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Close| gcHandle | The handle associated with the pinned object. |
Releases a GC handle obtained from UnsafeUtility.PinGCObjectAndGetAddress or UnsafeUtility.PinGCArrayAndGetDataAddress.
The ReleaseGCObject method unpins an object, allowing the garbage collector to manage its memory freely. Use this method to prevent resource leaks. Ensure you release each handle after finishing direct memory operations.
using Unity.Collections.LowLevel.Unsafe; using UnityEngine;
public class ReleaseGCObjectExample : MonoBehaviour { private struct MyStruct { public int value; }
void Start() { // Box a struct object boxedStruct = new MyStruct { value = 10 };
// Pin the object and get a GC handle unsafe { void* dataPtr = UnsafeUtility.PinGCObjectAndGetAddress(boxedStruct, out ulong gcHandle);
// Access and modify data int objectHeaderSize = UnsafeUtility.SizeOf<long>() * 2; int* valuePtr = (int*)((byte*)dataPtr + objectHeaderSize); *valuePtr = 20;
// Release the GC handle UnsafeUtility.ReleaseGCObject(gcHandle); }
// Verify modification MyStruct modifiedStruct = (MyStruct)boxedStruct; Debug.Log($"Modified value: {modifiedStruct.value}"); // Outputs: 20
// Confirm handle release Debug.Log("GC handle released."); } }
Additional resources: UnsafeUtility.PinGCObjectAndGetAddress, UnsafeUtility.PinGCArrayAndGetDataAddress.
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