UEFMFileWatcher

Monitors a single file for changes. When the file is modified, the OnFileChanged delegate fires with the file path and change type.

Delegate

FOnFileChanged

DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FOnFileChanged, const FString&, FilePath, int32, ChangeType)

Parameter	Type	Description
FilePath	FString	Path to the changed file
ChangeType	int32	Type of change (see below)

Change Types

Value	Meaning
0	Unknown
1	Added
2	Modified
3	Removed

Functions

StartWatching

Callable Starts watching a file.

C++

bool StartWatching(const FString& FilePath)

Parameter	Type	Description
FilePath	FString	Full path to the file to watch

Returns: true if watching started successfully

Category: EFM|File Watcher

Blueprint Node

ƒStart Watching

File Path

Return Value

StopWatching

Callable Stops watching.

C++

void StopWatching()

Category: EFM|File Watcher

Blueprint Node

ƒStop Watching

IsWatching

Pure Checks if currently watching.

C++

bool IsWatching() const

Category: EFM|File Watcher

Blueprint Node

ƒIs Watching

Return Value

GetWatchedFilePath

Pure Gets the path of the watched file.

C++

FString GetWatchedFilePath() const

Category: EFM|File Watcher

Blueprint Node

ƒGet Watched File Path

Return Value

Properties

OnFileChanged

Assignable Event fired when the watched file changes.

UPROPERTY(BlueprintAssignable)
FOnFileChanged OnFileChanged

Example

// Create watcher
Watcher = Create UEFMFileWatcher

// Bind event
Watcher.OnFileChanged = OnFileChangedEvent

// Start watching
Watcher.StartWatching(GetGameSavedDirectory() + "config.ini")

// OnFileChangedEvent(FilePath, ChangeType):
//   if ChangeType == 2:  // Modified
//     ReloadConfig(FilePath)
//     Log("Config reloaded: " + FilePath)

// Later, stop watching
Watcher.StopWatching()