Httpwebrequest upload file / Multipart POST

[spidertimo]

Hello,

I'm programming a tool to upload pictures to my facebook group. Posting text to the group works like a charm but I don't know how to upload pictures with httpwebrequest.

Can someone help?

Thank you!

 

[SlimProxies]

Hello,

I'm programming a tool to upload pictures to my facebook group. Posting text to the group works like a charm but I don't know how to upload pictures with httpwebrequest.

Can someone help?

Thank you!

What have you tried that didn't work? A simple google search shows up tons of results.

 

[MoneyIsTheGod]

What codes did you write to do it? Paste it here and maybe I can help.

 

[Macthetrix]

No one can help you if you dont give more details

 

[spidertimo]

I get this from HTTP-Liveheaders (I used an add-me page for testing):

sorry the source contains URLs and I'm not allowed to post URLs...

I found a code on the internet for uploading an image and edited it:



I get an error on this line at the end:
RequestStream.Close()


Error:
The request was aborted: The request was canceled ..


Can someone help me?

 

[Macthetrix]

Use Fiddler man and not some crappy chrome extension

 

[innosoft]

u need to change content type.

 

[spidertimo]

u need to change content type.

I added this line:

request.ContentType = "Content-Type: multipart/form-data; " & boundary2

but same error :/

 

[theMagicNumber]

HttpClient .NET 4 or above, has multipart post implemented.It still requires some tuning, but you don't have to deal with the post string directly.

1) Download fiddler -> http://www.telerik.com/fiddler
2) Upload a picture manually. You can create an empty file and rename the extension to *.jpeg - fiddler won't read the strings after the binary data, but with an empty file you will see the entire post data.
3) Mimic the headers and post data.
4) Profit.

 

[spidertimo]

I mimiced the headers and post data. Now all looks the same but the "image code". After this lines:

Content-Disposition: form-data; name="file1"; filename="156928_318983771550461_1084321640_n.jpg"
Content-Type: image/jpeg

it transfers this insteed of the image-bytes:

d�

any ideas?

 

[gtothem]

I'm also stuck trying to do this with httpwebrequest tweeting an image..

Here is what I've got: http://pastebin.com/8j6PXvGd

I compared that to firefox in fiddler and they both appear exactly the same yet this returns a 500 internal server error.

 

[Macthetrix]

export the fiddler file with the request and I will put it together for you

 

[gtothem]

Not sure which format to export http://www64.zippyshare.com/v/1915646/file.html

Hope the session file is okay.

 

[gtothem]

Okay so I just compared side-by-side in windows and on the textview I noticed the first line was empty for my program.

Basically I changed

Dim boundarybytes As Byte() = System.Text.Encoding.ASCII.GetBytes(vbCr & vbLf & "--" & boundary & vbCr & vbLf)

to

Dim boundarybytes As Byte() = System.Text.Encoding.ASCII.GetBytes("--" & boundary & vbCr & vbLf)

and now it works. To OP, look at my code with this change - I'm sure it'll work the same for facebook once the values are changed.

 

[spidertimo]