EFMAsync

Async file operations with delegate callbacks. All functions run on background threads and do not block the game thread.

Delegates

FOnFileReadComplete

DECLARE_DYNAMIC_DELEGATE_TwoParams(FOnFileReadComplete, bool, bSuccess, const TArray<uint8>&, Data)

FOnFileWriteComplete

DECLARE_DYNAMIC_DELEGATE_TwoParams(FOnFileWriteComplete, bool, bSuccess, const FString&, FilePath)

FOnFileCopyComplete

DECLARE_DYNAMIC_DELEGATE_ThreeParams(FOnFileCopyComplete, bool, bSuccess, const FString&, Source, const FString&, Destination)

FOnFileStringReadComplete

DECLARE_DYNAMIC_DELEGATE_TwoParams(FOnFileStringReadComplete, bool, bSuccess, const FString&, Content)

Functions

AsyncReadFile

Callable Reads a file asynchronously as bytes.

C++

void AsyncReadFile(UObject* WorldContextObject, const FString& FilePath, FOnFileReadComplete OnComplete)

Parameter	Type	Description
WorldContextObject	UObject*	World context (auto-filled in Blueprints)
FilePath	FString	Full path to the file
OnComplete	FOnFileReadComplete	Callback with success and byte data

Category: EFM|Async

Blueprint Node

ƒAsync Read File

File Path

On Complete

AsyncReadFileAsString

Callable Reads a file asynchronously as a string.

C++

void AsyncReadFileAsString(UObject* WorldContextObject, const FString& FilePath, FOnFileStringReadComplete OnComplete)

Parameter	Type	Description
WorldContextObject	UObject*	World context (auto-filled in Blueprints)
FilePath	FString	Full path to the file
OnComplete	FOnFileStringReadComplete	Callback with success and string content

Category: EFM|Async

Blueprint Node

ƒAsync Read File As String

File Path

On Complete

AsyncWriteFile

Callable Writes bytes to a file asynchronously.

C++

void AsyncWriteFile(UObject* WorldContextObject, const FString& FilePath, const TArray<uint8>& Data, FOnFileWriteComplete OnComplete)

Parameter	Type	Description
WorldContextObject	UObject*	World context (auto-filled in Blueprints)
FilePath	FString	Full path to the file
Data	TArray<uint8>	Bytes to write
OnComplete	FOnFileWriteComplete	Callback with success and written file path

Category: EFM|Async

Blueprint Node

ƒAsync Write File

File Path

Data

On Complete

AsyncWriteString

Callable Writes a string to a file asynchronously.

C++

void AsyncWriteString(UObject* WorldContextObject, const FString& FilePath, const FString& Content, FOnFileWriteComplete OnComplete)

Parameter	Type	Description
WorldContextObject	UObject*	World context (auto-filled in Blueprints)
FilePath	FString	Full path to the file
Content	FString	Text content to write
OnComplete	FOnFileWriteComplete	Callback with success and written file path

Category: EFM|Async

Blueprint Node

ƒAsync Write String

File Path

Content

On Complete

AsyncCopyFile

Callable Copies a file asynchronously.

C++

void AsyncCopyFile(UObject* WorldContextObject, const FString& Source, const FString& Destination, FOnFileCopyComplete OnComplete)

Parameter	Type	Description
WorldContextObject	UObject*	World context (auto-filled in Blueprints)
Source	FString	Path to the source file
Destination	FString	Path to the destination file
OnComplete	FOnFileCopyComplete	Callback with success, source and destination paths

Category: EFM|Async

Blueprint Node

ƒAsync Copy File

Source

Destination

On Complete

AsyncMoveFile

Callable Moves a file asynchronously.

C++

void AsyncMoveFile(UObject* WorldContextObject, const FString& Source, const FString& Destination, FOnFileCopyComplete OnComplete)

Parameter	Type	Description
WorldContextObject	UObject*	World context (auto-filled in Blueprints)
Source	FString	Path to the source file
Destination	FString	Path to the destination file
OnComplete	FOnFileCopyComplete	Callback with success, source and destination paths

Category: EFM|Async

Blueprint Node

ƒAsync Move File

Source

Destination

On Complete

Example

// Async read
AsyncReadFileAsString(Self, FilePath, OnComplete)
  OnComplete(bSuccess, Content):
    if bSuccess:
      ProcessContent(Content)
    else:
      LogError("Failed to read file")

// Async write
AsyncWriteString(Self, FilePath, "Hello World", OnComplete)
  OnComplete(bSuccess, WrittenPath):
    if bSuccess:
      Log("Written to: " + WrittenPath)