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03-UnrealEngine/Gameplay/UObject/大钊提供的一种获取UE Private函数的方法.md
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197
03-UnrealEngine/Gameplay/UObject/大钊提供的一种获取UE Private函数的方法.md
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---
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title: 大钊提供的一种获取UE Private函数的方法
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date: 2022-12-09 14:51:47
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excerpt: 摘要
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tags:
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rating: ⭐⭐
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---
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## Hacker.h
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```c++
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// Copyright (c) 2015 fjz13. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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#pragma once
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#include "MedusaCorePreDeclares.h"
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MEDUSA_BEGIN;
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namespace Hacker
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{
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//used to steal class private member
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template<typename Tag, typename Tag::type M>
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struct PrivateMemberStealer
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{
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friend typename Tag::type GetPrivate(Tag) { return M; }
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};
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}
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MEDUSA_END;
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#define MEDUSA_STEAL_PRIVATE_MEMBER(className,memberType,memberName) \
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namespace Medusa{namespace Hacker{\
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struct className##_##memberName \
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{\
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typedef memberType className::*type;\
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friend type GetPrivate(className##_##memberName);\
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};\
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template struct PrivateMemberStealer<className##_##memberName, &className::memberName>;\
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}}
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#define MEDUSA_REF_PRIVATE_MEMBER(obj,className,memberName) obj->*GetPrivate(::Medusa::Hacker::className##_##memberName())
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#define MEDUSA_VAR_PRIVATE_MEMBER(var,obj,className,memberName) auto& var=obj->*(GetPrivate(::Medusa::Hacker::className##_##memberName()));
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#define MEDUSA_STEAL_PRIVATE_FUNCTION(className,memberName,returnType,...) \
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namespace Medusa{namespace Hacker{\
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struct className##_##memberName \
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{\
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typedef returnType (className::*type)(__VA_ARGS__);\
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friend type GetPrivate(className##_##memberName);\
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};\
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template struct PrivateMemberStealer<className##_##memberName, &className::memberName>;\
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}}
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#define MEDUSA_REF_PRIVATE_FUNCTION(obj,className,memberName) GetPrivate(::Medusa::Hacker::className##_##memberName())
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#define MEDUSA_PRIVATE_FUNCTION_CALL(obj,className,memberName,...) {auto func=GetPrivate(::Medusa::Hacker::className##_##memberName());(obj->*func)(__VA_ARGS__);}
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```
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## AbcInjection.h
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```c++
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#pragma once
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#include "AbcMagicPreCompiled.h"
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#include "Core/Collection/List.h"
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namespace AbcInjection
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{
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void SetMatrixSamples(UGeometryCacheTrack* obj, const FMatrix* MatricesPtr, int32 MatricesCount, const float* SampleTimesPtr, int32 SampleTimesCount);
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void AddMatrixSample(UGeometryCacheTrack* obj, const FMatrix& Matrix, const float SampleTime);
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void ReserverMatrixSampleSize(UGeometryCacheTrack* obj, int32 size);
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void SetNumMaterials(UGeometryCacheTrack* obj, uint32 val);
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void ReserveSamples(UGeometryCacheTrack_FlipbookAnimation* obj,uint32 count);
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FGeometryCacheMeshData& MutableMeshSampleData(UGeometryCacheTrack_FlipbookAnimation* obj, uint32 index);
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void SetMeshSampleTime(UGeometryCacheTrack_FlipbookAnimation* obj, uint32 index, float time);
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FGeometryCacheMeshData& MutableMeshData(UGeometryCacheTrack_TransformAnimation* obj);
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void RegisterMorphTargets(USkeletalMesh* obj,const Medusa::List<UMorphTarget*>& MorphTargets);
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}
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```
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## AbcInjection.cpp
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```c++
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#include "AbcInjection.h"
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#include "AbcMagicPreCompiled.h"
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#include "GeometryCacheTrack.h"
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#include "GeometryCacheTrackFlipbookAnimation.h"
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#include "GeometryCacheTrackTransformAnimation.h"
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#include "Engine/SkeletalMesh.h"
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#include "Animation/MorphTarget.h"
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#include "Core/Compile/Hacker.h"
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MEDUSA_STEAL_PRIVATE_MEMBER(UGeometryCacheTrack, TArray<FMatrix>, MatrixSamples);
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MEDUSA_STEAL_PRIVATE_MEMBER(UGeometryCacheTrack, TArray<float>, MatrixSampleTimes);
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MEDUSA_STEAL_PRIVATE_MEMBER(UGeometryCacheTrack, uint32, NumMaterials);
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MEDUSA_STEAL_PRIVATE_MEMBER(UGeometryCacheTrack_FlipbookAnimation, TArray<FGeometryCacheMeshData>, MeshSamples);
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MEDUSA_STEAL_PRIVATE_MEMBER(UGeometryCacheTrack_FlipbookAnimation, TArray<float>, MeshSampleTimes);
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MEDUSA_STEAL_PRIVATE_MEMBER(UGeometryCacheTrack_FlipbookAnimation, uint32, NumMeshSamples);
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MEDUSA_STEAL_PRIVATE_MEMBER(UGeometryCacheTrack_TransformAnimation, FGeometryCacheMeshData, MeshData);
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MEDUSA_STEAL_PRIVATE_MEMBER(USkeletalMesh, TArray<UMorphTarget*>, MorphTargets);
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#ifdef ALEMBIC_CORE_419
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MEDUSA_STEAL_PRIVATE_FUNCTION(USkeletalMesh, InvalidateRenderData, void);
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#endif
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namespace AbcInjection
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{
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void SetMatrixSamples(UGeometryCacheTrack* obj, const FMatrix* MatricesPtr, int32 MatricesCount, const float* SampleTimesPtr, int32 SampleTimesCount)
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{
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MEDUSA_VAR_PRIVATE_MEMBER(matrixSamples, obj, UGeometryCacheTrack, MatrixSamples);
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MEDUSA_VAR_PRIVATE_MEMBER(matrixSampleTimes, obj, UGeometryCacheTrack, MatrixSampleTimes);
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matrixSamples.Append(MatricesPtr, MatricesCount);
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matrixSampleTimes.Append(SampleTimesPtr, SampleTimesCount);
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}
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void AddMatrixSample(UGeometryCacheTrack* obj, const FMatrix& Matrix, const float SampleTime)
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{
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MEDUSA_VAR_PRIVATE_MEMBER(matrixSamples, obj, UGeometryCacheTrack, MatrixSamples);
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MEDUSA_VAR_PRIVATE_MEMBER(matrixSampleTimes, obj, UGeometryCacheTrack, MatrixSampleTimes);
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matrixSamples.Add(Matrix);
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matrixSampleTimes.Add(SampleTime);
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}
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void ReserverMatrixSampleSize(UGeometryCacheTrack* obj, int32 size)
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{
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MEDUSA_VAR_PRIVATE_MEMBER(matrixSamples, obj, UGeometryCacheTrack, MatrixSamples);
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MEDUSA_VAR_PRIVATE_MEMBER(matrixSampleTimes, obj, UGeometryCacheTrack, MatrixSampleTimes);
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matrixSamples.Reserve(size);
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matrixSampleTimes.Reserve(size);
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}
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void SetNumMaterials(UGeometryCacheTrack* obj, uint32 val)
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{
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MEDUSA_REF_PRIVATE_MEMBER(obj, UGeometryCacheTrack, NumMaterials) = val;
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}
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void ReserveSamples(UGeometryCacheTrack_FlipbookAnimation* obj, uint32 count)
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{
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MEDUSA_VAR_PRIVATE_MEMBER(meshSamples, obj, UGeometryCacheTrack_FlipbookAnimation, MeshSamples);
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MEDUSA_VAR_PRIVATE_MEMBER(meshSampleTimes, obj, UGeometryCacheTrack_FlipbookAnimation, MeshSampleTimes);
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MEDUSA_VAR_PRIVATE_MEMBER(numMeshSamples, obj, UGeometryCacheTrack_FlipbookAnimation, NumMeshSamples);
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meshSamples.AddDefaulted(count);
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meshSampleTimes.AddDefaulted(count);
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numMeshSamples++;
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}
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FGeometryCacheMeshData& MutableMeshSampleData(UGeometryCacheTrack_FlipbookAnimation* obj, uint32 index)
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{
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MEDUSA_VAR_PRIVATE_MEMBER(meshSamples, obj, UGeometryCacheTrack_FlipbookAnimation, MeshSamples);
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return meshSamples[index];
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}
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void SetMeshSampleTime(UGeometryCacheTrack_FlipbookAnimation* obj, uint32 index, float time)
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{
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MEDUSA_VAR_PRIVATE_MEMBER(meshSampleTimes, obj, UGeometryCacheTrack_FlipbookAnimation, MeshSampleTimes);
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meshSampleTimes[index] = time;
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}
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FGeometryCacheMeshData& MutableMeshData(UGeometryCacheTrack_TransformAnimation* obj)
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{
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MEDUSA_VAR_PRIVATE_MEMBER(meshData, obj, UGeometryCacheTrack_TransformAnimation, MeshData);
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return meshData;
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}
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void RegisterMorphTargets(USkeletalMesh* obj, const Medusa::List<UMorphTarget*>& MorphTargets)
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{
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MEDUSA_VAR_PRIVATE_MEMBER(morphTargets, obj, USkeletalMesh, MorphTargets);
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for (UMorphTarget* morphTarget : MorphTargets)
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{
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morphTarget->BaseSkelMesh = obj;
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morphTarget->MarkPackageDirty();
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morphTargets.Add(morphTarget);
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}
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obj->MarkPackageDirty();
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// need to refresh the map
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obj->InitMorphTargets();
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// invalidate render data
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#ifdef ALEMBIC_CORE_419
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MEDUSA_PRIVATE_FUNCTION_CALL(obj, USkeletalMesh, InvalidateRenderData);
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#endif
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}
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}
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```
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