i am saving the image in database. .. but how to retrieve that image from database .. when i try to use system.drawing .. it shows an error .. some of ppl saying i can't use system.drwaing in wpf .. not even dll file ..
my code is
private void btnShow_Click(object sender, RoutedEventArgs e)
{
DataTable dt2 = reqBll.SelectImage().Tables[0];
byte[] data = (byte[])dt2.Rows[0][1];
MemoryStream strm = new MemoryStream();
strm.Write(data, 0, data.Length);
strm.Position = 0;
System.Drawing.Image img = System.Drawing.Image.FromStream(strm);
BitmapImage bi = new BitmapImage();
bi.BeginInit();
MemoryStream ms = new MemoryStream();
img.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
ms.Seek(0, SeekOrigin.Begin);
bi.StreamSource = ms;
bi.EndInit();
ImgBox.Source = bi;
}
what to do now?
i used the system.drawing.dll .. now i can use system.drawing.bitmap .. but after using it shows an error at System.Drawing.Image.FromStream(strm);
error:- argument exception was unhandled by user code
Parameter is not valid.
You can use the classes in the System.Drawing namespace, but you will have to add a reference to the assembly containing the class you're interested in, by right clicking on the project, and choosing the "Add Reference..." option
Your code is fine as far as the drawing part is concerned, the problem is probably with the image data you are trying to load from the database (might be caused by mismatched data format or choosing the wrong column etc.). You might want to share the code that saves the image to the database, since there is no way to know without it.
This code sample does what you want (I commented out the database related part and substituted it with file loading):
private void btnShow_Click(object sender, RoutedEventArgs e)
{
// DataTable dt2 = reqBll.SelectImage().Tables[0];
// byte[] data = (byte[]) dt2.Rows[0][1];
// MemoryStream strm = new MemoryStream();
// strm.Write(data, 0, data.Length);
System.Drawing.Image bmp = System.Drawing.Bitmap.FromFile(#"C:\Temp\test.png");
MemoryStream strm = new MemoryStream();
bmp.Save(strm, System.Drawing.Imaging.ImageFormat.Bmp);
strm.Position = 0;
System.Drawing.Image img = System.Drawing.Image.FromStream(strm);
BitmapImage bi = new BitmapImage();
bi.BeginInit();
MemoryStream ms = new MemoryStream();
img.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
ms.Seek(0, SeekOrigin.Begin);
bi.StreamSource = ms;
bi.EndInit();
imgBox.Source = bi;
}
With that said, if this is a new application, using WPF solely is preferable to mixing Windows Forms and WPF classes and elements (as Jeff Mercado pointed out).
Related
am having a problem when i attempt to update a Record image in the DB.
the workflow am using goes as follows :
the user loads the image to a picture box using FilaDialog.
DialogResult path = openFileDialog1.ShowDialog();
if (path == DialogResult.OK)
{
pictureBox.Image = new Bitmap(openFileDialog1.FileName);
pictureBox.Refresh();
}
after the user finishes inserting the remaining fields and attempts to save the Image is loaded from the PictureBox and saved to the db.
Image img = PictureBox.Image;
byte[] photo_aray = null;
using (MemoryStream ms = new MemoryStream())
{
img.Save(ms, ImageFormat.Jpeg);
photo_aray = new byte[ms.Length];
ms.Position = 0;
ms.Read(photo_aray, 0, photo_aray.Length);
}
so far so good, but the problem occurs when i attempt to update the Image which follows as such :
the user selects the Record from a list, an event loads Record information, image is loaded to a PictureBox.
after the user finishes updating the remaining fields and attempts to save the Image is loaded from the PictureBox and saved to the db using the same logic written above with some changes to the SQL query.
Image img = PictureBox.Image;
byte[] photo_aray = null;
using (MemoryStream ms = new MemoryStream())
{
img.Save(ms, ImageFormat.Jpeg); // BREAKING POINT
photo_aray = new byte[ms.Length];
ms.Position = 0;
ms.Read(photo_aray, 0, photo_aray.Length);
}
Every time the user attempts to update, the following error message is shown :
A generic error occurred in GDI+.:: at System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder, EncoderParameters encoderParams)
at System.Drawing.Image.Save(Stream stream, ImageFormat format)
note that if the user changes the image or simply choose the same image using the Filedialog no error occurs.
any help is appreciated.
****** EDIT #1 *********
just to clarify,
records are first loaded from the database into RecordsList object which is bound to a List.
when a user selects a certain record, the Image is loaded from the Selected Record to the PictureBox.
if no changes are made to the picture , the image is loaded from picturebox to the logic explained above.
Thanks to Mr. #Jimi , I've managed to solve the issue.
as he so kindly pointed out, i need to dispose of the Memory stream after saving the object.
so my code was edited like this :
Image img = PictureBox.Image;
byte[] photo_aray = null;
MemoryStream ms = new MemoryStream();
img.Save(ms, ImageFormat.Jpeg);
photo_aray = new byte[ms.Length];
ms.Position = 0;
ms.Read(photo_aray, 0, photo_aray.Length);
//
//
//SQL UPDATE HERE
//
//
ms.Close();
ms.Dispose();
Thanks!
The Goal:
I want to convert an ImageBrush to a byte[].
Why?:
Because I want to print out the image, but I can't create any UI elements besides something like a MessageBox. SO I found an online tool that takes in a byte array and produces an image.
How do I do this in C# (WPF)?
What I've tried so far:
I have already converted the ImageBrush to a BitmapSource as so:
BitmapSource src = (BitmapSource)imageBrush.ImageSource;
and have converted the BitmapSource to a Bitmap Image as so:
private BitmapImage BitmapSourceToBitmapImage(BitmapSource bmpSrc)
{
JpegBitmapEncoder encoder = new JpegBitmapEncoder();
MemoryStream memoryStream = new MemoryStream();
BitmapImage bImg = new BitmapImage();
encoder.Frames.Add(BitmapFrame.Create(bmpSrc));
encoder.Save(memoryStream);
memoryStream.Position = 0;
bImg.BeginInit();
bImg.StreamSource = memoryStream;
bImg.EndInit();
memoryStream.Close();
return bImg;
}
But for the life of me I cannot get this BitmapImage to a byte array! I have tried this:
private byte[] BitmapImagetoByteArray(BitmapImage bitmapImage) {
byte[] data;
JpegBitmapEncoder encoder = new JpegBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bitmapImage));
using(MemoryStream ms = new MemoryStream())
{
encoder.Save(ms);
data = ms.ToArray();
}
return data;
}
The Problem/Error:
But when the encoder tries to save the memory stream, it says a frame has been disposed... see error message below:
Void SaveFrame(System.Windows.Media.SafeMILHandle, System.Windows.Media.SafeMILHandle, System.Windows.Media.Imaging.BitmapFrame)
Cannot access a disposed object.
System.ObjectDisposedException: Cannot access a disposed object.
at System.Windows.Media.Imaging.BitmapEncoder.SaveFrame(SafeMILHandle frameEncodeHandle, SafeMILHandle encoderOptions, BitmapFrame frame)
at System.Windows.Media.Imaging.BitmapEncoder.Save(Stream stream)
Any help? How can I display the ImageBrush without creating UI elements!
The error was not to set BitmapCacheOption.OnLoad, which is necessary when the source stream is to be closed right after EndInit:
bImg.BeginInit();
bImg.CacheOption = BitmapCacheOption.OnLoad;
bImg.StreamSource = memoryStream;
bImg.EndInit();
memoryStream.Close();
However, creating the intermediate BitmapImage wasn't necessary at all. The code should simply look like this:
private byte[] BitmapSourceToByteArray(BitmapSource bmpSrc)
{
var encoder = new JpegBitmapEncoder();
encoder.QualityLevel = 100;
encoder.Frames.Add(BitmapFrame.Create(bmpSrc));
using (var stream = new MemoryStream())
{
encoder.Save(stream);
return stream.ToArray();
}
}
So to make it simple, I have a Windows.UI.Xaml.Controls.Image in my C# class that is named MyImage. I would like to convert it to byte[] so that I can store it to my database.I have no idea how to do this since the image is Windows.UI.Xaml.Controls.Image and not System.Drawing.Image so I can't do something like this:
...
MemoryStream ms = new MemoryStream();
imageIn.Save(ms,System.Drawing.Imaging.ImageFormat.Gif);
return ms.ToArray();
I would appreciate if someone could write down a simple "how to" code to do this because I just can't figure it out.
I believe that you are using a bitmap image then
myImage = new BitmapImage(new Uri("YourImagePath", UriKind.Absolute));
MemoryStream ms = new MemoryStream();
WriteableBitmap wb = new WriteableBitmap(myImage);
wb.SaveJpeg(ms, myImage.PixelWidth, myImage.PixelHeight, 0, 100);
byte[] imageBytes = ms.ToArray();
This works for Windows Phone But if you are writing code for Windows Store App would suggest you to modify it.
myImage = new BitmapImage(new Uri("YourImagePath"));
RandomAccessStreamReference rasr = RandomAccessStreamReference.CreateFromUri(bitmapImage.UriSource);
var streamWithContent = await rasr.OpenReadAsync();
byte[] buffer = new byte[streamWithContent.Size];
await streamWithContent.ReadAsync(buffer.AsBuffer(), (uint)streamWithContent.Size, InputStreamOptions.None);
I am having a problem converting a Byte array into an Image type for displaying in an application on Windows Phone 7.
The data is retrieved from a server, and when I upload and download the data it works fine, but I am struggling when converting it back into an Image format.
Can anyone shed some light on this issue for me?
This is my method for turning the Byte array into a BitmapImage,
public BitmapImage decodeImage(byte[] array)
{
MemoryStream ms = new MemoryStream(array, 0, array.Length);
// Convert byte[] to Image
ms.Write(array, 0, array.Length);
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.SetSource(ms);
return bitmapImage;
}
Then this is the code where I try to set the returned BitmapImage to the source for the Image box I am using in the XAML UI.
BitmapImage usrIMG = new BitmapImage();
usrIMG = getJson.decodeImage(userProfile.Photos[0].Image);
profileImage.Source = usrIMG;
I know the code looks mishmashed, and I am declaring things that I dont need to, i have been fiddling with it for ages and I am completely at a loss.
Many Thanks
the following code works fine for me in a quick test for your scenario of using the PhotoChooserTask, and store the selected image in a byte array. You also might want to review your code where you store and retrieve the byte array on your side, to make sure nothing gets lost there.
private byte[] imageBytes;
private void GetPhoto_Click(object sender, RoutedEventArgs e)
{
PhotoChooserTask photoTask = new PhotoChooserTask();
photoTask.Completed += new EventHandler<PhotoResult>(photoTask_Completed);
photoTask.Show();
}
void photoTask_Completed(object sender, PhotoResult e)
{
imageBytes = new byte[e.ChosenPhoto.Length];
e.ChosenPhoto.Read(imageBytes, 0, imageBytes.Length);
// save 'imageBytes' byte array to data base ...
}
private void ShowPhoto_Click(object sender, RoutedEventArgs e)
{
// load 'imageBytes' byte array to data base ...
BitmapImage bitmapImage = new BitmapImage();
MemoryStream ms = new MemoryStream(imageBytes);
bitmapImage.SetSource(ms);
myImageElement.Source = bitmapImage;
}
You'll need a WritableBitmap and to know the height and width of the image to be able to do this.
Then you can do something like this:
var result = new WriteableBitmap(width, height);
var ms = new MemoryStream();
ms.Write(myByteArray, myByteArray, myByteArray.Length);
result.SetSource(ms);
var bitmapImage = new BitmapImage();
bitmapImage.SetSource(new MemoryStream(..Binary array Data..));
img1.Source = bitmapImage;
public BitmapImage ByteArraytoBitmap(Byte[] byteArray)
{
MemoryStream stream = new MemoryStream(byteArray);
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.SetSource(stream);
return bitmapImage;
}
i used this code before and it's work 100% successfuly.
I am using visual studio 2010, (desktop application) and using LINQ to SQL to save image/video or audio files to database in dataType VarBinary (MAX). This I can do... Problem is, I can't get them and display them in xaml because I can't get the converting part correct. Here is what I have so far (though its not working);
private void bt_Click (object sender, RoutedEventArgs e)
{
databaseDataContext context = new databaseDataContext();
var imageValue = from s in context.Images
where s.imageID == 2
select s.imageFile;
value = imageValue.Single().ToString();
//convert to string and taking down to next method to get converted in image
}
public string value { get; set; }
public object ImageSource //taking from http://stackoverflow.com/
{
get
{
BitmapImage image = new BitmapImage();
try
{
image.BeginInit();
image.CacheOption = BitmapCacheOption.OnLoad;
image.CreateOptions = BitmapCreateOptions.IgnoreImageCache;
image.UriSource = new Uri(value, UriKind.Absolute);
image.EndInit();
Grid.Children.Add(image);
}
catch { return DependencyProperty.UnsetValue; } return image;
}
}
I not even sure if I am on the correct track? And I am assuming that video or audio is quite similar methods?
Since your image is stored in binary format in the database, you want to "stream" this into an image object by leveraging the MemoryStream object.
Looking at your code, your solution will look something like this:
BitmapImage bmpImage = new BitmapImage();
MemoryStream msImageStream = new MemoryStream();
msImageStream.Write(value, 0, value.Length);
bmpCardImage.BeginInit();
bmpCardImage.StreamSource = new MemoryStream(msImageStream.ToArray());
bmpCardImage.EndInit();
image.Source = bmpCardImage;
It's very easy, if you have a binary data and want to create an Image object, use this code:
public Image BinaryToImage(byte[] binaryData)
{
MemoryStream ms = new MemoryStream(binaryData);
Image img = Image.FromStream(ms);
return img;
}
If you already have the bytes, to verify that what you saved is correct you can save the bytes to a file and open it....
string tempFile = Path.GetTempFileName();
MemoryStream ms = new MemoryStream(bytes); //bytes that was read from the db
//Here I assume that you're reading a png image, you can put any extension you like is a file name
FileStream stream = new FileStream(tempFile + ".png", FileMode.Create);
ms.WriteTo(stream);
ms.Close();
stream.Close();
//And here we open the file with the default program
Process.Start(tempFile + ".png");
And later you can use the answer of Dillie-O and stream....
Dillie-O's code makes for a very nice extension method:
// from http://stackoverflow.com/questions/5623264/how-to-convert-varbinary-into-image-or-video-when-retrieved-from-database-in-c:
public static BitmapImage ToImage(this Binary b)
{
if (b == null)
return null;
var binary = b.ToArray();
var image = new BitmapImage();
var ms = new MemoryStream();
ms.Write(binary, 0, binary.Length);
image.BeginInit();
image.StreamSource = new MemoryStream(ms.ToArray());
image.EndInit();
return image;
}