UE4基础使用C++JSON字符串

1、在[Project].Build.cs文件中添加Module

添加Json这个module

PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore", "Json"});

2、解析

1.  
   FString jsonStr;
2.  
   bool result = FFileHelper::LoadFileToString(jsonStr, fullPath.GetCharArray().GetData(), FFileHelper::EHashOptions::None, 0);
3.  
   //GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Orange, FString::Printf(TEXT("jsonStr is: %s"), *jsonStr));
4.  
   TSharedPtr<FJsonObject> jsonObject = MakeShareable(new FJsonObject);
5.  
    
6.  
   TSharedRef<TJsonReader<>> Reader = TJsonReaderFactory<>::Create(jsonStr);
7.  
   if (!FJsonSerializer::Deserialize(Reader, jsonObject))
8.  
   {
9.  
   UE_LOG(LogTemp, Error, TEXT("JSON_PARSE_FAIL"));
10.  
    return;
11.  
    }
12.  
    else
13.  
    {
14.  
    this->name = jsonObject->GetStringField("name");
15.  
    //GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Orange, FString::Printf(TEXT("name is: %s"), *name));
16.  
    this->imgPath = jsonObject->GetStringField("imgPath");
17.  
    this->midiPath = jsonObject->GetStringField("midiPath");
18.  
    TArray< TSharedPtr< FJsonValue > > jsonArr = jsonObject->GetArrayField("mappingArr");
19.  
    for (auto& jsonValue : jsonArr)
20.  
    {
21.  
    FEventNoteDrumMapping eventNoteDrumMapping;
22.  
    eventNoteDrumMapping.channel = jsonValue->AsObject()->GetIntegerField("channel");
23.  
    eventNoteDrumMapping.note = jsonValue->AsObject()->GetIntegerField("note");
24.  
    }
25.  
    }

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