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Editorial Team
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Asked: 2026-05-22T03:02:50+00:00

This command in the Visual Studio 2010 Post-build event for %f in ($(ProjectDir)$(OutDir)*.dll) do

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This command in the Visual Studio 2010 Post-build event

for %f in ("$(ProjectDir)$(OutDir)*.dll") do echo %f

(echo will be replaced with some other tool) gives me the error

The command "[...]" exited with code 255.

I guess I have to escape the outermost round brackets but I don’t know how. I tried \( and ((.

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1 Answer

  1. Editorial Team

    You might need to use %%f instead of %f for the first one (and maybe the second one). In a batch file (which VS might use to implement these custom build steps), you have to use the extra % for identifiers.

    Edit: here’s the first part of the output from help for on the command line.

    Runs a specified command for each file in a set of files.

    FOR %variable IN (set) DO command [command-parameters]

    %variable Specifies a single letter replaceable parameter.
    (set) Specifies a set of one or more files. Wildcards may be used.
    command Specifies the command to carry out for each file.
    command-parameters
    Specifies parameters or switches for the specified command.

    To use the FOR command in a batch program, specify %%variable instead
    of %variable. Variable names are case sensitive, so %i is different
    from %I.

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