Root > Reference > All Classes > TThreadEx > Properties > TThreadEx.AutoHandleException

Property TThreadEx.AutoHandleException

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Allows you to enable automatic thread's exception handling.

 

Unit

EBase

 

Value

True - automatically invoke EurekaLog for exceptions in thread. False (default) - do not alter standard behaviour; store thread exception in FatalException property; you must analyze this exception manually.

 

Remarks

By default this property is set to False. This means that TThreadEx class will behave in the same way as TThread class - it will store thread's fatal exception into FatalException property, which must be analyzed by caller thread. For example:

Code (Delphi)

// Create thread

Thread := TMyThread.Create('Thread Name');

try

 

// Wait for thread's completion.

// This wait can be implemented in any other way.

// E.g. you can assign OnTerminate handler;

// or you can PostMessage from thread to main thread.

Thread.WaitFor;

 

// Analyze thread completion.

// Re-raise any thread error in current thread.

// You should do this only after the thread has finished.

E := Thread.FatalException;

if Assigned(E) then

begin

// clear FatalException property

PPointer(@Thread.FatalException)^ := nil;

raise E;

end;

 

finally

FreeAndNil(Thread);

end;

 

or:

 

Code (Delphi)

type

TForm1 = class(TForm)

...

private

procedure HandleExceptionInThread(Sender: TObject);

end;

 

procedure TForm1.Button1Click(Sender: TObject);

var

Thread: TThreadEx;

begin

Thread := TThreadEx.Create(True);

Thread.OnTerminate := Self.HandleExceptionInThread;

Thread.FreeOnTerminate := True;

Thread.Start;

Thread := nil; // never access thread var with FreeOnTerminate after Start

end;

 

procedure TForm1.HandleExceptionInThread(Sender: TObject);

var

Thread: TThread;

begin

Thread := (Sender as TThread);

if Assigned(Thread.FatalException) then

HandleException(Thread.FatalException);

end;

 

 

 

When AutoHandleException property is set to True - EurekaLog will call HandleException function automatically for thread's fatal exceptions.

 

Code (Delphi)

procedure TForm1.Button1Click(Sender: TObject);

var

Thread: TThreadEx;

begin

Thread := TThreadEx.Create(True);

Thread.AutoHandleException := True;

Thread.FreeOnTerminate := True;

Thread.Start;

Thread := nil; // never access thread var with FreeOnTerminate after Start

end;

 

Please note that even when AutoHandleException is True - FatalException property will still be filled with exception.

 

See also

SetEurekaLogStateInThread Function
NameThread Function



Send feedback... Build date: 2018-11-26
Last edited: 2018-11-26
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