client2.cpp

此代码为socket通信程序

#include"Winsock.h"
#include"Windows.h"
#include"stdio.h"
#pragma comment(lib,"wsock32.lib")
#define RECV_PORT 2000
#define SEND_PORT 3000
#define MAX_FILESIZE 32*1024

SOCKET sock;
SOCKADDR_IN ServerAddr;


struct Filedata
{
	char ffname[30];
	char ffdata[MAX_FILESIZE];
	int len;
}DataPacket;


DWORD StartSock()
{
   WSADATA WSAData;
   if(WSAStartup(MAKEWORD(2,2),&WSAData)!=0)  //初始化套接字
   {
	   printf("sock init fail!\n");
	   return(-1);
   }
   ServerAddr.sin_family=AF_INET;     //填充服务器地址及其端口号
   ServerAddr.sin_addr.s_addr=inet_addr("59.74.24.138");
   ServerAddr.sin_port=htons(RECV_PORT);
   return(1);
}


DWORD CreateSocket()
{
	sock=socket(AF_INET,SOCK_STREAM,0);  //创建套接字
	if(sock==SOCKET_ERROR)
	{
		printf("sock create fail!\n");
		WSACleanup();
		return(-1);
	}
	return(1);
}

void CallServer()  //呼叫服务器，请求链接
{
	CreateSocket();
	while(connect(sock,(struct sockaddr*)&ServerAddr,sizeof(ServerAddr))==SOCKET_ERROR)
	{
		printf("Connect...\n");
	
	}

}


DWORD GetFile(char *fname)
{
	FILE *fp;
	int Filesize;
	int i;
//	char c;
	int count,totol=0;
	char buffer[100];
	char Senddata[MAX_FILESIZE];
	fp=fopen(fname,"r");//以读方式打开一个文件
	if(fp==NULL)
	{
		printf("cannot open this file!\n");
		return(0);
	}
	i=0;
	Filesize=0;
	memset(Senddata,0,MAX_FILESIZE);
	while(!feof(fp))
	{
		count=fread(buffer,sizeof(char),100,fp);//读方式，一次读入100个字节
		if(ferror(fp))
		{
			printf("Read File error");
			break;
		}
		Filesize+=count;
		if(Filesize>MAX_FILESIZE)
		{
			printf("your file is too big\n");
			fclose(fp);
			return(0);
		}
		memcpy(&Senddata[i],buffer,count);
		i+=count;
	}
	fclose(fp);
	Senddata[i]='\0';
	strcpy(DataPacket.ffname,fname);
    memcpy(DataPacket.ffdata,Senddata,Filesize);
	DataPacket.len=Filesize;
	printf("%s,%d\n",DataPacket.ffname,DataPacket.len);
	return(1);
}

DWORD TCPSendPacket(struct Filedata Packet)   //向服务器发送数据
{
	int length;
	length=send(sock,(char *)&Packet,sizeof(DataPacket),0);
	if(length<=0)
	{
		printf("send data error!\n");
     	closesocket(sock);
		WSACleanup();
		return(-1);
	}
	return(1);
}

int main()
{
	char sendfilename[30];
//	char c;
	StartSock();
    CallServer();

	printf("connectok!\n");

    while(1)
	{
		printf("please input your file name send:(exit--退出)\n");
		scanf("%s",sendfilename);
		if(strcmp(sendfilename,"exit")==0)
			break;
		if(GetFile(sendfilename)==0)
			continue;
		TCPSendPacket(DataPacket);
	}
	closesocket(sock);
	return(0);
}