I need to download jpeg image and show it in my midlet.
But when I try to run this code, image on screen is broken.
What is wrong?
public void startApp() {
HttpConnection conn = null;
InputStream is = null;
try {
conn = (HttpConnection) Connector.open("http://av.li.ru/227/2374227_8677578.jpg", Connector.READ, false);
conn.setRequestMethod( HttpConnection.GET);
int rc = conn.getResponseCode();
if (rc != HttpConnection.HTTP_OK) {
throw new Exception("ResponseCode = " + rc);
}
is = conn.openDataInputStream();
byte []b = new byte[(int) conn.getLength()];
is.read(b);
Image img = Image.createImage(b, 0, b.length);
Form f = new Form("test");
f.append(img);
Display.getDisplay(this).setCurrent(f);
} catch (Exception e) {
}
}
Thanks
Related
I have tried to read IMB barcode from an image with the below code snippet, but it always return null. I have also tried with the IMB barcode images in the blackbox testing below, but doesn't work.
https://github.com/micjahn/ZXing.Net/tree/master/Source/test/data/blackbox/imb-1
private static void Decode()
{
Bitmap bitmap = new Bitmap(#"\07.png");
try
{
MemoryStream memoryStream = new MemoryStream();
bitmap.Save(memoryStream, ImageFormat.Bmp);
byte[] byteArray = memoryStream.GetBuffer();
ZXing.LuminanceSource source = new RGBLuminanceSource(byteArray, bitmap.Width, bitmap.Height);
var binarizer = new HybridBinarizer(source);
var binBitmap = new BinaryBitmap(binarizer);
IMBReader imbReader = new IMBReader();
Result str = imbReader.decode(binBitmap);
}
catch { }
}
I have solved this problem by using the below code snippet shared through the below link.
https://github.com/micjahn/ZXing.Net/issues/59
private static void Decode2()
{
var bitmap = new Bitmap(#"\07.png"); // make sure that the file exists at the root level
try
{
var imbReader = new BarcodeReader
{
Options =
{
PossibleFormats = new List<BarcodeFormat> {BarcodeFormat.IMB}
}
};
var result = imbReader.Decode(bitmap);
if (result != null)
System.Console.WriteLine(result.Text);
else
System.Console.WriteLine("nothing found");
}
catch (System.Exception exc)
{
System.Console.WriteLine(exc.ToString());
}
}
I am getting error width cannot be null , when passing image to inputstream.As i didn't find any alterante method . Basically i want to convert image to Pdf format in Xamarin.forms which supports UWP platform .
I am using xfinium pdf library for this.
public void ConvertJpegToPdf()
{
try
{
PdfFixedDocument document = new PdfFixedDocument();
Xfinium.Pdf.PdfPage page = document.Pages.Add();
page.Width = 800;
page.Height = 600;
var imageStream = GetStream();
PdfJpegImage jpeg = new PdfJpegImage(imageStream);//<-Error
PdfStandardFont helvetica = new PdfStandardFont(PdfStandardFontFace.Helvetica, 24);
PdfBrush brush = new PdfBrush(PdfRgbColor.Red);
page.Graphics.DrawImage(jpeg, 0, 0, page.Width, page.Height);
Stream pdfStream = null;
document.Save(pdfStream);
}
catch (Exception ex)
{
throw ex;
}
}
protected Stream GetStream()
{
byte[] byteArray = Encoding.UTF8.GetBytes("http://david.qservicesit.com/images/3.jpg");
MemoryStream stream = new MemoryStream(byteArray);
return stream;
}
Please suggest some alternate to do this
byte[] byteArray = Encoding.UTF8.GetBytes("http://david.qservicesit.com/images/3.jpg");
You could not get image stream in this way. The method you have used can only get the Bytes of string. For your scenario, you could use http client to acquire image stream. Please refer to the following code:
public async Task<Stream> GetStream()
{
HttpClient client = new HttpClient();
HttpResponseMessage res = await client.GetAsync(new Uri("http://david.qservicesit.com/images/3.jpg"));
Stream stream = await res.Content.ReadAsStreamAsync();
return stream;
}
public async Task ConvertJpegToPdf()
{
try
{
PdfFixedDocument document = new PdfFixedDocument();
Xfinium.Pdf.PdfPage page = document.Pages.Add();
page.Width = 800;
page.Height = 600;
var imageStream = await GetStream();
PdfJpegImage jpeg = new PdfJpegImage(imageStream);
PdfStandardFont helvetica = new PdfStandardFont(PdfStandardFontFace.Helvetica, 24);
PdfBrush brush = new PdfBrush(PdfRgbColor.Red);
page.Graphics.DrawImage(jpeg, 0, 0, page.Width, page.Height);
Stream pdfStream = new MemoryStream();
document.Save(pdfStream);
}
catch (Exception ex)
{
throw ex;
}
}
I am trying to stream video file . when i open the same video file in another tab of browser , i get the message "file is being used by another process" . if I use FileShare.ReadWrite in file.open method then error goes away but video doesn't play in browser . can someone pl. help .
public HttpResponseMessage Get([string id)
{
var path = HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings["path"] + "/" + id);
var video = new VideoStream(path);
HttpResponseMessage response = Request.CreateResponse();
var contentType = ConfigurationManager.AppSettings[Path.GetExtension(id)];
response.Content = new PushStreamContent(video.WriteToStream, new MediaTypeHeaderValue(contentType));
return response;
}
public class VideoStream
{
private readonly string _filename;
public VideoStream(string filename)
{
_filename = filename;
}
public async void WriteToStream(Stream outputStream, HttpContent content, TransportContext context)
{
try
{
var buffer = new byte[65536];
using (var video = File.Open(_filename, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite))
{
var length = (int) video.Length;
var bytesRead = 1;
while (length > 0 && bytesRead > 0)
{
bytesRead = video.Read(buffer, 0, Math.Min(length, buffer.Length));
await outputStream.WriteAsync(buffer, 0, bytesRead);
length -= bytesRead;
video.Flush();
}
}
}
catch (HttpException ex)
{
return;
}
finally
{
// outputStream.Close();
// outputStream.Flush();
}
}
}
You should use:
File.Open(name, FileMode.Open, FileAccess.Read, FileShare.Read);
Assuming the file lock comes from the server. Is that the case, or is it a client side thing?
I'm trying to implement an app of news (feedrss) by using WP7 i've tried this solution , but it does'nt work for me , here is my code :
namespace PhoneApp1
{
public partial class MainPage : PhoneApplicationPage
{
public MainPage()
{
InitializeComponent();}
private void Go_Click(object sender, RoutedEventArgs e)
{
WebClient _client = new WebClient();
_client.DownloadStringCompleted += Feed;
Location.Text = "http://www.aufaitmaroc.com/feeds/ma-vie.xml";
_client.DownloadStringAsync(new Uri((Location.Text)));
InitializeComponent();
}
private void Feed(object Sender, DownloadStringCompletedEventArgs e)
{
XElement _xml;
try
{
if (!e.Cancelled)
{
_xml = XElement.Parse(e.Result);
List<FeedItem> l = new List<FeedItem>();
foreach (XElement value in _xml.Elements("channel").Elements("item"))
{
FeedItem _item = new FeedItem();
_item.Title = value.Element("title").Value;
_item.enclosure = value.Element("enclosure").Attribute("url").Value;
_item.Description = Regex.Replace(value.Element("description").Value,
#"<(.|\n)*?>", String.Empty);
_item.Link = value.Element("link").Value;
_item.Guid = value.Element("guid").Value;
_item.Published = DateTime.Parse(value.Element("pubDate").Value);
l.Add(_item);
HttpWebRequest reqest1 = (HttpWebRequest)WebRequest.Create(_item.enclosure);
reqest1.BeginGetResponse(DownloadImageCallback, reqest1);
Thread.Sleep(1000);
WebClient client = new WebClient();
client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
client.OpenReadAsync(new Uri(_item.enclosure), client);
}
listBox.ItemsSource = l;
}
}
catch
{
}
}
IsolatedStorageFile MyStore = IsolatedStorageFile.GetUserStoreForApplication();
void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
var resInfo = new StreamResourceInfo(e.Result, null);
var reader = new StreamReader(resInfo.Stream);
byte[] contents;
using (BinaryReader bReader = new BinaryReader(reader.BaseStream))
{
contents = bReader.ReadBytes((int)reader.BaseStream.Length);
}
IsolatedStorageFileStream stream = MyStore.CreateFile("10.jpg");
stream.Write(contents, 0, contents.Length);
stream.Close();
}
void DownloadImageCallback(IAsyncResult result)
{
HttpWebRequest req1 = (HttpWebRequest)result.AsyncState;
HttpWebResponse responce = (HttpWebResponse)req1.EndGetResponse(result);
Stream s = responce.GetResponseStream();
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
string directory = "Imagestest";
if (!MyStore.DirectoryExists(directory))
{
MyStore.CreateDirectory(directory);
IsolatedStorageFileStream stream = MyStore.CreateFile("10.jpg");
using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
{
using (var isoFileStream = myIsolatedStorage.CreateFile(directory + "//ANALYSE_10052013095620.jpg"))
{
var bitimage = new BitmapImage();
var wb = new WriteableBitmap(bitimage);
var width = wb.PixelWidth;
var height = wb.PixelHeight;
// bitimage.SetSource = isoFileStream;
image1.Source = bitimage;
System.Windows.Media.Imaging.Extensions.SaveJpeg(wb, isoFileStream, width, height, 0, 100);
}
}
}
else
{
using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
{
if (myIsolatedStorage.FileExists(directory + "//ANALYSE_10052013095620.jpg"))
{
myIsolatedStorage.DeleteFile(directory + "//ANALYSE_10052013095620.jpg");
}
using (var isoFileStream = myIsolatedStorage.CreateFile(directory + "//ANALYSE_10052013095620.jpg"))
{
var bitimage = new BitmapImage();
var wb = new WriteableBitmap(bitimage);
var width = wb.PixelWidth;
var height = wb.PixelHeight;
System.Windows.Media.Imaging.Extensions.SaveJpeg(wb, isoFileStream, width, height, 0, 100);
}
}
}
});
}
private void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
FeedItem currentFeedItem = (FeedItem)listBox.SelectedItem;
PhoneApplicationService.Current.State["FeedItem"] = currentFeedItem;
}
When i run this project , nothing's happend , it does'nt create any folder ,when i stop the internet , images doesnt display anymore.
If you need image caching in your app, I can suggest JetImageLoader library for you
Features:
Caching in memory (so it will work very fast with lists, grids, etc)
Caching is IsolatedStorageFile (to prevent reloading each time)
Fully asynchronous (no lags)
Usage via XAML Binding Converter, you do not have to change your code, just declare converter for Image
But it supports only Windows Phone 8+
I am authour of that library, so if you got any questions, please write to me here or create an issue on github
If you want to save image locally and the display image from locally, then try this sample
http://code.msdn.microsoft.com/wpapps/CSWP8ImageFromIsolatedStora-8dcf8411, on WP 8 it's works fine.
Hy.
I do an application in WP7 which is connet a FTP server. I would like to upload a photo(with photochoosertask).
I wrote a PhotoChooserTask() which I could choose a photo. The program save the photo name(samplephoto01.jpg) and the photo route.
And I wrote a code which send command to FTP server:
public static void Execute(String msg)
{
SocketAsyncEventArgs socketEventArg = new SocketAsyncEventArgs();
Byte[] cmd = Encoding.UTF8.GetBytes((msg + "\r\n").ToCharArray());
socketEventArg.SetBuffer(cmd, 0, cmd.Length);
socket.SendAsync(socketEventArg);
}
This code i can chose the photo:
public void SelectAndUpLoad()
{
PhotoChooserTask p = new PhotoChooserTask();
p.Completed += new EventHandler<PhotoResult>(pt_Completed);
p.ShowCamera = true;
p.Show();
}
void pt_Completed(object sender, PhotoResult e)
{
if (e.TaskResult == TaskResult.OK)
{
BitmapImage img = new BitmapImage();
img.SetSource(e.ChosenPhoto);
MediaLibrary library = new MediaLibrary();
string PhotoPath = e.OriginalFileName;
// MessageBox.Show(PhotoPath);
for (int i = 0; i < library.Pictures.Count; i++)
{
Stream s = library.Pictures[i].GetImage();
if (s.Length == e.ChosenPhoto.Length)
{
string filename = library.Pictures[i].Name;
MessageBoxResult m = MessageBox.Show(filename, "Upload?", MessageBoxButton.OKCancel);
if (m == MessageBoxResult.OK)
{
Ftp.UploadFile(PhotoPath);
}
else
{
return;
}
break;
}
}
}
}
And this is the code whic i would like to upload the file:
public static void UploadFile(string file)
{
FileStream stream = new FileStream(file, FileMode.Open);
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
Execute("STRO " + file);
stream.Seek(0, SeekOrigin.Begin);
stream.Close();
}
But when i use the UploadFile(); method the program answer this:
MethodAccessException was unhandled
This code:
.
.
Ftp.UploadFile(PhotoPath);
}
else
{ //MethodAccessException
return;
}
break;
}
What was the wrong? Thank you!
I rewrote this code with IsolatedStorage to this:
for (int i = 0; i < library.Pictures.Count; i++)
{
Stream s = library.Pictures[i].GetImage();
if (s.Length == e.ChosenPhoto.Length)
{
string filename = library.Pictures[i].Name;
MessageBoxResult m = MessageBox.Show(filename, "Upload?", MessageBoxButton.OKCancel);
if (m == MessageBoxResult.OK)
{
IsolatedStorageFile iss = IsolatedStorageFile.GetUserStoreForApplication();
IsolatedStorageFileStream fs = iss.OpenFile(PhotoPath, FileMode.Open);
Ftp.UploadFile(fs, filename);
fs.Close();
}
else
{
return;
}
break;
}
}
And the UploadFile() method:
public static void UploadFile(IsolatedStorageFileStream file, string RemoteFile)
{
SocketAsyncEventArgs socketEventArg = new SocketAsyncEventArgs();
int bytes;
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
Execute("STRO " + RemoteFile);
file.Seek(0, SeekOrigin.Begin);
while ((bytes = file.Read(buffer, 0, buffer.Length)) > 0)
{
socketEventArg.SetBuffer(buffer, bytes, 0);
socket.SendAsync(socketEventArg);
}
}
But i get an exception in this source:
IsolatedStorageFileStream fs = iss.OpenFile(PhotoPath, FileMode.Open);
The exception is: IsolatedStorageException was unhadnled.
What is wrong?
I think your problem lies in the line:
FileStream stream = new FileStream(file, FileMode.Open);
You can't open files this way on WP7. To get a stream to a file, you can either open it from the Isolated Storage (given that the file is stored there), or use the stream provided by a built-in method.
In your case, you have the stream with the property e.ChosenPhoto. Why don't you use it directly?
public static void UploadFile(Stream stream, string file)
{
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
Execute("STRO " + file);
stream.Seek(0, SeekOrigin.Begin);
stream.Close();
}
Then call UploadFile using e.ChosenPhoto as the first argument.