Re: Calling a cygwin binary from CreateProcess - problem with redirection

[Igor Peshansky <pechtcha at cs dot nyu dot edu>]

On Sat, 30 Dec 2006, Ciarán Ó Duibhín wrote:

> Hi,
>
> I have no experience with cygwin, but I downloaded a Windows .exe which
> is a unix program compiled for Windows with cygwin.  Several cygwin
> dll's are included.
>
> I can run this program from the DOS command line.
> An example command line is:
> c:\progra~1\freeli~1.4\analyzer -f data\config\en.cfg < c:\split.txt >
> new.txt
>
> But I would like to launch it from another Windows application - a
> graphic interface I am writing for it, in fact.  However, when I supply
> the above command line to the Windows CreateProcess function as the
> lpCommandLine parameter, I get the error message
> "CONFIG_OPTIONS: Error -11 parsing command line.
>    unknown option '' at position 4 in command line"
> ie. the redirection symbol <.  It doesn't matter whether or not there is
> a space after the redirection symbol.
>
> This is the same error message as produced when a commandline parameter
> which is genuinely in error is supplied to the program, so it seems that
> the combination of CreateProcess and cygwin is passing the redirection
> parameter to the program in some mutated form, whereas it arrives
> correctly from the command line.

Ciarán,

CreateProcess() is not a shell -- it will pass all arguments (including
your redirection specifiers) to the program.  This is not a
Cygwin-specific problem -- you would have gotten the same errors with a
pure Windows executable.

You might want to read up on the arguments to CreateProcess on MSDN
(especially the input/output handles in the STARTUPINFO structure).  If
you have further questions, a Windows-specific list might be a better
venue.
HTH,
	Igor
-- 
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