@Author: 白袍小道
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案例一:蓝图传递任意Struct ,导出struct的相关属性
相关:
1、宏:DECLARE_FUNCTION: 此宏用于在自动生成的样板代码中声明thunk函数
2、通配符检查:CustomThunk、CustomStructureParam
3、FFRame (ObjectMacros.h)
结果:
代码:
1、说明
其中通过CustomStructureParam和CustomThunk ,Declare_FUN实现通配符检查函数,实现Uproperty传递和检查。
CustomStructureParam |
列出的参数都被视为通配符。这个说明符需要ufunction级别的说明符CustomThunk,它要求用户提供一个自定义的exec函数。在这个函数中, 可以检查参数类型,并根据这些参数类型进行适当的函数调用。 不应该调用基本UFUNCTION,如果有错误,应该断言或记录错误。 |
DECLARE_FUNCTION |
#define DECLARE_FUNCTION(func) void func( FFrame& Stack, RESULT_DECL ) |
2、继承关系
UObjectBase
----Uproperty
------UFiled
3、实现
XXX.h
USTRUCT(BlueprintType) struct FTrimmedKeyMapNameType { GENERATED_BODY() public: UPROPERTY(BlueprintReadWrite) FString mTypeName; UPROPERTY(BlueprintReadWrite) TMap<FString,FString> mPropertyNameMapType; };
UCLASS(BlueprintType) class UObjectFunLib : public UBlueprintFunctionLibrary { GENERATED_UCLASS_BODY() public:
UFUNCTION(BlueprintCallable, CustomThunk,meta=(DisplayName="GetStructPropertyNameList",CustomStructureParam="AnyStruct"),Category = "DZToolkit|ObjectFunLib|Property") static FTrimmedKeyMapNameType GetStructPropertyNameList(UProperty* AnyStruct); DECLARE_FUNCTION(execGetStructPropertyNameList) { //Get properties and pointers from stack (nb, it's reverse order, right to left!) Stack.StepCompiledIn<UStructProperty>(NULL); UStructProperty* StructProp = ExactCast<UStructProperty>(Stack.MostRecentProperty); void* StructPtr = Stack.MostRecentPropertyAddress;
P_FINISH;
P_NATIVE_BEGIN; *(FTrimmedKeyMapNameType*)RESULT_PARAM = UObjectFunLib::NativeGetStructPropertyNameList(StructProp->Struct, StructPtr,true); P_NATIVE_END; }
static FTrimmedKeyMapNameType NativeGetStructPropertyNameList(UScriptStruct* pStruct, void* StructPtr,bool IsBlueprintStruct); static void SetTrimmedKeyMapForStruct(TSharedPtr<FTrimmedKeyMapNameType>& InMap, UStruct* pStruct); }; |
XXX.CPP
FTrimmedKeyMapNameType UObjectFunLib::NativeGetStructPropertyNameList(UScriptStruct * pStruct, void * StructPtr, bool IsBlueprintStruct) { TSharedPtr<FTrimmedKeyMapNameType> vProptyShare = MakeShareable<FTrimmedKeyMapNameType>(new FTrimmedKeyMapNameType()); SetTrimmedKeyMapForStruct(vProptyShare, pStruct); return *vProptyShare; }
void UObjectFunLib::SetTrimmedKeyMapForStruct(TSharedPtr<FTrimmedKeyMapNameType>& InMap, UStruct * pStruct) { UField* FieldPtr = pStruct->Children; InMap->mTypeName = pStruct->GetName(); while (FieldPtr != nullptr) { if (FieldPtr->GetClass() != nullptr) { InMap->mPropertyNameMapType.Add(FieldPtr->GetName(), FieldPtr->GetClass()->GetName()); } else { InMap->mPropertyNameMapType.Add(FieldPtr->GetName(),""); } /*UStructProperty* SubStruct = Cast<UStructProperty>(FieldPtr); if (SubStruct != nullptr) { return; } UArrayProperty* ArrayProp = Cast<UArrayProperty>(FieldPtr); if (ArrayProp != nullptr) { return; } UMapProperty* MapProperty = Cast<UMapProperty>(FieldPtr); if (MapProperty != nullptr) { return; }*/
FieldPtr = FieldPtr->Next; } } |