vc++ socket http协议post方法上传 分块上传

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最近项目需要，通过C++客户端向Web服务器用http协议上传文件，网上介绍这方面的好像很少，所以做了个基础的发上来供学习交流；
本人学c++没几天，代码可能比较烂，大家凑合看吧。。
示例代码：
1、C++ Clinet
[cpp] view plaincopy
#include "stdio.h"
#include "WinSock2.h"
#include "iostream"
using namespace std;
#pragma comment(lib,"ws2_32.lib")
long l_file_len;
//获取文件内容
bool file_con(char **buffer,LPCSTR file)
{
  FILE *fp = fopen(file, "rb");
  if(fp==NULL)
  {
      printf("文件上传失败，请检查文件路径.....\n");
      return false;
  }
  fseek(fp, 0, SEEK_END);
  l_file_len = ftell(fp);
  rewind(fp);     

  *buffer = new char[l_file_len + 1];
  memset(*buffer, 0, l_file_len + 1);
  fseek(fp, 0, SEEK_SET);
  fread(*buffer, sizeof(char), l_file_len, fp);
  fclose(fp);
  return true;
}  

//文件上传
std::string upload(LPCSTR lpszServer,LPCSTR lpszAddr,LPCSTR fileUrl)
{
    char *file = NULL;
    if(!file_con(&file,fileUrl))
    {
         return "0";
    }
    SOCKET sock = ::socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (sock == INVALID_SOCKET)
    return "0";
    SOCKADDR_IN server;
    server.sin_family = AF_INET;
    server.sin_port = htons(80);
    struct hostent *host_addr = gethostbyname(lpszServer);
    if (host_addr == NULL)
    return "host_addr == NULL";
    server.sin_addr.s_addr = *((int *) *host_addr->h_addr_list);
    if (::connect(sock, (SOCKADDR *) &server, sizeof(SOCKADDR_IN)) == SOCKET_ERROR)
    {
        ::closesocket(sock);
        return "0";
    }
    printf("ip address = %s, port = %d\n",inet_ntoa(server.sin_addr), ntohs(server.sin_port));     

    std::string header("");
    std::string content("");
//----------------------post头开始--------------------------------
    header +="post ";
    header +=lpszAddr;
    header +=" HTTP/1.1\r\n";
    header +="Host: ";
    header +=lpszServer;
    header += "\r\n";
    header += "User-Agent: Mozilla/4.0\r\n";
    header += "Connection: Keep-Alive\r\n";
    header += "Accept: */*\r\n";
    header += "Pragma: no-cache\r\n";
    header += "Content-Type: multipart/form-data; charset=\"gb2312\"; boundary=----------------------------64b23e4066ed\r\n";  

    content += "------------------------------64b23e4066ed\r\n";
    content += "Content-Disposition: form-data; name=\"file\"; filename=\"大论文和实验材料.rar\"\r\n";
    content += "Content-Type: aapplication/octet-stream\r\n\r\n";     

    //post尾时间戳
    std::string strContent("\r\n------------------------------64b23e4066ed\r\n");
    char temp[64] = {0};
    //注意下面这个参数Content-Length，这个参数值是：http请求头长度+请求尾长度+文件总长度
    sprintf(temp, "Content-Length: %d\r\n\r\n", content.length()+l_file_len+strContent.length());
    header += temp;
    std::string str_http_request;
    str_http_request.append(header).append(content);
//----------------------post头结束-----------------------------------
    //发送post头
    send(sock, str_http_request.c_str(), str_http_request.length(), 0);   

    char fBuff[4096];
    int nPacketBufferSize = 4096; // 每个数据包存放文件的buffer大小
    int nStart;//记录post初始位置
    int nSize;//记录剩余文件大小
    // 就分块传送
    for (int i = 0; i < l_file_len; i += nPacketBufferSize)
    {
        nStart=i;
        if (i + nPacketBufferSize + 1> l_file_len)
        {
            nSize = l_file_len - i;
        }
        else
        {
            nSize = nPacketBufferSize;
        }  

        memcpy(fBuff, file + nStart, nSize);
        ::send(sock, fBuff, nSize, 0);
        Sleep(0.2);
    }  

    ::send(sock,strContent.c_str(),strContent.length(),0);  

    char szBuffer[1024] = {0};
    while (true)
    {  

         int nRet = ::recv(sock, szBuffer, sizeof(szBuffer), 0);
         if (nRet == 0 || nRet == WSAECONNRESET)
         {
             printf("Connection Closed.\n");
             break;
         }
         else if (nRet == SOCKET_ERROR)
         {
             printf("socket error\n");
             break;
         }
         else
         {
             printf("recv() returned %d bytes\n", nRet);
             printf("received: %s\n", szBuffer);
             break;
         }
    }
    ::closesocket(sock);
    delete [] file;
    return szBuffer;
}
void main()
{
    WORD wVersionRequested=MAKEWORD(2,2);
    WSADATA wsaData;
    if(WSAStartup(wVersionRequested,&wsaData))
    {
        cout<<"加载错误"<<endl;
    }
    if(LOBYTE(wsaData.wVersion)!=2||HIBYTE(wsaData.wHighVersion)!=2)
    {
        cout<<"WinSock‘s 加载错误"<<endl;
    }
    upload("localhost","/WebApplication1/Default.aspx","F:\\postgresql-8.3.3-2.rar");
}
2、Web Server
[csharp] view plaincopy
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Text;  

namespace WebApplication1
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Request.Files.Count > 0)
            {
                try
                {
                    HttpPostedFile file = Request.Files[0];
                    string filePath = Request.PhysicalApplicationPath + file.FileName;
                    file.SaveAs(filePath);
                    Response.Write("Success\r\n");
                }
                catch
                {
                    Response.Write("Error\r\n");
                }
                Response.End();
            }
        }
    }
}  

上面就是简单的代码示例，web需配置iis，相信大家知道怎么做^_^，还有一点就是web程序默认上传文件的限制，默认上传大小为4M，所以需要
在web.config中设置以下参数：
[html] view plaincopy
<httpRuntime maxRequestLength="951200" appRequestQueueLimit="60" executionTimeout="60"/>  

这里的maxRequestLength即是默认的上传文件大小，单位是KB。

再分享一下我老师大神的人工智能教程吧。零基础！通俗易懂！风趣幽默！还带黄段子！希望你也加入到我们人工智能的队伍中来！http://www.captainbed.net

原文地址：https://www.cnblogs.com/sjwudhwhhw/p/10509757.html