error LNK1120 & LNK2001:

[hanhao]

--------------------Configuration: ctl_one - Win32 Debug--------------------
Compiling...
ctl_one.c
Linking...
ctl_one.obj : error LNK2001: unresolved external symbol _ReportError
Debug/ctl_one.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

ctl_one.exe - 2 error(s), 0 warning(s)


===========

here's my code

#include <windows.h>
#pragma comment(lib, "wsock32.lib")

#include <winsock.h>
#include <stdio.h>






#define NETWORK_ERROR -1
#define NETWORK_OK     0

void ReportError(int, const char *);


int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR lpCmd, int nShow) {
	WORD sockVersion;
	WSADATA wsaData;
	int nret;
	SOCKET listeningSocket;
	SOCKADDR_IN serverInfo;
	SOCKET theClient;

	sockVersion = MAKEWORD(1, 1);			// We'd like Winsock version 1.1



	// We begin by initializing Winsock
	WSAStartup(sockVersion, &wsaData);


	// Next, create the listening socket


	listeningSocket = socket(AF_INET,		// Go over TCP/IP
			         SOCK_STREAM,   	// This is a stream-oriented socket
				 IPPROTO_TCP);		// Use TCP rather than UDP

	if (listeningSocket == INVALID_SOCKET) {
		nret = WSAGetLastError();		// Get a more detailed error
		ReportError(nret, "socket()");		// Report the error with our custom function

		WSACleanup();				// Shutdown Winsock
		return NETWORK_ERROR;			// Return an error value
	}


	// Use a SOCKADDR_IN struct to fill in address information


	serverInfo.sin_family = AF_INET;
	serverInfo.sin_addr.s_addr = INADDR_ANY;	// Since this socket is listening for connections,
							// any local address will do
	serverInfo.sin_port = htons(8888);		// Convert integer 8888 to network-byte order
							// and insert into the port field


	// Bind the socket to our local server address
	nret = bind(listeningSocket, (LPSOCKADDR)&serverInfo, sizeof(struct sockaddr));

	if (nret == SOCKET_ERROR) {
		nret = WSAGetLastError();
		ReportError(nret, "bind()");

		WSACleanup();
		return NETWORK_ERROR;
	}


	// Make the socket listen
	nret = listen(listeningSocket, 10);		// Up to 10 connections may wait at any
							// one time to be accept()'ed

	if (nret == SOCKET_ERROR) {
		nret = WSAGetLastError();
		ReportError(nret, "listen()");

		WSACleanup();
		return NETWORK_ERROR;
	}


	// Wait for a client




	while(1)
	{

	theClient = accept(listeningSocket,
			   NULL,			// Address of a sockaddr structure (see explanation below)
			   NULL);			// Address of a variable containing size of sockaddr struct

	if (theClient == INVALID_SOCKET) {
		nret = WSAGetLastError();
		ReportError(nret, "accept()");

		WSACleanup();
		return NETWORK_ERROR;
	}
	else if ("1" == "1")
	{}
	listeningSocket = theClient;
    break;
  }



	// Send and receive from the client, and finally,
	closesocket(theClient);
	closesocket(listeningSocket);


	// Shutdown Winsock
	WSACleanup();
	return NETWORK_OK;
}

anyone knows what's wrong?


using vc++6.0

[hk_mp5kpdw]

You have the function prototype for the ReportError function but there is no code anywhere in the sample you provided for it. Solution... write some code for the ReportError function!

[deadpoet]

This is just a guess. I see your prototype for ReportError

void ReportError(int, const char *);

but I do not see the actual function. Is it contained somewhere else? If you have cut and pasted the code from some other source or used code from a book, it is common for the developer/author to have listed this function in another file or chapter.


Just some thoughts.

DeadPoet