| Description |
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The OnError method is called when the Error event is triggered.
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| | Notes | The author was unable to get the OnError method invoked in the sample code. Am awaiting a response from Borland to help on this matter.
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| Microsoft MSDN Links |
System.IO
System.IO.FileSystemWatcher
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| A simple example |
program Project1;
{$APPTYPE CONSOLE}
uses
System.IO;
// Class definition code
type
MyWatcherClass = Class(System.IO.FileSystemWatcher)
published
procedure OnError (Events : ErrorEventArgs);
end;
var
MyWatcher : MyWatcherClass;
procedure MyWatcherClass.OnError(Events: ErrorEventArgs);
begin
// It is crucial that the inherited OnError method is called
inherited OnError(Events);
// Indicate that we have detected a file or folder error
Console.WriteLine(Events.ToString);
end;
// Main code
begin
// Create an object inherited from the FileSystemWatcher class
MyWatcher := MyWatcherClass.Create('C:\');
// Watch for any file error
MyWatcher.NotifyFilter := NotifyFilters.LastAccess;
// Now we wait until an event occurs -
// MyWatcher will notify us of changes
MyWatcher.WaitForChanged(WatcherChangeTypes.Changed);
Console.Readline;
end.
| | Show full unit code | It was expected that when incurring a file system error that the OnError method should be called, but this was not the case.
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