利用socket获取网页内容

#include        <stdio.h>
#include        <winsock.h>
#include        <string.h>
#pragma comment(lib, "ws2_32.lib")

void geturl(char *url)
{
	WSADATA						WSAData={0};
	SOCKET						sockfd;
	struct sockaddr_in			addr;
	struct hostent				*pURL;
	char						myurl[BUFSIZ];
	char						*pHost = 0, *pGET = 0;
	char						host[BUFSIZ], GET[BUFSIZ];
	char						header[BUFSIZ] = "";
	static char					text[BUFSIZ];
	int							i;

	/*
	*        windows下使用socket必须用WSAStartup初始化，否则不能调用
	*/
	if(WSAStartup(MAKEWORD(2,2), &WSAData))
	{
		printf("WSA failed\n");
		return;
	}

	/*
	*        分离url中的主机地址和相对路径
	*/
	strcpy(myurl, url);
	for (pHost = myurl; *pHost != '/' && *pHost != '\0'; ++pHost);
	if ( (int)(pHost - myurl) == strlen(myurl) )
		strcpy(GET, "/");
	else
		strcpy(GET, pHost);
	*pHost = '\0';
	strcpy(host, myurl);
	printf("%s\n%s\n", host, GET);

	/*
	*        设定socket参数,并未真正初始化
	*/
	sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
	pURL = gethostbyname(host);
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = *((unsigned long*)pURL->h_addr);
	addr.sin_port = htons(80);

	/*
	*        组织发送到web服务器的信息
	*        为何要发送下面的信息请参考HTTP协议的约定
	*/
	strcat(header, "GET ");
	strcat(header, GET);
	strcat(header, " HTTP/1.1\r\n");
	strcat(header, "HOST: ");
	strcat(header, host);
	strcat(header, "\r\nConnection: Close\r\n\r\n");

	/*
	*        连接到服务器，发送请求header，并接受反馈（即网页源代码）
	*/
	connect(sockfd,(SOCKADDR *)&addr,sizeof(addr));

	send(sockfd, header, strlen(header), 0);

	while ( recv(sockfd, text, BUFSIZ, 0) > 0)
	{        
		printf("%s", text);
		strnset(text, '\0', BUFSIZ);
	}

	closesocket(sockfd);

	WSACleanup();
}

int main()
{
	char        url[256];
	printf("http://");
	scanf("%s", url);
	geturl(url);
	return 0;
}

转载于:https://www.cnblogs.com/lgh1992314/archive/2013/02/03/5835205.html