48 lines
1.7 KiB
Markdown
48 lines
1.7 KiB
Markdown
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# CommandLineID
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- **功能描述：** 标记UMovieSceneCaptureProtocolBase的子类的协议类型。
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- **使用位置：** UCLASS
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- **引擎模块：** Sequencer
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- **元数据类型：** string="abc"
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- **限制类型：** UMovieSceneCaptureProtocolBase的子类上
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- **常用程度：** ★★
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标记UMovieSceneCaptureProtocolBase的子类的协议类型。
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用来在Sequcencer渲染导出的时候选择到正确的处理类。一般也就引擎内部使用，除非想自己自定义渲染输出的格式协议类。
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## 测试效果：
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## 原理：
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简单来说就是通过选择的格式名字来找到相关的ProtocolType Class
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```cpp
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void UMovieSceneCapture::Initialize(TSharedPtr<FSceneViewport> InSceneViewport, int32 PIEInstance)
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{
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FString ImageProtocolOverrideString;
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if ( FParse::Value( FCommandLine::Get(), TEXT( "-MovieFormat=" ), ImageProtocolOverrideString )
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|| FParse::Value( FCommandLine::Get(), TEXT( "-ImageCaptureProtocol=" ), ImageProtocolOverrideString ) )
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{
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static const TCHAR* const CommandLineIDString = TEXT("CommandLineID");
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TArray<UClass*> AllProtocolTypes = FindAllCaptureProtocolClasses();
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for (UClass* Class : AllProtocolTypes)
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{
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bool bMetaDataMatch = Class->GetMetaData(CommandLineIDString) == ImageProtocolOverrideString;
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if ( bMetaDataMatch || Class->GetName() == ImageProtocolOverrideString )
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{
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OverrideClass = Class;
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}
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}
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ImageCaptureProtocolType = OverrideClass;
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}
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if (FParse::Value( FCommandLine::Get(), TEXT( "-AudioCaptureProtocol=" ), AudioProtocolOverrideString ) )
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{
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static const TCHAR* const CommandLineIDString = TEXT("CommandLineID");
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}
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}
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```
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