COM Discussion Boards

#realJSOP13-Oct-01 4:41

13-Oct-01 4:41

I want to be able to generate a CLSID, but I always want the first 4 sections (best case) to be the same like so:

51eb18c0-98a7-11d1-83d1-f46705c10000
51eb18c0-98a7-11d1-83d1-f46705c10001
51eb18c0-98a7-11d1-83d1-f46705c10002
51eb18c0-98a7-11d1-83d1-f46705c10003

I need this to happen regardless of the machine's on a network or not. The first four sections should be different for each machine the program is run on as well.

Is this possible?

To hell with those thin-skinned pillow-biters. - Me, 10/03/2001

Re: CLSID's

13-Oct-01 14:14

John you are a moron. That would defeat the purpose of a GUID. You want it to be a "GLOBLE UNIQUE IDENTIFYER" if MS allowed what you want then there would be a bunch of COM components with the same GUID.

Re: CLSID's

#realJSOP13-Oct-01 14:35

#realJSOP

13-Oct-01 14:35

Anonymous? Despite your obvious "know-it-all" status (I should have seen the great big DICK in the middle of your forehead before asking the question), you haven't got a freakin clue as to why I'm even ASKING this kind of question.

Do you even know the answer? Hmmm, I thought not.

Besides all of that, if you're too chickenshit to use your real name, I don't have any more time to spend on your worthless fecal-brained ass.

To hell with those thin-skinned pillow-biters. - Me, 10/03/2001

Re: CLSID's

#realJSOP13-Oct-01 14:56

#realJSOP

13-Oct-01 14:56

Bite me.

To hell with those thin-skinned pillow-biters. - Me, 10/03/2001

Re: CLSID's

#realJSOP13-Oct-01 15:42

#realJSOP

13-Oct-01 15:42

So, you delete your posts so that any late-comers won't know you're an a**hole. Funny thing is, you can't delete a post that was done anonymously. Well, for every's informationm, the drivel that this post is in response to was posted by one Roger Smith.

To hell with those thin-skinned pillow-biters. - Me, 10/03/2001

Re: CLSID's

Not Active14-Oct-01 6:31

Not Active

14-Oct-01 6:31

You could try creating them yourself

<br />
GUID BaseGuid;<br />
CoCreateGuid(&BaseGuid);<br />
<br />
GUID MySecondGuid;<br />
MySecondGuid.Data1 = BaseGuid.Data1;<br />
MySecondGuid.Data2 = BaseGuid.Data2;<br />
MySecondGuid.Data3 = BaseGuid.Data3;<br />
<br />
MySecondGuid.Data4 = Whatever you want<br />

Re: CLSID's

#realJSOP14-Oct-01 7:01

#realJSOP

14-Oct-01 7:01

I need the whole thing to be generated programatically (by the windows api). I think I found the answer, but I need a new version of the platform SDK to get the function prototype.

To hell with those thin-skinned pillow-biters. - Me, 10/03/2001

Re: CLSID's

Not Active14-Oct-01 9:10

Not Active

14-Oct-01 9:10

What function are you using, or thinking of using? It might come in handy for something I've been considering.

Re: CLSID's

#realJSOP14-Oct-01 10:29

#realJSOP

14-Oct-01 10:29

In Win2K, use UuidCreateSequential to get sequential guids.

In Win9x, using UuidCreate will do the same thing (I think).

To hell with those thin-skinned pillow-biters. - Me, 10/03/2001

Re: CLSID's

#realJSOP15-Oct-01 5:09

#realJSOP

15-Oct-01 5:09

You need to have at least the February 20001 release of the SDK to get the correct code. My SDK at home is too early of a version.

To hell with those thin-skinned pillow-biters. - Me, 10/03/2001

Re: CLSID's

Aaron Schaefer15-Oct-01 9:53

Aaron Schaefer

15-Oct-01 9:53

Hi John,

You can create consecutive GUID's with the UuidGen utility. Use the -nXXX command line switch. According to the MSDN documentation, you can create sequential guid's programmatically by creating a single GUID (with CoCreateGuid), and then incrementing the FIRST word of each subsequent GUID. So, I don't think you want to increment the last word of the GUID as shown, since this may result in non-unique GUID's; it appears that the first word of the set is the one that is generated from the time on the machine, not the last one. This should satisfy that the GUID's are unique across machines as well, since you aren't messing with the part that contains the MAC address of the machine.

// MSDN Documentation, search for "GUID Creation and Optimizations"
For example, if you were to type

uuidgen -n5 -s >guids.txt

the uuidgen utility would generate a block of UUIDs similar to the following:

{12340001-4980-1920-6788-123456789012}
{12340002-4980-1920-6788-123456789012}
{12340003-4980-1920-6788-123456789012}
{12340004-4980-1920-6788-123456789012}
{12340005-4980-1920-6788-123456789012}

One method for generating and tracking GUIDs for an entire project begins with generating a block of some arbitrarily large number of UUIDs—say, 500. For example, if you were to type

uuidgen -n500 -s >guids.txt

the utility would generate 500 consecutive UUIDs and write them to the specified text file. You could then check this file into your source tree, providing a single repository for all GUIDs to be used in a project. As people require GUIDs for their portions of the project, they can check out the file, take however many GUIDs they need, marking them as taken and leaving a note about where in the code or "spec" they are using them.

Re: CLSID's

Tim Smith15-Oct-01 10:34

Tim Smith

15-Oct-01 10:34

Those wouldn't be UUIDs (a.k.a. CLSID, GUID, IID).

http://www.webdav.org/specs/draft-leach-uuids-guids-01.txt

Tim Smith
Descartes Systems Sciences, Inc.

Re: CLSID's

#realJSOP16-Oct-01 2:58

#realJSOP

16-Oct-01 2:58

I bookmarked that page - good read.

To hell with those thin-skinned pillow-biters. - Me, 10/03/2001

Netmeeting 3 -- help!

aniel12-Oct-01 13:17

aniel

12-Oct-01 13:17

I am working on a project that will recieve netmeeting calls. Upon connection it will open an audiostream, and then watch the state of the INmChannelAudio object. More precisely, the INmChannelAudio object is supposed to provide an automatic callback to the INmChannelAudioNotify class, which I have written according to the samples provided by microsoft. However, for some reason it never calls back that function. Also, when I manually try to check the state of the INmChannelAudio object via the calls GetState and IsIncoming, GetState returns NM_AUDIO_TRANSFERRING once the audio object has become active, unless it has been set to pause, in which case it returns NM_AUDIO_PAUSED. IsIncoming() always returns S_FALSE, even when there is audible data coming from the speakers.

So I am led o a couple of assumptions -- Either my code to check the state is wrong, or I am connected to the object wrong. I'm almost certain my code to check the state is correct, since it changes. I am not sure about IsIncoming though, because it always returns S_FALSE. the code I have been using is

HRESULT hr;
NM_AUDIO_STATE puState;
PUSER pUser = (PUSER) PUserLocal();
INmChannelAudio * pChannel = pUser->m_pChannelAudio;
pChannel->GetState(&puState);
hr = pChannel->IsIncoming();

However, no matter what, this code doesn't really matter. I am using it to debug. My main problem is the class CAudNotify which is the INmChannelAudioNotify class. As I said before, the INmChannelAudio class, which is predefined, is supposed to call back to my CAudNotify class once they are connected. Since it does not, I assume my connect code is flawed. Here is that code:

//Class declaration
class CAudNotify : public RefCount, public CNotify, public INmChannelAudioNotify
{
public:
CAudNotify();
~CAudNotify();

// INmChannelAudioNotify
HRESULT STDMETHODCALLTYPE NmUI(CONFN uNotify);
HRESULT STDMETHODCALLTYPE MemberChanged(NM_MEMBER_NOTIFY uNotify, INmMember * pMember);
HRESULT STDMETHODCALLTYPE StateChanged(NM_AUDIO_STATE uState);
HRESULT STDMETHODCALLTYPE PropertyChanged(DWORD dwReserved);

// ICNotify methods
HRESULT STDMETHODCALLTYPE Connect (IUnknown *pUnk);
HRESULT STDMETHODCALLTYPE Disconnect(void);

// IUnknown methods
ULONG STDMETHODCALLTYPE AddRef(void);
ULONG STDMETHODCALLTYPE Release(void);
HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, PVOID *ppvObj);
};

//and class code

HRESULT HookAudio(INmChannel * pChannel)
{
HRESULT hr;
CAudNotify * pNotify;
ASSERT(NULL != pChannel);
if(NULL != g_pChannelAudio)
{
g_pChannelAudio->Release();
MessageBox(NULL,"HookAudio: replacing existing g_pChannelAudio","call",MB_OK);
}
if(NULL != g_pChannelAudio)
{
g_pNotifyAud->Disconnect();
g_pNotifyAud->Release();
}
hr = pChannel->QueryInterface(IID_INmChannelAudio, (void **)&g_pChannelAudio);
if (FAILED(hr))
{
MessageBox(NULL,"HookAudio: Unable to get Audio channel","call",MB_OK);
return hr;
}

pNotify = new CAudNotify();
if(NULL == pNotify)
{
hr = E_OUTOFMEMORY;
}
else
{
hr = pNotify->Connect(g_pChannelAudio);
if(FAILED(hr))
{
MessageBox(NULL,"CAudNotify Failed" ,"call",MB_OK);
pNotify->Release();
}
else
{
MessageBox(NULL,"Audio Connection point established successfully" ,"call",MB_OK);
g_pNotifyAud = pNotify;
}
}
if(FAILED(hr))
{
MessageBox(NULL,"Audio Connection point failed" ,"call",MB_OK);
g_pChannelAudio->Release();
g_pChannelAudio = NULL;
}
return hr;
}

HRESULT STDMETHODCALLTYPE CAudNotify::QueryInterface(REFIID riid, PVOID *ppvObject)
{
HRESULT hr = S_OK;
*ppvObject = NULL;
if (riid == IID_IUnknown)
{
*ppvObject = (IUnknown *)this;
MessageBox(NULL,"CAudNotify::QueryInterface(): Returning IUnknown.","call",MB_OK);
}
else if (riid == IID_INmChannelAudioNotify)
{
*ppvObject = (/*INmChannelAudioNotify*/PVOID *)this;
MessageBox(NULL,"CChannelAudioNotify::QueryInterface(): Returning INmChannelAudioNotify.","call",MB_OK);
}
else
{
hr = E_NOINTERFACE;
*ppvObject = NULL;
MessageBox(NULL,"CAudNotify::QueryInterface(): Called on unknown interface.","call",MB_OK);
}

if (S_OK == hr)
{
AddRef();
}

return hr;
}

HRESULT CAudNotify::Connect(IUnknown *pUnk)
{
MessageBox(NULL,"CAudNotify::Connect","call",MB_OK);
return CNotify::Connect(pUnk, IID_INmChannelAudioNotify, (IUnknown *)this);
}

HRESULT STDMETHODCALLTYPE CAudNotify::MemberChanged(NM_MEMBER_NOTIFY uNotify, INmMember *pMember)
{
MessageBox(NULL,"MemberChanged","caudnotify",MB_OK);
PUSER pUser = PUserFromINmMember(pMember);
if(NULL!=pUser) UpdateUserChannel(pUser, (INmChannel *) (CNotify::GetPunk()), uNotify);
return S_OK;
}

HRESULT STDMETHODCALLTYPE CAudNotify::PropertyChanged(DWORD dwReserved)
{
MessageBox(NULL,"call to caudnotify::propertychanged","call",MB_OK);
return S_OK;
}

HRESULT STDMETHODCALLTYPE CAudNotify::StateChanged(NM_AUDIO_STATE uState)
{
//I believe this is where we'll check whether audio is incoming or outgoing and therefore whether to turn on PTT or off
MessageBox(NULL,"call to caudnotify::statechanged","call",MB_OK);
IID iid;
HRESULT hr;
INmChannelAudio *pAudioChannel;
hr = QueryInterface(iid,(void **)&pAudioChannel);
if (SUCCEEDED(hr))
if (uState == NM_AUDIO_TRANSFERRING){
MessageBox(NULL,"Transferring","duh",MB_OK);
if (pAudioChannel->IsIncoming()==S_OK){
PTTOn('A');
}
else{
PTTOn(0);
}
}
// }
return S_OK;
}

There are other bits and pieces of code in the class, but they probably have no connection.

So the problem is I don't even get that messagebox in ::MemberChanged, ::StateChanged, or ::PropertyChanged.

Please help!!
Thanks a million,
Aniel Sud

--UPDATE--

I found that the QueryInterface method is being called with several IIDs that I had not before heard of -- namely IID_IMarshall, IID_IStdMarshall, IID_IexternalConnection, and 0000001B-0000-0000-C000-000000000046. I did a search for IID_IMarshall, and came back with one newsletter that was very vague. But it did say something about requiring marshalling. What is marshalling? do I need it in this instance?

Thanks again for all the help!!

--UPDATE--

I have found out about marshalling, and I don't think I should need it in an app such as this. Moreover, I don't see anything about marshalling in the samples. Is it ok to just let these requests slide?

Thanks again!

Aniel

Re: Netmeeting 3 -- help!

aniel15-Oct-01 8:15

aniel

15-Oct-01 8:15

Did I stump you all? I just need some hints here, folks... I'm running out of ideas.
Thanks!
Aniel

CWnd inside a COleControl does'nt work

Remi Morin12-Oct-01 5:38

Remi Morin

12-Oct-01 5:38

Hi, I have a custom control who have child windows (CWnd) I Know it is possible because we can insert a CButton in a control, CButton is him-self a drived-class from CWnd,

For CButton we have to override the OnDraw function, because this fucntion will be called (instead of the OnPaint commonly used) but this function does'nt exist in a CWnd and DrawItem dosn't seem to work...

ActiveX are hard to do, lot of things to thing and to know, the exception is a rules and what you used to do don't work anymore.

thanks for you'r help

Remi Morin
Rmorin@Operamail.com
Remi.Morin@Lyrtech.com

DCOMCNFG and InstallShield

Firoz12-Oct-01 3:03

Firoz

12-Oct-01 3:03

Hi,

I want to create a setup for my DCOM-Client Application.
The setup will be created using InstallShield-6.

Now, I dont want the end user to go through DCOMCNFG after
running my SetUp program.

I want my Setup Application to do all that as part of the
SetUp process.

Is it possible using InstallShield ??

Also, My client is a VB Application (I cannot use COM library
functions from within my client)

I am sorry if this post is Off-Topic in a DCOM Forum.
But please somebody direct me to a proper solution..

Thanks

Firoz

Re: DCOMCNFG and InstallShield

Tim Smith12-Oct-01 3:11

Tim Smith

12-Oct-01 3:11

All DCOMCNFG does is set registry settings.

If you just want to do the simple settings such as RunAs=InteractiveUser, then installshield should be able to do it. However, if you are talking about setting up default security options, then you might have to do them programatically in a DLL you created called by installshield.

Tim Smith
Descartes Systems Sciences, Inc.

Re: DCOMCNFG and InstallShield

Firoz14-Oct-01 19:26

Firoz

14-Oct-01 19:26

Thanks Tim. Blush | :O

Firoz

HOWTO: Pass VB string into VC++ created ATL Object?

Tim Rymer11-Oct-01 10:31

Tim Rymer

11-Oct-01 10:31

I'm having trouble getting VB to pass in a String into a ATL Object created with VC++ 6.0 -- I dont use MFC. Please help if ya' can! all i really need to know is how to pass in/return... I found some MSDN articles, but they werent using an ATL object. Thanks in advance...

SHABBA!!

Re: HOWTO: Pass VB string into VC++ created ATL Object?

C^hris L^osinger11-Oct-01 10:33

C^hris L^osinger

11-Oct-01 10:33

if the string is input only, use "BSTR". if you need to change the string (output), use "BSTR *".

there are non-MFC classes that can help with BSTR manipulation, such as "bstr_t" and "CComBSTR".

a BSTR is COM's preferred string pasing method.

-c

------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com

COM client structure

Peter Molnar11-Oct-01 8:29

Peter Molnar

11-Oct-01 8:29

Sirs,

this is my first COM adventure so I need your advise.
I have an in process server with lots of interfaces and even more methods in it.
The manufacturer of the dll provides a sample code snippet of how to get pointers to all the interfaces:

//First object
HRESULT hr = ::CoCreateInstance(... 
if ( !FAILED( hr ) ) {

   //First interface
   hr = pIUnknown->QueryInterface(... 
   if ( !FAILED( hr ) ) {
        
      //Second interface
      hr = pIUnknown->QueryInterface(...
      if ( !FAILED( hr ) ) {

         //Third interface
         hr = pIUnknown->QueryInterface(...
         if ( !FAILED( hr ) ) {
            ...
            //Here comes the code that uses the interfaces
            ...
         } else {
            ...//Third interface failed
         }
      } else {
         ...//Second interface failed
      }
   } else {
      ...//First interface failed
   }
} else {
...//CreateInstance failed
}

Why are the QI calls NESTED? I tried putting them after each other but the same code taken from the nested structure didn't work (Runtime library: abnormal program termination) although all interfaces were succesfully created.
I would like to create the appropriate interfaces in my dialogs' OnInitdialogs and release in the OnDestroyWindow. Is that possible? Any sugggestions?

Thanks for your help in advance.

Bunburry

A subject that is beautiful in itself gives no suggestion to the Artist. It lacks imperfection. (O.Wilde)

Re: COM client structure

Amit Dey13-Oct-01 6:21

Amit Dey

13-Oct-01 6:21

The nested QI() calls are probably because the ability to QI a second interface depends on the success or failure of QI() of the first interface.

As to the dialog, OnInitDialog() and OnDestroyWindow() are perfect for creating and releasing COM objects in dialogbased applications.

I'm an alien, I'm an alien
it's a beautiful life....
Bush

Re: COM client structure

Michael Dunn13-Oct-01 7:56

Michael Dunn

13-Oct-01 7:56

I can't tell from your code snippet, but the "Here comes the code that uses the interfaces" part probably uses all three interfaces. Thus all three QIs have to succeed before that code can work.

And BTW it'll be easier to understand if you replace "!FAILED" with "SUCCEEDED" Smile | :)

--Mike--
http://home.inreach.com/mdunn/
"The Earth is doomed." -- Rupert Giles
Heart | [heart]

your

with

and

Where I have to call CoUnInitialize function if I have COM interfaces in (MFC) application main class?

Rula Ghabbiesh11-Oct-01 5:42

Rula Ghabbiesh

11-Oct-01 5:42

I couldn't call CoUnInitialize function in ExitInstance or in class destructor(there will be crash), since I have COM interfaces (member variables)in application main class,(They are smart pointers),so a calling to COM interfaces release function will make the problem.

Last Visit: 31-Dec-99 18:00 Last Update: 3-Jul-24 2:13

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