[SOLVED] Problem with recv() in c++

vbx_wx · 02-24-2010, 11:28 AM

Hello,i want to send a file using TCP/IP...send() seems to work,but recv() doesnt,here is my code:

Code:

void Wsk::sendfile(string path)
	{
		char* buffer = new char[5];
		ifstream in(path.c_str() , ios::binary);
		while((in.read(buffer , 5).eof()) == false)
		{
			cout <<::send(sock , buffer , 5 , 0);
		}
		delete [] buffer;
	}

	void Wsk::receivefile(string path)
	{
		char* buffer = new char[5];
		int byte_recv = 0;
		ofstream in(path.c_str() , ios::binary);
		while((byte_recv = ::recv(sock , buffer , 5 , 0)) > 0)
		{
			cout <<byte_recv;
			in.write(buffer , 5);
		}
		delete [] buffer;
	}
################# CLIENT ######################################
int main()
{

	try {
		Client xx("127.0.0.1" , 2896);

		string msg;
		try {
			while(1)
			{
				xx.sendfile("/home/vBx/testfile");
			}
		}catch(ExcepClass&) {}
		xx.sendfile("/home/vBx/testfile.txt");
	}catch(ExcepClass& m) {
		cout << m.error() << endl;
	}
}

###################### SERVER ########################################

int main()
{
	string msg;
	try {
			Server x(2896);
			while(1)
			{
				Server ser;
				x.accept(ser);
			try {
				while(1)
				{
			x.receivefile("home/vBx/recvtestfile.txt");
					
				}
			}catch(ExcepClass&) {}
			}
	}catch(ExcepClass& m) {
		cout << m.error() << endl;
	}
}

the client prints 5555555555555555555555555555555555555.....so its sending the chunks of data....but in recievefile recv return -1,so its not working.....anyone knows what am i doing wrong ? thank you

David1357 · 02-24-2010, 01:02 PM

Quote:

Originally Posted by vbx_wx

...anyone knows what am i doing wrong?

Check the value of "errno" after the failed call to "recv" and print the error string using "strerror". You will have to include "errno.h" and "string.h".

vbx_wx · 02-24-2010, 05:13 PM

i am getting this : Transport endpoint is not connected...........

Aquarius_Girl · 02-24-2010, 10:23 PM

Quote:

Originally Posted by vbx_wx

i am getting this : Transport endpoint is not connected...........

Try searching the error message "Transport endpoint is not connected" on Google. I did the same (for you) and found that many people have faced this before !! You can have a look at their situations and may be you'll get a hint !

vbx_wx · 02-25-2010, 04:03 AM

i did that already...but i still don't have a clue what to do..i didnt find nothing related to my program...some people just used a command in the terminal but they were using solaris or something,i use fedora,and it seems it didnt work for me

Aquarius_Girl · 02-25-2010, 04:10 AM

Quote:

Originally Posted by vbx_wx

i did that already...but i still don't have a clue what to do..i didnt find nothing related to my program...some people just used a command in the terminal but they were using solaris or something,i use fedora,and it seems it didnt work for me

U mean that command didn't execute on your system or it didn't have the effect after execution ?

vbx_wx · 02-25-2010, 04:18 AM

i didnt execute on my sistem...but i found a similar thread here with this error and someone said :
The problem is the wait = yes option. For TCP connections xinetd seems to try and pass sockets around, instead of starting the server and redirecting STDIN/STDOUT.

Set wait = no for TCP streams. This is what I did to fix this exact same problem I was having. Below is my final configuration in /etc/xinetd.d/myservice:

but in /etc/xinetd i dont have myservice to change that....

Aquarius_Girl · 02-25-2010, 04:28 AM

Post the link to that thread here

vbx_wx · 02-25-2010, 04:55 AM

http://www.linuxquestions.org/questi...nnected-37633/

vbx_wx · 02-25-2010, 06:24 AM

i found this : http://www.troubleshooters.com/codecorn/sockets/
i made everything he said there...still getting the error............

Aquarius_Girl · 02-25-2010, 06:31 AM

That new link says you create a file in /etc/xinetd.d.

If you followed that, put your created file here in [CODE] tags .

vbx_wx · 02-25-2010, 06:47 AM

these is teh process in /etc/services:

Code:

vbxsock         4196/tcp                # my client server program

and this is the file in /etc/xinetd.d/

Code:

# default: on
# description: vBx client server program
service vbxsock
{
   port            = 4196
   socket_type     = stream
   wait            = no
   user            = vBx
   server          = /home/vBx/workspace/server/src/server.cpp
   log_on_success  += USERID
   log_on_failure  += USERID
   disable         = no
}

i changed the root from "vBx" to "root" still not working,and the port is not used in /etc/services ..what did i do wrong ?

vbx_wx · 02-25-2010, 09:21 AM

i solved that error....in main() i was using the old socket to receive the file instead of the new one from accept() function,stupid me...thanx for the replies

Aquarius_Girl · 02-25-2010, 10:28 PM

Quote:

Originally Posted by vbx_wx

i solved that error....in main() i was using the old socket to receive the file instead of the new one from accept() function,stupid me...thanx for the replies

It is good something worked for you !

Could you now post the working code here for other newbie's to see if they face the same problem ?

vbx_wx · 02-26-2010, 04:07 AM

Client:

Code:

        void Wsk::sendfile(string path)
	{
		char* buffer = new char[5];
		ifstream in(path.c_str() , ios::binary);
		while((!in.read(buffer , 5).eof()))
		{
			cout <<::send(sock , buffer , 5 , 0);
		}
		delete [] buffer;
	}

int main()
{

	try {
		Client xx("127.0.0.1" , 4196);

		string msg;
		xx.sendfile("/home/vBx/testfile");
	     }catch(ExcepClass& m) {
		    cout << m.error() << endl;
	}
}

Server:

Code:

void Wsk::receivefile(string path)
	{
		char* buffer = new char[5];
		int byte_recv = 0;
		ofstream in(path.c_str() , ios::binary);
		while(((byte_recv = ::recv(sock , buffer , 5 , 0)) > 0))
		{
			cout <<byte_recv;
			in.write(buffer , 5);
		}
		delete [] buffer;
	}

int main()
{
	string msg;
	try {
			Server x(4196);
			while(1)
			{
				Server ser;
				x.accept(ser);
			ser.receivefile("/home/vBx/recvtestfile.txt");		
			}
	}catch(ExcepClass& m) {
		cout << m.error() << endl;
	}
}