
	if(socketid < 0)
	{
		cout<<" \n Error Creating A Socket"<<endl;
	}
	server.sin_family=AF_INET;
	server.sin_port=htons(9999);
	server.sin_addr.s_addr=htonl(INADDR_ANY);
	memset(&(server.sin_zero), '\0', 8);	
	cout<<" \n ***************** BINDING SOCKET ***************** "<<endl;
	if( bind(socketid, (struct sockaddr *)&server, sizeof(server)) == -1)
	{ 
		cout<<" \n Error Binding The Socket"<<endl;
		return(0);
	}
	cout<<"\n Socket Bound"<<endl;
	fromlen=sizeof(struct sockaddr); 

	//Creating A Thread
	cout<<"  \n Starting Thread "<<endl;
	rcx = pthread_create(&tid, NULL, RXTHREAD ,NULL);
	rcs = pthread_create(&tid, NULL, SXTHREAD ,NULL);
	if (rcx!=0 && rcs!=0)
	{
        	cout<<" \n ERROR; return code from pthread_create() is %d%d\n"<<rcx<<rcs<<endl;
        	return 0;
	}
	while(1)
	{ 
		usleep(1600);
	}
}

line 79.... q.queue[q.rear] = put_inq; You are assigning an entire struct to this other struct (they are not the same kind of struct)? put_inq might need to have a member attached?

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