UE5文件操作

       首先在虚幻引擎中创建UMyBlueprintFunctionLibrary类，可以在该类中写我们重复利用的功能，并且这些功能不依赖于特定的游戏对象，方便全局调用。

1.文件的读取和写入

	UFUNCTION(BlueprintCallable, Category = "File")
	static bool loadStringFromFile(FString filePath, FString& resultString);
	UFUNCTION(BlueprintCallable, Category = "File")
	static bool writeStringToFile(TArray<FString> saveFile, FString filePath);

bool UMyBlueprintFunctionLibrary::loadStringFromFile(FString filePath, FString& resultString)
{
	if (!filePath.IsEmpty())
	{
		if (FFileHelper::LoadFileToString(resultString, *filePath))
		{
			return true;
		}
		else
		{
			//error
		}
	}
	return false;
}

bool UMyBlueprintFunctionLibrary::writeStringToFile(TArray<FString> saveFile, FString filePath)
{
	if (!filePath.IsEmpty())
	{
		if (FFileHelper::SaveStringArrayToFile(saveFile, *filePath))
		{
			return true;
		}
		else
		{
			//error
		}
	}
	return false;
}

2.获取文件名、后缀名、文件名

	UFUNCTION(BlueprintCallable, Category = "File")
	static FString GetFilePath(FString path);
	UFUNCTION(BlueprintCallable, Category = "File")
	static FString GetFileName(FString InPath,bool bRemovePath);
	UFUNCTION(BlueprintCallable, Category = "File")
	static FString GetFileExtension(FString InPath, bool bInCludeDot);

FString UMyBlueprintFunctionLibrary::GetFilePath(FString path)
{
	FString result;
	result = FPaths::GetPath(*path);
	return result;
}

FString UMyBlueprintFunctionLibrary::GetFileName(FString InPath, bool bRemovePath)
{
	return FPaths::GetBaseFilename(*InPath,bRemovePath);
}

FString UMyBlueprintFunctionLibrary::GetFileExtension(FString InPath, bool bInCludeDot)
{
	return FPaths::GetExtension(*InPath,bInCludeDot);
}

3.创建文件夹和删除文件夹

	UFUNCTION(BlueprintCallable, Category = "File")
	static void CreateFolder(FString FolderName);
	UFUNCTION(BlueprintCallable, Category = "File")
	static void DeleteFolder(FString FolderName);

  在cpp中引入FileManagerGeneric.h

#include "Runtime/Core/Public/HAL/FileManagerGeneric.h"

void UMyBlueprintFunctionLibrary::CreateFolder(FString FolderName)
{
	//FString path = FPaths::ProjectContentDir();
	FPlatformFileManager::Get().GetPlatformFile().CreateDirectoryTree(*FolderName);
}

void UMyBlueprintFunctionLibrary::DeleteFolder(FString FolderName)
{
	//FString path = FPaths::ProjectContentDir();
	FPlatformFileManager::Get().GetPlatformFile().DeleteDirectoryRecursively(*FolderName);
}

4.文件的移动和查找

	UFUNCTION(BlueprintCallable, Category = "File")
	static bool MoveFileTo(FString To, FString From);
	UFUNCTION(BlueprintCallable, Category = "File")
	static TArray<FString> FindFileFolder(FString Path, FString Filter, bool Files, bool Directory);

bool UMyBlueprintFunctionLibrary::MoveFileTo(FString To, FString From)
{
	return IFileManager::Get().Move(*To,*From);
}

TArray<FString> UMyBlueprintFunctionLibrary::FindFileFolder(FString Path, FString Filter, bool Files, bool Directory)
{
	TArray<FString> FilePathList;
	FilePathList.Empty();
	FFileManagerGeneric::Get().FindFilesRecursive(FilePathList, *Path, *Filter, Files, Directory);
	return FilePathList;
}

5.全部代码

h文件部分：

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "Kismet/BlueprintFunctionLibrary.h"
#include "MyBlueprintFunctionLibrary.generated.h"

/**
 * 
 */
UCLASS()
class STUDYCODEPROJECT_API UMyBlueprintFunctionLibrary : public UBlueprintFunctionLibrary
{
	GENERATED_BODY()
public:
	UFUNCTION(BlueprintCallable, Category = "File")
	static bool loadStringFromFile(FString filePath, FString& resultString);
	UFUNCTION(BlueprintCallable, Category = "File")
	static bool writeStringToFile(TArray<FString> saveFile, FString filePath);
	UFUNCTION(BlueprintCallable, Category = "File")
	static FString GetFilePath(FString path);
	UFUNCTION(BlueprintCallable, Category = "File")
	static FString GetFileName(FString InPath,bool bRemovePath);
	UFUNCTION(BlueprintCallable, Category = "File")
	static FString GetFileExtension(FString InPath, bool bInCludeDot);
	UFUNCTION(BlueprintCallable, Category = "File")
	static void CreateFolder(FString FolderName);
	UFUNCTION(BlueprintCallable, Category = "File")
	static void DeleteFolder(FString FolderName);
	UFUNCTION(BlueprintCallable, Category = "File")
	static bool MoveFileTo(FString To, FString From);
	UFUNCTION(BlueprintCallable, Category = "File")
	static TArray<FString> FindFileFolder(FString Path, FString Filter, bool Files, bool Directory);
};

cpp文件部分：

// Fill out your copyright notice in the Description page of Project Settings.


#include "MyBlueprintFunctionLibrary.h"
#include "Runtime/Core/Public/HAL/FileManagerGeneric.h"

bool UMyBlueprintFunctionLibrary::loadStringFromFile(FString filePath, FString& resultString)
{
	if (!filePath.IsEmpty())
	{
		if (FFileHelper::LoadFileToString(resultString, *filePath))
		{
			return true;
		}
		else
		{
			//error
		}
	}
	return false;
}

bool UMyBlueprintFunctionLibrary::writeStringToFile(TArray<FString> saveFile, FString filePath)
{
	if (!filePath.IsEmpty())
	{
		if (FFileHelper::SaveStringArrayToFile(saveFile, *filePath))
		{
			return true;
		}
		else
		{
			//error
		}
	}
	return false;
}

FString UMyBlueprintFunctionLibrary::GetFilePath(FString path)
{
	FString result;
	result = FPaths::GetPath(*path);
	return result;
}

FString UMyBlueprintFunctionLibrary::GetFileName(FString InPath, bool bRemovePath)
{
	return FPaths::GetBaseFilename(*InPath,bRemovePath);
}

FString UMyBlueprintFunctionLibrary::GetFileExtension(FString InPath, bool bInCludeDot)
{
	return FPaths::GetExtension(*InPath,bInCludeDot);
}

void UMyBlueprintFunctionLibrary::CreateFolder(FString FolderName)
{
	//FString path = FPaths::ProjectContentDir();
	FPlatformFileManager::Get().GetPlatformFile().CreateDirectoryTree(*FolderName);
}

void UMyBlueprintFunctionLibrary::DeleteFolder(FString FolderName)
{
	//FString path = FPaths::ProjectContentDir();
	FPlatformFileManager::Get().GetPlatformFile().DeleteDirectoryRecursively(*FolderName);
}

bool UMyBlueprintFunctionLibrary::MoveFileTo(FString To, FString From)
{
	return IFileManager::Get().Move(*To,*From);
}

TArray<FString> UMyBlueprintFunctionLibrary::FindFileFolder(FString Path, FString Filter, bool Files, bool Directory)
{
	TArray<FString> FilePathList;
	FilePathList.Empty();
	FFileManagerGeneric::Get().FindFilesRecursive(FilePathList, *Path, *Filter, Files, Directory);
	return FilePathList;
}