【UE4 C++】 Datatable 读写、导入导出 CSV/Json

2021-05-08 17:33:45 阅读：810 来源： 互联网

标签：CSVPath TEXT UserInfoDataTable C++ Json UserInfo DataDrive UE4 DT

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);
}

导入导出Json

省略

标签：CSVPath,TEXT,UserInfoDataTable,C++,Json,UserInfo,DataDrive,UE4,DT
来源： https://www.cnblogs.com/shiroe/p/14745783.html

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