I am doing integration salesforce with facebook . After authentication i want to upload photo on facebook i made one visualforce page in which i select photo and pass to controller as a blob.
My code is------
public void uploadPhoto()
       {
           
             String bodyEncoded = EncodingUtil.base64Encode(file);
             System.debug('------------------------------------------'+bodyEncoded);
             // bodyEncoded='%7B'+bodyEncoded+'%7D';
           
             String boundary = '----WebKitFormBoundaryE19zNvXGzXaLvS5C'; 
            // String message=''

             String body=boundary + '\r\n'+
            'Content-Disposition : form-data; name="source"; filename="'+filename+'"\r\n'+
            'Content-Type : '+filetype+'\r\n'+
             bodyEncoded +'\r\n' +
             boundary;
        
       
            System.debug('----------------------------------body is-------------\n'+body);
            HttpRequest req=new HttpRequest();
            req.setMethod('POST');
            req.setbody(body);
       
            req.setHeader('Content-Type', 'multipart/form-data; boundary="'+boundary+'"');
            req.setHeader('Content-length', String.valueOf(body.length()));
           // req.setHeader('Content-Encoding','base64');
            req.setEndpoint('https://graph.facebook.com/v2.0/me/photos?access_token='+accesstoken);
            HttpResponse res = null;
            http h= new Http();
            res= h.send(req);   
            system.debug( '------------upload photo----------------------'+res.getbody());   
       }
I am gettung error each time ({"error":{"message":"(#324) Requires upload file","type":"OAuthException","code":324}})
please tell me sir what i have to do for uploading photo on facebook.
thanks in advance