StacTrace

[Dave Craggs 7]

How do you get a StackTrace when an exception occurs?

 

I have implement a logger inheriting from TDUnitXNullLogger

 

Got this in OnTestError

 

procedure TJPANUllLogger.OnTestError(const threadId: TThreadID;
  const Error: ITestError);
begin
  inherited;
  FCurrentTestItem.Error := True;
  FCurrentTestItem.StackTrace := Error.StackTrace;
  Codesite.SendFmtMsg('StackTrace %s',[Error.StackTrace]);
  Codesite.SendFmtMsg('Message %s',[Error.ExceptionMessage]);
  Codesite.SendFmtMsg('LocationInfo %s',[Error.ExceptionLocationInfo]);
  Codesite.SendFmtMsg('AddressInfo %s',[Error.ExceptionAddressInfo]);
end; 

ExceptionMessage is coming through, but not StackTrace

[Der schöne Günther 336]

The StackTrace property is just a placeholder, it is always empty. There is no built-in way to get the stacktrace. Hard to believe, but here is what the official documentation says:

 

System.SysUtils.Exception.StackTrace - RAD Studio API Documentation (embarcadero.com)

Quote

By default, StackTrace is always an empty string. 

(...)

In order to use the StackTrace property to obtain the stack trace for exceptions, you have to use (or implement) a stack trace provider. There are a number of third-party solutions, both commercial and free.

Some of the stack trace providers are:

• JEDI Code Library (the JclDebug and the JCLHoohExcept unit).
• EurekaLog
• madExcept

For more information on how to use some of the above third-party stack trace providers, see the following blog posts:

(...)

A few years ago, I used the Jedi Code library. After that, I completely removed the JCL from our products and since then, I am just using the "FastMM_FullDebugMode.dll" which exports a few handy methods that will give you the stack trace as a string list.

Edited January 25, 2023 by Der schöne Günther

[Lars Fosdal 1866]

Or, you invest in EurekaLog or MADExcept.

[aehimself 404]

There are also open-source alternatives:

 

https://github.com/MahdiSafsafi/DebugEngine

https://github.com/Fr0sT-Brutal/Delphi_StackTraces

 

I never used JCL as I only wanted stack traces and I had to import half of the library just to achieve that.

[Dave Craggs 7]

I have been using MadExcept for years. So how do I plug it into DunitX? 

[Dave Craggs 7]

Hmm - there is a unit DUnitX.StackTrace.MadExcept5;

 

 

 

[Dave Craggs 7]

Think I am losing it. Was also discussed here - no resolution though.

 

 

[Dave Craggs 7]

OK got it working. Needed to include 

{$I DUnitX.Stacktrace.inc}

 

Needed to be edited to enable MadExcept5

 

Also needed to add DUnitX.StackTrace.MadExcept5 to the project.