CODEWITHSUNDEEP
visual-studiobatch-filevisual-studio-2017
mayaknife
mayaknife

Reputation: 302

Redirected output file remains open after devenv.exe returns

I have a .bat file with the following two commands:

"C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\Tools\..\IDE\devenv" plugin\proj1-vs15.sln /rebuild "Release" /project plugin\proj1-vs15.vcxproj /projectconfig "Release|x64"  1>vcbuild.log 2>&1

"C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\Tools\..\IDE\devenv" plugin\proj2-vs15.sln /rebuild "Release" /project plugin\proj2-vs15.vcxproj /projectconfig "Release|x64"  1>vcbuild.log 2>&1

The first command completes successfully but the second one immediately fails with the message "The process cannot access the file because it is being used by another process."

If I use a different filename for the redirected output in the second command then both commands complete without error.

I haven't had this problem with Visual Studio 2015 or any earlier versions, only with VS 2017.

Why is the redirected output file remaining open after the first devenv command has completed?

In my actual use-case having each execution of devenv.exe use a different filename for the redirected output would be inconvenient. Is there some way of ensuring that the output file is closed before the .bat file advances to the next command?

Upvotes: 0

Views: 277

Answers (1)

sst
sst

Reputation: 1463

Any child process that devenv spawns inherits the redirection handle, So if after debenv returns any of its child process is still open the file remains locked so CMD can not open vcbuild.log file the second time. The solution is to put both build commands in a redirected compound block.

(
    devenv <First Project Arguments>
    devenv <Second Project Arguments>
)>"vcbuild.log" 2>&1

Upvotes: 1

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