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UE4反射编程_虚幻4 获取类名

作者：从前慢现在也慢 | 2024-02-23 03:13:57

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虚幻4 获取类名

UE4 反射编程

文章目录

1. 准备工作

  1. 新建空白ue4 cpp项目：Reflective

  2. 打开ReflectiveGameModeBase.h

    #pragma once

#include "CoreMinimal.h"
#include "GameFramework/GameModeBase.h"
#include "ReflectiveGameModeBase.generated.h"

UCLASS()
class REFLECTIVE_API ReflectiveGameModeBase : public AGameModeBase
{
	GENERATED_UCLASS_BODY()
	
};

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  3. 修改ReflectiveGameModeBase.cpp，创建构造函数

    #include "ReflectiveGameModeBase.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	// Reflection Succeed
	UE_LOG(LogTemp, Log, TEXT("[ Hello Reflective ]"));
}

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  4. 编译运行：

    LogTemp: [ Hello Reflective ]

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2. 获取类名

  1. 创建UE4 None类型 cpp文件：Student

  2. Student.h

    #pragma once

#include "CoreMinimal.h"

class REFLECTIVE_API Student
{
public:
	Student();
    ~Student();
}

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  3. Student.cpp

    #include "Student.h"

Student::Student()
{
}

Student::~Student()
{
}

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  4. 需要进行修改，才能拥有虚幻的反射功能

  5. Student.h

    #pragma once

#include "CoreMinimal.h"
#include "Student.generated.h" // 1. #include "文件名.generated.h"

UCLASS() // 2. UCLASS() 是虚幻提供的类反射
class REFLECTIVE_API UStudent : public UObject // 3. 需要继承UObject才能使用UCALSS(), 类名前面要加U
{
	GENERATED_BODY() // 4. 要加入 GENERATED_BODY()
public:
	UStudent(); // 5. 类名前要统一加U
    // 6. 因为继承UObject，不需要考虑垃圾回收，~Student()不需要
};

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  6. Student.cpp

    #include "Student.h"

UStudent::UStudent() // 1. 类名前加 U
{
}

// 2. 不需要 Student::~Student(){}

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  7. 开始获取类型

  8. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "Student.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	// Get Class Name By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Get Class Name ]"));
	UStudent *Student = NewObject<UStudent>();
	const UClass *StudentClass = Student->GetClass();
	const FName StudentName = StudentClass->GetFName();
	UE_LOG(LogTemp, Warning, TEXT("<-- Class Name: %s -->"), *StudentName.ToString());
}

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  9. 打印结果：

    LogTemp: [ Get Class Name ]
LogTemp: Warning: <-- Class Name: Student -->

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3. 获取类标签

  1. Student.h

    #pragma once

#include "CoreMinimal.h"
#include "Student.generated.h"

UCLASS(BlueprintType) // 此次填入 BlueprintType
class REFLECTIVE_API UStudent : public UObject
{
	GENERATED_BODY()
public:
	UStudent();
};

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  2. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "Student.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
    UStudent *Student = NewObject<UStudent>();
	const UClass *StudentClass = Student->GetClass();
	const FName StudentName = StudentClass->GetFName();

	// Get Class Flags By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Get Class Flags ]"));
	EClassFlags StudentClassFlags = StudentClass->ClassFlags;
	UE_LOG(LogTemp, Warning, TEXT("<-- Class Name: %s, Class Flags: %x -->"),
		*StudentName.ToString(), StudentClassFlags);
}

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  3. 打印结果

    LogTemp: [ Get Class Flags ]
LogTemp: Warning: <-- Class Name: Student, Class Flags: 305000a0 -->

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4. 获取类属性

  1. Student.h

    #pragma once

#include "CoreMinimal.h"
#include "Student.generated.h"

UCLASS(BlueprintType)
class REFLECTIVE_API UStudent : public UObject
{
	GENERATED_BODY()
public:
	UStudent();
    
private: // 添加属性，要加入UPROPERTY()，否则无法参与反射
	UPROPERTY()
	FString Name;

	UPROPERTY()
	FString Country;
};

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  2. Student.cpp

    #include "Student.h"

UStudent::UStudent()
{
	Name = "FHang";
	Country = "China";
}

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  3. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "Student.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
    UStudent *Student = NewObject<UStudent>();
	const UClass *StudentClass = Student->GetClass();

	// Get Class Property Value By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Get Class Property Value ]"))
	for (FProperty *Property = StudentClass->PropertyLink; Property; Property = Property->PropertyLinkNext)
	{
		FString PropertyName = Property->GetName();
		FString PropertyType = Property->GetCPPType();
		
		if (PropertyType == "FString")
		{
			const FStrProperty *StringProperty = CastField<FStrProperty>(Property);
			void *Address = StringProperty->ContainerPtrToValuePtr<void>(Student);
			FString PropertyValue = StringProperty->GetPropertyValue(Address);
			UE_LOG(LogTemp, Warning, TEXT("<-- Class Property: %s, Type: %s, Value: %s-->"),
				*PropertyName, *PropertyType, *PropertyValue);
		}
	}
}

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  4. 打印结果：

    LogTemp: [ Get Class Property Value ]
LogTemp: Warning: <-- Class Property: Name, Type: FString, Value: FHang -->
LogTemp: Warning: <-- Class Property: Country, Type: FString, Value: China -->

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5. 获取类属性元数据

  1. Student.h

    #pragma once

#include "CoreMinimal.h"
#include "Student.generated.h"

UCLASS(BlueprintType)
class REFLECTIVE_API UStudent : public UObject
{
	GENERATED_BODY()
public:
	UStudent();
    
private:
	UPROPERTY(VisibleAnywhere, Category="Info") // 添加元数据
	FString Name;

	UPROPERTY()
	FString Country;
};

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  2. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "Student.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
    UStudent *Student = NewObject<UStudent>();
	const UClass *StudentClass = Student->GetClass();

	// Get Class Property Value By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Get Class Property Value ]"))
	for (FProperty *Property = StudentClass->PropertyLink; Property; Property = Property->PropertyLinkNext)
	{
        // Get Class Property Meta By Reflection
		UE_LOG(LogTemp, Log, TEXT("[ Get Class Property Meta ]"))
		FString PropertyMeta = Property->GetMetaData(TEXT("Category"));
		
		if (PropertyType == "FString")
		{
			const FStrProperty *StringProperty = CastField<FStrProperty>(Property);
			void *Address = StringProperty->ContainerPtrToValuePtr<void>(Student);
			FString PropertyValue = StringProperty->GetPropertyValue(Address);
			UE_LOG(LogTemp, Warning, TEXT("<-- Class Property Meta: %s -->"), *PropertyMeta);
		}
	}
}

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  3. 打印结果：

    LogTemp: [ Get Class Property Value ]
LogTemp: [ Get Class Property Meta ]
LogTemp: Warning: <-- Class Property Meta: Info -->
LogTemp: Warning: <-- Class Property Meta:  -->

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6. 设置类属性值

  1. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "Student.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
    UStudent *Student = NewObject<UStudent>();
	const UClass *StudentClass = Student->GetClass();

	// Get Class Property Value By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Get Class Property Value ]"))
	for (FProperty *Property = StudentClass->PropertyLink; Property; Property = Property->PropertyLinkNext)
	{
		FString PropertyName = Property->GetName();
		FString PropertyType = Property->GetCPPType();
		
		if (PropertyType == "FString")
		{
			const FStrProperty *StringProperty = CastField<FStrProperty>(Property);
			void *Address = StringProperty->ContainerPtrToValuePtr<void>(Student);
			FString PropertyValue = StringProperty->GetPropertyValue(Address);
			UE_LOG(LogTemp, Warning, TEXT("<-- Class Property: %s, Type: %s, Value: %s -->"),
				*PropertyName, *PropertyType, *PropertyValue);
			
			// Set Class Property Value By Reflection
			UE_LOG(LogTemp, Log, TEXT("[ Set Class Property Value ]"))
			StringProperty->SetPropertyValue(Address, "XXXX");
			FString NewStringProperty = StringProperty->GetPropertyValue(Address);
			UE_LOG(LogTemp, Warning, TEXT("<-- Class Property: %s, Type: %s, Value: %s -->"),
				*PropertyName, *PropertyType, *NewStringProperty);
		}
	}
}

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  2. 打印结果：

    LogTemp: [ Get Class Property Value ]
LogTemp: Warning: <-- Class Property: Name, Type: FString, Value: FHang -->
LogTemp: [ Set Class Property Value ]
LogTemp: Warning: <-- Class Property: Name, Type: FString, Value: XXXX -->
LogTemp: Warning: <-- Class Property: Country, Type: FString, Value: China -->
LogTemp: [ Set Class Property Value ]
LogTemp: Warning: <-- Class Property: Country, Type: FString, Value: XXXX -->

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7. 获得类函数名

  1. Student.h

    #pragma once

#include "CoreMinimal.h"
#include "Student.generated.h"

UCLASS(BlueprintType)
class REFLECTIVE_API UStudent : public UObject
{
	GENERATED_BODY()
public:
	UStudent();

private:
	UPROPERTY(VisibleAnywhere, Category="Info")
	FString Name;

	UPROPERTY()
	FString Country;

public:
	UFUNCTION(BlueprintCallable)
	void Study(){};

	UFUNCTION()
	void Demo01(int a, bool isA){};
};

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  2. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "Student.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
    UStudent *Student = NewObject<UStudent>();
	const UClass *StudentClass = Student->GetClass();
    const FName StudentName = StudentClass->GetFName();
	
    // Get Class Function Name By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Get Class Function ]"));
	for (TFieldIterator<UFunction> IteratorOfFunction(StudentClass); IteratorOfFunction; ++IteratorOfFunction)
	{
		const UFunction *Function = *IteratorOfFunction;
		FString FunctionName = Function->GetName();
		if (FunctionName == "ExecuteUbergraph"){continue;}

		UE_LOG(LogTemp, Warning, TEXT("<-- Class: %s, Function: %s -->"), *StudentName.ToString(),
			*FunctionName);
    }
}

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  3. 打印结果：

    LogTemp: [ Get Class Function ]
LogTemp: Warning: <-- Class: Student, Function: Study -->
LogTemp: Warning: <-- Class: Student, Function: Demo01 -->

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8. 获取类函数标签

  1. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "Student.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
    UStudent *Student = NewObject<UStudent>();
	const UClass *StudentClass = Student->GetClass();
    const FName StudentName = StudentClass->GetFName();
	
    // Get Class Function Name By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Get Class Function ]"));
	for (TFieldIterator<UFunction> IteratorOfFunction(StudentClass); IteratorOfFunction; ++IteratorOfFunction)
	{
		const UFunction *Function = *IteratorOfFunction;
		FString FunctionName = Function->GetName();
		if (FunctionName == "ExecuteUbergraph"){continue;}
        		
        // Get Class Function Flags
		UE_LOG(LogTemp, Log, TEXT("[ Get Class Function Flags ]"))
		EFunctionFlags FunctionFlags = Function->FunctionFlags;
		UE_LOG(LogTemp, Warning, TEXT("<-- Class: %s, Function: %s, Flags: %x -->"), *StudentName.ToString(),
			*FunctionName, FunctionFlags);
    }
}

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  2. 打印结果：

    LogTemp: [ Get Class Function ]
LogTemp: [ Get Class Function Flags ]
LogTemp: Warning: <-- Class: Student, Function: Study, Flags: 4020401 -->
LogTemp: [ Get Class Function Flags ]
LogTemp: Warning: <-- Class: Student, Function: Demo01, Flags: 20401 -->

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9. 获取类函数参数

  1. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "Student.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
    UStudent *Student = NewObject<UStudent>();
	const UClass *StudentClass = Student->GetClass();
	
    // Get Class Function Name By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Get Class Function ]"));
	for (TFieldIterator<UFunction> IteratorOfFunction(StudentClass); IteratorOfFunction; ++IteratorOfFunction)
	{
		const UFunction *Function = *IteratorOfFunction;
		FString FunctionName = Function->GetName();
		if (FunctionName == "ExecuteUbergraph"){continue;}
        		
        // Get Class Function Params By Reflection
		UE_LOG(LogTemp, Log, TEXT("[ Get Function Params ]"));
		for (TFieldIterator<FProperty> IteratorOfParams(Function); IteratorOfParams; ++IteratorOfParams)
		{
			const FProperty *Param = *IteratorOfParams;
			FString ParamType = Param->GetCPPType();
			FString ParamName = Param->GetName();
			UE_LOG(LogTemp, Warning, TEXT("<-- Function: %s, ParamType: %s, ParamName: %s -->"),
				*FunctionName, *ParamType, *ParamName);
		}
    }
}

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  2. 打印结果：

    LogTemp: [ Get Class Function ]
LogTemp: [ Get Function Params ]
LogTemp: Warning: <-- Function: Demo01, ParamType: int32, ParamName: a -->
LogTemp: Warning: <-- Function: Demo01, ParamType: bool, ParamName: isA -->

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10. 获取类函数参数标签

  1. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "Student.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
    UStudent *Student = NewObject<UStudent>();
	const UClass *StudentClass = Student->GetClass();
	
    // Get Class Function Name By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Get Class Function ]"));
	for (TFieldIterator<UFunction> IteratorOfFunction(StudentClass); IteratorOfFunction; ++IteratorOfFunction)
	{
		const UFunction *Function = *IteratorOfFunction;
		FString FunctionName = Function->GetName();
		if (FunctionName == "ExecuteUbergraph"){continue;}
        		
        // Get Class Function Params By Reflection
		UE_LOG(LogTemp, Log, TEXT("[ Get Function Params ]"));
		for (TFieldIterator<FProperty> IteratorOfParams(Function); IteratorOfParams; ++IteratorOfParams)
		{
			const FProperty *Param = *IteratorOfParams;

            // Get Function Params Flags By Reflection
			UE_LOG(LogTemp, Log, TEXT("[ Get Params Flags ]"));
			EPropertyFlags ParamFlag = Param->GetPropertyFlags();
			UE_LOG(LogTemp, Warning, TEXT("<-- Function: %s, Flags: %x -->"),
				*FunctionName, ParamFlag);
		}
    }
}

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  2. 打印结果：

    LogTemp: [ Get Class Function ]
LogTemp: [ Get Function Params ]
LogTemp: [ Get Params Flags ]
LogTemp: Warning: <-- Function: Demo01, ParamType: int32, ParamName: a, Flags: 40000280 -->
LogTemp: [ Get Params Flags ]
LogTemp: Warning: <-- Function: Demo01, ParamType: bool, ParamName: isA, Flags: 40000280 -->

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11. 获取父类

  1. 新建Student子类SubStudent

  2. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "SubStudent.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	// Get SubClass FatherClass By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Get FatherClass ]"));
	const USubStudent *SubStudent = NewObject<USubStudent>();
	const UClass *FatherClass = SubStudent->GetClass()->GetSuperClass();
	const FString SubClassName = SubStudent->GetClass()->GetName();
	const FString FatherClassName = FatherClass->GetName();
	UE_LOG(LogTemp, Warning, TEXT("<-- SubClass: %s, SuperClass: %s -->"), *SubClassName, *FatherClassName);
}

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  3. 打印结果：

    LogTemp: [ Get FatherClass ]
LogTemp: Warning: <-- SubClass: SubStudent, SuperClass: Student -->

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12. 判断是否是子类

  1. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "Student.h"
#include "SubStudent.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	// Determine if the current class is a subclass of another class By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Determine Is SubClass ]"));
	const UClass *Class1 = UStudent::StaticClass();
	const UClass *Class2 = USubStudent::StaticClass();
	const UClass *Class3 = AActor::StaticClass();
	if (Class2->IsChildOf(Class1))
	{
		UE_LOG(LogTemp, Warning, TEXT("<-- %s Is %s SubClass -->"), 
			*Class2->GetName(), *Class1->GetName());
	}
	if (!Class3->IsChildOf(Class1))
	{
		UE_LOG(LogTemp, Warning, TEXT("<-- %s Is Not %s SubClass -->"),
			*Class3->GetName(), *Class1->GetName());
	}
}

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  2. 打印结果：

    LogTemp: [ Determine Is SubClass ]
LogTemp: Warning: <-- SubStudent Is Student SubClass -->
LogTemp: Warning: <-- Actor Is Not Student SubClass -->

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13. 查找类的所有子类

  1. 新建Student子类Sub1Student

  2. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "Student.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	const *NewStudent = NewObject<UStudent>();
	const UClass *FatherClass = NewStudent->GetClass();
	
	// Find Current Class All Of SubClass By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Get Current Class All Of SubClass ]"));
	TArray<UClass*> ClassArray;
	GetDerivedClasses(FatherClass, ClassArray, false);
	UE_LOG(LogTemp, Warning, TEXT("<-- SuperClass: %s -->"), *FatherClassName);
	for (const auto &Elem : ClassArray)
	{
		UE_LOG(LogTemp, Warning, TEXT("<-- SubClass: %s -->"), *Elem->GetName());
	}
}

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  3. 打印结果：

    LogTemp: [ Get Current Class All Of SubClass ]
LogTemp: Warning: <-- SuperClass: Student -->
LogTemp: Warning: <-- SubClass: Sub1Student -->
LogTemp: Warning: <-- SubClass: SubStudent -->

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14. 查找类生成的所有对象

  1. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "Sub1Student.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	// Get Current Class Generated Objects By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Get Current Class Generated Objects ]"));
	TArray<UObject*> ObjectsArray;
	USub1Student *Sub1Student = NewObject<USub1Student>(this, FName("Sub1Student"));
	USub1Student *Sub1 = NewObject<USub1Student>(this, FName("Sub1"));
	GetObjectsOfClass(USub1Student::StaticClass(), ObjectsArray, false);
	UE_LOG(LogTemp, Warning, TEXT("<-- Current Class: %s -->"), *Sub1Student->GetName());
	for (const auto &Elem : ObjectsArray)
	{
		UE_LOG(LogTemp, Warning, TEXT("<-- Object: %s -->"), *Elem->GetName());
	}
}

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  2. 打印结果：

    LogTemp: [ Get Current Class Generated Objects ]
LogTemp: Warning: <-- Current Class: Sub1Student -->
LogTemp: Warning: <-- Object: Sub1Student -->
LogTemp: Warning: <-- Object: Sub1 -->

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15. 通过字符串查找类

  1. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	// Use String Find Class By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Use String Find Class ]"));
	UClass *FindedClass = FindObject<UClass>(ANY_PACKAGE, *FString("Student"), true);
	if (FindedClass)
	{
		UE_LOG(LogTemp, Warning, TEXT("<-- Find %s Succeed -->"), *FindedClass->GetName());
	}
}

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  2. 打印结果：

    LogTemp: [ Use String Find Class ]
LogTemp: Warning: <-- Find Student Succeed -->

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16. 通过字符查找枚举

  1. Student.h中定义EStudentType枚举

    #pragma once

#include "CoreMinimal.h"
#include "Student.generated.h"

UENUM()
enum class EStudentType : uint8
{
	E_GOOD UMETA(DisplayName = "GOOD"),
	E_BAD UMETA(DisplayName = "BAD")
};

UCLASS(BlueprintType)
class REFLECTIVE_API UStudent : public UObject
{
	GENERATED_BODY()
public:
	UStudent();

private:
	UPROPERTY(VisibleAnywhere, Category="Info")
	FString Name;

	UPROPERTY()
	FString Country;

public:
	UFUNCTION(BlueprintCallable)
	void Study(){};

	UFUNCTION()
	void Demo01(int a, bool isA){};
};

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  2. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	// Use String Find Enum By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Use String Find Enum ]"));
	UEnum *FindedEnum = FindObject<UEnum>(ANY_PACKAGE, *FString("EStudentType"), true);
	if (FindedEnum)
	{
		UE_LOG(LogTemp, Warning, TEXT("<-- Find %s Succeed -->"), *FindedEnum->GetName());
	}
}

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  3. 打印结果：

    LogTemp: [ Use String Find Enum ]
LogTemp: Warning: <-- Find EStudentType Succeed -->

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17. 获得枚举的所有项

  1. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	// Use String Find Enum By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Use String Find Enum ]"));
	UEnum *FindedEnum = FindObject<UEnum>(ANY_PACKAGE, *FString("EStudentType"), true);
	if (FindedEnum)
	{        		
        // Get Current Enum All Of Elements By Reflection
		UE_LOG(LogTemp, Log, TEXT("[ Get Current Enum All Of Elements ]"));
		UE_LOG(LogTemp, Warning, TEXT("<-- Enum: %s -->"), *FindedEnum->GetName());
		for (int8 Index = 0; Index < FindedEnum->NumEnums(); ++Index)
		{
			UE_LOG(LogTemp, Warning, TEXT("Elem: %s"), *FindedEnum->GetNameStringByIndex(Index));
		}
	}
}

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  2. 打印结果：

    LogTemp: [ Get Current Enum All Of Elements ]
LogTemp: Warning: <-- Enum: EStudentType -->
LogTemp: Warning: Elem: E_GOOD
LogTemp: Warning: Elem: E_BAD
LogTemp: Warning: Elem: E_MAX

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18. 通过字符串查找蓝图类

  1. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	// Use String Find Blueprint Class
	UE_LOG(LogTemp, Log, TEXT("[ Use String Find Blueprint Class ]"));
	UBlueprint *FindedBlueprint = FindObject<UBlueprint>(ANY_PACKAGE, *FString("BP_Student"));
	if (FindedBlueprint)
	{
		UE_LOG(LogTemp, Warning, TEXT("<-- Find %s Succeed -->"), *FindedBlueprint->GetName());
	}
}

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  2. 打印结果：

    LogTemp: [ Use String Find Blueprint Class ]
LogTemp: <-- Find BP_Student Succeed -->

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19. 判断蓝图是否是Native

  1. 在UE中通过Student.cpp类新建BP_Student蓝图类

  2. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	// Use String Find Blueprint Class
	UE_LOG(LogTemp, Log, TEXT("[ Use String Find Blueprint Class ]"));
	UBlueprint *FindedBlueprint = FindObject<UBlueprint>(ANY_PACKAGE, *FString("BP_Student"));
	if (FindedBlueprint)
	{
		// Determine Is BlueprintClass Or Native(Cpp) Class By Reflection
		UE_LOG(LogTemp, Log, TEXT("[ Determine Is BlueprintClass Or Native ]"));
		if (!FindedBlueprint->IsNative())
		{
			UE_LOG(LogTemp, Warning, TEXT("<-- %s Is Blueprint Class -->"), *FindedBlueprint->GetName());
		}
		else
		{
			UE_LOG(LogTemp, Warning, TEXT("<-- %s Is Native Class -->"), *FindedBlueprint->GetName());
		}
	}
}

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  3. 打印结果：

    LogTemp: [ Use String Find Blueprint Class ]
LogTemp: [ Determine Is BlueprintClass Or Native ]
LogTemp: <-- BP_Student Is Blueprint Class -->

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20. 获取所有类

  1. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	// Get All Class By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Get All Class ]"));
	TArray<FString> AllClassNames;
	for (TObjectIterator<UClass> ClassIt; ClassIt; ++ClassIt)
	{
		FString ClassName = ClassIt->GetName();
		AllClassNames.Emplace(ClassName);
	}
	for (const auto &Elem : AllClassNames)
	{
		if (Elem == "Student")
			UE_LOG(LogTemp, Warning, TEXT("<-- %s -->"), *Elem);
	}
}

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  2. 打印结果：

    LogTemp: [ Get All Class ]
LogTemp: Warning: <-- Student -->

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21. 通过字符串查找类函数

  1. SubStudent.h定义函数

    #pragma once

#include "CoreMinimal.h"
#include "Student.h"
#include "SubStudent.generated.h"

UCLASS()
class REFLECTIVE_API USubStudent : public UStudent
{
	GENERATED_BODY()

public:
	UFUNCTION()
	void PlayGame(FString GameName);

	UFUNCTION()
	int IsBoy();
};

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  2. SubStudent.cpp实现函数

    #include "SubStudent.h"

void USubStudent::PlayGame(FString GameName)
{
	UE_LOG(LogTemp, Warning, TEXT("<-- SubStudent::PlayGame(FString)>> Play %s -->"), *GameName);
}

int USubStudent::IsBoy()
{
	UE_LOG(LogTemp, Warning, TEXT("<-- SubStudent::IsBoy>> Is Boy -->"));
	return 1;
}

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  3. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "USubStudent.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	// Use String Find Class Function By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Use String Find Class Function ]"));
	USubStudent *SubStudent01 = NewObject<USubStudent>();
	if (UClass *SubStudent01Class = SubStudent01->GetClass())
	{
		UFunction *SubStudent01Function = SubStudent01Class->FindFunctionByName(
			TEXT("PlayGame"), EIncludeSuperFlag::ExcludeSuper);
		if (SubStudent01Function)
		{
			UE_LOG(LogTemp, Warning, TEXT("<-- Class: %s, Function: %s -->"),
				*SubStudent01->GetClass()->GetName(), *SubStudent01Function->GetName());
		}
    }
}

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  4. 打印结果：

    LogTemp: [ Use String Find Class Function ]
LogTemp: Warning: <-- Class: SubStudent, Function: PlayGame -->

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22. ProcessEvent调用类函数

  1. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "USubStudent.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	// Use String Find Class Function By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Use String Find Class Function ]"));
	USubStudent *SubStudent01 = NewObject<USubStudent>();
	if (UClass *SubStudent01Class = SubStudent01->GetClass())
	{
		UFunction *SubStudent01Function = SubStudent01Class->FindFunctionByName(
			TEXT("PlayGame"), EIncludeSuperFlag::ExcludeSuper);
		if (!SubStudent01Function){break;}
        
		// ProcessEvent Transfer Class Function By Reflection
		UE_LOG(LogTemp, Log, TEXT("[ ProcessEvent Transfer Class Function ]"));
        
		// 1.Allocate Space For Parameters
		uint16 *AllParamMemory = static_cast<uint16*>FMemory_Alloca(SubStudent01Function->ParmsSize);
		FMemory::Memzero(AllParamMemory, SubStudent01Function->ParmsSize);
		
		// 2.Parameter assignment
		for (TFieldIterator<FProperty> IteratorOfParams(SubStudent01Function); IteratorOfParams; ++IteratorOfParams)
		{
			const FProperty *Param = *IteratorOfParams;
			FString ParamName = Param->GetName();
			if (ParamName == FString("GameName"))
			{
				*Param->ContainerPtrToValuePtr<FString>(AllParamMemory) = "CSGO";
			}
		}
        		
        // 3.Call Function(Method)
		SubStudent01->ProcessEvent(SubStudent01Function, AllParamMemory);
    }
}

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  2. 打印结果：

    LogTemp: [ Use String Find Class Function ]
LogTemp: [ ProcessEvent Transfer Class Function ]
LogTemp: Warning: <-- SubStudent::PlayGame(FString)>> Play CSGO -->

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23. Invoke调用类函数

  1. ReflectiveGameModeBase.cpp

    #include "ReflectiveGameModeBase.h"
#include "USubStudent.h"

ReflectiveGameModeBase::ReflectiveGameModeBase(const FObjectInitializer& ObjectInitializer)
	:AGameModeBase(ObjectInitializer)
{
	// Use String Find Class Function By Reflection
	UE_LOG(LogTemp, Log, TEXT("[ Use String Find Class Function ]"));
	USubStudent *SubStudent01 = NewObject<USubStudent>();
	if (UClass *SubStudent01Class = SubStudent01->GetClass())
	{   
		// 	Invoke Transfer Class Function By Reflection
		UE_LOG(LogTemp, Log, TEXT("[ Invoke Transfer Class Function ]"));
		if (UFunction *SubStudent02Function = SubStudent01Class->FindFunctionByName(
			TEXT("IsBoy"), EIncludeSuperFlag::ExcludeSuper))
		{

			// 1.Allocate Space For Parameters
			uint16 *AllParamMemory02 = static_cast<uint16*>FMemory_Alloca(SubStudent02Function->ParmsSize);
			FMemory::Memzero(AllParamMemory02, SubStudent02Function->ParmsSize);

			// 2.Create FFrame
			FFrame Frame(nullptr, SubStudent02Function, &AllParamMemory02);

			// 3.Invoke Function
			SubStudent02Function->Invoke(SubStudent02Function, Frame,
				&AllParamMemory02 + SubStudent02Function->ReturnValueOffset);

			// 4. Get Function Return Value
			int *ReturnValue = reinterpret_cast<int*>(&AllParamMemory02 + SubStudent02Function->ReturnValueOffset);
			UE_LOG(LogTemp, Warning, TEXT("<-- Return Value: %d -->"), *ReturnValue);
		}
    }
}

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  2. 打印结果：

    LogTemp: [ Invoke Transfer Class Function ]
LogTemp: Warning: <-- SubStudent::IsBoy>> Is Boy -->
LogTemp: Warning: <-- Return Value: 1 -->

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bStudent01Class = SubStudent01->GetClass())
{
// Invoke Transfer Class Function By Reflection
UE_LOG(LogTemp, Log, TEXT(“[ Invoke Transfer Class Function ]”));
if (UFunction *SubStudent02Function = SubStudent01Class->FindFunctionByName(
TEXT(“IsBoy”), EIncludeSuperFlag::ExcludeSuper))
{

		// 1.Allocate Space For Parameters
		uint16 *AllParamMemory02 = static_cast<uint16*>FMemory_Alloca(SubStudent02Function->ParmsSize);
		FMemory::Memzero(AllParamMemory02, SubStudent02Function->ParmsSize);

		// 2.Create FFrame
		FFrame Frame(nullptr, SubStudent02Function, &AllParamMemory02);

		// 3.Invoke Function
		SubStudent02Function->Invoke(SubStudent02Function, Frame,
			&AllParamMemory02 + SubStudent02Function->ReturnValueOffset);

		// 4. Get Function Return Value
		int *ReturnValue = reinterpret_cast<int*>(&AllParamMemory02 + SubStudent02Function->ReturnValueOffset);
		UE_LOG(LogTemp, Warning, TEXT("<-- Return Value: %d -->"), *ReturnValue);
	}
   }

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}


2. 打印结果：

```powershell
LogTemp: [ Invoke Transfer Class Function ]
LogTemp: Warning: <-- SubStudent::IsBoy>> Is Boy -->
LogTemp: Warning: <-- Return Value: 1 -->

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