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I have a WPF project that uses.NET 6.0. Now I want to get a preview of the camera, using the MediaCapture class, but there is no CaptureElement in WPF, so I can't show the preview. So I want to get the frame and draw it on the image myself, is there any way to do that
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Hi, 华 张. Welcome to Microsoft Q&A Forum.
You could use MediaCapture API in a WPF application. To do so you need to setup your project to target the right windows versions:
<PropertyGroup>
<OutputType>WinExe</OutputType>
<TargetFramework>net6.0-windows10.0.17763.0</TargetFramework>
<Nullable>enable</Nullable>
<UseWPF>true</UseWPF>
<ImplicitUsings>enable</ImplicitUsings>
</PropertyGroup>
To learn more, you can take a look at Call Windows Runtime APIs in desktop apps.
For a WPF project sample, you could try checking out MediaCaptureApiWPF .
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Hi, 华 张. Is there any update to the question? Did my answer solve your problem? If so, you could accept it as the answer. It's helpful for community members with related questions.
Referring to this code, this is to capture the photo. My code is as follows. I cannot convert softwareBitmap to imagesource at this time
private async void ColorFrameReader_FrameArrived(MediaFrameReader sender, MediaFrameArrivedEventArgs args)
{
var mediaFrameReference = sender.TryAcquireLatestFrame();
var videoMediaFrame = mediaFrameReference?.VideoMediaFrame;
var softwareBitmap = videoMediaFrame?.SoftwareBitmap;
if (softwareBitmap != null)
{
if (softwareBitmap.BitmapPixelFormat != Windows.Graphics.Imaging.BitmapPixelFormat.Bgra8 ||
softwareBitmap.BitmapAlphaMode != Windows.Graphics.Imaging.BitmapAlphaMode.Premultiplied)
{
softwareBitmap = SoftwareBitmap.Convert(softwareBitmap, BitmapPixelFormat.Bgra8, BitmapAlphaMode.Premultiplied);
}
// Swap the processed frame to _backBuffer and dispose of the unused image.
softwareBitmap = Interlocked.Exchange(ref backBuffer, softwareBitmap);
softwareBitmap?.Dispose();
using (var stream = new InMemoryRandomAccessStream())
{
var encoder = await BitmapEncoder.CreateAsync(
BitmapEncoder.PngEncoderId, stream);
encoder.SetSoftwareBitmap(softwareBitmap);
await encoder.FlushAsync();
}
Hi, 华 张. There is no direct conversion. You'll need to extract the image data from the SoftwareBitmap and then create the new Bitmap from that data.
This is essentially what the linked question does: it encodes the data from the WriteableBitmap into a .BMP stream and then loads the System.Drawing.Bitmap from that stream.
You could do the same from the SoftwareBitmap by using Windows.Graphics.Imaging.BitmapEncoder.SetSoftwareBitmap to convert its contents to an image stream and then create a new System.Drawing.Bitmap from that stream.
See Save a SoftwareBitmap to a file with BitmapEncoder for sample code. You can render to an InMemoryRandomAccessStream instead of a StorageFile's stream to avoid saving to disk, and can use AsStream to convert it to a .Net System.IO.Stream to read into the System.Drawing.Bitmap something like the following (untested) snippet:
using (var stream = new Windows.Storage.Streams.InMemoryRandomAccessStream())
{
BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, stream);
encoder.SetSoftwareBitmap(softwareBitmap);
await encoder.FlushAsync();
bmp = new System.Drawing.Bitmap(stream.AsStream());
}
To convert Bitmap to ImageSource you could try the following code.
[DllImport("gdi32.dll", EntryPoint = "DeleteObject")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool DeleteObject([In] IntPtr hObject);
public ImageSource ImageSourceFromBitmap(Bitmap bmp)
{
var handle = bmp.GetHbitmap();
try
{
return Imaging.CreateBitmapSourceFromHBitmap(handle, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
}
finally { DeleteObject(handle); }
}