problem in connect code

**lolguy** · 02-23-2009

Code:

#include <stdio.h>
#include <windows.h>
#include <winsock.h>
#include <stdlib.h>//for NULL coz its macro is declared in it
#pragma comment(lib,"wsock32.lib")

void connect_ftp()
{
	char ftpname[]="74.50.26.15";//just test addr
	WORD sockVersion;
	WSADATA wsaData;
	SOCKET badanie;//intilizing our we gonna use in connecting to ftp
	//USE SOCKADDR_IN struct to fill in address information
	SOCKADDR_IN sockinfo;
	int errorwhy;
	sockVersion=MAKEWORD(2,2);
	/*NEXT WE BEGING INITLIZING WINSOCK*/
	WSAStartup(sockVersion,&wsaData);
	badanie=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	if(badanie!=0)
	{
		errorwhy=WSAGetLastError();	
		exit(0);
	}
	sockinfo.sin_family=AF_INET;//says we wanna use TCP/IP
	sockinfo.sin_addr=inet_addr(ftpname);
	sockinfo.sin_port=htons(21);
	connect(badanie,(struct SOCKADDR_IN *)&sockinfo,sizeof sockinfo);
	if(connect==0)  puts("Conncted");
	puts("PW wrong");

}
int main(void)
{
	connect_ftp();
	return 0;
}

it gives me those errors

D:\all PRO program you did\projects\connect to ftp\main.c(26) : error C2115: '=' : incompatible types
D:\all PRO program you did\projects\connect to ftp\main.c(28) : warning C4133: 'function' : incompatible types - from 'struct SOCKADDR_IN *' to 'const struct sockaddr *'
Error executing cl.exe.

isnt those suppose = for like the ip it will connect 2 ?

**MK27** · 02-23-2009

A sockaddr and a sockaddr_in are not the same thing, which I think you know. But they almost are. Your problem is probably this line (b/t/w, I cannot imagine a compiler with more useless output than this one).

Code:

connect(badanie,(struct SOCKADDR_IN *)&sockinfo,sizeof sockinfo);

You probably want to cast as a (struct sockaddr*) instead. Also (I don't know if this matters, but...) I would have used inet_aton here:

Code:

sockinfo.sin_addr=inet_addr(ftpname);

But the windows API is slightly different for sockets, methinks. Someone else may confirm or deny.

**lolguy** · 02-23-2009

oh yah and also i made mistake with connect

Code:

if (connect(badanie,(SOCKADDR_IN*)&sockinfo,sizeof sockinfo) == 0) { puts("Connected"); } else puts("........ YOU !!!");

coz it doesnt return a value

**lolguy** · 02-23-2009

i still get the error now
D:\all PRO program you did\projects\connect to ftp\main.c(21) : error C2115: '=' : incompatible types

i dunno why

**matsp** · 02-23-2009

Originally Posted by lolguy

i still get the error now
D:\all PRO program you did\projects\connect to ftp\main.c(21) : error C2115: '=' : incompatible types

i dunno why

Presumably you have changed the code a bit, since it's now on a line 5 lines away from your original post...

--
Mats

**lolguy** · 02-23-2009

i think incompatible types coz i made it an array in the function says its a const char ptr i made it this const char *ftpname="74.50.26.15";//just test addr
and i still get error

**MK27** · 02-23-2009

connect() returns 0 except on error.

My only guess about the "incompatible types" (which I found the line numbers in your compiler output now, so I am probably right) was the edit in my last post which you may have missed, regarding the use of inet_aton

**lolguy** · 02-23-2009

oh yah it works now i changed this

Code:

#include <stdio.h>
#include <windows.h>
#include <winsock.h>
#include <stdlib.h>//for NULL coz its macro is declared in it
#pragma comment(lib,"wsock32.lib")

void connect_ftp()
{
	const char *ftpname="74.50.26.15";//just test addr
	WORD sockVersion;
	WSADATA wsaData;
	SOCKET badanie;//intilizing our we gonna use in connecting to ftp
	//USE SOCKADDR_IN struct to fill in address information
	SOCKADDR_IN sockinfo;
	sockVersion=MAKEWORD(2,2);
	/*NEXT WE BEGING INITLIZING WINSOCK*/
	WSAStartup(sockVersion,&wsaData);
	badanie=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	sockinfo.sin_family=AF_INET;//says we wanna use TCP/IP
	sockinfo.sin_addr.s_addr=inet_addr(ftpname);
	sockinfo.sin_port=htons(21);
	if (connect(badanie,(struct sockaddr*)&sockinfo,sizeof sockinfo) == 0) { puts("Connected"); } 
		else 
			puts("............ YOU !!!");
}
int main(void)
{
	connect_ftp();
	return 0;
}

but it says alawys connected and i dont axx to it since its just a test addr did i ........ up somewhere in the code?

**lolguy** · 02-23-2009

i wanted to ask sockinfo.sin_addr.s_addr why is it 2 structure i fixed coz i saw in some code he using two . is it double structure or what ? can u do double structure ?

**carrotcake1029** · 02-23-2009

If it returns 0, you got connected, which from what I can decipher from that previous post is probably what is happening.

Also I tested it myself, and it works. If your worried about your program ending, you need to call a blocking function so that it won't. (recv, select, poll, etc)

What exactly are you trying to say in your last post?

Edit: Was typing during your post.

A C struct can actually contain structs inside of itself. It just so happens that the struct you pass to connect has some structs inside of it that you need to manipulate. If you want a very basic example that uses this, look at a singly linked list.

**Snafuist** · 02-23-2009

lolguy, maybe you want to have a look at Beej's Guide to Network Programming, which I consider to be the best introduction to the topic available so far. It's quite UNIX-specific, but applying the advices from chapter 1.5, you should be able to run most of the examples. Most programmers consider network programming in general to be a highly advanced topic, so don't expect too much from this board until you're familiar with the fundamental principles, data structures and so on.

(b/t/w, I cannot imagine a compiler with more useless output than this one)

See here: http://www.ralentz.com/old/mac/humor/mpw-c-errors.html

Greets,
Philip

**MK27** · 02-23-2009

You probably won't know until you try it for real. Networking code is tricky. Yes there are two structures inside each other -- they are defined in one of those includes, if you want to look.

**lolguy** · 02-23-2009

oh oki thanks guys there also http://johnnie.jerrata.com/winsocktutorial/ i ill start with it then i ill go to beej
most books i saw are unix based

**MK27** · 02-23-2009

On windows you cannot use local sockets, which is a shame because they are slightly simpler and easier to experiment with. But (as you may know already) if you have two computers on a router at home you can use their LAN addresses (192.168...) and do complete TCP/IP networking using little clients and servers. That means
1) If anyone else lives there and uses them, you can do some almost frightening things.
2) You can be sure everything works before you unleash your program upon the world.

**lolguy** · 02-23-2009

i also figured out why it alawys says connected coz it connected not loged in

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