[Lazarus] Reading from an external process

Sven Barth pascaldragon at googlemail.com
Tue Nov 5 16:32:55 CET 2013

Am 05.11.2013 14:48, schrieb Richard Mace:
> Hi All,
> I have got the following code from the wiki for creating and reading 
> from an external process. Effectively, I want to capture all of the 
> output from the process "handle.exe", into a StringList so that I can 
> read it to make sure that everything went OK, however, when I run the 
> following code, I am getting a "RunError(103) on the line: WriteLn('-- 
> Going to run: ' + OurCommand);
> Any ideas what I'm doing wrong please?
Is your application (that one which calls handle.exe) compiled as a GUI 
application or not? (check in the project settings) If it is compiled as 
a GUI application then disable the option and recompile. An additional 
console window should now appear when you run the application from 
within Lazarus in which you'll see your output.
Reason: on Windows the I/O is closed on startup if the application is 
compiled as a GUI program (Delphi compatible)
Alternatively you could use a Memo. Either you directly use 
YourMemo.Add('...') or if you want to keep using Writeln, I have a unit 
sent somewhere on the mailing list some days ago that allows you to 
assign a memo or edit to a TextFile so that you could use either 
Writeln(YourFile, '...') or you could override "Output" so that you 
could keep using Writeln('...').

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