How to execute a cmd command using QProcess?

Question

I am attempting to execute a cmd command using

QProcess::startDetached("cmd /c net stop \"MyService\"");

This does not seem to stop the service. However, if I run it from start >> run, it works.

Try startDetached("cmd", QStringList() << "/c" << "net" << "stop" << "MyService"); and the same with << "\"MyService\"". For further debugging, don't use startDetached but start and connect to the QProcess instance's finished() and error() signals. — Frank Osterfeld
– Frank Osterfeld, Commented Feb 6, 2014 at 7:00
Here is what i tried QProcess::startDetached("cmd.exe ", QStringList() << " /c " << " net " << " stop " << " \"MyService\""); and it isnt working — MistyD
– MistyD, Commented Feb 6, 2014 at 7:42
@MistyD: Try it without all the extra spaces, just like Frank suggested. — Mike Seymour
– Mike Seymour, Commented Feb 6, 2014 at 8:01

TheDarkKnight · Accepted Answer · 2014-02-06 09:12:31Z

6

QProcess::startDetached will take the first parameter as the command to execute and the following parameters, delimited by a space, will be interpreted as separate arguments to the command.

Therefore, in this case: -

QProcess::startDetached("cmd /c net stop \"MyService\"");

The function sees cmd as the command and passes /c, net, stop and "MyService" as arguments to cmd. However, other than /c, the others are parsed separately and are not valid arguments.

What you need to do is use quotes around the "net stop \"MyService\" to pass it as a single argument, so that would give you: -

QProcess::startDetached("cmd /c \"net stop \"MyService\"\"");

Alternatively, using the string list you could use: -

QProcess::startDetached("cmd", QStringList() << "/c" << "net stop \"MyService\"");

answered Feb 6, 2014 at 9:12

TheDarkKnight

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2 Comments

Martin Hennings Over a year ago

The second example should read: QProcess::startDetached("cmd /c \"net stop \\\"MyService\\\"\""); (mind the extra escapes inside the parameter string)

lvr123 Over a year ago

Not working for me and not required. In a mkdir example, this is enough: proc.start("cmd /c mkdir \"c:/temp/foo bar9\""). See this question

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