differentiate connect(signals/slots) and connect(TCP/ip)

[qtlinuxnewbie]

HI,

In my Qt project, i have a thread to connect server. when i write the code with
connect(sockfd,...)
Qt is assuming it, as the connect , which is used to connect signals and slots
so how should i differentiate that???


Thnx in advance;

[squidge]

Try ::connect(...) and QObject::connect()

[qtlinuxnewbie]

i dont want the slots connect.
i need the tcp connect but qt is taking this connect as the slots and giving the error...
i tried .. but no use

[nish]

are you sure you are include the correct headers for socket programming? ::connect() should work fine

[qtlinuxnewbie]

Yes,
i am already using in the Main.cpp..
so if it fails to connect in main.cpp .
i have to reconnect so, i am implementing in separate thread to connect again.
but i am getting the above problem which i mentioned.

[spirit]

if you use Qt, why don't you use QtNetwork module instead of using std functions?

[qtlinuxnewbie]

i dont have any idea about the QtNetwork modules.
moreover i have already used std fnctions in main.cpp . it worked well
but in separate thread it is using the slot connect.
why ?

[spirit]

i dont have any idea about the QtNetwork modules.

read this.

moreover i have already used std fnctions in main.cpp . it worked well
but in separate thread it is using the slot connect.
why ?

show us compilable example which reproduces the problem.

[qtlinuxnewbie]

This is main.cpp

#include <QtGui/QApplication>
#include "vms.h"
#include "ConnectServer.h"

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <QMessageBox>
#include <QFile>

#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <stdint.h>
#include <assert.h>

#include "defines.h"
#include "structs.h"
#include "tsadc.h"


int thresholdValuesem;
void *cThresholdValueAddrs;
key_t semkey;
int shmid;
key_t key;
int gnSampleFactor;

int sockfd;
struct sockaddr_in serv_addr;
struct hostent *host_name;
int SERV_TCP_PORT;
char SERV_HOST_ADDR[20];
char gcPassword[20];

int gnConnectFailed;

tsadc adc;

int main(int argc, char *argv[])
{

bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family =AF_INET;
serv_addr.sin_addr.s_addr =inet_addr(SERV_HOST_ADDR);
serv_addr.sin_port =htons(SERV_TCP_PORT);

/*open a TCP socket */

if((sockfd=socket(AF_INET,SOCK_STREAM,0)) < 0)
{
vmslog << "VmsERROR:can't open stream socket" << "\n";
vmslog.flush();
}

/*connect to the server*/

if((gnConnectFailed=connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr))) == -1)
{
vmslog << "VmsERROR:can't connect to server" << "\n";
vmslog.flush();

}


QApplication a(argc, argv);
vms w;
w.show();
return a.exec();
}

this is the thread.cpp

#include "ConnectServer.h"
#include <QThread>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/ipc.h>
#include <netdb.h>

#include <QMessageBox>

extern int sockfd;
extern struct sockaddr_in serv_addr;
extern int gnConnectFailed;
extern struct hostent *host_name;
extern int SERV_TCP_PORT;
extern char SERV_HOST_ADDR[20];

ConnectServerThread::ConnectServerThread()
{

}

void ConnectServerThread::connectServer()
{

while(gnConnectFailed==-1)
{
/*Reconnect to the server*/

if((gnConnectFailed=connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr))) == -1)
{
//Connection Failed

}

}

}

[spirit]

did you try to write like this?

if((gnConnectFailed=::connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr))) == -1)

if((gnConnectFailed=::connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr))) == -1)

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[qtlinuxnewbie]

i tried in the above manner
successful in compilation. .
but it is still taking the slots connect.(i can say this, as it gives the IntelliSense ).

[franz]

Show your code, then we can tell why. Probably you aren't using ::connect().