public static Bitmap CopyHBitmapToBitmap(IntPtr nativeHBitmap)
{
// Get width, height and the address of the pixel data for the native HBitmap
BITMAP bitmapStruct = new BITMAP();
ShellNativeMethods.GetObjectBitmap(nativeHBitmap, Marshal.SizeOf(bitmapStruct), ref bitmapStruct);
// Create a managed bitmap that has its pixel data pointing to the pixel data of the native HBitmap
// No memory is allocated for its pixel data
Bitmap managedBitmapPointer = new Bitmap(
bitmapStruct.bmWidth, bitmapStruct.bmHeight, bitmapStruct.bmWidth * 4, PixelFormat.Format32bppArgb, bitmapStruct.bmBits);
// Create a managed bitmap and allocate memory for pixel data
Bitmap managedBitmapReal = new Bitmap(bitmapStruct.bmWidth, bitmapStruct.bmHeight, PixelFormat.Format32bppArgb);
// Copy the pixels of the native HBitmap into the canvas of the managed bitmap
Graphics graphics = Graphics.FromImage(managedBitmapReal);
graphics.DrawImage(managedBitmapPointer, 0, 0);
graphics.Dispose();
// Delete the native HBitmap object and free memory
ShellNativeMethods.DeleteObject(nativeHBitmap);
// Return the managed bitmap, clone of the native HBitmap, with correct transparency
return(managedBitmapReal);
}
public static extern int GetObjectBitmap(IntPtr hObject, int nCount, ref BITMAP lpObject);