【UE4 C++】 Datatable 读写、导入导出 CSV/Json

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