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Fix "Handle is not initialized" for Unity 2021.2.x games #232

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Merged
ManlyMarco merged 3 commits into from
Sep 2, 2025
Merged

Fix "Handle is not initialized" for Unity 2021.2.x games #232

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404bcf7
Adds a Garbage Collector Handle fallback for Unity 2021.2.x
haolink Aug 29, 2025
7fc1cbc
Fix formatting.
haolink Sep 1, 2025
fba494a
Update Il2CppInterop.Runtime/Runtime/ClassInjectorBase.cs
ManlyMarco Sep 2, 2025
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23 changes: 23 additions & 0 deletions Il2CppInterop.Runtime/Runtime/ClassInjectorBase.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,9 +13,32 @@ public static class ClassInjectorBase
public static object GetMonoObjectFromIl2CppPointer(IntPtr pointer)
{
var gcHandle = GetGcHandlePtrFromIl2CppObject(pointer);

if (gcHandle == IntPtr.Zero) // The Garbage collector handle might return a null pointer
{
gcHandle = FallbackGetGcHandlePtrFromIl2CppDelegateMTarget(pointer);
}

return GCHandle.FromIntPtr(gcHandle).Target;
}

/// <summary>
/// Tries to get the Garbage collector pointer from the m_target object from the m_target of the delegate.
/// Fixes Harmony in Unity 2021.2.x .
/// </summary>
/// <param name="pointer"></param>
/// <returns></returns>
private static IntPtr FallbackGetGcHandlePtrFromIl2CppDelegateMTarget(IntPtr pointer)
{
if (IL2CPP.il2cpp_class_is_assignable_from(Il2CppClassPointerStore<Il2CppSystem.MulticastDelegate>.NativeClassPtr, IL2CPP.il2cpp_object_get_class(pointer)))
{
var delegateObject = new Il2CppSystem.Delegate(pointer);
if (delegateObject.m_target != null && delegateObject.m_target.Pointer != IntPtr.Zero)
return GetGcHandlePtrFromIl2CppObject(delegateObject.m_target.Pointer);
}
return IntPtr.Zero;
}

public static unsafe IntPtr GetGcHandlePtrFromIl2CppObject(IntPtr pointer)
{
return GetInjectedData(pointer)->managedGcHandle;
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