COM Discussion Boards

Re: IZoneIdentifier interface?

dandy7219-Nov-04 7:33

dandy72

19-Nov-04 7:33

Well...I got slightly farther. Now I'm really gonna show my lack of COM experience. Smile | :)

This is what I currently have, slightly tweaked from some old sample. So far, this is just a simple console application:

#include <windows.h>
#include <tchar.h>
#include <urlmon.h>

int main( void )
{
HRESULT h = CoInitialize( NULL );
if( (S_OK != h) && (S_FALSE != h) )
return -1;

IZoneIdentifier* pZI = NULL;

h = CoCreateInstance(
CLSID_PersistentZoneIdentifier,
NULL,
CLSCTX_INPROC_SERVER,
IID_IZoneIdentifier,
(LPVOID*)&pZI );
if( FAILED( h ) )
return -1;

[...]

CoUninitialize();
return 0;
}

The code compiles fine, however the linker is complaining it can't find _CLSID_PersistentZoneIdentifier and _IID_IZoneIdentifier.

The updated Platform SDK's urlmon.h defines the CLSID as:

EXTERN_C const IID CLSID_PersistentZoneIdentifier;

That's the only reference I can find on my entire hard drive. The variable is declared as extern, but not defined elsewhere...likewise, _IID_IZoneIdentifier is defined in the same file as:

EXTERN_C const IID IID_IZoneIdentifier;

Where am I supposed to find those definitions?

Re: IZoneIdentifier interface?

geo_m23-Nov-04 0:47

geo_m

23-Nov-04 0:47

Sorry for delay, but I wasn't notified by the CP, because you replied to your reply, hence I fond it by pure coincidence Blush | :O

)

Anyway I would expect, that from what you described, there's some .lib file required to be added to the project. I don't have the newest SDK (and as until end of week I can connect only through GPRS, I'll not have it soon) I can't tell you which one it should be, but I suspect that Urlmon.lib should do the work.

Re: IZoneIdentifier interface?

dandy7223-Nov-04 7:20

dandy72

23-Nov-04 7:20

Thanks for following up.

I already tried linking to urlmon.lib to no avail. Lots of "unresolved externals" messages re: CLSIDs being posted on Google's Usenet archive suggest to #define INITGUID, #include <initguid.h>, add uuid.lib to the project, etc. None of these help.

I'm quickly running out of ideas...

Re: IZoneIdentifier interface?

geo_m23-Nov-04 22:52

geo_m

23-Nov-04 22:52

I'm just downloading the new SDK, I hope I will be able to help you later today evening.

Re: IZoneIdentifier interface?

geo_m24-Nov-04 1:42

geo_m

24-Nov-04 1:42

aghrr, once more, today's CP problems vanished my effort in writing the final response Frown | :(

Anyway, managed it to compile! Hooray!
I hadn't too much time for that research, but I found following:
In new updated urlmon.h the IZoneIdentifier uses the macro MIDL_INTERFACE that allows to use the brand new special microsoft __uuidof.

Problem remains with the CLSID_PersistentZoneIdentifier. Although his fellows CLSID_InternetSecurityManager and CLSID_InternetZoneManager are known and will compile, this one is obviously missing.

As I don't have too much time for the research, I just hotfixed it by adding the definition of the CLSID_PersistentZoneIdentifier by hand, before the main function in your example:

static const GUID CLSID_PersistentZoneIdentifier = 
{ 0x0968E258, 0x16C7, 0x4DBA, { 0xAA, 0x86, 0x46, 0x2D, 0xD6, 0x1E, 0x31, 0xA3 } };

and the final result is then:

h = CoCreateInstance( 
           CLSID_PersistentZoneIdentifier,
	   NULL,
	   CLSCTX_INPROC_SERVER,
	   __uuidof(IZoneIdentifier),
	  (LPVOID*)&pZI 
                   );

Compiles and also creates some object in return.

Hope that helps.

Re: IZoneIdentifier interface?

dandy7225-Nov-04 5:11

dandy72

25-Nov-04 5:11

geo_m, you're my new hero. Smile | :)

I thought about manually adding the definition myself, but I wasn't too sure about how to proceed (again, my COM experience is limited). May I ask how you came up with that GUID?

I'll give this a shot. Thanks a million!

Re: IZoneIdentifier interface?

geo_m26-Nov-04 3:11

geo_m

26-Nov-04 3:11

Hi,

glad that it helped. To get any GUID already registered in the system you can use the OLE/COM object view utility. This utility is a part of the VS.NET distribution and can be found also in the tools in SDK.
Here you can list all registered interfaces, objects and typelibs, with a bit of patience you can find here whatever needed Blush | :O

)

Re: IZoneIdentifier interface?

dandy7226-Nov-04 5:36

dandy72

26-Nov-04 5:36

> with a bit of patience you can find here whatever needed

I had everything but not that. Smile | :)

The OLE/COM object viewer really needs a search function...

How to return a vector or an array?

tpndtbk18-Nov-04 2:59

tpndtbk

18-Nov-04 2:59

Hello all,
I'm now wrting an IDL file for COM. if I want to return a vector of string, what can I do?
The method that I want is following in c++
vector<string> Function();
As far as I know, a string can be BSTR in IDL, so what in IDL corresponds to a vector or an array in C++?
Thank you very much!

Re: How to return a vector or an array?

User 21559718-Nov-04 18:46

User 215597

18-Nov-04 18:46

Try SAFEARRAY.
But I think it is not recognized by MIDL compiler. Let me know if you find some other way of using arrays in IDL that MIDL recognizes.

Have a great day ahead!
Regards,
Sohail Kadiwala
(My Blog - http://blogs.wdevs.com/sohail/[^])

modified 21-Apr-21 21:01pm.

Re: How to return a vector or an array?

Steve S18-Nov-04 23:23

Steve S

18-Nov-04 23:23

SAFEARRAY(BSTR) should be recognised and understood perfectly well by MIDL. I've worked on projects that made heavy use of these things, and stuff like SAFEARRAYs of user defined types

Steve S
Developer for hire

Re: How to return a vector or an array?

User 21559718-Nov-04 23:39

User 215597

18-Nov-04 23:39

Hi Steve,
the MIDL compiler doesn't understand SAFEARRAY (I read it in some article). Can you lead me to some good resource/URL where more on this is shown?

Have a great day ahead!
Regards,
Sohail Kadiwala
(My Blog - http://blogs.wdevs.com/sohail/[^])

modified 21-Apr-21 21:01pm.

Re: How to return a vector or an array?

Steve S19-Nov-04 0:14

Steve S

19-Nov-04 0:14

Good resource would be "Essential IDL" written by Martin Gudgin, or "Essential COM" by Don Box.

If you write

HRESULT getList([out]SAFEARRAY(BSTR)*ppsa);

in your IDL for the interface method, in your C++ you have

STDMETHOD(getList)(SAFEARRAY**ppsa);

as a definition, and

STDMETHODIMP class::getList(SAFEARRAY**ppsa)
{
...
}
as your implementation. In IDL, the array type is known (and can be a simple type, like 'long' or 'DATE', or even a user defined type (structure)).

One issue is that if you're using the MIDL that came with VC++6, you might want to upgrade by downloading the Platform SDK.

In your implementation, you need to create a SAFEARRAY, and fill in the pointer properly. There must be loads of code out there, google for "SAFEARRAY IDL SOURCE" or look here[^] for some examples of more complicated stuff...

Steve S
Developer for hire

Re: How to return a vector or an array?

Akshay Dave19-Nov-04 0:13

Akshay Dave

19-Nov-04 0:13

Hi Steve, I am in very much need of Safearray related concepts and methodologies and its use in MIDL file.because I need much use of it too pass large values from COM Dll to VB in meterological projects and M/c related projects.Plz send me some codes and some URL where I can get get proper conceptual knowledge of SAFEARRAY with code.I'm currently facing difficulty in Passing SAFEARRAY from ATL/COM DLL to VB in an Event.So please help me.I am a memeber of this group by name Akshay Dave.My mail id is avd9683@rediffmail.com,
akshayd@eqqu.com.
Awaiting eagerly 4 ur reply.

Akshay Dave

Akshay Dave

Re: How to return a vector or an array?

User 21559719-Nov-04 1:21

User 215597

19-Nov-04 1:21

Hi Akshay,
Did u check the link Steve has given?
http://www.mvps.org/vcfaq/com/4.htm[^]

Its got some good neat stuff on it. Also Check on MSDN for SAFEARRAY.

Have a great day ahead!
Regards,
Sohail Kadiwala
(My Blog - http://blogs.wdevs.com/sohail/[^])

modified 21-Apr-21 21:01pm.

Re: How to return a vector or an array?

Steve S19-Nov-04 8:40

Steve S

19-Nov-04 8:40

You need to read either (or both) Essential IDL and Essential COM, or at a minimum, look for examples on MSDN and other sites (like this one) which use SAFEARRAYs. Google for SAFEARRAY SAMPLE or SAFEARRAY SOURCE which should help you get started.

Alternatively, my rates for training (if you're UK based) are quite competitive Smile | :)

Steve S
Developer for hire

WORD

Stgt16-Nov-04 22:59

Stgt

16-Nov-04 22:59

hi I would like to remote control Word. As I can insert a new tabellenzeile thank you

BROTHER!

Jörgen Sigvardsson17-Nov-04 11:37

Jörgen Sigvardsson

17-Nov-04 11:37

I know, that was childish of me. Roll eyes | :rolleyes:

This is a good starting point[^]

--
Weiter, weiter, ins verderben.
Wir müssen leben bis wir sterben.

I blog too now[^]

Re: BROTHER!

Anonymous17-Nov-04 21:05

Anonymous

17-Nov-04 21:05

hi
unfortunately I find there also nothing in addition
thanks Smile | :)

Re: WORD

Steve S18-Nov-04 23:26

Steve S

18-Nov-04 23:26

(Isn't this a FAQ?)

To do this, you need to understand what parts you want to control, and know about the object model for Word. The easiest way is to record a VBA macro that does what you want, and examine it to see how it works. Often you will be able to 'optimise' the equivalent C++ code, although converting is sometimes tricky. To get you started there used to be a VBA -> C++ "conversion" tool on the MS web site (look for BTOC, I think)

Steve S
Developer for hire

Re: WORD

Anonymous19-Nov-04 0:49

Anonymous

19-Nov-04 0:49

hi steve thank you for your answer

what is this "C++ "conversion" tool on the MS web site (look for BTOC, I think)
i know it on VB, but i will it in VC++
i have no idea Frown | :-(

Re: WORD

Steve S19-Nov-04 1:07

Steve S

19-Nov-04 1:07

Go to MSDN and enter 216388 in the search page. Should give 3 hits, top one B2CSE.EXE is what you want.

Steve S
Developer for hire

Re: WORD

Anonymous19-Nov-04 1:54

Anonymous

19-Nov-04 1:54

ah, thank you very much

Urgent!!!How to pass an array in Event in ATL/COM DLL

Akshay Dave16-Nov-04 18:36

Akshay Dave

16-Nov-04 18:36

I want to pass array of double in an Event using Atl/Com so that the complete array must be visible in VB through that event.Awaiting for response as soon as possible.

Akhsay Dave

Making MFC Doc/view COM EXE

Ro_land15-Nov-04 19:25

Ro_land

15-Nov-04 19:25

Hi !
Is it possible to take an existing MFC application and to manually add code such, that the application becomes a COM exe server ?
I found something about such a "supported addition" --> "How to Add ATL Support to an MFC EXE" http://support.microsoft.com/default.aspx?scid=kb;EN-US;175190 but it doesn't seem to work. I think that that example does't deal with COM EXE but just with plain COM.
Can anybody shed a light on this subject ?

Thanks
Roland Rubichi

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