Jump to content
  • Advertisement
Sign in to follow this  

[.net] HttpWebResqust to post an image

This topic is 2909 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

Hi all,

I'm developing a PC application in VC++ .NET and I'm trying to publish a photo using HttpWebRequest. When trying to POST a photo, I get a 400 (Bad Request) error. I've been able to publish status updates, so I think the problem lies in how I'm trying to attach the image.

What I have so far (commented code reflects other ways I've tried):

[source lang=cpp]

String^ req = "https://graph.facebook.com/123456789/photos?access_token=" + access_code;
req += "&source=./Untitled-3.jpg";
req += "&message=HelloWorld";

array<unsigned char>^ cstr = System::IO::File::ReadAllBytes("C:\\ar3.jpg");
System::Text::UTF8Encoding^ utf8 = gcnew System::Text::UTF8Encoding;
array<Byte>^ encodedBytes = utf8->GetBytes( req->ToString() );
//String^ headerTemplate = "Content-Disposition: form-data; name=\"ar3.jpg\"; filename=\"C:\\ar3.jpg\"\r\n Content-Type: image/jpeg\r\n\r\n;Content-Transfer-Encoding: binary\r\n";
//array<Byte>^ hdr = utf8->GetBytes( headerTemplate->ToString() );

//String ^bdry = "--------";
array<Byte>^ bbytes = utf8->GetBytes( bdry->ToString() );

HttpWebRequest^ hwr = (HttpWebRequest^)HttpWebRequest::Create(req);

//hwr->ContentLength = encodedBytes->Length;
//hwr->ContentLength += hdr->Length;
//hwr->ContentLength += cstr->Length;

hwr->Method = "POST";
hwr->ContentType = "multipart/form-data";
hwr->UserAgent = "11112222333344444";

hwr->KeepAlive = true;

System::IO::Stream^ stream = hwr->GetRequestStream();
stream->Write(encodedBytes, 0, encodedBytes->Length);
//stream->Write(bbytes, 0, bbytes->Length);
//stream->Write(hdr, 0, hdr->Length);
stream->Write(cstr, 0, cstr->Length);
//stream->Write(bbytes, 0, bbytes->Length);

try {
WebResponse^ webResponse = hwr->GetResponse();

textBox1->Text = webResponse->ToString();
} catch(WebException^ e) {
textBox1->Text = e->ToString();

Like I said, this works for posting status updates, so I think it's how I'm attaching the image. Any thoughts?

Share this post

Link to post
Share on other sites
Sign in to follow this  

  • Advertisement

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

GameDev.net is your game development community. Create an account for your GameDev Portfolio and participate in the largest developer community in the games industry.

Sign me up!