VC++ Post 方法 上传数据到web服务器

最近在做一个项目，需要与WEB服务器交互一些信息。其中一项就是文件的上传与下载。现来一个上传的代码

#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.....
");    
      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
",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
";    
    header +="Host: ";    
    header +=lpszServer;    
    header += "
";    
    header += "User-Agent: Mozilla/4.0
";    
    header += "Connection: Keep-Alive
";    
    header += "Accept: */*
";    
    header += "Pragma: no-cache
";    
    header += "Content-Type: multipart/form-data; charset="gb2312"; boundary=----------------------------64b23e4066ed
";    
    
    content += "------------------------------64b23e4066ed
";       
    content += "Content-Disposition: form-data; name="file"; filename="大论文和实验材料.rar"
";       
    content += "Content-Type: aapplication/octet-stream

";       
    
    //post尾时间戳    
    std::string strContent("
------------------------------64b23e4066ed
");    
    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

", 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.
");       
             break;       
         }       
         else if (nRet == SOCKET_ERROR)       
         {       
             printf("socket error
");       
             break;       
         }       
         else       
         {       
             printf("recv() returned %d bytes
", nRet);       
             printf("received: %s
", 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");    
} 

这是上传文件的C++代码

下面是用 asp.net写的服务端的接收数据的代码

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
");    
                }    
                catch    
                {    
                    Response.Write("Error
");    
                }    
                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"/>