请教一个基础的winsock编程问题

[aiyaya730]

我按照某教科书上写了最基础的 tcp 连接的代码，client 端在调 connect() 函数时，总是返回 SOCKET_ERROR.
GetLastError() 有时是 10014 有时是 10056
在代码里，选择性忽略这两种错误，有的时候代码能够工作正常，有时候不行。
想请教出现这种情况的原因.
server 代码:

#include <stdio.h>
#include <WinSock2.h>

#define	BUF_SIZE	1024

void ErrorHandling(char* message)
{
	fputs(message,stderr);
	fputs("\n",stderr);
	exit(1);
}

int main(int argc,char* argv[])
{
	WSADATA	wsaData;
	SOCKET	hServerSock,hClientSock;

	
	char	message[BUF_SIZE];
	int		strLen;

	if( argc != 2)
	{
		printf("Usage : %s <port>\n",argv[0]);
		exit(1);
	}

	
	if(WSAStartup(MAKEWORD(2,2),&wsaData) != 0 )
		ErrorHandling("WSAStartup() error");

	hServerSock = socket(PF_INET,SOCK_STREAM,0);
	if( hServerSock == INVALID_SOCKET)
		ErrorHandling("socket() error");


	
	SOCKADDR_IN	servAdr,clntAdr;
	int	clntAdrSize = 0;

	memset(&servAdr,0,sizeof(SOCKADDR_IN));
	servAdr.sin_family = AF_INET;
	servAdr.sin_addr.s_addr = htonl(INADDR_ANY);
	servAdr.sin_port = htons(atoi(argv[1]));

	if( bind(hServerSock,(SOCKADDR*)&servAdr,sizeof(servAdr)) == SOCKET_ERROR )
		ErrorHandling("bind() error");

	if( listen(hServerSock,5) == SOCKET_ERROR )
		ErrorHandling("listen() error");


	clntAdrSize = sizeof(clntAdr);

	for( int i = 0;i < 5;i++ )
	{
		hClientSock = accept(hServerSock,(SOCKADDR*)&clntAdr,&clntAdrSize);
		if( hClientSock == - 1 )
			ErrorHandling("accept() error");
		else
			printf("Connected client %d \n",i + 1);

		while( (strLen = recv(hClientSock,message,BUF_SIZE,0)) != 0 )
		{
			send( hClientSock,message,strLen,0);
		}

		closesocket(hClientSock);
	}

	closesocket(hServerSock);
	WSACleanup();

	return 0;
}

client 代码:

#include <stdio.h>
#include <winsock2.h>

#define	BUF_SIZE	1024
void ErrorHandling(char* message);

int main(int argc,char* argv[])
{
	WSADATA	wsaData;
	SOCKET	hSocket;
	char	message[BUF_SIZE];
	int strLen;
	SOCKADDR_IN	servAdr;


	if( argc != 3 )
	{
		printf("Usage : %s <IP> <port>\n",argv[0]);
		exit(1);
	}

	if( WSAStartup(MAKEWORD(2,2),&wsaData) != 0 )
		ErrorHandling("WSAStartup() error");

	hSocket = socket(PF_INET,SOCK_STREAM,0);
	if( hSocket == INVALID_SOCKET)
		ErrorHandling("socket() error");

	memset(&servAdr,0,sizeof(servAdr));
	servAdr.sin_family = AF_INET;
	servAdr.sin_addr.s_addr = inet_addr(argv[1]);
	servAdr.sin_port = htons(atoi(argv[2]));
	//servAdr.sin_addr.s_addr = inet_addr("127.0.0.1");
	//servAdr.sin_port = htons(atoi("6666"));


	connect(hSocket,(SOCKADDR*)&servAdr,sizeof(servAdr));
	if( connect(hSocket,(SOCKADDR*)&servAdr,sizeof(servAdr) == SOCKET_ERROR) )
	{
		DWORD lasterror = GetLastError();
		ErrorHandling("connect() error");
	}
	puts("conntected.....");

	while(true)
	{
		fputs("Input message(Q to quit): ",stdout);
		fgets(message,BUF_SIZE,stdin);

		if( !strcmp(message,"q\n") || !strcmp(message,"Q\n"))
			break;

		send(hSocket,message,strlen(message),0);
		strLen = recv(hSocket,message,BUF_SIZE - 1,0);
		message[strLen] = 0;
		printf("Message from server: %s",message);
	}

	closesocket(hSocket);
	WSACleanup();

	return 0;
}

void ErrorHandling(char* message)
{
	fputs(message,stderr);
	fputs("\n",stderr);
	exit(1);
}

[mrlgy]

53行 send(hSocket,message,strlen(message),0); strlen改为sizeof试一试， 10056是以前的连接没有关闭吧

[zhousitiaoda]

为什么要connect2次。。。

[oyljerry]

client不要connect两次

[aiyaya730]

谢谢楼上几位帮忙. 昨天晚上敲例子时间太晚了比较困,可能有一些错误. 10054 确实是因为 connect 了两遍,有失误. 但是常常 10014的问题还没弄明白具体原因,好在现在在家重新敲的代码没有出现10014.