CoreMisc.h

读取

FFileHelper::LoadFileToString

读取全部内容，存到 FString

FString TextPath = FPaths::ProjectDir() + TEXT("DataDrive/Dialogue.txt");

TextPath = FPaths::ConvertRelativePathToFull(TextPath);

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

{

	FString TextData;

	FFileHelper::LoadFileToString(TextData, *TextPath);

	UE_LOG(LogTemp, Warning,TEXT("%s"), *TextData);

}

FFileHelper::LoadFileToStringArray

读读取全部内容，存到 TArray中，每个元素代表一行

FString TextPath = FPaths::ProjectDir() + TEXT("DataDrive/Dialogue.txt");

	TextPath = FPaths::ConvertRelativePathToFull(TextPath);

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

	{

		TArray<FString> TextData;

		FFileHelper::LoadFileToStringArray(TextData, *TextPath);

		int32 line = 0;

		for (FString lineContent : TextData)

		{

			UE_LOG(LogTemp, Warning, TEXT("[line %d] %s"), ++line, *lineContent);

		}

	}

写入

SaveStringToFile

字符串写入文件，需要手动嘉 \n 换行
注意字符编码
注意WriteFlags，参考下面 EFileWrite 枚举

Syntax

enum EFileWrite

 {

     FILEWRITE_NoFail            = 0x01,

     FILEWRITE_NoReplaceExisting = 0x02,

     FILEWRITE_EvenIfReadOnly    = 0x04,

     FILEWRITE_Append            = 0x08,

     FILEWRITE_AllowRead         = 0x10

 };

bool FFileHelper::SaveStringToFile( FStringView String, const TCHAR* Filename,  EEncodingOptions EncodingOptions, IFileManager* FileManager /*= &IFileManager::Get()*/, uint32 WriteFlags )

代码实现

FString TextContent = TEXT("明知无法战胜，明知毫无意义，但还是持续挑战着的姿态，那正是我的过错。----英灵卫宫 \n");

FFileHelper::SaveStringToFile(TextContent, *TextPath, FFileHelper::EEncodingOptions::ForceUTF8, &IFileManager::Get(), EFileWrite::FILEWRITE_Append);

TextContent = TEXT("束缚于肉体中的你们，永远无法满足 ----吉尔伽美什 \n");

FFileHelper::SaveStringToFile(TextContent, *TextPath, FFileHelper::EEncodingOptions::ForceUTF8, &IFileManager::Get(), EFileWrite::FILEWRITE_Append);

支持导出CSV

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);

}

SaveStringArrayToFile

字符串数组写入文件，自动换行
如果保存中文乱码，点击高级保存为UTF8格式

Syntax

bool FFileHelper::SaveStringArrayToFile( const TArray<FString>& Lines, const TCHAR* Filename, EEncodingOptions EncodingOptions, IFileManager* FileManager, uint32 WriteFlags )

代码实现

FString TextPath = FPaths::ProjectDir() + TEXT("DataDrive/FateNight.txt");

TextPath = FPaths::ConvertRelativePathToFull(TextPath);

TArray<FString> TextLines;

TextLines.Add(TEXT("钢铁为身，而火焰为血。"));

TextLines.Add(TEXT("手制之剑已达千余，纵横无数战场而不败。"));

TextLines.Add(TEXT("不知生。"));

TextLines.Add(TEXT("亦不知死。"));

TextLines.Add(TEXT("未曾一次败退。"));

TextLines.Add(TEXT("常独自一人立于剑丘之巅独醉于胜利中。"));

TextLines.Add(TEXT("然而 留下的只有虚无。"));

TextLines.Add(TEXT("故此 此生已无意义。"));

TextLines.Add(TEXT("则此躯 注定为剑而生。"));

TextLines.Add(TEXT("故我祈求——无限之剑制(Unlimited Blade Works)"));

FFileHelper::SaveStringArrayToFile(TextLines, *TextPath,FFileHelper::EEncodingOptions::ForceUTF8);

巴特西

【UE4 C++】读写Text文件 FFileHelper

读取

FFileHelper::LoadFileToString

FFileHelper::LoadFileToStringArray

写入

SaveStringToFile

SaveStringArrayToFile

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