C++实现Http Post请求

//头文件

#include <iostream>

#include <string>

#include <Winsock2.h>

using namespace std;

//函数声明

int request(char* hostname, char* api, char* parameters);

//方法调用

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])

{

    int nRetCode = 0;

    // initialize MFC and print and error on failure

    if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))

    {

        // TODO: change error code to suit your needs

        _tprintf(_T("Fatal Error: MFC initialization failed\n"));

        return 1;

    }

    

    request("reg.163.com", "http://reg.163.com/CheckUser.jsp", "test");

    return nRetCode;

}

//函数实现

int request(char* hostname, char* api, char* parameters)

{

    WSADATA WsaData;

    WSAStartup(0x0101, &WsaData);

    //初始化socket

    struct hostent* host_addr = gethostbyname(hostname);

    if (host_addr == NULL)

    {

        cout<<"Unable to locate host"<<endl;

        return -103;

    }

    sockaddr_in sin;

    sin.sin_family = AF_INET;

    sin.sin_port = htons((unsigned short)80);

    sin.sin_addr.s_addr = *((int*)*host_addr->h_addr_list);

    int sock = socket(AF_INET, SOCK_STREAM, 0);

    if (sock == -1)

    {

        return -100;

    }

    //建立连接

    if (connect(sock, (const struct sockaddr *)&sin, sizeof(sockaddr_in) ) == -1)

    {

        cout<<"connect failed"<<endl;

        return -101;

    }

    //初始化发送信息

    char send_str[2048] = {0};

    //头信息

    strcat(send_str, "POST ");

    strcat(send_str, api);

    strcat(send_str, " HTTP/1.1\r\n");

    strcat(send_str, "Host: ");

    strcat(send_str, hostname);

    strcat(send_str, "\r\n");

    strcat(send_str, "Connection: keep-alive\r\n");

    char content_header[100];

    sprintf(content_header,"Content-Length: %d\r\n", strlen(parameters));

    strcat(send_str, content_header);

    strcat(send_str, "Cache-Control: max-age=0\r\n");

    strcat(send_str, "Origin: http://www.hao123.com\r\n");

    strcat(send_str, "User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/15.0.849.0 Safari/535.1\r\n");

    strcat(send_str, "Content-Type: application/x-www-form-urlencoded\r\n");

    strcat(send_str, "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n");

    strcat(send_str, "Referer: http://www.hao123.com/\r\n");

    strcat(send_str, "Accept-Encoding: gzip,deflate,sdch\r\n");

    strcat(send_str, "Accept-Language: zh-CN,zh;q=0.8\r\n");

    //内容信息

    strcat(send_str, "\r\n");

    strcat(send_str, parameters);

    if (send(sock, send_str, strlen(send_str),0) == -1)

    {

        cout<<"send failed"<<endl;

        return -101;

    }

    //获取返回信息

    char recv_str[4096] = {0};

    if (recv(sock, recv_str, sizeof(recv_str), 0) == -1)

    {

        cout<<"recv failed"<<endl;

        return -101;

    }

    cout<<recv_str<<endl;

    WSACleanup( );

    return 0;

}