Windows下C 用 Socket 发送图片--基础

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Windows下C 用 Socket 发送图片--基础

服务器端:

#include <stdio.h>
#include <winsock2.h>
#include <winsock2.h>
#define SERVER_PORT 9210 //侦听端口
#pragma comment(lib,"ws2_32.lib")

struct Data //数据包
{
	int length;
	char receivemessage[2000]; //内容信息
	int fin;
}data;

int main()
{
	FILE * fp;
	if (!(fp = fopen("abc.jpg", "wb+")))
	{
		printf("open abc.jpg error");
		exit(0);
	}
	WORD wVersionRequested;//双字节；高字节存取副版本号，低字节存取高版本号。
	WSADATA wsaData;//存取套接字实现的具体信息
	int ret,  length;
	SOCKET sListen, sServer; //侦听套接字，连接套接字
	struct sockaddr_in saServer, saClient; //地址信息  
 
	//WinSock初始化
	wVersionRequested = MAKEWORD(2, 2); 
	ret = WSAStartup(wVersionRequested, &wsaData); 
	if (ret != 0)
	{
		printf("WSAStartup() failed!\n");
		return 0;
	}
	//创建Socket,使用TCP协议
	sListen = socket(AF_INET, SOCK_STREAM, 0);
	if (sListen == INVALID_SOCKET)
	{
		WSACleanup();
		printf("socket() faild!\n");
		return 0;
	}
	//构建本地地址信息
	saServer.sin_family = AF_INET; //地址家族
	saServer.sin_port = htons(SERVER_PORT); //注意转化为网络字节序
	saServer.sin_addr.S_un.S_addr = htonl(INADDR_ANY); //使用INADDR_ANY 指示任意地址 

													   //绑定
	ret = bind(sListen, (struct sockaddr *)&saServer, sizeof(saServer));
	if (ret == SOCKET_ERROR)
	{
		printf("bind() faild! code:%d\n", WSAGetLastError());
		closesocket(sListen); //关闭套接字
		WSACleanup();
		return 0;
	}

	//侦听连接请求
	ret = listen(sListen, 5);
	if (ret == SOCKET_ERROR)
	{
		printf("listen() faild! code:%d\n", WSAGetLastError());
		closesocket(sListen); //关闭套接字
		return 0;
	}

	printf("Waiting for client connecting!\n");
	printf("Tips: Ctrl+c to quit!\n");
	length = sizeof(saClient);
	sServer = accept(sListen, (struct sockaddr *)&saClient, &length);
	if (sServer == INVALID_SOCKET)
	{
		printf("accept() faild! code:%d\n", WSAGetLastError());
		closesocket(sListen); //关闭套接字
		WSACleanup();
		return 0;
	}

	//阻塞等待接受客户端连接
	while (!data.fin)
	{
		memset(data.receivemessage, '0', sizeof(data.receivemessage));
		ret = recv(sServer, (char *)&data, sizeof(struct Data), 0);  //第二个参数使用强制类型，为一个数据包
		if (ret == SOCKET_ERROR)
		{
			printf("recv() failed!\n");
			return 0;
		}
		if (ret == 0) //客户端已经关闭连接
		{
			printf("Client has closed the connection\n");
			break;
		}
		fwrite(data.receivemessage, data.length, 1, fp);
	}

	  closesocket(sListen);
	  closesocket(sServer);
	  WSACleanup();
	return 0;
}

客户端:

#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>
#define SERVER_PORT 9210 //侦听端口
#pragma comment(lib,"ws2_32.lib")

struct Data
{
	int length;
	char sendMessage[2000];
	int fin;
}data;

int main()
{
	FILE * fp;
	errno_t err = fopen_s(&fp, "D:\\7.jpg", "rb+");
	WORD wVersionRequested;
	WSADATA wsaData;
	int ret;
	SOCKET sClient; //连接套接字
	struct sockaddr_in saServer; //地址信息

	BOOL fSuccess = TRUE;

	fseek(fp, 0, SEEK_END);
	int end = ftell(fp);
	fseek(fp, 0, 0);
	//WinSock初始化
	wVersionRequested = MAKEWORD(2, 2); //希望使用的WinSock DLL的版本
	ret = WSAStartup(wVersionRequested, &wsaData);
	if (ret != 0)
	{
		printf("WSAStartup() failed!\n");
		return 0;
	}
	//确认WinSock DLL支持版本2.2
	if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2)
	{
		WSACleanup();
		printf("Invalid WinSock version!\n");
		return 0;
	}
	//创建Socket,使用TCP协议
	sClient = socket(AF_INET, SOCK_STREAM, 0);
	if (sClient == INVALID_SOCKET)
	{
		WSACleanup();
		printf("socket() failed!\n");
		return 0;
	}
	//构建服务器地址信息
	saServer.sin_family = AF_INET; //地址家族
	saServer.sin_port = htons(SERVER_PORT); //注意转化为网络节序
	saServer.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
	//连接服务器
	ret = connect(sClient, (struct sockaddr *)&saServer, sizeof(saServer));
	if (ret == SOCKET_ERROR)
	{
		printf("connect() failed!\n");
		closesocket(sClient); //关闭套接字
		WSACleanup();
		return 0;
	}

	int nZero = 10;
	setsockopt(sClient, SOL_SOCKET, SO_SNDBUF, (char *)&nZero, sizeof(nZero));
	while (end > 0)
	{
		memset(data.sendMessage, '0', sizeof(data.sendMessage));
		fread(data.sendMessage, 1024, 1, fp);
		if (end >= 1024) //剩余很多信息
		{
			data.fin = 0;
			data.length = 1024;
		}
		else
		{
			data.fin = 1;
			data.length = end;
		}
		ret = send(sClient, (char *)&data, sizeof(struct Data), 0);
		if (ret == SOCKET_ERROR)
		{
			printf("send() failed!\n");
		}
		else
		{
			end -= 1024;
		}
	}

	closesocket(sClient); //关闭套接字
	WSACleanup();
	return 0;
}