uploading image and php POST method in windows phone - php

Question

this is my first post. please be kind :)
i'm trying to get picture from media library (in WP 7), upload it using httpwebrequest, and save it to folder in the server. i succeed to convert the image to string of byte (but i suspect there are something wrong here), send the string using POST, and retrieve it in my php web page.
Everything seems to be working well, but when i convert the string of byte to jpeg (using imagecreatefromstring function) it always come up empty picture. here is my code in C# and php. I'm sorry for my English if it's not perfect (or far from perfect) :)
this is my c# code along with some comments
public partial class MainPage : PhoneApplicationPage
{
string uploadUri = #"http://192.168.138.1/meeshot/upload.php"; //php web page for retrieve and saving file in the server
string requestImageName = "picture"; //variable name for post ---- >$_POST['picture']
string postdata; //byte data generate using BitmapToByte function
// Constructor
public MainPage()
{
InitializeComponent();
}
PhotoChooserTask selectphoto = null;
Image image1 = new Image ();
private void button1_Click(object sender, RoutedEventArgs e) //user choosing photo from media library
{
selectphoto = new PhotoChooserTask();
selectphoto.Completed += new EventHandler<PhotoResult>(selectphoto_Completed);
selectphoto.Show();
}
void selectphoto_Completed(object sender, PhotoResult e)
{
if (e.TaskResult == TaskResult.OK)
{
BinaryReader reader = new BinaryReader(e.ChosenPhoto);
image1.Source = new BitmapImage(new Uri(e.OriginalFileName));
HttpWebRequest req = HttpWebRequest.Create(
new Uri(this.uploadUri)) as HttpWebRequest;
postdata = BitmapToByte(image1); //convert image to byte. My suspisicion there is something wrong here
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.BeginGetRequestStream(HttpWebRequestButton2_RequestCallback, req);
}
}
private void HttpWebRequestButton2_RequestCallback(IAsyncResult result)
{
var req = result.AsyncState as HttpWebRequest;
using (var requestStream = req.EndGetRequestStream(result))
{
using (StreamWriter writer = new StreamWriter(requestStream))
{
writer.Write(requestImageName+"="+this.postdata); //writing "picture=bytedata"
writer.Flush();
}
}
req.BeginGetResponse(HttpWebRequestButton_Callback, req);
}
private void HttpWebRequestButton_Callback(IAsyncResult result)
{
var req = result.AsyncState as HttpWebRequest;
var resp = req.EndGetResponse(result);
var strm = resp.GetResponseStream();
var reader = new StreamReader(strm);
this.Dispatcher.BeginInvoke(() => {
this.DownloadedText.Text = reader.ReadToEnd(); //the web page will print byte data that has been sent using httpwebrequest. i can see that byte data has benn sent sucessfuly.
this.DownloadedText.Visibility = System.Windows.Visibility.Visible;
});
}
private Stream ImageToStream(Image image1)
{
WriteableBitmap wb = new WriteableBitmap(400, 400);
wb.Render(image1, new TranslateTransform { X = 400, Y = 400 });
wb.Invalidate();
Stream myStream = new MemoryStream();
wb.SaveJpeg(myStream, 400, 400, 0, 70);
return myStream;
}
private string BitmapToByte(Image image) //i suspect there is something wrong here
{
Stream photoStream = ImageToStream(image);
BitmapImage bimg = new BitmapImage();
bimg.SetSource(photoStream); //photoStream is a stream containing data for a photo
byte[] bytearray = null;
using (MemoryStream ms = new MemoryStream())
{
WriteableBitmap wbitmp = new WriteableBitmap(bimg);
wbitmp.SaveJpeg(ms, wbitmp.PixelWidth, wbitmp.PixelHeight, 0, 100);
ms.Seek(0, SeekOrigin.Begin);
bytearray = ms.GetBuffer();
}
string str = Convert.ToBase64String(bytearray);
return str;
}
and this is my code in php web page
if(isset($_REQUEST['picture'])) //check
{
$myFile = "picture.jpg";
$fh = fopen($myFile, 'wb') or die("can't open file");
$stringData = $_REQUEST['picture']."<br>";
$im = imagecreatefromstring($stringData);
if ($im) {
imagejpeg($im);
fwrite($fh, $im);
imagedestroy($im);
}
fclose($fh);
echo $stringData;
}

Answer 1

Please look at my question here: Photo upload with parameters to a PHP page
And my solution here: http://nediml.wordpress.com/2012/05/10/uploading-files-to-remote-server-with-multiple-parameters/