I'm kind of new to Silverlight. I've managed to solve this problem for WPF, unfortunately not for Silverlight.
I open an image with an OpenFileDialog. I make a stream out of it and write it in a byte array. This byte array is then put into the database. This is the code I use to open the image and convert it into a byte array:
OpenFileDialog dlg = new OpenFileDialog();
dlg.InitialDirectory = #"C:\";
dlg.Filter = "Image File (*.jpg;*.bmp;*.gif)|*.jpg;*.bmp;*.gif";
dlg.FilterIndex = 1;
if(dlg.ShowDialog() == true)
{
pImage.Naam = dlg.File.Name;
BitmapImage bitImage = new BitmapImage();
Stream s = (Stream)dlg.File.OpenRead();
imgItem.Source = bitImage;
pImage.Data = new byte[s.Length];
s.Read(pImage.Data, 0, (int)s.Length);
s.Close();
}
I manage to save the byte array as a varbinary without any problem to my database.
When I retrieve it, I have no difficulties converting the varbinary back to the byte array (I'm pretty sure the two byte arrays are the same as when debugging I get exactly the same size).
But then I get stuck! Whenever I want to convert the byte array back to an image using the following code, my stream (and thus my image) is empty:
var newImage = new BitmapImage();
var myStream = new MemoryStream(pHuidigeImage.Data);
newImage.SetSource(myStream);
imgItem.Source = newImage;
So, what's wrong here?
Thanks in advance!
Related
I am doing html to pdf file . Its Downloading instantly . I dont want download instantly. i want to save the file in my project folder once converted.
My C# Code
string html ="<table><tr><td>some contents</td></tr></table>";
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment;filename=WelcomeLetter.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
StringReader sr = new StringReader(table);
Document ResultPDF = new Document(iTextSharp.text.PageSize.A4, 25, 10, 20, 30);
PdfPTable Headtable = new PdfPTable(7);
Headtable.TotalWidth = 525f;
Headtable.LockedWidth = true;
Headtable.HeaderRows = 5;
Headtable.FooterRows = 2;
Headtable.KeepTogether = true;
HTMLWorker htmlparser = new HTMLWorker(ResultPDF);
PdfWriter.GetInstance(ResultPDF, Response.OutputStream);
ResultPDF.Open();
htmlparser.Parse(sr);
ResultPDF.Close();
Response.Write(ResultPDF);
Response.End();
For saving pdf file locally in your project folder you can use FileStream class like this.
FileStream stream = new FileStream(filePath, FileMode.Create);//Here filePath is path of your project folder.
Now use this stream instead of using Response.OutputStream when you create instance of PdfWriter object.
PdfWriter.GetInstance(ResultPDF, stream);
Now do not use Responce.Write as you don't want to download your file.And close your stream at end.
stream.Close();
I'm going to combine everyone's answer into one that you should be able to drop in and use. If this works, I would accept Manish Parakhiya's answer because that had the most important part.
First, I'm going to assume you are using a recent version of iTextSharp. I think 5.5.5 is the most recent version. Second, because of this, I'm going to restructure your code a bit in order to use the using pattern. If you're stuck on an older obsolete unsupported version like 4.1.6 you'll need to re-adjust.
Almost every tutorial out there shows you that you can bind directly the Response.OutputStream. This is 100% valid but I would argue that it is also a really bad idea. Instead, bind to a more generic MemoryStream. This makes debugging much easier and your code will port and adapt that much easier.
The below code includes comments about each of the changes and what things are actually doing. The top section is all about creating a PDF from a string of HTML. The bottom actually does something with it, including writing it to disk and/or streaming it to a browser.
//Will hold our PDF eventually
Byte[] bytes;
//HTML that we want to parse
string html = "<table><tr><td>some contents</td></tr></table>";
//Create a MemoryStream to write our PDF to
using (var ms = new MemoryStream()) {
//Create our document abstraction
using (var ResultPDF = new Document(iTextSharp.text.PageSize.A4, 25, 10, 20, 30)) {
//Bind a writer to our Document abstraction and our stream
using (var writer = PdfWriter.GetInstance(ResultPDF, ms)) {
//Open the PDF for writing
ResultPDF.Open();
//Parse our HTML using the old, obsolete, not support parser
using (var sw = new StringWriter()) {
using (var hw = new HtmlTextWriter(sw)) {
using (var sr = new StringReader(html)) {
using (var htmlparser = new HTMLWorker(ResultPDF)) {
htmlparser.Parse(sr);
}
}
}
}
//Close the PDF
ResultPDF.Close();
}
}
//Grab the raw bytes of the PDF
bytes = ms.ToArray();
}
//At this point, the bytes variable holds a valid PDF file.
//You can write it disk:
System.IO.File.WriteAllBytes("your file path here", bytes);
//You can also send it to a browser:
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment;filename=WelcomeLetter.pdf");
Response.BinaryWrite(bytes);
Response.Cache.SetCacheability(HttpCacheability.NoCache);
//Never do the next line, it doesn't do what you think it does and actually produces corrupt PDFs
//Response.Write(ResultPDF); //BAD!!!!!!
Response.End();
string tempDirectory = Session.SessionID.ToString();
string location = Path.Combine(Server.MapPath(
WebConfigurationManager.AppSettings["PathSet"].ToString()), tempDirectory);
if (!Directory.Exists(location))
{
Directory.CreateDirectory(location);
}
string fileName="abc.pdf";
filePath = Path.Combine(location, fileName);
I'm here for a solution to a little unresolved problem. Maybe I haven't searched for the right things as I haven't found a solution and I hope you will be able to help.
So I have a WPF application where I load an image, here I have no problems. Next I have to add some points by clicking, so i have this function:
private void ClickMouse(object sender, MouseButtonEventArgs e)
{
Point p = e.GetPosition(this);
schema.PointFromScreen(p);
var myImage3 = new Image();
var bi3 = new BitmapImage();
bi3.BeginInit();
bi3.UriSource = new Uri(_clickImagePath, UriKind.Relative);
bi3.EndInit();
myImage3.Stretch = Stretch.Fill;
myImage3.Source = bi3;
myImage3.MinWidth = 30;
myImage3.MinHeight = 30;
myImage3.Width = 30;
myImage3.Height = 30;
myImage3.Name = _pointName;
var oMargin = new Thickness(p.X, p.Y, 0, 0);
myImage3.Margin = oMargin;
mainCanva.Children.Add(myImage3);
_listImg.Add(myImage3);
PointList.Items.Add(_pointName);
}
The problem is not here but I need a context.
Now on to the main problem. I have to save the final Image to make a PDF with. I use a piece of sample code I found here (http://stackoverflow.com/questions/1824989/how-to-store-system-windows-controls-image-to-local-disk) to convert to a jpg file using ITextsharp. The only thing I have on the PDF is the first picture, so I admitted that it probably take only the first image and not the other created images on it but I really don't know how to fix it. Does some fonction exist to make a kind of screenshot of the image zone? or maybe to pay attention to all image in the zone of the principal Control.Image ?
Thank you for your help.
You should use the following code to render your Canvas as an image :
var rect = new Rect(canvas.RenderSize);
var rtb = new RenderTargetBitmap((int)rect.Right, (int)rect.Bottom, 96d, 96d, System.Windows.Media.PixelFormats.Default);
rtb.Render(canvas);
//encode as PNG
varpngEncoder = new PngBitmapEncoder();
pngEncoder.Frames.Add(BitmapFrame.Create(rtb));
//save to memory stream
using(var ms = new System.IO.MemoryStream())
{
pngEncoder.Save(ms);
System.IO.File.WriteAllBytes("logo.png", ms.ToArray());
}
(Source : Write WPF output to image file )
I have a dynamically created Image control that is populated via a OpenFileDialog like:
OpenFileDialog dialog = new OpenFileDialog();
if (dialog.ShowDialog() == true)
{
using (FileStream stream = dialog.File.OpenRead())
{
BitmapImage bmp = new BitmapImage();
bmp.SetSource(stream);
myImage.Source = bmp;
}
}
I want to send the image back to the server in a separate function call, as string via a web service.
How do I get a memory stream / base64 string from myImage.Source
Here's an alternative which should work (without BmpBitmapEncoder). It's uses the FileStream stream to create the byte array that is then converted to a Base64 string. This assumes you want to do this within the scope of the current code.
Byte[] bytes = new Byte[stream.Length];
stream.Read(bytes, 0, bytes.Length);
return Convert.ToBase64String(bytes);
Make sure you have http://imagetools.codeplex.com/
Then you can do this:
ImageSource myStartImage;
var image = ((WriteableBitmap) myStartImage).ToImage();
var encoder = new PngEncoder( false );
MemoryStream stream = new MemoryStream();
encoder.Encode( image, stream );
var myStartImageByteStream = stream.GetBuffer();
Then for Base64:
string encodedData = Convert.ToBase64String(myStartImageByteStream);
I want to read the raw binary of a PNG file on a website and store it into a byte[], so far I have something like this:
Uri imageUri = new Uri("http://www.example.com/image.png");
// Create a HttpWebrequest object to the desired URL.
HttpWebRequest imgRequest = (HttpWebRequest)WebRequest.Create(imageUri);
using (HttpWebResponse imgResponse = (HttpWebResponse)imgRequest.GetResponse())
{
using (BinaryReader lxBR = new BinaryReader(imgResponse.GetResponseStream()))
{
using (MemoryStream lxMS = new MemoryStream())
{
lnBuffer = lxBR.ReadBytes(1024);
while (lnBuffer.Length > 0)
{
lxMS.Write(lnBuffer, 0, lnBuffer.Length);
lnBuffer = lxBR.ReadBytes(1024);
}
lnFile = new byte[(int)lxMS.Length];
lxMS.Position = 0;
lxMS.Read(lnFile, 0, lnFile.Length);
}
}
}
but I can't use GetResponse on Silverlight because it is not Asynchronous (I think that's the reason) so instead I should be using BeginGetResponse, but I'm not completely clear on how to go about it. This is what I have so far:
HttpWebResponse imgResponse = (HttpWebResponse)imgRequest.BeginGetResponse(new AsyncCallback(WebComplete), imgRequest);
using (imgResponse)
{
using (BinaryReader lxBR = new BinaryReader(imgResponse.GetResponseStream()))
{
/*Same*/
}
}
and
void WebComplete(IAsyncResult a)
{
HttpWebRequest req = (HttpWebRequest)a.AsyncState;
HttpWebResponse res = (HttpWebResponse)req.EndGetResponse(a);
//...? Do I need something else here?
}
can someone explain me a little bit how to use the BeginGetResponse property and how do I use the AsyncCallback.
Thanks!
Note:
I'm new to silverlight and I've been following tutorials and borrowing from other responses here on StackOverflow:
(stackoverflow responce) what I need to do but not in silverlight
tutorial
WebRequest_in_Silverlight
is this valid Silverlight code?
HttpWebResponse imgResponse = (HttpWebResponse)imgRequest.BeginGetResponse(new AsyncCallback(WebComplete), imgRequest);
Got it working, want to post it here in case anyone needs it.
I need to get this image and then modify it (byte level) Silverlight didn't let me save the image directly to a WriteableBitmap and thus I had to get the image with a WebClient as a stream and then save it to a byte[]
this is how I get the image (I already have the specific Uri):
WebClient wc = new WebClient();
wc.OpenReadCompleted += new OpenReadCompletedEventHandler(wc_OpenReadCompleted);
wc.OpenReadAsync(uri)
so when the image is loaded the wc_OpenReadCompleted method is called and it does something like this:
int lengthInBytes = Convert.ToInt32(e.Result.Length);
BinaryReader br = new BinaryReader(e.Result);
byte[] buffer = new byte[lengthInBytes];
using (br)
{
for (int i = 0; i < lengthInBytes; i++)
{
buffer[i] = br.ReadByte();
}
}
at the end the buffer[] has all the bytes of the image (what I wanted)
I'm sure there are better ways of doing this but this is working for me ! )
note: at some point I need to convert the byte[] to a BitmapImage (that was easier than expected):
//imageInBytes is a byte[]
if (imageInBytes != null)
{
MemoryStream rawBytesStream = new MemoryStream(imageInBytes);
BitmapImage img = new BitmapImage();
img.SetSource(rawBytesStream);
return img;
}
I hope this helps anyone.
Use the OpenReadAsync method of the WebClient object. Attach to the OpenReadCompleted event of the WebClient. Use the Stream provided by the Result property of the event args.
Consider setting AllowReadStreamBuffering, this will fill the entire stream before raising the OpenReadCompleted. In either case its likely you can use this stream to complete you real task rather than coping it into a MemoryStream.
I am currently using sockets to try and send messages between a Silverlight 3 client and a .NET3.5 service. I can set up the TCP connection fine, and send data across, but my issue comes with serialising and deserialising DataContracts.
Currently we are using WCF PollingDuplex binding to do this work, but we are not happy with its performance, so are trying sockets, whilst still attempting to make use of DataContract attributes. The code I have is as follows:
// Client
public void Send(ActionMessage actionMessage)
{
DataContractSerializer dcs =
new DataContractSerializer(actionMessage.GetType());
MemoryStream memoryStream = new MemoryStream();
dcs.WriteObject(memoryStream, actionMessage);
byte[] sendBuffer = new byte[4096];
memoryStream.Position = 0;
memoryStream.Read(sendBuffer, 0, sendBuffer.Length);
SocketAsyncEventArgs socketAsyncEventArgs = new SocketAsyncEventArgs();
socketAsyncEventArgs.SetBuffer(sendBuffer, 0, sendBuffer.Length);
if(!_socket.SendAsync(socketAsyncEventArgs))
HandleSendComplete(socketAsyncEventArgs);
}
// Service
private byte[] _recieveBuffer = new byte[4096];
private int _receivedLength;
private void socket_OnReceiveComplete(IAsyncResult asyncResult)
{
_receivedLength += _tcpClient.Client.EndReceive(asyncResult);
// See if there's more data that we need to grab
if (_receivedLength < _recieveBuffer.Length)
{
// Need to grab more data so receive remaining data
_tcpClient.Client.BeginReceive(_recieveBuffer, _receivedLength,
_recieveBuffer.Length - _receivedLength, SocketFlags.None,
new AsyncCallback(socket_OnReceiveComplete), null);
return;
}
MemoryStream memoryStream = new MemoryStream();
memoryStream.Position = 0;
memoryStream.Write(_recieveBuffer, 0, _recieveBuffer.Length);
DataContractSerializer dcs = new DataContractSerializer(typeof(ActionMessage));
object o = dcs.ReadObject(memoryStream);
ActionMessage actionMessage = (ActionMessage) o;
}
It is the ReadObject line that throws the XmlException: Unexpected End of File. I have tried various things including truncating trailing 0's from the byte array (_recieveBuffer) when it is received, leaving just one 0 at the end etc, but nothing seems to work. I have checked the byte[] buffers on the client and the server side and they have the same values at the beginning and end and are of the same length. I have also tried using actionMessage.GetType() and typeof(ActionMessage) as parameters to the DataContractSerializer, but there is no difference...
What am I misssing here: why does dataContractSerializer.Write() not accept the output generated by dataContractSerializer.Read() ?
I was having a good day until hitting this...I did find one other guy with the same problem, but the solution offered, to set memoryStream.Position = 0 on the service side did not work...
Thanks in advance.
If I had to guess, I would say that your memoryStream.Position = 0; line is in the wrong place.
You will need to reset position in the stream after writing the buffer into the stream.