Deactivate windows MessageBox dialog on exception

[Gregor Mückl]

On Wednesday, 28 August 2019 at 12:19:54 UTC, Andre Pany wrote:
> Hi,
>
> I call another process using function pipeShell and 
> Redirect.all.
>
> In case the child process(also D application) throws an 
> exception (str to int conversion exception), the child process 
> shows a message box on windows.
>
> I found the source code within DRuntime but I do not see a way 
> to hide this MessageBox.
>
> https://github.com/dlang/druntime/blob/25c8c1506183699758ca3bc323bb2a84a1d93f40/src/rt/dmain2.d#L644
>
> I would like to have the exception text available in stdout or 
> stderr of the pipe.
> Why the exception isn't just written to the pipe?
>
> (I do not want to implement a catch all in the source code of 
> the child process).
>
> The actual 2 D applications causing the dialog on windows: 
> https://forum.dlang.org/post/usfmuabytdoludeuldts@forum.dlang.org
>
> Kind regards
> Andre

The check in druntime could be changed to query the type of file 
handle that stdout/stderr point to. If they are a console or a 
file redirection, the error could be written there.

The following stack overflow question gives a possible test 
whether stdout/stderr exists: 
https://stackoverflow.com/questions/9021916/how-do-i-check-if-my-delphi-console-app-is-redirected-to-a-file-or-pipe

The documentation for GetStdHandle and GetFileType looks good, 
but I haven't tried it. I could probably write a quick proof of 
concept tonight.

An (IMO ugly) alternative would be to extend 
pipeShell/pipeProcess to launch the child process attached to a 
console on top of the redirects.

Gregor