CreateInstance() Fails…

[d00ape]

I’ve got a .dll from my supplier that I am trying to create a instance of. (I’m not realy good att dll’s).

How may I search for errors when my call to: CreateInstance(…) fails

I know it would return a HRESULT and that the value is 1 on those cpu-s which it don’t work on. The call work properly on my developing machine.

I surely have registered the dll on those cpu-s the call fails.

Pleased for any suggestions…


APe

 

[Cagliostro]

try to do in console at the first a
regsvr32 yourdll.dll


Ion Filipski

 

[d00ape]

I've done that.

Eaven:
regsvr32 -u mydll.dll

and then:
regsvr32 mydll.dll



APe

 

[Cagliostro]

any changes?

Ion Filipski

 

[B00gyeMan]

Please supply the full call context (at least CreateInstance and its parameters).

 

[Cagliostro]

I can't understanmd where do you call CreateInstance and it fails? I don't know your context. CreateInstance is a callback method and you never call it directly...

Ion Filipski

 

[B00gyeMan]

CreateInstance is a COM/DCOM/COM+ specific call. Are you sure you're doing the right thing? If it is about COM, post your message here

http://www.tek-tips.com/threadminder.cfm?spid=195.

If else, are you sure you did not mean LoadLibrary ?!

If you really meant CreateInstance, why don't you try using CoCreateInstance and wrap it up in a CComPtr or in a CComQIPtr ?

Again, please provide the parameters

 

[Cagliostro]

CreateInstance is a member of IClassFactory. You never call this method directly. The standard method to create an instance is CoCreateIsntance, which result more calls, one of them is IClassFactory::CreateInstance. I think before I would past a half of MSDN here, you should open MSDN by yourself and maybe some manuals.

Ion Filipski

 

[B00gyeMan]

CreateInstance is not only a member of IClassFactory, but of IObjectContext, ITransactionContextEx and so forth and so on (don't remember all of them and today I am too lazy to search on the net).

I still wait for more details from d00ape

 

[Cagliostro]

Anyway, I think d00ape try to call this method directly in some way, without doing it by using COM API, or something like that...

Ion Filipski

 

[d00ape]

Hi again. Been away for illness.
Heres my code:


#import "MultiUseDataBase.dll"
...

CoInitialize(NULL);

// Create intstance to component
if( hres = m_IPtr.CreateInstance("MultiUseDataBase.MultiUseDataBase") == S_OK)
{
// ALL OK
}
else
{
// This happens on stuggling CPUs
}

 

[Cagliostro]

More correctly is to do like this:
if(SUCCEEDED(m_IPtr.CreateInstance
("MultiUseDataBase.MultiUseDataBase"))
{
//is ok
}else
{
//is not ok
}

Is quite the same, but more correctly.
Maybe your dll tries to load anothe dll that is missing or it has some specific requirements?


Ion Filipski

 

[d00ape]

Ion wrote:
--------
Maybe your dll tries to load anothe dll that is missing or it has some specific requirements?
--------

I now think thats the problem. I've got a new version of the dll from ny suppiler and run:

regsvr32 TheDll.dll

Do I have to remove the old dll from the registry or something first?

 

[Cagliostro]

maybe, but is enouigh you only to create the instance of only a several version, look in registry for

MultiUseDataBase.MultiUseDataBase
and maybe there are many versions
MultiUseDataBase.MultiUseDataBase.1
MultiUseDataBase.MultiUseDataBase.2
...


Ion Filipski