WinUI alternative for Wpf's CreateBitmapSourceFromHIcon.

[gautambjain]

Wpf had Imaging.CreateBitmapSourceFromHIcon . How do I do it in WinUI?

Basically, I want to show a file's icon in a listview. I plan to use SHGetFileInfo to get HICON. But don't know how to show it in list view.

Please help :o)

[castorix]

Basically, I want to show a file's icon in a listview.I plan to use SHGetFileInfo to get HICON.

I think it is simpler to use GetThumbnailAsync, then you can set it as BitmapSource for a control
(like in the test I did in this thread : Set System.Drawing.Icon as Source for ImageIcon control - WinUI 3)

[gautambjain]

Thanks again @castorix for rapid answers. God bless you.

[gautambjain]

This is working. The above method does 2 things -

1. For regular non-image files, it loads the file's icon (of associated app) like shown in Windows File Explorer
2. For image files (jpg, png etc), it loads the thumbnail (small version of the image itself). Which affects the performance of my app.

I don't want the thumbnails to be loaded. I just want the file's icon so that the files list in my app loads faster.

Is there a way for this?

[castorix]

I don't want the thumbnails to be loaded. I just want the file's icon so that the files list in my app loads faster.
Is there a way for this?

Once you got the icon handle, you can convert it to WriteableBitmap
Instead of SHGetFileInfo, MS recommends IExtractIcon , but it needs more code
To get a WriteableBitmap, it can be done with GDI, like I did in the GetCaptureWriteableBitmap function (https://github.com/castorix/WinUI3_MediaEngine/blob/master/CMediaEngine.cs)
You can use GetIconInfo to convert first hIcon to hBitmap (I tested with Notepad icon and returned hbmColor, then the returned WriteableBitmap set to .Source of an Image control)

    [DllImport("User32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
    public static extern bool GetIconInfo(IntPtr hIcon, out ICONINFO piconinfo);

    [StructLayout(LayoutKind.Sequential)]
    public struct ICONINFO
    {
        public bool fIcon;
        public uint xHotspot;
        public uint yHotspot;
        public IntPtr hbmMask;
        public IntPtr hbmColor;
    }

[gautambjain]

Fantastic! This worked.