"defined" variable

[thomasp]

Hi there!

To begin I'm sorry for the spam, I already posted that question in the french forum but (I must be blind) I didn't realized I should have written here.

So :

I'm coding in C++, and I'd like to know if there is a variable i could use in a "#ifdef" preprocessor directive, which would indicate me at compilation time if a space navigator has been installed on the computer.

something like this :

Code: Select all

#ifdef 3DCONNEXION_INSTALLED

//... compile interface code

#endif

Thanks !

Thomas

[jwick]

A compilation time switch would be quite limiting, unless you compile your program before every use.
OTOH, you can check at run-time if the driver is running.

[thomasp]

thank you for your answer


As a matter of fact, I used the Cube3DPolling code to plug my space navigator in my application. But when I tried to compile my project on a computer without 3dconnexion drivers installed, the compiler failed on the line (stdafx.h) :

Code: Select all

#import "progid:TDxInput.Device.1" no_namespace

I think this error is primarily relative to ATL stuff (and indirectly 3dconnexion)
This is why I want to know (at compilation time) if the compilation has a chance to work... or not.

Maybe I should look after an ATL defined variable ?...

[jwick]

That "#import" is looking for a registered type library. No driver installed, no type library gets registered.

The libary is TDxInput.dll.

You can:

1) Copy TDxInput.dll localiy
2) Build the code once on a system where the driver is installed and copy the resulting .tlh file

Number 2 works but it isn't recommended.

Number 1 requires you to change the #import to point the file (just like an ordinary #include).

See:
viewtopic.php?p=10945#10945
viewtopic.php?p=2966#2966
viewtopic.php?p=11751#11751

[thomasp]

Thank you it works now