I've adopted the C# solution from this answer for both Windows PowerShell 5.1 and PowerShell Core 7+.
I've included all dependencies of the original code (which were distributed over multiple answers), so the code runs as-is.
$refAsm = @(
'System.Windows.Forms'
if( $PSVersionTable.PSVersion.Major -le 5 ) {'System.Drawing'} else { 'System.Drawing.Common', 'System.Drawing.Primitives' }
)
Add-Type -ReferencedAssemblies $refAsm -TypeDefinition @'
using System;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Runtime.InteropServices;
public static class ClipboardImage {
/// <summary>
/// Retrieves an image from the given clipboard data object, in the order PNG, DIB, Bitmap, Image object.
/// </summary>
/// <param name="retrievedData">The clipboard data.</param>
/// <returns>The extracted image, or null if no supported image type was found.</returns>
public static Bitmap GetClipboardImage(DataObject retrievedData)
{
Bitmap clipboardimage = null;
// Order: try PNG, move on to try 32-bit ARGB DIB, then try the normal Bitmap and Image types.
if (retrievedData.GetDataPresent("PNG", false))
{
MemoryStream png_stream = retrievedData.GetData("PNG", false) as MemoryStream;
if (png_stream != null)
using (Bitmap bm = new Bitmap(png_stream))
clipboardimage = (Bitmap) bm.Clone();
}
if (clipboardimage == null && retrievedData.GetDataPresent(DataFormats.Dib, false))
{
MemoryStream dib = retrievedData.GetData(DataFormats.Dib, false) as MemoryStream;
if (dib != null)
clipboardimage = ImageFromClipboardDib(dib.ToArray());
}
if (clipboardimage == null && retrievedData.GetDataPresent(DataFormats.Bitmap))
clipboardimage = new Bitmap(retrievedData.GetData(DataFormats.Bitmap) as Image);
if (clipboardimage == null && retrievedData.GetDataPresent(typeof(Image)))
clipboardimage = new Bitmap(retrievedData.GetData(typeof(Image)) as Image);
return clipboardimage;
}
public static Bitmap ImageFromClipboardDib(Byte[] dibBytes)
{
if (dibBytes == null || dibBytes.Length < 4)
return null;
try
{
Int32 headerSize = (Int32)ReadIntFromByteArray(dibBytes, 0, 4, true);
// Only supporting 40-byte DIB from clipboard
if (headerSize != 40)
return null;
Byte[] header = new Byte[40];
Array.Copy(dibBytes, header, 40);
Int32 imageIndex = headerSize;
Int32 width = (Int32)ReadIntFromByteArray(header, 0x04, 4, true);
Int32 height = (Int32)ReadIntFromByteArray(header, 0x08, 4, true);
Int16 planes = (Int16)ReadIntFromByteArray(header, 0x0C, 2, true);
Int16 bitCount = (Int16)ReadIntFromByteArray(header, 0x0E, 2, true);
//Compression: 0 = RGB; 3 = BITFIELDS.
Int32 compression = (Int32)ReadIntFromByteArray(header, 0x10, 4, true);
// Not dealing with non-standard formats.
if (planes != 1 || (compression != 0 && compression != 3))
return null;
PixelFormat fmt;
switch (bitCount)
{
case 32:
fmt = PixelFormat.Format32bppRgb;
break;
case 24:
fmt = PixelFormat.Format24bppRgb;
break;
case 16:
fmt = PixelFormat.Format16bppRgb555;
break;
default:
return null;
}
if (compression == 3)
imageIndex += 12;
if (dibBytes.Length < imageIndex)
return null;
Byte[] image = new Byte[dibBytes.Length - imageIndex];
Array.Copy(dibBytes, imageIndex, image, 0, image.Length);
// Classic stride: fit within blocks of 4 bytes.
Int32 stride = (((((bitCount * width) + 7) / 8) + 3) / 4) * 4;
if (compression == 3)
{
UInt32 redMask = ReadIntFromByteArray(dibBytes, headerSize + 0, 4, true);
UInt32 greenMask = ReadIntFromByteArray(dibBytes, headerSize + 4, 4, true);
UInt32 blueMask = ReadIntFromByteArray(dibBytes, headerSize + 8, 4, true);
// Fix for the undocumented use of 32bppARGB disguised as BITFIELDS. Despite lacking an alpha bit field,
// the alpha bytes are still filled in, without any header indication of alpha usage.
// Pure 32-bit RGB: check if a switch to ARGB can be made by checking for non-zero alpha.
// Admitted, this may give a mess if the alpha bits simply aren't cleared, but why the hell wouldn't it use 24bpp then?
if (bitCount == 32 && redMask == 0xFF0000 && greenMask == 0x00FF00 && blueMask == 0x0000FF)
{
// Stride is always a multiple of 4; no need to take it into account for 32bpp.
for (Int32 pix = 3; pix < image.Length; pix += 4)
{
// 0 can mean transparent, but can also mean the alpha isn't filled in, so only check for non-zero alpha,
// which would indicate there is actual data in the alpha bytes.
if (image[pix] == 0)
continue;
fmt = PixelFormat.Format32bppPArgb;
break;
}
}
else
// Could be supported with a system that parses the colour masks,
// but I don't think the clipboard ever uses these anyway.
return null;
}
Bitmap bitmap = BuildImage(image, width, height, stride, fmt, null, null);
// This is bmp; reverse image lines.
bitmap.RotateFlip(RotateFlipType.Rotate180FlipX);
return bitmap;
}
catch
{
return null;
}
}
/// <summary>
/// Creates a bitmap based on data, width, height, stride and pixel format.
/// </summary>
/// <param name="sourceData">Byte array of raw source data</param>
/// <param name="width">Width of the image</param>
/// <param name="height">Height of the image</param>
/// <param name="stride">Scanline length inside the data</param>
/// <param name="pixelFormat">Pixel format</param>
/// <param name="palette">Color palette</param>
/// <param name="defaultColor">Default color to fill in on the palette if the given colors don't fully fill it.</param>
/// <returns>The new image</returns>
public static Bitmap BuildImage(Byte[] sourceData, Int32 width, Int32 height, Int32 stride, PixelFormat pixelFormat, Color[] palette, Color? defaultColor)
{
Bitmap newImage = new Bitmap(width, height, pixelFormat);
BitmapData targetData = newImage.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, newImage.PixelFormat);
Int32 newDataWidth = ((Image.GetPixelFormatSize(pixelFormat) * width) + 7) / 8;
// Compensate for possible negative stride on BMP format.
Boolean isFlipped = stride < 0;
stride = Math.Abs(stride);
// Cache these to avoid unnecessary getter calls.
Int32 targetStride = targetData.Stride;
Int64 scan0 = targetData.Scan0.ToInt64();
for (Int32 y = 0; y < height; y++)
Marshal.Copy(sourceData, y * stride, new IntPtr(scan0 + y * targetStride), newDataWidth);
newImage.UnlockBits(targetData);
// Fix negative stride on BMP format.
if (isFlipped)
newImage.RotateFlip(RotateFlipType.Rotate180FlipX);
// For indexed images, set the palette.
if ((pixelFormat & PixelFormat.Indexed) != 0 && palette != null)
{
ColorPalette pal = newImage.Palette;
for (Int32 i = 0; i < pal.Entries.Length; i++)
{
if (i < palette.Length)
pal.Entries[i] = palette[i];
else if (defaultColor.HasValue)
pal.Entries[i] = defaultColor.Value;
else
break;
}
newImage.Palette = pal;
}
return newImage;
}
static void WriteIntToByteArray(Byte[] data, Int32 startIndex, Int32 bytes, Boolean littleEndian, UInt32 value)
{
Int32 lastByte = bytes - 1;
if (data.Length < startIndex + bytes)
throw new ArgumentOutOfRangeException("startIndex", "Data array is too small to write a " + bytes + "-byte value at offset " + startIndex + ".");
for (Int32 index = 0; index < bytes; index++)
{
Int32 offs = startIndex + (littleEndian ? index : lastByte - index);
data[offs] = (Byte)(value >> (8 * index) & 0xFF);
}
}
static UInt32 ReadIntFromByteArray(Byte[] data, Int32 startIndex, Int32 bytes, Boolean littleEndian)
{
Int32 lastByte = bytes - 1;
if (data.Length < startIndex + bytes)
throw new ArgumentOutOfRangeException("startIndex", "Data array is too small to read a " + bytes + "-byte value at offset " + startIndex + ".");
UInt32 value = 0;
for (Int32 index = 0; index < bytes; index++)
{
Int32 offs = startIndex + (littleEndian ? index : lastByte - index);
value += (UInt32)(data[offs] << (8 * index));
}
return value;
}
}
'@
Usage example:
Add-Type -Assembly System.Windows.Forms
$data = [System.Windows.Forms.Clipboard]::GetDataObject()
$image = [ClipboardImage]::GetClipboardImage( $data )
$image.Save("$PWD\clipboard.png")
