UE开发随笔------json与struct互相转换(FJsonObjectConverter)

面包大师2024-06-20 11:55

UStruct定义：

cpp 复制代码

USTRUCT()
struct FHeartBeatMsg
{
	GENERATED_BODY()
public:
	UPROPERTY()
	FString pcCode = TEXT("");
	UPROPERTY()
	FString deviceType = TEXT("");
	UPROPERTY()
	FString messageType = TEXT("");
	UPROPERTY()
	FString content = TEXT("");
};

使用相应转换函数需要添加相关插件模块，Json、JsonUtilities：

cpp 复制代码

		PrivateDependencyModuleNames.AddRange(
			new string[]
			{
				"CoreUObject",
				"Engine",
				"Json",
                "JsonUtilities"
			}
			);

一、json转换为struct

1、json字符串转换为struct

cpp 复制代码

    //FString JsonStr
	FHeartBeatMsg sRecMsg;
	FJsonObjectConverter::JsonObjectStringToUStruct<FHeartBeatMsg>(JsonStr, &sRecMsg, 0, 0);

2、json object转换为struct

cpp 复制代码

	FHeartBeatMsg sRecMsg;
	FJsonObjectConverter::JsonObjectToUStruct<FHeartBeatMsg>(RootObj.ToSharedRef(), &sRecMsg, 0, 0);

附加：json字符串转json object

cpp 复制代码

	//FString JsonStr
    TSharedRef<TJsonReader<TCHAR>> JsonReader = TJsonReaderFactory<TCHAR>::Create(JsonStr);
	TSharedPtr<FJsonObject> RootObj = MakeShareable(new FJsonObject);
	if (!FJsonSerializer::Deserialize(JsonReader, RootObj))
	{
		return;
	}

二、struct转换为json字符串

cpp 复制代码

	FHeartBeatMsg sHeartBeatMsg;
	sHeartBeatMsg.pcCode = TEXT("123");
	sHeartBeatMsg.content = TEXT("test");;

	FString ContentJsonString;
	bool bRet = FJsonObjectConverter::UStructToJsonObjectString(FHeartBeatMsg::StaticStruct(), &sHeartBeatMsg, ContentJsonString, 0, 0);

	if (!bRet)
	{
		//UE_LOG
		return;
	}

注意字符串大小写

UE开发随笔------json与struct互相转换(FJsonObjectConverter)

相关头文件引入：

一、json转换为struct

二、struct转换为json字符串