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【UnLua】在 Lua 中定义 UE 反射类型

用法

• 启动编辑器时遍历 Defines 目录下 lua 脚本来加载 UE 反射类型（开个临时的 Lua VM 即可）
• 直接像

-- define a uenum in lua
UEnum.EEnumGuestSomethingElse {Value1 = 1;Value2 = 2;
}-- use it like a native uenum
UnLua.Log(UE.EEnumGuestSomethingElse.Value2)UClass { Config = "Game" }.
MoviePipelineExampleRuntimeExecutor(UE.MoviePipelinePythonHostExecutor, UE.IXXXInteface) {activeMoviePipeline = UE.UProperty {};exampleArray = UE.TArray(str);exampleDict = UE.TMap(str, bool);on_map_load = UE.UFunction {override = true;params = { };}
}

====== UEnum ======

C++

UENUM(BlueprintType)
enum class ETest : uint8
{Walking,Running,Sprinting,ALS_MAX UMETA(DisplayName="ALS MAX")
};

Test.generated.h

#include "UObject/ObjectMacros.h"
#include "UObject/ScriptMacros.h"#define FOREACH_ENUM_ETEST(op) \op(ETest::Walking) \op(ETest::Running) \op(ETest::Sprinting) \op(ETest::ALS_MAX)enum class ETest : uint8;
template<> struct TIsUEnumClass<ETest> { enum { Value = true }; };
template<> LYRAGAME_API UEnum* StaticEnum<ETest>();

Test.gen.cpp

• 生成代码入口 FNativeClassHeaderGenerator::ExportGeneratedEnumInitCode
• 构造 UEnum 入口 UECodeGen_Private::ConstructUEnum
• 构造时机：static 注册，所以 C++ 启动时

void EmptyLinkFunctionForGeneratedCodeTest() {}
// Cross Module ReferencesLYRAGAME_API UEnum* Z_Construct_UEnum_LyraGame_ETest();UPackage* Z_Construct_UPackage__Script_LyraGame();
// End Cross Module Referencesstatic FEnumRegistrationInfo Z_Registration_Info_UEnum_ETest;static UEnum* ETest_StaticEnum(){if (!Z_Registration_Info_UEnum_ETest.OuterSingleton){Z_Registration_Info_UEnum_ETest.OuterSingleton = GetStaticEnum(Z_Construct_UEnum_LyraGame_ETest, Z_Construct_UPackage__Script_LyraGame(), TEXT("ETest"));}return Z_Registration_Info_UEnum_ETest.OuterSingleton;}template<> LYRAGAME_API UEnum* StaticEnum<ETest>(){return ETest_StaticEnum();}struct Z_Construct_UEnum_LyraGame_ETest_Statics{static const UECodeGen_Private::FEnumeratorParam Enumerators[];
#if WITH_METADATAstatic const UECodeGen_Private::FMetaDataPairParam Enum_MetaDataParams[];
#endifstatic const UECodeGen_Private::FEnumParams EnumParams;};const UECodeGen_Private::FEnumeratorParam Z_Construct_UEnum_LyraGame_ETest_Statics::Enumerators[] = {{ "ETest::Walking", (int64)ETest::Walking },{ "ETest::Running", (int64)ETest::Running },{ "ETest::Sprinting", (int64)ETest::Sprinting },{ "ETest::ALS_MAX", (int64)ETest::ALS_MAX },};
#if WITH_METADATAconst UECodeGen_Private::FMetaDataPairParam Z_Construct_UEnum_LyraGame_ETest_Statics::Enum_MetaDataParams[] = {{ "ALS_MAX.DisplayName", "ALS MAX" },{ "ALS_MAX.Name", "ETest::ALS_MAX" },{ "BlueprintType", "true" },{ "ModuleRelativePath", "Common/Defines/Test.h" },{ "Running.Name", "ETest::Running" },{ "Sprinting.Name", "ETest::Sprinting" },{ "Walking.Name", "ETest::Walking" },};
#endifconst UECodeGen_Private::FEnumParams Z_Construct_UEnum_LyraGame_ETest_Statics::EnumParams = {(UObject*(*)())Z_Construct_UPackage__Script_LyraGame,nullptr,"ETest","ETest",Z_Construct_UEnum_LyraGame_ETest_Statics::Enumerators,UE_ARRAY_COUNT(Z_Construct_UEnum_LyraGame_ETest_Statics::Enumerators),RF_Public|RF_Transient|RF_MarkAsNative,EEnumFlags::None,(uint8)UEnum::ECppForm::EnumClass,METADATA_PARAMS(Z_Construct_UEnum_LyraGame_ETest_Statics::Enum_MetaDataParams, UE_ARRAY_COUNT(Z_Construct_UEnum_LyraGame_ETest_Statics::Enum_MetaDataParams))};UEnum* Z_Construct_UEnum_LyraGame_ETest(){if (!Z_Registration_Info_UEnum_ETest.InnerSingleton){UECodeGen_Private::ConstructUEnum(Z_Registration_Info_UEnum_ETest.InnerSingleton, Z_Construct_UEnum_LyraGame_ETest_Statics::EnumParams);}return Z_Registration_Info_UEnum_ETest.InnerSingleton;}struct Z_CompiledInDeferFile_FID_Lyra_Source_LyraGame_Common_Defines_Test_h_Statics{static const FEnumRegisterCompiledInInfo EnumInfo[];};const FEnumRegisterCompiledInInfo Z_CompiledInDeferFile_FID_Lyra_Source_LyraGame_Common_Defines_Test_h_Statics::EnumInfo[] = {{ ETest_StaticEnum, TEXT("ETest"), &Z_Registration_Info_UEnum_ETest, CONSTRUCT_RELOAD_VERSION_INFO(FEnumReloadVersionInfo, 2142314138U) },};static FRegisterCompiledInInfo Z_CompiledInDeferFile_FID_Lyra_Source_LyraGame_Common_Defines_Test_h_3878057739(TEXT("/Script/LyraGame"),nullptr, 0,nullptr, 0,Z_CompiledInDeferFile_FID_Lyra_Source_LyraGame_Common_Defines_Test_h_Statics::EnumInfo, UE_ARRAY_COUNT(Z_CompiledInDeferFile_FID_Lyra_Source_LyraGame_Common_Defines_Test_h_Statics::EnumInfo));

Python

• 创建入口 FPythonGeneratedEnumBuilder::RegisterDescriptors
• 创建时机 uenum -> GenerateEnum

@unreal.uenum()
class PyTestColor(unreal.EnumBase):RED = unreal.uvalue(1, meta={"DisplayName": "Red (255, 0, 0)"})GREEN = unreal.uvalue(2)BLUE = unreal.uvalue(3)

====== UStruct ======

====== UClass ======