# Joystick functions

**URL:** <https://psychtoolbox.discourse.group/t/joystick-functions/1758>\
**Category:** Uncategorized\
**Created:** [June 3, 2002, 9:11am UTC](https://psychtoolbox.discourse.group/t/joystick-functions/1758 "2002-06-03T09:11:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![arrigolinux](https://avatars.discourse-cdn.com/v4/letter/a/d07c76/32.png) [@arrigolinux](https://psychtoolbox.discourse.group/u/arrigolinux)\
**Post date:** [June 3, 2002, 9:11am UTC](https://psychtoolbox.discourse.group/t/joystick-functions/1758/1 "2002-06-03T09:11:19Z")

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Hi Denis could you help me to find out what's wrong with my joystick functions?Everytimes I use them, this is the output that&nbsp;I receive:

Unable to load mex file: C:\MATLAB6p1\psychtoolbox\psychjoystick\Joystick.dll.  
The specified module could not be found.

&nbsp;

??? Invalid MEX-file

&nbsp;

Error in ==\> C:\MATLAB6p1\psychtoolbox\psychdemos\joystickdemo\JoystickDemo.m  
On line 61&nbsp; ==\> NumberJoysticks = JOYSTICK('GetNumJoysticks');  

Thanks in advance for your help.

Best regards

Roberto

> > - ---- Original Message ----- 
> > 
> > **From:** [Denis Pelli](mailto:denis.pelli@... "denis.pelli@...")
> > 
> > **To:** [Rhea Eskew](mailto:ESKEW@... "ESKEW@...") ; [psychtoolbox](mailto:psychtoolbox@yahoogroups.com "psychtoolbox@yahoogroups.com") 
> > 
> > **Sent:** Monday, June 03, 2002 10:48 AM
> > 
> > **Subject:** [psychtoolbox] yet another ScreenTest.m
> > 
> >   
> > 
> > dear rhea and doug  
> >   
> > yet another draft. I'm also including two files I forgot to include   
> > before, DescribeComputer.m and DescribeScreen.m, which belong in   
> > PsychOneLiners.  
> >   
> > best  
> >   
> > denis  
> >   
> > At 2:51 AM -0400 6/3/02, Denis Pelli wrote:  
> > \>dear rhea and doug  
> > \>  
> > \>i've further polished the code. Here's the latest. (Discard what I   
> > \>sent before.)  
> > \>  
> > \>best  
> > \>  
> > \>denis  
> > \>  
> > \>p.s. i can't send email to doug from home because his institute   
> > \>(smith-kettlewell) has blacklisted all email from verizon.net, which   
> > \>is my ISP.  
> > \>  
> > \>At 2:38 AM -0400 6/3/02, Denis Pelli wrote:  
> > \>\>dear rhea & doug  
> > \>\>  
> > \>\>i've greatly enhanced ScreenTest and i'd like to see how it works   
> > \>\>in characterizing troublesome cases like the ATI DualHead and the   
> > \>\>NVidia.  
> > \>\>  
> > \>\>just dump the enclosed files into your PsychTests folder, replacing   
> > \>\>older versions.  
> > \>\>  
> > \>\>would you mind trying ScreenTest and sending me the report?  
> > \>\>  
> > \>\>best  
> > \>\>  
> > \>\>denis  
> > \>\>  
> > \>\>ps.  
> > \>\>this report supercedes the old ScreenTest; i don't need that report   
> > \>\>if i get this one.  
> > \>\>  
> > \>\>this requires a relatively new version of screen.mex, which you   
> > \>\>both have. others can get it from recent forum messages, e.g. 1018.  
> > \>   
> > [http://psychtoolbox.org](http://psychtoolbox.org)  
> > POST a message to: psychtoolbox@yahoogroups.com  
> > UNSUBSCRIBE by sending a blank message to:   
> > psychtoolbox-unsubscribe@yahoogroups.com   
> >   
> > Your use of Yahoo! Groups is subject to the [Yahoo! Terms of Service](http://docs.yahoo.com/info/terms/).