Dev C++ Wininet Upload file using HTTP

Question

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

the complete C++ code can be find here

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

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\nContent-Disposition: form-data; name=\"uploadedfile\"; filename=\"C:\test.txt\"\nContent-Type: text/plain\n\nfile contents  here\n-----------------------------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", 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;
}

Answer 1

I was able to make your code work.

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"), ...

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].

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

Here is the string I have used.

static TCHAR frmdata[] = "-----------------------------7d82751e2bc0858\r\nContent-Disposition: form-data; name=\"uploadedfile\"; filename=\"C:\\test.txt\"\r\nContent-Type: text/plain\r\n\r\nfile contents  here\r\n-----------------------------7d82751e2bc0858--\r\n";

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.

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

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

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

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

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