Develop Reference

DataPackageView Bitmap looses transparency

Using the .NET framework, when retrieving the image from the clipboard by converting the IRandomAccessStreamReference, the transparency on .PNG images is lost. How can i prevent this?
var content = Windows.ApplicationModel.DataTransfer.Clipboard.GetContent();
if (content.Contains(StandardDataFormats.Bitmap))
{
IRandomAccessStreamReference imageReceived = await content.GetBitmapAsync();
BitmapImage bitmap = null;
using (IRandomAccessStreamWithContentType imageStream = await imageReceived.OpenReadAsync())
{
bitmap = new BitmapImage();
bitmap.BeginInit();
bitmap.StreamSource = imageStream.AsStream();
bitmap.CacheOption = BitmapCacheOption.OnLoad;
bitmap.EndInit();
bitmap.Freeze();
}
}

C#: Getting black image after initiliazing Image with Bitmapimage in WPF

Hi Developer,
I have an issue to display a bitmap image in my System.Windows.Controls.Image,
Am I using Pixelformat correctly?
I am able to display the image, but it shows me just a black rectangle.
I am trying to get the image from the Scanner.
Thank you very much in advance.
Bitmap b = new Bitmap(displayW, displayH, image.PixelFormat);
VCardScan.MainWindow.AppWindow.setImageSource(BitmapToImageSource(b));
public void setImageSource(BitmapImage bitmap)
{
CardBox.Source = bitmap;
}
BitmapImage BitmapToImageSource(Bitmap bitmap)
{
using (MemoryStream memory = new MemoryStream())
{
System.Console.WriteLine(bitmap.ToString());
bitmap.Save(memory, ImageFormat.Png);
memory.Position = 0;
BitmapImage bitmapimage = new BitmapImage();
bitmapimage.BeginInit();
bitmapimage.StreamSource = memory;
bitmapimage.CacheOption = BitmapCacheOption.OnLoad;
bitmapimage.EndInit();
return bitmapimage;
}
}

Unable to display Image created from Base64 BitmapImage

I want to display an Image in a StackPanel from a base64 string but it's not working correctly.
string base64encodedImage = el.Value;
byte[] imageData = Convert.FromBase64String(base64encodedImage);
Image imageSection = new Image();
BitmapImage image = new BitmapImage();
using (MemoryStream memStream = new MemoryStream(imageData))
{
image.BeginInit();
image.StreamSource = memStream;
image.EndInit();
}
imageSection.Source = image;
panel.Children.Add(imageSection);
Example Base64 Image:
iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==
The BitmapImage gets a width and height, the Image however does not and nothing is displayed, what am I doing wrong?

Refer to this post to find the correct way to get the BitmapImage from byte array.

Fill WPF rectangle with Image

I created new WPF control, added a Rectangle to it, and everyhing works alright, its drawn like it should be. But I just cant paint the rectangle with an actual Image.
BitmapImage bi = GetImage();
ImageBrush imgBrush= new ImageBrush(bi);
this.rectangle.Fill = imgBrush;
But this code just makes the rectangle transparent, except the stroke.
This is the GetImage() method:
BitmapImage bi;
using (MemoryStream ms = new MemoryStream())
{
bi = new BitmapImage();
bi.CacheOption = BitmapCacheOption.OnLoad;
texture.SaveAsPng(ms, texture.Width, texture.Height);
ms.Seek(0, SeekOrigin.Begin);
bi.BeginInit();
bi.StreamSource = ms;
bi.EndInit();
ms.Close();
}
return bi;
texture is an Texture2D class, that is made before this code.
If I return Bitmap insted of BitmapImage here and then save that Bitmap the picture is drawn correctly.
Thank you for your help

This is the correct way to convert Bitmap to BitmapImage:
using(MemoryStream memory = new MemoryStream())
{
bitmap.Save(memory, ImageFormat.Png);
memory.Position = 0;
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.BeginInit();
bitmapImage.StreamSource = memory;
bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
bitmapImage.EndInit();
}
Thanks to "Pawel Lesnikowski", he posted the anwser in the following topic:
Load a WPF BitmapImage from a System.Drawing.Bitmap

Accessing embedded image and creating a System.Windows.Controls.Image

I had set up to access an embedded resource and return an System.Drawing.Image but i cant use this to set the background of a canvas.
Could someone please show me how to access an embedded image file and create a System.Windows.Controls.Image. Code I have so far is :
public static Image Load(Type classType, string resourcePath)
{
Assembly asm = Assembly.GetAssembly(classType);
Stream imgStream = asm.GetManifestResourceStream(resourcePath);
Image img = Image.FromStream(imgStream);
imgStream.Close();
return img;
}
Please let me know if you require anymore information

If you don't specifically need to use a `System.Drawing.Image', then you could try something like:
Assembly asm = Assembly.GetCallingAssembly();
var res = asm.GetManifestResourceNames();
Stream imgStream = asm.GetManifestResourceStream("path.to.resource");
BitmapImage image = new BitmapImage();
image.BeginInit();
image.StreamSource = imgStream;
image.EndInit();
ImageBrush brush = new ImageBrush();
brush.ImageSource = image;
imageCanvas.Background = brush;

Bitmap bm = new Bitmap(#"....");
img = bm;