ActiveX DLL Functions

Jeff Barnes · Post by **Jeff Barnes** » Thu Aug 09, 2007 1:02 pm

Hi Everybody,

I have an ActiveX DLL that I need to call functions from.

I have not tried any ActiveX before and do not know where to start.

Can someone give me some pointers as to how to call functions inside an ActiveX DLL.

Thanks,

Post by **Antonio Linares** » Thu Aug 09, 2007 1:24 pm

Jeff,

Please make a search for TActiveX in these forums.

There are many examples

Post by **Antonio Linares** » Thu Aug 09, 2007 1:27 pm

Jeff Barnes · Post by **Jeff Barnes** » Thu Aug 09, 2007 6:21 pm

Antonio,

I've been looking at the different posts but I can not see how I tell my program that I want to use MyFile.DLL.

It looks like once I get that figured out I would be using commands like:

oActiveX:DO("MyFunction")

Is that correct?

Jeff Barnes · Post by **Jeff Barnes** » Thu Aug 09, 2007 6:31 pm

I guess step one is:

hPOX := LoadLibrary("\DLL\MyFile.DLL")

But how do I setup the oActiveX object?

Post by **Antonio Linares** » Thu Aug 09, 2007 7:50 pm

Jeff,

The first step is to know the PROGID (is a string) of the ActiveX that you are going to use.

i.e. for Microsoft Excell the progid is "OWC11.Spreadsheet"

Whats the activex that you are going to use ?

Jeff Barnes · Post by **Jeff Barnes** » Thu Aug 09, 2007 8:21 pm

it is a 3rd party ActiveX that is used to control a medical device.

Any idea on how I would find the PROGID.

I looked at the DLL file with OleView (via the ITypeLib Viewer) but I can not see anything that looks like the ID.

Post by **Antonio Linares** » Thu Aug 09, 2007 8:43 pm

Jeff,

Don't you have access to that ActiveX docs ?

You can also use its GUID instead of its PROGID ( http://en.wikipedia.org/wiki/Globally_Unique_Identifier ) which usually looks as a long sequence of numbers separated by "-" and between "{" and "}"

Have you tried to instantiate the ActiveX from VB and review its properties ?

Thu Aug 09, 2007 9:28 pm

Try this:

828B8942-5924-4BD3-963D-20786181A6A4

EMG

Jeff Barnes · Post by **Jeff Barnes** » Thu Aug 09, 2007 10:49 pm

When I try to do:

oPulseOX = TActiveX():New( oMainWnd, "{828B8942-5924-4BD3-963D-20786181A6A4}" )

I get an empty white box in the upper left corner and the windows error:

EzSat.exe has encountered a problem and needs to close. We are sorry for the inconvenience.

Is there something I need to link into my app?

Thanks,

Post by **Antonio Linares** » Thu Aug 09, 2007 11:52 pm

Jeff,

Do you get an error.log file ?

Jeff Barnes · Post by **Jeff Barnes** » Fri Aug 10, 2007 12:11 am

Sorry, no error.log file is generated.

Post by **Antonio Linares** » Fri Aug 10, 2007 12:31 am

Jeff,

Have you tried that ActiveX with Visual Basic ?

Jeff Barnes · Post by **Jeff Barnes** » Fri Aug 10, 2007 1:05 am

Antonio,

I have no way to test with Vb.

James Bott · Post by **James Bott** » Fri Aug 10, 2007 1:11 am

Jeff,

I am no ActiveX expert, but if I remember correctly ActiveX components have to be registered in the registry. You might do a Google on it.

James