C#•2y ago

Bitmap From BitmapSource new Error [Answered]

I've been working on a project of mine for quite some time, and I haven't encountered this error before. Data fed into the method converting an image source to a bitmap has not changed, nor the method itself. I cannot explain why I am getting this error, and google yielded no results.

50 Replies

LukeZurg22•2y ago

System.PlatformNotSupportedException: 'System.Drawing.Common is not supported on this platform.'

System.PlatformNotSupportedException: 'System.Drawing.Common is not supported on this platform.'

Full method:

        private Bitmap BitmapFromSource(BitmapSource bitmapsource)
        {
            Bitmap bitmap;
            using (MemoryStream outStream = new MemoryStream())
            {
                BitmapEncoder enc = new BmpBitmapEncoder();

                enc.Frames.Add(BitmapFrame.Create(bitmapsource));
                enc.Save(outStream);
                bitmap = new Bitmap(outStream);
            }
            return bitmap;
        }

        private Bitmap BitmapFromSource(BitmapSource bitmapsource)
        {
            Bitmap bitmap;
            using (MemoryStream outStream = new MemoryStream())
            {
                BitmapEncoder enc = new BmpBitmapEncoder();

                enc.Frames.Add(BitmapFrame.Create(bitmapsource));
                enc.Save(outStream);
                bitmap = new Bitmap(outStream);
            }
            return bitmap;
        }

Context:

            var source = (BitmapSource)mapMode.Source;
            var image = (Image)sender;
            var mousePos = e.GetPosition(image);
            var pixelX = (int)((mousePos.X / image.ActualWidth * source.PixelWidth) - 0.1);
            var pixelY = (int)((mousePos.Y / image.ActualHeight * source.PixelHeight) - 0.1);
            var bitmap = BitmapFromSource(source);
            var pixelColor = bitmap.GetPixel(pixelX, pixelY);

            var source = (BitmapSource)mapMode.Source;
            var image = (Image)sender;
            var mousePos = e.GetPosition(image);
            var pixelX = (int)((mousePos.X / image.ActualWidth * source.PixelWidth) - 0.1);
            var pixelY = (int)((mousePos.Y / image.ActualHeight * source.PixelHeight) - 0.1);
            var bitmap = BitmapFromSource(source);
            var pixelColor = bitmap.GetPixel(pixelX, pixelY);

mapMode is from the Image control in WPF. : System.Windows.Controls.Image The concept is that I am converting the data of an image source into a bitmap for manipulation.

Unknown User•2y ago

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LukeZurg22•2y ago

I’m using .NET 5 I upgraded from an older .NET Framework, but not to .NET 6 as far as I’m aware. My goal was to simply get the pixel data of an image that has been clicked on. The image changes and moves, so how I handled it was to convert the image source into a bitmap, which any given pixel was read directly.

Unknown User•2y ago

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LukeZurg22•2y ago

Wacky, since it worked fine for the while until now. Regardless yeah it’s in windows; would you know any alternative to getting a pixel from a click upon an image control.

Unknown User•2y ago

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LukeZurg22•2y ago

Hmmm.. when I hop on my pc I’ll take a look. It just might have what I’m going for. Why had Windows discontinued System.Drawing anyway? It was the crutch of a lot of my image manipulation in my first project, and seemed rather important.

Unknown User•2y ago

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LukeZurg22•2y ago

Klarth•2y ago

It's not "discontinued". But System.Drawing.Common isn't available in .NET 6 (net6.0) because it was never cross-platform compatible. However, you can add it via NuGet and use it if you use net6.0-windows.

LukeZurg22•2y ago

Weird, because i'm not using .NET 6 in my project! I'm using .NET 5, and have been for a while.

Klarth•2y ago

Yeah, kinda weird in the context of .NET 5 WPF. https://learn.microsoft.com/en-us/dotnet/core/compatibility/core-libraries/6.0/system-drawing-common-windows-only is the article for the change. What's the exact line that throws PlatformNotSupportException? Or does it happen at startup?

LukeZurg22•2y ago

Exactly? I'll get it for you, 1 sec bitmap = new Bitmap(outStream); : Line 236 on NavigationHandler.cs Error: System.PlatformNotSupportedException: 'System.Drawing.Common is not supported on this platform.' Details:

LukeZurg22•2y ago

message.txt

Klarth•2y ago

Maybe your System.Drawing.Common is past .NET5 and does an TFM check somehow? I'm not really sure.

LukeZurg22•2y ago

? Maybe?

Klarth•2y ago

Try changing the project target to net5.0-windows and see what happens.

LukeZurg22•2y ago

Cannot sadly

LukeZurg22•2y ago

Klarth•2y ago

Though that should only affect build errors and not runtime stuff.

LukeZurg22•2y ago

These are my options and it's already on .NET 5

Klarth•2y ago

You need to open the csproj Just double click the project and edit the XML.

LukeZurg22•2y ago

<TargetFramework>net5.0-windows7.0</TargetFramework>

Klarth•2y ago

I think that's a valid one. 🤔

Unknown User•2y ago

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LukeZurg22•2y ago

No, windows 10.

Klarth•2y ago

That's a min version.

LukeZurg22•2y ago

Switching the OS version makes no difference, i've tested that.

Unknown User•2y ago

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LukeZurg22•2y ago

If only!

Unknown User•2y ago

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LukeZurg22•2y ago

Not yet, I'm going to look over it tonight. Steeped neck-deep in work at the moment.

Unknown User•2y ago

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LukeZurg22•2y ago

Well, I say that, but I did do a quick test of the sample, and it looks fantastic Since it clearly works with an uploaded image file**, I'd wager it's got exactly what I need.

Klarth•2y ago

Personally, I've moved away from Bitmap into other image types like WriteableBitmap (most GUI frameworks have their own version, WPF included), ImageSharp's Image, or SkiaSharp's SKImage / SKBitmap.

LukeZurg22•2y ago

I am using WriteableBitmap elsewhere, surely. In fact the image itself is stored as a WriteableBitmap which is sourced from the Image.Source -> BitmapSource

Unknown User•2y ago

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LukeZurg22•2y ago

In my code I had written it apparently in a way where clicking the image is meant to yield the pixel data you clicked on, but only in the bounds of that control; lest you get funky window pixel data.

Klarth•2y ago

I'd just map the coordinate to fetch from the WriteableBitmap then.

LukeZurg22•2y ago

Awesome! How? HmmNoted

Klarth•2y ago

Because it's a lot of work to create a managed version of those and the ImageSharp guy is a bit of an ass, even if he created a great library https://github.com/dotnet/Microsoft.Maui.Graphics/issues/47

LukeZurg22•2y ago

That was painful to read. Now I know why a friend of mine calls M$ "Microshit"

Klarth•2y ago

You can either lock the WriteableBitmap and access the BackBuffer by pointer or use CopyPixels and work from that buffer. You can look at https://github.com/stevemonaco/ImageMagitek/blob/main/TileShop.WPF/ViewExtenders/Imaging/DirectBitmapAdapter.cs#L85 for an example of the first, although it's writing from one image format into the WriteableBitmap instead of reading. Reverse would be similar.

Unknown User•2y ago

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LukeZurg22•2y ago

Yeah, we are are getting into territory that is starting to become entirely foreign to me. At the moment I have BitmapSource, and Image.Source as things to work with. Image.Source is the one most reliable.

Klarth•2y ago

Oh and the Bitmap property here is a WriteableBitmap. Well, you said the Source is/was a WriteableBitmap.

LukeZurg22•2y ago

Yes and no, and I should correct myself here. I think I actually know a good and neat way to grab it and it was under my nose in my old code.

Klarth•2y ago

If that's true everywhere where needed, then you can just cast.

LukeZurg22•2y ago

var provinceMapSource = BitmapFactory.ConvertToPbgra32Format((BitmapSource)MainWindow.mapProvinces.Source);

var provinceMapSource = BitmapFactory.ConvertToPbgra32Format((BitmapSource)MainWindow.mapProvinces.Source);

This converts the image source to a WriteableBitmap with no issue. I only recently made it this way as the code i'm working with is old, and very poorly written, so reworking it to new methods is a bit harder when you have a supposedly functional one right in front of you.

_ = SpareMaps.TryGetValue(MainWindow.mapModeButtons.GetMapMode(), out Image mapMode);
            var mapSource = BitmapFactory.ConvertToPbgra32Format((BitmapSource)mapMode.Source);
            var image = (Image)sender;
            var mousePos = e.GetPosition(image);
            var pixelX = (int)(mousePos.X / image.ActualWidth * mapSource.PixelWidth - 0.1);
            var pixelY = (int)(mousePos.Y / image.ActualHeight * mapSource.PixelHeight - 0.1);
            var pixelColor = mapSource.GetPixel(pixelX, pixelY);

_ = SpareMaps.TryGetValue(MainWindow.mapModeButtons.GetMapMode(), out Image mapMode);
            var mapSource = BitmapFactory.ConvertToPbgra32Format((BitmapSource)mapMode.Source);
            var image = (Image)sender;
            var mousePos = e.GetPosition(image);
            var pixelX = (int)(mousePos.X / image.ActualWidth * mapSource.PixelWidth - 0.1);
            var pixelY = (int)(mousePos.Y / image.ActualHeight * mapSource.PixelHeight - 0.1);
            var pixelColor = mapSource.GetPixel(pixelX, pixelY);

For the sake of sharing, I think this might actually work It has a bit of my old code in there, but shouldn't have any issues. Oh yeah, hella inaccurate. Closing this thread. The original problem has already been solved through the usage of that suggested link.

Accord•2y ago

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Bitmap From BitmapSource new Error [Answered]