WINUI3 Receive another app postmessage exception

[0exception]

Describe the bug

Marshal.PtrToStringAnsi

Steps to reproduce the bug

1、 a app called sendmessage
var messageBytes = Encoding.UTF8.GetBytes(message);
var messagePtr = Marshal.AllocHGlobal(messageBytes.Length + 1);
Marshal.Copy(messageBytes, 0, messagePtr, messageBytes.Length);
var targetHandle = NativeMethods.FindWindow(null, "AppDisplayName".GetLocalized());
if (targetHandle != IntPtr.Zero)
{
NativeMethods.PostMessage(targetHandle, NativeMethods.WM_MY_MESSAGE, IntPtr.Zero, messagePtr);
Marshal.FreeHGlobal(messagePtr);
}
2、b app receive
var msg = Marshal.PtrToStringAnsi(lParam); ///exception here

System.AccessViolationException:“Attempted to read or write protected memory. This is often an indication that other memory is corrupt.”

Expected behavior

No response

Screenshots

NuGet package version

None

Packaging type

Unpackaged

Windows version

No response

IDE

Visual Studio 2022

Additional context

No response

[castorix]

A pointer in a process has no meaning in another process
Use methods like System.IO.MemoryMappedFiles or WM_COPYDATA

[0exception]

A pointer in a process has no meaning in another process Use methods like System.IO.MemoryMappedFiles or WM_COPYDATA

i tried WM_COPYDATA , but i can not receive WM_COPYDATA message at all,

[castorix]

i tried WM_COPYDATA , but i can not receive WM_COPYDATA message at all,

Yes, weird, I just tested with an old app and I only receive it in the same instance
But Memory MappedFiles work (I tested with similar code as VB code I had posted in WinForms in this thread (Nov 6, 2021, 4:28 PM))