tcp传输大文件问题

优质创作者: 操作系统技术领域

2013-12-26 10:46:13

今天自己编写了一个tcp传输文件的程序，用小文件和图片试了，都正常，当传输大文件时，程序就莫名死掉了，求大神解答。
接收端代码如下：



        SOCKET sockSrv=socket(AF_INET,SOCK_STREAM,0);  

	if(sockSrv==INVALID_SOCKET)  

	{

		cout<<"Failed socket"<<endl;  

		return 0;  

	}  

	//do not bind  .. dynamic   

	SOCKADDR_IN addrSvr;   

	addrSvr.sin_family=AF_INET;   

	addrSvr.sin_port=htons(8001); 

        addrSvr.sin_addr.S_un.S_addr=inet_addr(ip);   



	if(connect(sockSrv,(SOCKADDR*)&addrSvr,sizeof(addrSvr))==-1)  

	{

		cout<<"tcp连接失败！！"<<endl; 

		return 0;  

	} 



	//receive  

	char buff[200];

	char filename[256]; 

	int nRecv=-1;



	memset(filename,0,sizeof(filename));

    nRecv=recv(sockSrv,filename,sizeof(filename),0);  



	cout<<"接收文件："<<filename<<endl;

	

	FILE * fp;

	fp=fopen(filename,"wb");

	if(fp==NULL)

	{

        cout<<"创建文件失败"<<endl;

		return 0;

	}



	while(1)

	{

		memset(buff,0,sizeof(buff));

		nRecv = -1;

	    nRecv=recv(sockSrv,buff,sizeof(buff)-1,0);  

	

		if(nRecv <= 0)

			break;

		cout<<buff<<endl;;

        fwrite(buff,nRecv,1,fp);

	

		

	}

    cout<<"接收完成!!"<<endl;



	fclose(fp);

	closesocket(sockSrv);

发送端代码如下：



SOCKET sockSrv=socket(AF_INET,SOCK_STREAM,0);  

	if(sockSrv==INVALID_SOCKET)  

	{

		cout<<"Failed socket"<<endl;  

		return 0;  

	}  

	//do not bind  .. dynamic   

	SOCKADDR_IN addrSvr,addrClient; 

	int len=sizeof(addrClient);

	addrSvr.sin_family=AF_INET;   

	addrSvr.sin_port=htons(8001); 

    addrSvr.sin_addr.S_un.S_addr=INADDR_ANY;   

    // 绑定IP和端口

    if ( bind(sockSrv, (sockaddr*)&addrSvr, sizeof(addrSvr)) == SOCKET_ERROR)

    {

         cout << "tcp绑定IP和端口失败!"<<endl;

         return 0;

    }



    if (listen(sockSrv, 1) == SOCKET_ERROR)

    {

         cout << "tcp监听端口失败!" << endl;

         return 0;

    }



	//receive  

	char buff[200];

	char filename[256]; 

	int nRead;

	SOCKET sockConn;



	cin>>filename;



	sockConn = accept(sockSrv,(SOCKADDR*)&addrClient, &len);  



    int err=send(sockConn,filename,strlen(filename),0);

	cout<<err<<endl;



	FILE * fp;

	fp=fopen(filename,"rb");



	while(1)

	{

		if(feof(fp))

			break;

		nRead = -1;

		memset(buff,0,sizeof(buff));

		nRead=fread(buff,1,sizeof(buff)-1,fp);

	

		cout<<buff<<endl;

        nRead=send(sockConn,buff,nRead,0);

		

	}



	cout<<"发送完成！！"<<endl;

	fclose(fp);

	closesocket(sockConn);  

	closesocket(sockSrv);