【UE4 C++】 Datatable 读写、导入导出 CSV/Json

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Datatable 读取行数据

1. 创建结构体

继承自 FTableRowBase

USTRUCT(BlueprintType)

struct  FSimpleStruct :public FTableRowBase

{

	GENERATED_USTRUCT_BODY()

public:

	UPROPERTY(EditAnywhere)

		FString name;

	UPROPERTY(EditAnywhere)

		int32 health;

	UPROPERTY(EditAnywhere)

		UTexture2D* icon;

};

2. 创建 Datatable

选择 FSimpleStruct 结构体

3. 读取行数据

FindRow

UserInfoDataTable = LoadObject<UDataTable>(this, TEXT("DataTable'/Game/CPPFunction/DataDrive/DT_UserInfo.DT_UserInfo'"));

if (UserInfoDataTable)

{

	for (FName RowName : UserInfoDataTable->GetRowNames())

	{

		FSimpleStruct* UserInfo = UserInfoDataTable->FindRow<FSimpleStruct>(RowName, TEXT("name"));

		if (UserInfo)

		{

			UKismetSystemLibrary::PrintString(GetWorld(), UserInfo->name);

		}

	}

}

else

{

	UKismetSystemLibrary::PrintString(GetWorld(), TEXT(" Not Find DataTable!"));

}

GetRowMap

UserInfoDataTable = LoadObject<UDataTable>(this, TEXT("DataTable'/Game/CPPFunction/DataDrive/DT_UserInfo.DT_UserInfo'"));

if (UserInfoDataTable)

{

	for (auto it : UserInfoDataTable->GetRowMap())

	{

		FString RowName = (it.Key).ToString();

		FSimpleStruct* UserInfo = (FSimpleStruct*)it.Value;

		UKismetSystemLibrary::PrintString(GetWorld(), FString::Printf(TEXT("%s %s"), *RowName, *UserInfo->name));

	}

}

Datatable 写入行数据

AddRow

UserInfoDataTable = LoadObject<UDataTable>(this, TEXT("DataTable'/Game/CPPFunction/DataDrive/DT_UserInfo.DT_UserInfo'"));

if (UserInfoDataTable)

{

	FSimpleStruct* UserInfo = new FSimpleStruct();

	UserInfo->name = TEXT("Lily");

	UserInfo->health = 80;

	FName RowName = TEXT("Player3");

	UserInfoDataTable->AddRow(RowName, *UserInfo);

}

导入CSV

csv 文件

---,name,health,icon

Player4,"马克","200","Texture2D'/Game/FourEvilDragonsHP/Textures/DragonTheUsurper/BlueHPTex.BlueHPTex'"

Player5,"冉冰","90","Texture2D'/Game/FourEvilDragonsHP/Textures/DragonTheSoulEater/BlueHPTex.BlueHPTex'"

Player6,"墨城","150","None"

填充现有的 DataTable

UserInfoDataTable = LoadObject<UDataTable>(this, TEXT("DataTable'/Game/CPPFunction/DataDrive/DT_UserInfo.DT_UserInfo'"));

if (UserInfoDataTable)

{

	FString CSVPath = FPaths::ProjectDir() + TEXT("DataDrive/UserInfo.csv");

	CSVPath = FPaths::ConvertRelativePathToFull(CSVPath);

	if (FPlatformFileManager::Get().GetPlatformFile().FileExists(*CSVPath))

	{

		UDataTableFunctionLibrary::FillDataTableFromCSVFile(UserInfoDataTable, CSVPath);

	}

}

生成 UDataTable

UDataTable* ADataDriveActor::CreateDataTableFromCSV()

{

	FString CSVPath = FPaths::ProjectDir() + TEXT("DataDrive/UserInfo.csv");

	CSVPath = FPaths::ConvertRelativePathToFull(CSVPath);

	if (FPlatformFileManager::Get().GetPlatformFile().FileExists(*CSVPath))

	{

		UKismetSystemLibrary::PrintString(GetWorld(), *CSVPath);

		FString CSVData;

		FFileHelper::LoadFileToString(CSVData, *CSVPath);

		UDataTable* DT_UserInfo = NewObject<UDataTable>(GetTransientPackage(), FName(TEXT("DT_UserInfo2")));

		DT_UserInfo->RowStruct = FSimpleStruct::StaticStruct();

		DT_UserInfo->CreateTableFromCSVString(CSVData);

		return DT_UserInfo;

	}

	return nullptr;

}

导出 CSV

GetTableAsCSV

UserInfoDataTable = LoadObject<UDataTable>(this, TEXT("DataTable'/Game/CPPFunction/DataDrive/DT_UserInfo.DT_UserInfo'"));

if (UserInfoDataTable)

{

	FString CSVString = UserInfoDataTable->GetTableAsCSV();

	FString CSVPath = FPaths::ProjectDir() + TEXT("DataDrive/UserInfo2.csv");

	FFileHelper::SaveStringToFile(CSVString, *CSVPath, FFileHelper::EEncodingOptions::ForceUTF8);

}