can't find Ni845x.dll

[sjborley]

I'm tring to use the USB-8451 from C++ (or C#).    I've installed the latest driver NI-845x v2.0 on my PC running Windows-7 64-bit.  This KnowledgeBase article on 'How To Access USB-845x API Functions from a C Program' states I can find the Ni845x.dll in the C:\Windows\System32 folder in Windows. I've looked, but it's not there.

Where is this dll?  Was it installed someother place or does v2.0 not include the dll?

The readme for the NI-845x driver says it supports 'Microsoft Visual C/C++ 6.0 (or newer)' and 'Windows 7 (32-bit and 64-bit)'.

Is it possible to access the USB-8451 from C without a dll?

[Oli.P · Accepted solution]

Hi Sjborley,

I'm Oli from NI UK.  Thanks for your query.

On some systems (Windows 7 x64 for example) you will find the DLL C:\Windows\SysWOW64\ folder.

In response to your second question, you will require the DLL to access the USB-8451.

I hope that answers your questions.

Kind Regards,

[sjborley]

Thanks, OLi. It was were you said it would be.

Pity the KnowlegeBase article is not up to date, and that the ReadMe.htm does not mention this alternative location.  But I guess that's what this forum is for.

[Oli.P]

Hi Sjborley,

No problem at all!  Glad to help.

Thanks for mentioning the KB. I'm in the process of bringing it up to date now.

Kind Regards,

[shady1]

hello Oli,

I have similar error message, however the difference is that I am able to locate the NI845x.dll but I get another message as I proceed, I get this error message, 

"the program can not start because NiSpy Log.dll is missing from your computer, try re installing the program to fix this problem"

thanks

Shady