Dev C++ Wininet 使用 HTTP 上传文件

2022-01-09 00:00:00 file http upload c++ wininet

我想上传C: est.txt"到网络服务器，当我运行程序时，文件没有上传，我没有收到任何错误.

I want to upload "C: est.txt" to webserver, when I am running program, file is not uploading and I am not getting any error.

完整的C++代码可以在这里找到

网络服务器上的 php 代码可以在这里找到:"http://student114.110mb.com/上传.txt"或者"http://student114.110mb.com/upload.php"

and php code on webserver can be find here: "http://student114.110mb.com/upload.txt" or "http://student114.110mb.com/upload.php"

请在我做错的地方帮助我

kindly help me where I am doing wrong

#include <windows.h>
#include <wininet.h>
#include <tchar.h>
#include <iostream>

#pragma comment(lib,"wininet.lib")

using namespace std;

int main()
{

    static TCHAR frmdata[] = "-----------------------------7d82751e2bc0858
Content-Disposition: form-data; name="uploadedfile"; filename="C:	est.txt"
Content-Type: text/plain

file contents  here
-----------------------------7d82751e2bc0858--"; 
    static TCHAR hdrs[] = "Content-Type: multipart/form-data; boundary=---------------------------7d82751e2bc0858"; 

    HINTERNET hSession = InternetOpen("MyAgent",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
     if(hSession==NULL)
    {
     cout<<"Error: InternetOpen";  
    }


    HINTERNET hConnect = InternetConnect(hSession, _T("localhost"),INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1);
     if(hConnect==NULL)
    {
     cout<<"Error: InternetConnect";  
    }

    HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",_T("upload.php"), NULL, NULL, (const char**)"*/*", 0, 1);
    if(hRequest==NULL)
    {
     cout<<"Error: HttpOpenRequest";  
    }

    BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), frmdata, strlen(frmdata));
    if(!sent)
    {
     cout<<"Error: HttpSendRequest";
     }

    //close any valid internet-handles
    InternetCloseHandle(hSession);
    InternetCloseHandle(hConnect);
    InternetCloseHandle(hRequest);

    return 0;
}

推荐答案

我能够让你的代码工作.

I was able to make your code work.

首先你提供的链接上的代码和你发布的代码不一样:

First of all the code on the link you provided and the code you posted is not the same:

InternetConnect(hSession, _T("localhost"), ...
InternetConnect(hSession, _T("http://student114.110mb.com"), ...

您必须在此处传递主机名或 IP 地址，因此localhost"很好，但http://student114.110mb.com" 不是.如果您传递 URL，您将收到 12005 错误代码 [请参阅 msdn 上的 WinINet 错误代码].

You must pass an host name or ip address here so "localhost" is good but "http://student114.110mb.com" isn't. If you pass an URL you will get the 12005 error code [see WinINet error codes on msdn].

另一个问题是 frmdata 字符串.您应该将 C: est.txt 中的反斜杠加倍，否则您将在字符串中得到一个制表符 .分隔符前后的 也应替换为 ，因为 RFC 1521 和大多数其他 Internet 协议使用 CRLF 作为行分隔符.

Another problem is the frmdata string. You should double the backslash in C: est.txt or you will get a tab character in your string. The before and after the delimiters should also be replaced by because RFC 1521 and most other internet protocols use CRLF as a line delimiter.

这是我使用的字符串.

static TCHAR frmdata[] = "-----------------------------7d82751e2bc0858
Content-Disposition: form-data; name="uploadedfile"; filename="C:\test.txt"
Content-Type: text/plain

file contents  here
-----------------------------7d82751e2bc0858--
";

最后，PHP 代码不起作用，因为您在应该使用 $_FILES["uploadedfile"] 的地方使用了 $_FILES["file"].uploadedfile"通常对应于 <input type="file"> 的名称.HTML 中的标记，但在您的情况下，它是在 frmdata[] 字符串的 name= 参数中指定的.

Finally the PHP code doesn't work because you use $_FILES["file"] where you should be using $_FILES["uploadedfile"]. "uploadedfile" would typically correspond to the name of an <input type="file"> tag in HTML but in your case it is specified in the name= parameter of the frmdata[] string.

这是我用来测试的 PHP 代码

Here's the PHP code I have used to test this

move_uploaded_file($_FILES["uploadedfile"]["tmp_name"], "/files/my_file");

当您处理像这样复杂的客户端/服务器交互时，单独测试每个部分会有所帮助.例如，你可以.

When you work on complex client/server interaction like this it helps to test each part separately. You could for instance.

  • 写一个简单的 HTML 上传表单到测试你的 php 脚本

  • Write a simple HTML upload form to test your php script

让您的程序将其请求发送到netcat 并检查输出

Have your program send its request to netcat and examine the output

相关文章