switched to new way

src/Poe2Trade.Game/ClipboardHelper.cs

@@ -0,0 +1,111 @@
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace Poe2Trade.Game;
+
+/// <summary>
+/// Win32 clipboard access without WinForms dependency.
+/// </summary>
+public static class ClipboardHelper
+{
+    public static string Read()
+    {
+        if (!ClipboardNative.OpenClipboard(IntPtr.Zero))
+            return "";
+
+        try
+        {
+            var handle = ClipboardNative.GetClipboardData(ClipboardNative.CF_UNICODETEXT);
+            if (handle == IntPtr.Zero) return "";
+
+            var ptr = ClipboardNative.GlobalLock(handle);
+            if (ptr == IntPtr.Zero) return "";
+
+            try
+            {
+                return Marshal.PtrToStringUni(ptr) ?? "";
+            }
+            finally
+            {
+                ClipboardNative.GlobalUnlock(handle);
+            }
+        }
+        finally
+        {
+            ClipboardNative.CloseClipboard();
+        }
+    }
+
+    public static void Write(string text)
+    {
+        if (!ClipboardNative.OpenClipboard(IntPtr.Zero))
+            return;
+
+        try
+        {
+            ClipboardNative.EmptyClipboard();
+            var bytes = Encoding.Unicode.GetBytes(text + "\0");
+            var hGlobal = ClipboardNative.GlobalAlloc(ClipboardNative.GMEM_MOVEABLE, (UIntPtr)bytes.Length);
+            if (hGlobal == IntPtr.Zero) return;
+
+            var ptr = ClipboardNative.GlobalLock(hGlobal);
+            if (ptr == IntPtr.Zero)
+            {
+                ClipboardNative.GlobalFree(hGlobal);
+                return;
+            }
+
+            try
+            {
+                Marshal.Copy(bytes, 0, ptr, bytes.Length);
+            }
+            finally
+            {
+                ClipboardNative.GlobalUnlock(hGlobal);
+            }
+
+            ClipboardNative.SetClipboardData(ClipboardNative.CF_UNICODETEXT, hGlobal);
+        }
+        finally
+        {
+            ClipboardNative.CloseClipboard();
+        }
+    }
+}
+
+internal static partial class ClipboardNative
+{
+    public const uint CF_UNICODETEXT = 13;
+    public const uint GMEM_MOVEABLE = 0x0002;
+
+    [LibraryImport("user32.dll")]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    public static partial bool OpenClipboard(IntPtr hWndNewOwner);
+
+    [LibraryImport("user32.dll")]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    public static partial bool CloseClipboard();
+
+    [LibraryImport("user32.dll")]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    public static partial bool EmptyClipboard();
+
+    [LibraryImport("user32.dll")]
+    public static partial IntPtr GetClipboardData(uint uFormat);
+
+    [LibraryImport("user32.dll")]
+    public static partial IntPtr SetClipboardData(uint uFormat, IntPtr hMem);
+
+    [LibraryImport("kernel32.dll")]
+    public static partial IntPtr GlobalAlloc(uint uFlags, UIntPtr dwBytes);
+
+    [LibraryImport("kernel32.dll")]
+    public static partial IntPtr GlobalLock(IntPtr hMem);
+
+    [LibraryImport("kernel32.dll")]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    public static partial bool GlobalUnlock(IntPtr hMem);
+
+    [LibraryImport("kernel32.dll")]
+    public static partial IntPtr GlobalFree(IntPtr hMem);
+}