COM Discussion Boards

Re: Get COM object's instance handle

Hans Ruck23-Apr-03 5:32

Hans Ruck

23-Apr-03 5:32

Just exporting it by a long property will be enough. You don't need to use VARIANT.

rechi

meaning of HRESULTs in Office Automation

moredip14-Apr-03 12:00

moredip

14-Apr-03 12:00

Hi all,

Can anyone tell me how I an find out what a specific HRESULT error code means? The specifics are that I'm trying to set the text of a Bookmark in Word (using C#), but I keep geting a COMException which only tells me that the attempt to set Bookmark.Text failed, and supplies an errorCode. I'd like a bit more info - i.e. why it failed Roll eyes | :rolleyes:

are the Office Automation errorcodes documented anywhere? I can't seem to find anything on MSDN.

TIA,

Pete

how to get client's icon?

mojimejl12-Apr-03 5:06

mojimejl

12-Apr-03 5:06

hello!

is there any way to get remote client's icon (from its executable file for example) by my server (com application)?

thanks in advance.

max da man

Re: how to get client's icon?

pba_13-Apr-03 7:40

pba_

13-Apr-03 7:40

Maybe you can make the client to return to the server a picture object ( see IPicture OLE implementation in MSDN).

Re: how to get client's icon?

Brian Shifrin13-Apr-03 17:41

Brian Shifrin

13-Apr-03 17:41

using typelib read name of executable/dll and try LoadResource (icon)?

Just a guess..

i am new in COM: what are COMs ?

Sendel11-Apr-03 15:53

Sendel

11-Apr-03 15:53

What is COM and what do I use it for ?
I am programming in Visual C++ 6.0 - do I need to know what COM is ? Confused | :confused:

eek:

can someone explain it to me like if I am a 3 years old child ?
thanks alot

Sendel

Re: i am new in COM: what are COMs ?

Michael Dunn11-Apr-03 16:20

Michael Dunn

11-Apr-03 16:20

I recommend Introduction to COM - What It Is and How to Use It[^] Smile | :)

--Mike--
THERE IS NO THERE IS NO BUT THERE IS MAGIC PIXIE DUST BUSINESS GENIE CODE PROJECT

Homepage | RightClick-Encrypt | 1ClickPicGrabber
"You have Erica on the brain" - Jon Sagara to me

Re: i am new in COM: what are COMs ?

Sendel11-Apr-03 16:40

Sendel

11-Apr-03 16:40

thanks

Sendel

there is no spoon

_RecordsetPtr Detach / Debug Exception

Ecator11-Apr-03 6:52

Ecator

11-Apr-03 6:52

Hi!

I'm new to posting here, but I wanted to start out with an annoying
feature that was bugging me. I get to do a lot of the weird programming
assignments.....

I've got a ATL/COM Service that has one Simple ATL Apartment object. It takes a flat
file record and converts it into a one row recordset with appropriate columns.

It has a method to pass a detached recordset back and forth, such as this:

[id(2), helpstring("method ReadRecord")] HRESULT ReadRecord([in, out] VARIANT *iRetVal, [out, retval] IUnknown **ppRecordset);

STDMETHODIMP CGenericObj::ReadRecord(VARIANT *iRetVal, IUnknown **ppRecordset)

It works perfectly fine, except when you get into the debugger, and only once you get
out of the raw_ReadRecord.

First-chance exception in Generic.exe (KERNEL32.DLL): 0xE06D7363: Microsoft C++ Exception.

But, everything works fine, even in release mode. When I don't detach the recordset, the message does not surface. When the object is passed back in through:

STDMETHODIMP CGenericObj::WriteRecord(IUnknown *pRecordset, VARIANT *iRetVal)

It does the same thing.

The code to generate it:

_RecordsetPtr m_pRs;
m_pRs.CreateInstance(__uuidof(Recordset));

(read field loop)

m_pRs->Fields->Append(_T((LPCSTR)pField.sExternalName), lEnum, lFieldSize, adFldIsNullable);

(read field loop end)

_variant_t vNull(DISP_E_PARAMNOTFOUND,VT_ERROR);
m_pRs->Open(vNull,vNull,adOpenForwardOnly, adLockOptimistic, adCmdUnknown);

m_pRs->AddNew();

(read file field loop)

m_pRs->Update();

*ppRs = m_pRs.Detach();

Just curious what you coders think....

Re: _RecordsetPtr Detach / Debug Exception

pba_13-Apr-03 7:31

pba_

13-Apr-03 7:31

What's the exception code ?

Re: _RecordsetPtr Detach / Debug Exception

Ecator13-Apr-03 17:53

Ecator

13-Apr-03 17:53

Heh, as it reads in the question itself (First Chance exception....), only unless you turn off automatic handling of that exception, it just does a print to the debug window....

Ah well...perhaps I didn't build the object right...

Re: _RecordsetPtr Detach / Debug Exception

pba_14-Apr-03 4:11

pba_

14-Apr-03 4:11

"First chance exception in ... : Microsoft C++ Exception" means a C++ exception is thrown but not catch. Try to wrap up your method call in a try / catch statement, and catch a _com_error exception. Take a look at the error code.

Re: _RecordsetPtr Detach / Debug Exception

Ecator14-Apr-03 6:20

Ecator

14-Apr-03 6:20

Its just an access violation in Kernel32 once the raw_ function loses scope, which means it could be anything, so I think I'll just drop it. Ah well, I've got to get back to DOS programming now....

How to load multiple internet shortcuts by IUniformResourceLocator

sning10-Apr-03 7:48

sning

10-Apr-03 7:48

I can create MULTIPLE internet shortcuts by the following code

CComQIPtr<IUniformResourceLocator, &IID_IUniformResourceLocator> m_spURL;
CComQIPtr<IPersistFile, &IID_IPersistFile> m_spPF;

CoCreateInstance(CLSID_InternetShortcut, NULL, CLSCTX_INPROC_SERVER, IID_IUniformResourceLocator, (LPVOID*) &m_spURL);
if (m_spURL == NULL) return E_FAIL;
m_spPF = m_spURL;
if (m_spPF == NULL) return E_FAIL;

m_spURL->SetURL(strUrl1, 0);
m_spPF->Save(strFile1.AllocSysString(), TRUE);

m_spURL->SetURL(strUrl2, 0);
m_spPF->Save(strFile1.AllocSysString(), TRUE);

m_spURL->SetURL(strUrl3, 0);
m_spPF->Save(strFile3.AllocSysString(), TRUE);

But trying to load more than one shortcuts will fail

hr = m_spPF->Load(strFilename1.AllocSysString(), STGM_READ); //return S_OK
LPSTR lpTemp1 = NULL;
hres = m_spURL->GetURL(&lpTemp1);
if (SUCCEEDED(hres))
{
    IMalloc* pMalloc;
    hres = SHGetMalloc(&pMalloc);
    if (SUCCEEDED(hres))
    {
        pMalloc->Free(lpTemp);               // this is a copy from msdn, works well
        pMalloc->Release();
    }
}

// try load the second url file
hr = m_spPF->Load(strFilename2.AllocSysString(), STGM_READ); //return E_FAIL
DWORD E = GetLastError();                   //return 0, no further information

Did I forget release something? is there something like "close" I have to call? Of course, I can release both interface
and create a new one, but why I can save multiple urls? also, Is createinstance consider an expensve function call?

Thanks for help!
Shawn

Access Denied When Automating PowerPoint with VC++

User 15945410-Apr-03 5:08

User 159454

10-Apr-03 5:08

Hi All,

I'm working on a small project which converts PowerPoint documents to SWF. The convertor contains of two parts, the PPT extractor and the SWF composer. The extractor basically traverses the presentation's object model and extracts information that it understands and stores them. The problem I'm getting is when accessing certain objects (such as _Presentation->_Slide->Shape->Vertices or _Presentation->_Slide->Shape->Adjustments) using the raw interface I got E_ACCESSDENIED return code. Here's an excerpt of the code:

// Env: Windows XP, Office 2000

#import "MSO9.DLL" auto_rename
#import "VBE6EXT.OLB" auto_rename
#import "MSPPT9.OLB" auto_rename

using namespace PowerPoint;

...

PowerPoint::ShapePtr aShape = ...;

VARIANT aVertices;
HRESULT hRes = aShape->get_Vertices(&aVertices);

And now hRes is E_ACCESSDENIED. This happens to some other objects too. I've read some MSDN articles talking about Office automation is unsupported etc. So my questions are, how should I deal with these Access Denied errors? Does this look like a setting problem, or is it VC++? Will this become better if I use VB? The reason I use VC++ is I want to make the extract and the composer one single program. I'm not fluent in VB but if I make sure this could be solved in VB then I'd definitely like to try it. Any suggestion is appreciated!

Thanx, and Best,
Darrel Confused | :confused:

How to keep a C++ com dll in memory?

Anonymously10-Apr-03 3:52

Anonymously

10-Apr-03 3:52

I have a com dll written in C++ which is used in asp applications. The dll contains only one com object. There are static (global to the process) data objects within this dll. Obviously, I only want to initialize these static objects when the dll is first loaded.

However, IIS seems to be reloading my dll everytime the com object is created and used in an asp page.

Re: How to keep a C++ com dll in memory?

pba_10-Apr-03 4:14

pba_

10-Apr-03 4:14

The proper way to do it is to make your server a service, if your objects need to have some context setup once per session. The answer to your question is to return allways S_FALSE from DllCanUnloadNow. In case you are using ATL you can achieve this by having a CAtlModule::Lock call without CAtlModule::Unlock pair.

Re: How to keep a C++ com dll in memory?

Anonymously10-Apr-03 4:59

Anonymously

10-Apr-03 4:59

Thanks for the help. I don't want to make my com dll a service right now. I tried to return S_FALSE in DllCanUnloadNow and also called CAtlModule::Lock without calling Unlock. Doesn't seem to work.

I remember when building a com dll in VB6, you can specify a project setting called "retained in memory" which will do exactly what I want. Is there an equivalent of this feature in VC++?

Re: How to keep a C++ com dll in memory?

pba_13-Apr-03 7:17

pba_

13-Apr-03 7:17

Returning S_FALSE from DllCanUnloadNow should leave the dll loaded. I don't know VB, so I cannot tell exactly what that property does, but I suppose it will do the same thing ( return false from can unload now). Did you check if it's the same process ? ( maybe the process will exit, so normally all the dlls will be unloaded).

Client with flexible server name.

MauriceMG9-Apr-03 22:40

MauriceMG

9-Apr-03 22:40

I am new in COM programming so I have a question that is maybe very simple for you, but I do not know the answer.

My client and server applications are running on two different PC's, so I have a remote connection. I want to implement the client in such a way that the user can change the name of the PC where the server is running. I want this to be flexible for future changes if the server has to be installed on another PC.

Can someone explain me how to solve this? Do you have an URL where I can find an example with the solution for my problem.

Thanks.

MauriceMG

Re: Client with flexible server name.

pba_10-Apr-03 4:17

pba_

10-Apr-03 4:17

See the answer to "DCOM & Dual Lan" below [^]

Re: Client with flexible server name.

MauriceMG10-Apr-03 20:04

MauriceMG

10-Apr-03 20:04

My problem is solved now.

Thanks for your reaction.

MauriceMH

Detecting the apartment

Dave Bryant9-Apr-03 9:54

Dave Bryant

9-Apr-03 9:54

Does anyone know if there is a function I can call to determine if I an inside a STA or a MTA (apart from calling CoInitializeEx and checking for RPC_E_CHANGED_MODE).

Dave
http://www.cloudsofheaven.org

Re: Detecting the apartment

Vi29-Apr-03 23:14

Vi2

9-Apr-03 23:14

Looking for "DebugCoQueryApartmentID" word in MSDN's Bugslayer 1998[^].

With best wishes,
Vita

Re: Detecting the apartment

Dave Bryant10-Apr-03 9:51

Dave Bryant

10-Apr-03 9:51

Thanks

Dave
http://www.cloudsofheaven.org

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