FileAppend function failed

February 15th, 2018, 09:30 AM

Hi guys

If anyone had something like this or know what to do here please help me out.
Basically I made a copier of strategy orders from multiple windows using GlobalDictionary,
then once there are some changes in any of the strategies I write all the info from GlobalDictionary to a file. Usually this happens once in couple minutes, or once per hour, or once per 15 min.

The code is like this:

Code

FileDelete(Filepath);
FileAppend(Filepath, NewGDtoFile);

The 3rd party copies this file and then works with it (this happens once in 2 seconds). Once/twice per day I receive these errors:

Code

FileAppend function failed
Event: elsystem.SystemException Unable to create file: C:\Users ............

and it shuts down the strategy right away. Anyway to prevent this?

I tried to do something like this:

Code

For Value2 = 0 to 3
	Begin
		Try
			Begin								
				FileAppend(Filepath,NewGDtoFile);				
				Value2 = 3;
		    End;		
		Catch (elsystem.Exception ex)
			Begin						 
				Print(Numtostr(Value2,0)+" File Append Error +" + ex.ToString()+" MSG: "+ex.Message.ToString());				
			End;				
    	End;
    End;

but nothing works - still getting them
does anyone knows how to avoid these situations?

Thank You

February 15th, 2018, 02:41 PM

Hmm, the catch (elsystem.Exception ex) should work and send you the error message, it should not disable the strategy.
You should try in another directory, create a C:\test directory and create an empty file in it, and avoid the FileDelete.
It can be a lock on the file, maybe the Windows events viewer saw something.

February 16th, 2018, 04:35 AM

sam028

Hmm, the catch (elsystem.Exception ex) should work and send you the error message, it should not disable the strategy.
You should try in another directory, create a C:\test directory and create an empty file in it, and avoid the FileDelete.
It can be a lock on the file, maybe the Windows events viewer saw something.

in this directory it works fine couple of days then suddenly this happens and catch is not picking up the error, not sure why. There is no logic when it happens - either once a day or once in couple of days randomly.
I use FileDelete since I need to have only few lines there, every-time fresh, without that the file will become big in size.

Do you know a method to write to a file from fresh without deleting it?

February 16th, 2018, 05:52 AM

eronyx

...
Do you know a method to write to a file from fresh without deleting it?

No, there is no EL function for this. It's would be possible using a DLL (using DEFINEDLLFUNC) but it's overkill for this purpose.

February 16th, 2018, 06:29 AM

sam028

No, there is no EL function for this. It's would be possible using a DLL (using DEFINEDLLFUNC) but it's overkill for this purpose.

I am trying now the elsystem.io.StreamWriter function and it works without FileDelete - just not sure if I will have that error anymore, waiting for it to see if will crash

do you know any other way to catch all exceptions?

thx for your help

FileAppend function failed

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FileAppend function failed