Getting error from Navision

Lio · 2004-12-30

Hello.

I have some problem.
I connecting with Navision using sockets and I run some codeunit, which insert some data. If this codeunit cause an error i want to catch this error im my application. How I can get this error in nav?

Is there some function like GetLastError or something like this?

This error can't be shown in navision. How i can do this ?

I know how send it to/from navision.

Thanks

kine · 2005-01-03

see this topic:

http://www.mibuso.com/forum/viewtopic.php?t=2343&highlight=catch+error

Lio · 2005-01-05

Thanks.

This is shame that in product like Navision there isn't a possibility to catch an error...

janpieter · 2005-01-05

Indeed it is ...

DenSter · 2005-01-05

Well there is a kind of a workaround for this, but you have to experiment a little with it. A codeunit has a return value that you can evaluate. If there is an error inside the codeunit, it will return FALSE, if everything is alright, it returns TRUE.

So if you do this:

IF NOT MyCodeunit.RUN THEN
  MESSAGE('I found an error!!');

Your code will execute without aborting anything, even though MyCodeunit raises an error. The trick becomes how you want to catch the actual error. I've done something like this:

In one codeunit (called MyCodeunit):

MyText := 'Error during posting date validation';
MySalesHeader.VALIDATE("Posting Date",'error'); //this will raise an error, since 'error' is not a date

You also need a function to get the value of MyText:

GetErrorText(VAR parText : Text[30])
parText := MyText;

Then you can call this codeunit from another codeunit inside an IF statement:

IF NOT MyCodeunit.RUN THEN BEGIN
  MyCodeunit.GetErrorText(locTextVariable);
  MESSAGE(locTextVariable);
END;

And this will run fine without errors, even if MyCodeunit errors out.

You can get pretty fancy with this, just play around with it. The real pity is that if a record variable causes an error, Navision destroys it, so you can't catch the value straight from the record variable, you need to anticipate the error. Let me know if you need more help on this.

Lio · 2005-01-07

I know this way but...

I insert into navision Sales Headers and Sales Line from other application and I can't evaluate every field! There is to much possible errors.

There should be a function GetLastError. Micro$oft probably intentionally don't implemented it

See ya.

DenSter · 2005-01-07

There should, but there isn't :whistle:

Remember that Microsoft did not create this product, Navision did. When they did, they put the emphasis on the functionality (creating a great ERP system) instead of cool development features. Of course we can debate whether error catching is a cool feature or a necessity, but the quality of the IDE was not the number 1 priority.

janpieter · 2005-01-07

I think they just want to disencourage programmers to make their own programs that can call C/ALL coding form external applications so they can sell more NAS licenses ... :evil:

ara3n · 2005-01-08

1 NAS license comes free with 3.70. So it's not selling NAS licenses that they didn't create getlasterror functionality.

pdj · 2005-01-09

The userportal uses the NAS and is able to show a web-user the error that happended in Navision. I don't know how it is made, but then there must be a way. One method could be reading the last event the the eventlog from the NAS...

jreynolds · 2005-01-10

Navision comes with several timer DLL's: CGTimer, CPTimer, and NTimer. If you declare an automation variable using NTimer and set the WithEvent property to TRUE then two triggers are created: Timer and TimerError. The Timer trigger fires with a frequency established through several properties (Interval and Enabled) and the TimerError fires when ever an error occurs during the running of the Timer trigger. The good part is that TimerError is passed a 1024 character string containing the text of the error message that would be displayed in a GUI environment. I have used this with NAS to automate various processes (such as posting) and have been able to trap specific error messages and log them to a table that the users can examine.

Lio · 2005-01-13

jreynolds wrote:

Navision comes with several timer DLL's: CGTimer, CPTimer, and NTimer. If you declare an automation variable using NTimer and set the WithEvent property to TRUE then two triggers are created: Timer and TimerError. The Timer trigger fires with a frequency established through several properties (Interval and Enabled) and the TimerError fires when ever an error occurs during the running of the Timer trigger. The good part is that TimerError is passed a 1024 character string containing the text of the error message that would be displayed in a GUI environment. I have used this with NAS to automate various processes (such as posting) and have been able to trap specific error messages and log them to a table that the users can examine.

Yeah!! This is great, but it cause another problem

I can catch error message in TimerError trigger, but this error is first display in Navision. I know, I can use:

IF Table.Insert THEN...

but in this case TimerError doesn't catch this message!

What can I do ?
I want catch message only in TimeError and don't show it in Navision...

jreynolds · 2005-01-13

Lio wrote:

[What can I do ?
I want catch message only in TimeError and don't show it in Navision...

I have only used this with NAS where there is no GUI and so this is not an issue. I don't know if there is a way to suppress the error message in Navision, but I would guess that there is not.

janpieter · 2005-01-13

You could, you would have to build a VB or C++ Application. I have seen in Spy++ that comes with .Net that you can just search for the message window and read text from the following message types:

- error
- message
- runmodal
- confirm

too bad; this does not work for a dialog screen.

Then you can automate a button click to remove the message.

Hope i will have some time to work on this, it shouldn't be that difficult if youre familiar with API programming.

pduck · 2005-01-14

i realized this for c/front with delphi ... if an error box comes up the programm reads its label and then sends a close-event to the message box ... if somebody is interested i can send him the code so you mustn't fight with the windows handles like i did

janpieter · 2005-01-17

Yeah, i think i'm interested in that. Saves me some time ... If you and your company doesn't mind sharing it \:D/

pduck · 2005-01-17

That's it ...

EnumWinProc runs through all Window-Handles and will be fired by a Timer-Component every 10 seconds.

First you must get your own Process ID ... because C/Front is embedded as an OCX in my Application the C/Front message has the same PID as my Application.

The WindowClassName of Windows created by Navision is always #32770, the hell knows why

The Window Text of the C/Front Messages is always an empty String, so after checking the PID, the WindowClass and the Window Text i am sure that the current handle is the C/Front Message Window Handle.

Then I try to get the handle of the Text Control inside the Message Box. I tested it with the Program WinspectorSpy and the Label ID was always $FFFF.

At least you must send a Get-Message to the Window to get the Label's text. After that I send a Close-Event to close the Message Window and kill the line breaks in the Message Text.

function EnumWinProc(Wnd: HWnd): boolean; stdcall;
var myProcessID, ProcessID       : longint;
    LabelHandle : HWnd;
    TXTbuffer : array[0..255] of Char;
begin
  Result := TRUE;
  GetWindowThreadProcessID(Application.Handle,@myProcessID);
  GetWindowThreadProcessID(wnd,@ProcessID);
  if ProcessID = myProcessID then begin
    GetClassName(Wnd, TXTbuffer, 255);
    if TXTbuffer = '#32770' then begin
      GetWindowText(Wnd, TXTbuffer, 255);
      if TXTbuffer = '' then begin
        LabelHandle := GetDlgItem(Wnd, $FFFF);
        SendMessage(LabelHandle, WM_GETTEXT, sizeof(TXTbuffer), Integer(@TXTbuffer));
        if CloseErrors then
          SendMessage(Wnd, WM_SYSCOMMAND, SC_CLOSE, 0);
        LastErrorDialog := StringReplace(String(TXTBuffer),#10,'',[rfReplaceAll, rfIgnoreCase]);
        LastErrorDialog := StringReplace(String(LastErrorDialog),#13,'',[rfReplaceAll, rfIgnoreCase]);
      end;
    end;
  end;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
EnumWindows(@EnumWinProc, 0);
end;

janpieter · 2005-01-17

hmmm, interesting. Thanks pduck.

I will try to use this system with automation and not C/Front, but i think the principles will be the same.

Maybe then we could create a C/AL error procedure which fires instead of a message popping up.

I used Spy++ to look up these parameters, but there is no way to distinguish a message from an error is there?

anyway many thanks O:)

kine · 2005-01-17

What about bitmap ID or something??? (each dialog have another icon...)

Lio · 2005-01-18

Thanks to all !

I used jreynolds way. It's great and it's work.

I can catch all errors and show it in my application. I must change some chars to my encoding but it is easy

Thanks again.

ldreamsl · 2005-05-24

jreynolds wrote:

Navision comes with several timer DLL's: CGTimer, CPTimer, and NTimer. If you declare an automation variable using NTimer and set the WithEvent property to TRUE then two triggers are created: Timer and TimerError. The Timer trigger fires with a frequency established through several properties (Interval and Enabled) and the TimerError fires when ever an error occurs during the running of the Timer trigger. The good part is that TimerError is passed a 1024 character string containing the text of the error message that would be displayed in a GUI environment. I have used this with NAS to automate various processes (such as posting) and have been able to trap specific error messages and log them to a table that the users can examine.

I have try this procedure, but the Errore message PopUp, and the Trigger TimerError don't show the message.

Why???

kine · 2005-05-25

The error popup is problem if you are using Navision Timer in Navision client. If you use it in Navision Application Server, this is no problem because there are no popups... :-) And the OnError is running ok on client too, but you can not use the statement "if codeunit.run then..." - in this case, no OnError is called...

naso · 2005-05-25

For catching errors when running NAS see the documentation for the Communication Component wich is also a dll that comes standard with the Navision product CD

ldreamsl · 2005-05-25

I do not use NAS, this is the problem, and wanted to have an instrument that it captured the errors, so as "OnError Resume Next" of the "Visual Basic".

With the procedure of "pduck", I succeed to close the window of PopUP, but the Crach of the Application (Report,CodeUnit,...,..) already has happened.

Do Not exist the way to capture the errors, and manage all from program and to manage all from program.

Visual Basic Version of "pduck" Procedute

Public Function EnumWindowProc(ByVal hwnd As Long, ByVal lParam As Long) As Long

--Dim nSize As Long
--Dim sTitle As String
--Dim sClass As String
--Dim sIDType As String
--Dim TextBuff As String

--If GetParent(hwnd) <> 0& And IsWindowVisible(hwnd) Then
----sTitle = GetWindowIdentification(hwnd, sIDType, sClass)
----If sClass = "#32770" Then

GetWindowText hwnd, TextBuff, 255
If TextBuff = "" Then
SendMessage hwnd, WM_SYSCOMMAND, SC_CLOSE, NILL
End If
----End If
--End If
--EnumWindowProc = True
End Function

kine · 2005-05-26

If you mean to be able to catch error and continue the process to catch all errors, it is not possible, because error is situation, when application do not know what to do... :-) how can you continue for example, if you have variable.get to some value which does not exists and you assume that it exists (because you have no if around the .GET)? 8)

janpieter · 2005-05-26

I couldn't think of any way to build in an

"on error resume next"

Into C/AL. Seems impossible to me. I don't think you want this kind of behavior in a database program.

The error sink however is possible if you extend your code and add an event and rais the event when the error is catched.

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