How to Get .Net dll's ClassId on VC++6 before CoCreateInstance ?

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Maverick - 15 Jul 2004 04:46 GMT

In VC++, I have to hardcoded the .net dll's ClassId if i want to create the com instance. How can i get the .net COM's classID without having to create the instance first ?

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#import "Sample.tlb"
using namespace Sample;

//******NOTE******
const IID CLSID_SampleObj = {0x5B85B3EB,0x899B,0x440f, {0xBF,0x0A,0x67,0x43,0x0B,0x7A,0x17,0x1F}};

int main(int argc, char* argv[])
{
HRESULT hr;
CoInitialize(NULL);

CComPtr<SampleObj> Obj = NULL;
hr = Obj.CoCreateInstance(CLSID_SampleObj, NULL, CLSCTX_ALL);

string tooLateToGetClsidHere = Obj->GetCLSID();
}

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Phil Wilson - 16 Jul 2004 15:49 GMT

This is a confusing question - the entire COM client-server model is based
on the client knowing the clsid before calling the COM server (or knowing a
ProgId, which amounts to the same thing). How could you *not* know the clsid
of your object? Would a ProgId solve your problem? That import will generate
a header file that will have some Guids in it - is that what you're looking
for?

Signature

Phil Wilson
[MVP Windows Installer]

> In VC++, I have to hardcoded the .net dll's ClassId if i want to create the com instance. How can i get the .net COM's classID without having to

create the instance first ?

> ---------------------------------------
> #import "Sample.tlb"
[quoted text clipped - 15 lines]
>
> ------------------------------------------------------------------------------

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Maverick - 20 Jul 2004 05:09 GMT

thx... in fact, i was so stupid. There's no need to have the CLSID when doing CoCreateInstance of a .Net COM in VC++6 application. All i need to do is the following :

#import "C:\\MyCOMObj.tlb"
using namespace MyCOMObj;

int main()
{
HRESULT hr;
CoInitialize(NULL);

CComPtr<CSampleObj> obj = NULL;
hr = obj.CoCreateInstance(__uuidof(CSampleObj));
}

> This is a confusing question - the entire COM client-server model is based
> on the client knowing the clsid before calling the COM server (or knowing a
[quoted text clipped - 27 lines]
> > --------------------------------------------------------------------------
> ----

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Naveen K Kohli - 19 Jul 2004 19:06 GMT

You can always CLSID from ProgId using ProgIDFromCLSID API.

Naveen
http://www.netomatix.com

> In VC++, I have to hardcoded the .net dll's ClassId if i want to create the com instance. How can i get the .net COM's classID without having to

create the instance first ?

> ---------------------------------------
> #import "Sample.tlb"
[quoted text clipped - 15 lines]
>
> ------------------------------------------------------------------------------

Reply to this Message

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How to Get .Net dll's ClassId on VC++6 before CoCreateInstance ?

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