[Qt-interest] application version and DRY principle

[Konstantin Tokarev]

18.02.2011, 15:18, "Dmitry Teslenko" <dteslenko at gmail.com>:
> On Fri, Feb 18, 2011 at 14:50, Konrad Rosenbaum <konrad at silmor.de>; wrote:
>
>>  On Fri, February 18, 2011 12:20, Dmitry Teslenko wrote:
>>>  How to define application version once and use it everywhere:
>>>  a) in *.pro file to set custom package name like Program-<version>
>>  Have a look at the DEFINES variable of qmake (there is quite an extensive
>>  reference for qmake in the Qt docu).
>>>  b) in c++ sources to pass it to QApplication::setVersionNumber and
>>>  have about dialog with version number
>>  DEFINES get passed to the compiler, so you can put any kind of macro
>>  inside, for example
>>
>>  DEFINES += MYAPPVERSION="1.2.3 beta build 234"
>
> Did you use it for yourself or you just heard of defines?
>
> The way you suggest it me I'll get this makefile:
>
> DEFINES = -DMYAPPVERSION=1.2.3 beta build 234 -DSOMETHING_ELSE
>
> That's unusable makefile.
> If you add additional quotes like this:
>
> DEFINES += MYAPPVERSION="\"1.2.3 beta build 234\""
>
> You'll get right makefile. But you'll get  syntax error in source code
> because when you type something like this:
>
> QApplication::setApplicationVersion(MYAPPVERSION);
>
> Compliler will get:
>
> QApplication::setApplicationVersion(1.2.3 beta build 234);
>
> and will complain. And he would be right.

You should pass \\\"1.2.3 beta build 234\\\", it will pass escaped quoted string into the macro

-- 
Regards,
Konstantin