示例程序,转载自CNBLOG,做了针对C语言编译器的适应性修正:
#include <stdio.h>#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib") /* WinSock使用的库函数 */
/* 定义常量 */
#define HTTP_DEF_PORT 80 /* 连接的缺省端口 */
#define HTTP_BUF_SIZE 1024 /* 缓冲区的大小 */
#define HTTP_HOST_LEN 256 /* 主机名长度 */
char *http_req_hdr_tmpl = "GET %s HTTP/1.1\r\n"
"Accept: image/gif, image/jpeg, */*\r\nAccept-Language: zh-cn\r\n"
"Accept-Encoding: gzip, deflate\r\nHost: %s:%d\r\n"
"User-Agent: Huiyong's Browser <0.1>\r\nConnection: Keep-Alive\r\n\r\n"
/**************************************************************************
*
* 函数功能: 解析命令行参数, 分别得到主机名, 端口号和文件名. 命令行格式:
* [http://www.baidu.com:8080/index.html]
*
* 参数说明: [IN] buf, 字符串指针数组
* [OUT] host, 保存主机
* [OUT] port, 端口
* [OUT] file_name, 文件名
*
* 返 回 值: void.
*
**************************************************************************/
void http_parse_request_url(const char *buf, char *host,
unsigned short *port, char *file_name)
{
int length = 0
char port_buf[8]
char *buf_end = (char *)(buf + strlen(buf))
char *begin, *host_end, *colon, *file
/* 查找主机的开始位置 */
begin = (char*)(strstr(buf, "//"))
begin = (begin ? begin + 2 : (char*)(buf))
colon = strchr(begin, ':')
host_end = strchr(begin, '/')
if (host_end == NULL)
{
host_end = buf_end
}
else
{ /* 得到文件名 */
file = strrchr(host_end, '/')
if (file && (file + 1) != buf_end)
strcpy(file_name, file + 1)
}
if (colon) /* 得到端口号 */
{
colon++
length = host_end - colon
memcpy(port_buf, colon, length)
port_buf[length] = 0
*port = atoi(port_buf)
host_end = colon - 1
}
/* 得到主机信息 */
length = host_end - begin
memcpy(host, begin, length)
host[length] = 0
}
int main(int argc, char **argv)
{
WSADATA wsa_data
SOCKET http_sock = 0 /* socket 句柄 */
struct sockaddr_in serv_addr /* 服务器地址 */
struct hostent *host_ent
int result = 0, send_len
char data_buf[HTTP_BUF_SIZE]
char host[HTTP_HOST_LEN] = "127.0.0.1"
unsigned short port = HTTP_DEF_PORT
unsigned long addr
char file_name[HTTP_HOST_LEN] = "index.html"
char file_nameforsave[HTTP_HOST_LEN] = "index1.html"
FILE *file_web
if (argc != 2)
{
printf("[Web] input : %s http://www.test.com[:8080]/index.html", argv[0])
return -1
}
http_parse_request_url(argv[1], host, &port, file_name)
WSAStartup(MAKEWORD(2,0), &wsa_data) /* 初始化 WinSock 资源 */
addr = inet_addr(host)
if (addr == INADDR_NONE)
{
host_ent = gethostbyname(host)
if (!host_ent)
{
printf("[Web] invalid host\n")
return -1
}
memcpy(&addr, host_ent->h_addr_list[0], host_ent->h_length)
}
/* 服务器地址 */
serv_addr.sin_family = AF_INET
serv_addr.sin_port = htons(port)
serv_addr.sin_addr.s_addr = addr
http_sock = socket(AF_INET, SOCK_STREAM, 0) /* 创建 socket */
result = connect(http_sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr))
if (result == SOCKET_ERROR) /* 连接失败 */
{
closesocket(http_sock)
printf("[Web] fail to connect, error = %d\n", WSAGetLastError())
return -1
}
/* 发送 HTTP 请求 */
send_len = sprintf(data_buf, http_req_hdr_tmpl, argv[1], host, port)
result = send(http_sock, data_buf, send_len, 0)
if (result == SOCKET_ERROR) /* 发送失败 */
{
printf("[Web] fail to send, error = %d\n", WSAGetLastError())
return -1
}
file_web = fopen(file_nameforsave, "a+")
do /* 接收响应并保存到文件中 */
{
result = recv(http_sock, data_buf, HTTP_BUF_SIZE, 0)
if (result > 0)
{
fwrite(data_buf, 1, result, file_web)
/* 在屏幕上输出 */
data_buf[result] = 0
printf("%s", data_buf)
}
} while(result > 0)
fclose(file_web)
closesocket(http_sock)
WSACleanup()
return 0
}
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祝愿你学习愉快~
问题补充:http://www.cyybase.com/
提问者: nser - 试用期 一级
最佳答案
c语言学习资料
1.C语言初学者入门讲座:http://www.hlib.cn/search.asp?keyword=C%D3%EF%D1%D4%B3%F5%D1%A7%D5%DF%C8%EB%C3%C5%BD%B2%D7%F9
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11.DOS游戏编程21条:http://www.hlib.cn/article/program/1528.asp
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