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.....
");
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");
}
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
");
}
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"/>
这里的maxRequestLength即是默认的上传文件大小，单位是KB。