73 lines
2.4 KiB
Markdown
73 lines
2.4 KiB
Markdown
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# PerObjectConfig
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- **功能描述：** 在已经有config配置文件名字的情况下，指定应该按每个对象实例来存储值，而不是一个类一个存储值。
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- **引擎模块：** Config
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- **元数据类型：** bool
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- **作用机制：** 在ClassFlags中增加[CLASS_PerObjectConfig](../../../Flags/EClassFlags/CLASS_PerObjectConfig.md)
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- **关联项：** [Config](Config.md)
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- **常用程度：★★★★★**
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在已经有config配置文件名字的情况下，指定应该按每个对象实例来存储值，而不是一个类一个存储值。
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- 此类的配置信息将按对象存储，在.ini文件中，每个对象都有一个分段，根据对象命名，格式为[ObjectName ClassName]。
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- 此说明符会传播到子类。指定该配置是对每个对象都单独保存。
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## 示例代码：
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注意ObjectName必须一致
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```cpp
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UCLASS(Config = Game,PerObjectConfig)
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class INSIDER_API UMyClass_PerObjectConfig :public UObject
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{
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GENERATED_BODY()
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public:
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UPROPERTY(EditAnywhere, BlueprintReadWrite)
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int32 MyProperty = 123;
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Config)
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int32 MyPropertyWithConfig = 123;
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};
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void UMyClass_Config_Test::TestPerObjectConfigSave()
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{
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UMyClass_PerObjectConfig* testObject1 = NewObject<UMyClass_PerObjectConfig>(GetTransientPackage(), TEXT("testObject1"));
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testObject1->MyPropertyWithConfig = 456;
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testObject1->SaveConfig();
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UMyClass_PerObjectConfig* testObject2 = NewObject<UMyClass_PerObjectConfig>(GetTransientPackage(), TEXT("testObject2"));
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testObject2->MyPropertyWithConfig = 789;
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testObject2->SaveConfig();
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}
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void UMyClass_Config_Test::TestPerObjectConfigLoad()
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{
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UMyClass_PerObjectConfig* testObject1 = NewObject<UMyClass_PerObjectConfig>(GetTransientPackage(), TEXT("testObject1"));
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//testObject1->LoadConfig(); //不需要显式调用LoadConfig
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UMyClass_PerObjectConfig* testObject2 = NewObject<UMyClass_PerObjectConfig>(GetTransientPackage(), TEXT("testObject2"));
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//testObject2->LoadConfig();
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}
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//\Saved\Config\WindowsEditor\Game.ini
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[testObject1 MyClass_PerObjectConfig]
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MyPropertyWithConfig=456
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[testObject2 MyClass_PerObjectConfig]
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MyPropertyWithConfig=789
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```
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## 原理：
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对象构造的末期会尝试去读取配置。
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```cpp
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void FObjectInitializer::PostConstructInit()
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{
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//在NewObject构造中后面会调用
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if (bIsCDO || Class->HasAnyClassFlags(CLASS_PerObjectConfig))
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{
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Obj->LoadConfig(NULL, NULL, bIsCDO ? UE::LCPF_ReadParentSections : UE::LCPF_None);
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}
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}
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```
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