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Instanciating an ActiveX control into a C program

Posted on 2000-02-29
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Last Modified: 2014-08-19
Hello,

I am making a C program which should use an ActiveX control.

I have an ActiveX control and i know its CLSID, I want to use it so I do :

hr = CoInitializeEx ( NULL, COINIT_MULTITHREADED );

then

hr = CoCreateInstance ( &clsid,
            NULL,
            CLSCTX_INPROC_SERVER,
            &IID_IUnknown, //(REFIID) &giid,
            &ppv );

If I do so ... I have a link error LNK2001 telling me : unresolved external symbol IID_IUnknown

When I am using an ActiveX control is it a proper manner user IID_IUnknown as the REFIID, if not what should i use as the REFIID and how do I define it.


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Question by:mbensimo
2 Comments
 
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Accepted Solution

by:
jkr earned 100 total points
ID: 2570277
You'll have to link your application with 'uuid.lib' - this library holds the 'implementation' of this IID (see 'unknwn.h'). If you're using VC, adding

#pragma comment ( lib, "uuid.lib")

should do it...
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Expert Comment

by:harshvir_drish
ID: 40269940
Hi,

i want to call an activex control from my dll code but when i use the interface of activex control in my dll then it says
"undeclared identifier".
i know my dll code doesn't find the declaration of interface's pointer.
can you please tell me which header files or libraries i have to include so that i can get the pointer of my activex control.
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