Error: unable to load phidget21.dll

[ChristerG]

We have an application that uses phidgets for a voting system at a museum. The systems has been used for almost 10 years.
I have now installed this app on a new computer running Windows 10 Pro, but when I start the application I get the error:
Unable to load DLL 'phidget21.dll': the specific module could not be found.

ph1.PNG (13.07 KiB) Viewed 13791 times

The connected phidget is showing in the control panel:

ph3.PNG (60.36 KiB) Viewed 13791 times

and the phidget21.dll file seem to be installed:

ph2.PNG

(117.95 KiB) Not downloaded yet

Any help in fixing this issue would be much appreciated.

[Patrick]

Try copying phidget21.dll and phidget21.net.dll into the same folder as your program - make sure you choose the right phidget21.dll (x86 or x64) depending on if your program is 32-bit or 64-bit.

I'm not sure why it isn't picking up on the installed library.

-Patrick

[ChristerG]

Hi Patrick

I tried your suggestion but with no success, I'm still getting the same error. The error message appears and has to be closed three times when the app is started. The app opens briefly and then closes. Do you have any other suggestions that I can try?
Don't know if it's of any importance, but the computer I'm using has an AMD Ryzen processor.
I've also done the exact same installation on another computer, and on this machine the app works.

[Patrick]

Open you program in Dependency Walker and see if there are any missing dependencies: http://www.dependencywalker.com/

It's odd that it's failing, but the control panel works fine. Could be a 32-bit issue.

-Patrick

[mcfet]

we are running into same issue on Windows 10 pro. with 21 we get the missing DLL.
now I run a dependency checker on and I find that MSVCR100.DLL could not be resolved in windows/syswow64/phidget21.dll

stranger is the behavior of Phidget22Manager as it detects NO PHIDGETS