Linker Errors when Compiling C Socket Program in DevC++

[shinsengumi]

Hello all. I'm trying to compile a socket program in DevC++ but everytime I do it I get a lot of linker. I have previously run the socket program successfully in Linux but I have to export it to WindowsXP, and I must admit I'm relatively new to programming in WindowsXP. I also learned that to solve these linker problems I need to link the libraries to the program and that's my main problem now. How do I link the libraries in WindowsXP and make the program in DevC++ work? By the way I'm using C programming language. Please help me solve this problem. Thanks!

 

[bluehole]

Hello all. I'm trying to compile a socket program in DevC++ but everytime I do it I get a lot of linker. I have previously run the socket program successfully in Linux but I have to export it to WindowsXP, and I must admit I'm relatively new to programming in WindowsXP. I also learned that to solve these linker problems I need to link the libraries to the program and that's my main problem now. How do I link the libraries in WindowsXP and make the program in DevC++ work? By the way I'm using C programming language. Please help me solve this problem. Thanks!

I guess you are directly compiling the Linux code using DevCpp.
For most of the things it works. But As you told you are writing socket program, I guess you are missing initializing the Winsock startup.

Try checking that.

Next: Try linking with Static lib(*.a) if it again gives you error then please contact me with detail output eror.

Hope this helps.

 

[shinsengumi]

First off thanks for the reply.

I didn't compile the Linux program on windows as is. I've edited my program's header files such that the program may be compiled on windows. I attached them in my previous post but since I'm new here I wasn't allowed to post such links yet so I removed them(but after this post I'll be allowed to do so.) I used header files like windows.h winsock2.h and the lean_and_mean thing. I edited the source code according to the syntax understandable by windows but still I wasn't able to compile it. From reading articles I knew I needed to link the socket libraries into my program but that's my problem now, How do I link the libraries? Where will I find those *.a things? Please help me sort things out. Thanks

 

[srizbf]

i assume that you have changed the include files for windows (as given in post) and you have properly initialised winsock ,

include -lws2_32 may solve your problem.

 

[shinsengumi]

i assume that you have changed the include files for windows (as given in post) and you have properly initialised winsock ,

include -lws2_32 may solve your problem.

Thanks! Most of the linker errors were gone now. Some still remained though:

  [Linker error] undefined reference to `inet_pton' 
  [Linker error] undefined reference to `index'

I used inet_pton and *index in the Linux program. Do you know of their supposed counterparts for windows? These are the header files I used:

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
//#include <winsock.h>
#include <winsock2.h>
#include <stdio.h>
#include <string.h>

#include <ws2tcpip.h>
#include <stdlib.h>
#include <stdio.h>
// Need to link with Ws2_32.lib, Mswsock.lib, and Advapi32.lib
#pragma comment (lib, "Ws2_32.lib")
#pragma comment (lib, "Mswsock.lib")
#pragma comment (lib, "AdvApi32.lib")

I have some questions though. I don't know how to properly check the winsock version of my windows but when I checked the system32 folder, I found the winsock.dll file so I think the windows I have has winsock version 1.1 right? But how come ws2_32 worked for me? Isn't it for winsock version 2.2?

WSAStartup(MAKEWORD(1,1), &wsaData);

How do I know whether to put 1,1 or 2,2 or 2,0? Thanks

 

[srizbf]

inet_pton is not available in windows.
you have to use win32api ,
WSAStringToAddress(...)
to write the equivalent.


by writing ,
WSAStartup(MAKEWORD(1,1), &wsaData);
you are asking for winsock library of version 1.1 or "higher".
so you need not be concerned with the version in the system.
(though you can write a code to print the version no . for diagnostic purpose)

 

[shinsengumi]

inet_pton is not available in windows.
you have to use win32api ,
WSAStringToAddress(...)
to write the equivalent.


by writing ,
WSAStartup(MAKEWORD(1,1), &wsaData);
you are asking for winsock library of version 1.1 or "higher".
so you need not be concerned with the version in the system.
(though you can write a code to print the version no . for diagnostic purpose)

I tried using WSAStringToAddressA:

int main(int argc, char **argv) {
  SOCKADDR_IN servaddr;
  char   AddrValue[256] = "10.36.7.172";
  char   AddrString[256]  = "Some dummy value";
  DWORD   dwSizeOfStr = sizeof(AddrValue);
  int    nSizeOfInput = sizeof(AddrString);
  WSADATA wsaData;
  SOCKET ConnectSocket = INVALID_SOCKET;
  int iResult;

  // Initialize Winsock
  iResult = WSAStartup(MAKEWORD(1,1), &wsaData);
  if (iResult != 0) {
      printf("WSAStartup failed with error: %d\n", iResult);
      //system("PAUSE");
      return 1;
  }

  ZeroMemory(&servaddr, sizeof(servaddr));
  servaddr.sin_family = AF_INET;
  servaddr.sin_port = htons(80);
  //servaddr.sin_addr.ConnectSocket_addr = inet_addr("10.36.7.172");
  //inet_pton(AF_INET,"10.36.7.172",&servaddr.sin_addr);
  if(WSAStringToAddressA(AddrValue, AF_INET, NULL, (LPSOCKADDR)&servaddr, &nSizeOfInput) != 0)
  {
    printf("\nWSAStringToAddressA failed with error num %ld\n", WSAGetLastError());
    WSACleanup();
    //system("PAUSE");
    return 1;
  }

It didn't work though. I think I'm just missing something here. I just copied and edited the part where I used WSAStringToAddressA so there is a part of it that I didn't really understand. That part is the last parameter in the function "&nSizeOfInput". What is it really for and do I really need it? nSizeOfInput is just the size of "AddrString" which doesn't really hold the IP address string, but why should it be a parameter of WSAStringToAddressA? I just found a handful of tutorials in the internet and none really explained this function in detail. Could you explain to me how WSAStringToAddressA really works? Thanks a lot.