public static unsafe void ProcessDropFiles(ref WindowMessage msg, MainWindow window)
{
fixed(WindowMessage *ptr = &msg)
{
var packet = new DropFilesPacket(ptr);
window.OnDropFiles(ref packet);
}
}
public void OnDropFiles(ref DropFilesPacket packet)
{
IntPtr hDrop = packet.HDrop;
try
{
uint count = Shell32.DragQueryFileW(hDrop, 0xFFFFFFFF, IntPtr.Zero, 0);
var paths = new string[(int)count];
for (uint i = 0; i < count; i++)
{
uint size = Shell32.DragQueryFileW(hDrop, i, IntPtr.Zero, 0);
char[] chars = ArrayPool <char> .Shared.Rent((int)(size + 1));
try
{
GCHandle handle = GCHandle.Alloc(chars, GCHandleType.Pinned);
try
{
Shell32.DragQueryFileW(hDrop, i, handle.AddrOfPinnedObject(), size + 1);
paths[i] = new string(chars.AsSpan(0, (int)size));
}
finally
{
if (handle.IsAllocated)
{
handle.Free();
}
}
}
finally
{
ArrayPool <char> .Shared.Return(chars);
}
}
OnFilesDropped(paths);
}
finally
{
Shell32.DragFinish(hDrop);
}
}