ping.c 的调试错误
一下是ping.c源程序，调试时出现以下错误：
-------------------Configuration: Ping - Win32 Debug--------------------
Linking...
Ping.obj : error LNK2001: unresolved external symbol _WSACleanup@0
Ping.obj : error LNK2001: unresolved external symbol _WSAStartup@8
Ping.obj : error LNK2001: unresolved external symbol _closesocket@4
Ping.obj : error LNK2001: unresolved external symbol _inet_ntoa@4
Ping.obj : error LNK2001: unresolved external symbol _gethostbyname@4
Ping.obj : error LNK2001: unresolved external symbol _socket@12
Ping.obj : error LNK2001: unresolved external symbol _sendto@24
Ping.obj : error LNK2001: unresolved external symbol _recvfrom@24
Ping.obj : error LNK2001: unresolved external symbol _WSAGetLastError@0
Ping.obj : error LNK2001: unresolved external symbol _select@20
Debug/Ping.exe : fatal error LNK1120: 10 unresolved externals
Error executing link.exe.
Ping.exe - 11 error(s), 0 warning(s)
是什么原因呢？
//
// PING.C -- Ping program using ICMP and RAW Sockets
//
#include <stdio.h>
#include <stdlib.h>
#include <winsock.h>
#include "ping.h"
// Internal Functions
void Ping(LPCSTR pstrHost);
void ReportError(LPCSTR pstrFrom);
int WaitForEchoReply(SOCKET s);
u_short in_cksum(u_short *addr, int len);
// ICMP Echo Request/Reply functions
int SendEchoRequest(SOCKET, LPSOCKADDR_IN);
DWORD RecvEchoReply(SOCKET, LPSOCKADDR_IN, u_char *);
// main()
void main(int argc, char **argv)
{
WSADATA wsaData;
WORD wVersionRequested = MAKEWORD(1,1);
int nRet;
// Check arguments
if (argc != 2)
{
fprintf(stderr,"\nUsage: ping hostname\n");
return;
}
// Init WinSock
nRet = WSAStartup(wVersionRequested, &wsaData);
if (nRet)
{
fprintf(stderr,"\nError initializing WinSock\n");
return;
}
// Check version
if (wsaData.wVersion != wVersionRequested)
{
fprintf(stderr,"\nWinSock version not supported\n");
return;
}
// Go do the ping
Ping(argv[1]);
// Free WinSock
WSACleanup();
}
// Ping()
// Calls SendEchoRequest() and
// RecvEchoReply() and prints results
void Ping(LPCSTR pstrHost)
{
SOCKET rawSocket;
LPHOSTENT lpHost;
struct sockaddr_in saDest;
struct sockaddr_in saSrc;
DWORD dwTimeSent;
DWORD dwElapsed;
u_char cTTL;
int nLoop;
int nRet;
// Create a Raw socket
rawSocket = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
if (rawSocket == SOCKET_ERROR)
{
ReportError("socket()");
return;
}
// Lookup host
lpHost = gethostbyname(pstrHost);
if (lpHost == NULL)
{
fprintf(stderr,"\nHost not found: %s\n", pstrHost);
return;
}
// Setup destination socket address
saDest.sin_addr.s_addr = *((u_long FAR *) (lpHost->h_addr));
saDest.sin_family = AF_INET;
saDest.sin_port = 0;
// Tell the user what we're doing
printf("\nPinging %s [%s] with %d bytes of data:\n",
pstrHost,
inet_ntoa(saDest.sin_addr),
REQ_DATASIZE);
// Ping multiple times
for (nLoop = 0; nLoop < 4; nLoop++)
{
// Send ICMP echo request
SendEchoRequest(rawSocket, &saDest);
// Use select() to wait for data to be received
nRet = WaitForEchoReply(rawSocket);
if (nRet == SOCKET_ERROR)
{
ReportError("select()");
break;
}
if (!nRet)
{
printf("\nTimeOut");
break;
}
// Receive reply
dwTimeSent = RecvEchoReply(rawSocket, &saSrc, &cTTL);
// Calculate elapsed time
dwElapsed = GetTickCount() - dwTimeSent;
printf("\nReply from: %s: bytes=%d time=%ldms TTL=%d",
inet_ntoa(saSrc.sin_addr),
REQ_DATASIZE,
dwElapsed,
cTTL);
}
printf("\n");
nRet = closesocket(rawSocket);
if (nRet == SOCKET_ERROR)
ReportError("closesocket()");
}
// SendEchoRequest()
// Fill in echo request header
// and send to destination
int SendEchoRequest(SOCKET s,LPSOCKADDR_IN lpstToAddr)
{
static ECHOREQUEST echoReq;
static nId = 1;
static nSeq = 1;
int nRet;
// Fill in echo request
echoReq.icmpHdr.Type = ICMP_ECHOREQ;
echoReq.icmpHdr.Code = 0;
echoReq.icmpHdr.Checksum = 0;
echoReq.icmpHdr.ID = nId++;
echoReq.icmpHdr.Seq = nSeq++;
// Fill in some data to send
for (nRet = 0; nRet < REQ_DATASIZE; nRet++)
echoReq.cData[nRet] = ' '+nRet;
// Save tick count when sent
echoReq.dwTime = GetTickCount();
// Put data in packet and compute checksum
echoReq.icmpHdr.Checksum = in_cksum((u_short *)&echoReq, sizeof(ECHOREQUEST));
// Send the echo request
nRet = sendto(s, /* socket */
(LPSTR)&echoReq, /* buffer */
sizeof(ECHOREQUEST),
0, /* flags */
(LPSOCKADDR)lpstToAddr, /* destination */
sizeof(SOCKADDR_IN)); /* address length */
if (nRet == SOCKET_ERROR)
ReportError("sendto()");
return (nRet);
}
// RecvEchoReply()
// Receive incoming data
// and parse out fields
DWORD RecvEchoReply(SOCKET s, LPSOCKADDR_IN lpsaFrom, u_char *pTTL)
{
ECHOREPLY echoReply;
int nRet;
int nAddrLen = sizeof(struct sockaddr_in);
// Receive the echo reply
nRet = recvfrom(s, // socket
(LPSTR)&echoReply, // buffer
sizeof(ECHOREPLY), // size of buffer
0, // flags
(LPSOCKADDR)lpsaFrom, // From address
&nAddrLen); // pointer to address len
// Check return value
if (nRet == SOCKET_ERROR)
ReportError("recvfrom()");
// return time sent and IP TTL
*pTTL = echoReply.ipHdr.TTL;
return(echoReply.echoRequest.dwTime);
}
// What happened?
void ReportError(LPCSTR pWhere)
{
fprintf(stderr,"\n%s error: %d\n",
WSAGetLastError());
}
// WaitForEchoReply()
// Use select() to determine when
// data is waiting to be read
int WaitForEchoReply(SOCKET s)
{
struct timeval Timeout;
fd_set readfds;
readfds.fd_count = 1;
readfds.fd_array[0] = s;
Timeout.tv_sec = 5;
Timeout.tv_usec = 0;
return(select(1, &readfds, NULL, NULL, &Timeout));
}
//
// Mike Muuss' in_cksum() function
// and his comments from the original
// ping program
//
// * Author -
// * Mike Muuss
// * U. S. Army Ballistic Research Laboratory
// * December, 1983
/*
* I N _ C K S U M
*
* Checksum routine for Internet Protocol family headers (C Version)
*
*/
u_short in_cksum(u_short *addr, int len)
{
register int nleft = len;
register u_short *w = addr;
register u_short answer;
register int sum = 0;
/*
* Our algorithm is simple, using a 32 bit accumulator (sum),
* we add sequential 16 bit words to it, and at the end, fold
* back all the carry bits from the top 16 bits into the lower
* 16 bits.
*/
while( nleft > 1 ) {
sum += *w++;
nleft -= 2;
}
/* mop up an odd byte, if necessary */
if( nleft == 1 ) {
u_short u = 0;
*(u_char *)(&u) = *(u_char *)w ;
sum += u;
}
/*
* add back carry outs from top 16 bits to low 16 bits
*/
sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
sum += (sum >> 16); /* add carry */
answer = ~sum; /* truncate to 16 bits */
return (answer);
}
问题点数：100、回复次数：6Top
1 楼freelybird（阿愚）回复于 2002-04-30 16:12:34 得分 25
#inclde "winsock2.h"Top
2 楼freelybird（阿愚）回复于 2002-04-30 16:14:42 得分 25
在开头再加上这句
#pragma comment(lib, "Ws2_32.lib")Top
3 楼xuying（）回复于 2002-04-30 16:16:02 得分 25
没有加入连接库。
在vc的project->setting->link页面中，object/library modules内加入ws2_32.libTop
4 楼nanjianhui（nan）回复于 2002-04-30 16:18:12 得分 0
看来大家都知道！！！Top
5 楼lqbn（长天）回复于 2002-04-30 16:19:44 得分 25
在vc的project->setting->link页面中，object/library modules内加入ws2_32.lib
Top
6 楼dingkl（）回复于 2002-04-30 17:09:35 得分 0
就是这样Top
相关问题
关键词
得分解答快速导航
相关链接
广告也精彩
反馈
