Determine virtual function table size - COM Discussion Boards

Re: Calling an executable from Internet Explorer as a script?

mejax13-Dec-06 23:00

mejax

13-Dec-06 23:00

Did you browse through
http://msdn.microsoft.com/workshop/browser/ext/extensions.asp

_________________________

"When the superior man refrains from acting, his force is felt for a thousand li." Sun Tzu

Re: Calling an executable from Internet Explorer as a script?

ghost120713-Dec-06 23:17

ghost1207

13-Dec-06 23:17

Yeap! There is an article there called "Adding Entries to the Standard Context Menu", which is relevant with the case, but unfortunately it doesn't mention anything about how the executable should be made (i.e. what interfaces should implement, how they are exposed etc).

Note that the whole thing works if I set the right-click to call a javascript htm page, but not if I call an executable.

..and I am very curious to find what this "\3000" param is..

Re: Calling an executable from Internet Explorer as a script?

Colin Angus Mackay13-Dec-06 23:15

Colin Angus Mackay

13-Dec-06 23:15

Given the big red text that says "Do not post programming questions (use the programming forums for that)" why did you think posting it here would be a good idea?

Your post in the C# forum was a better choice.

Upcoming Scottish Developers events:
* Glasgow: Tell us what you want to see in 2007

My: Website | Blog | Photos

Re: Calling an executable from Internet Explorer as a script?

JacquesDP13-Dec-06 23:23

JacquesDP

13-Dec-06 23:23

And if you look here and then in the C# forum, the lounge has given him more feedback than the C# forum Laugh | :laugh:

He who laughs last is a bit on the slow side

Re: Calling an executable from Internet Explorer as a script?

ghost120713-Dec-06 23:24

ghost1207

13-Dec-06 23:24

I apologize for this. I saw the text only after I hit the "send" button (too overwhelmed with the issue I guess Dead | X|

)

Strange enough, though, I got an answer from this thread instead of the "C#" one!

Re: Calling an executable from Internet Explorer as a script?

Colin Angus Mackay13-Dec-06 23:30

Colin Angus Mackay

13-Dec-06 23:30

ghost1207 wrote:
Strange enough, though, I got an answer from this thread instead of the "C#" one!

Maybe, but you've irritated people in the process.

Upcoming Scottish Developers events:
* Glasgow: Tell us what you want to see in 2007

My: Website | Blog | Photos

PowerPoint Shape Export

Topsen13-Dec-06 21:35

Topsen

13-Dec-06 21:35

Hallo,

I want to export the objects on a powerpoint-slide via office automation.
I use Visual Studio .NET 2005 an Office 2003. When I try the funktion

Shape.Export(filename, PowerPoint.PpShapeFormat.ppShapeFormatGIF, width, height, PowerPoint.PpExportMode.ppClipRelativeToSlide);

i get the images, cliparts, etc.. But they don´t have the specified width and height.
The Dimension of the Shapes differs in horizontal and vertical dpi. How can I set correct DPI-sizes and Pixel-sizes?

Thx,

Tobias

Determine virtual function table size

J.B.13-Dec-06 17:21

J.B.

13-Dec-06 17:21

Hi all,

I am wondering if it is possible to determine the size (or number of valid function entries) of a virtual function table using the queried interface pointer.

Say I obtained an interface pointer pIMyvia QueryInterface:

pIBase->QueryInterface(&IID_MYINTERFACE, (void**)&pIMy, hr);

I was able to cast the pIMy to vtable pointer pVTable and access each each function's address value with pVTable[0], pVTable[1]..etc. And obviously sizeof(pVTable) returns 4 instead of size of the vtable.

Any ideas how it is possible to determine the size virtual function table?

Thanks in advance,
J.B.

Re: Determine virtual function table size

Roger Stoltz13-Dec-06 21:54

Roger Stoltz

13-Dec-06 21:54

Perhaps there's a trick that I'm not aware of, but I don't think you can get the size of the vtable in runtime.

If you create an interface that inherits from IUnknown, the first 12 bytes of the vtable will be the addresses of QueryInterface(), AddRef() and Release(). The next four bytes will contain the address of the first method for the new (child) interface and so on until the vtable is complete. The bytes following the vtable will contain data for the member variables, there's no "padding" or "termination" of the vtable, hence I don't think you can tell the size of it in runtime. Perhaps there's a trick when building for 'Debug', but I don't think so.

On the other hand: why do you want to know the size of the vtable? Confused | :confused:

Perhaps there's another solution for your problem.

--
Roger

"It's supposed to be hard, otherwise anybody could do it!" - selfquote

"No one remembers a coward!" - Jan Elfström 1998
"...but everyone remembers an idiot!" - my lawyer 2005 when heard of Jan's saying above

DLL hell

rockyl12-Dec-06 3:15

rockyl

12-Dec-06 3:15

Hi,

Can some one redirect me to some link where I can find what a DLL problem is.

Thanks:

Rakesh

Re: DLL hell

ShilpiP13-Dec-06 1:37

ShilpiP

13-Dec-06 1:37

http://www.codeproject.com/dll/[^]

Yes U Can ...If U Can ,Dream it , U can do it ...ICAN

Re: DLL hell

Hamid_RT5-Jan-07 21:42

Hamid_RT

5-Jan-07 21:42

In additional see http://www.codeguru.com/cpp/w-p/dll[^]

WhiteSky

Excel runtime error when using matlab excel builder generated objects

juanchete11-Dec-06 21:38

juanchete

11-Dec-06 21:38

I work as a trader I have been programming some matlab functions in order to use them within my excel woorksheets. I am working with Matlab 7 and Excel 2003 SP2 professional edition.
The problem comes when creating the matlab generated object in VBasic

.....
If proyJuanclass Is Nothing Then
Set proyJuanclass = CreateObject("proyJuan.proyJuanclass.1_0")
End If
.....

Then a fatal error ocurs and excel launches a dialog
Microsoft Visual C++ Runtime Library
Runtime Error!
Program: C:\ARCHIV-1\MICROS-2\OFFICE11\EXCEL.EXE
abnormal program termination

when clicking the "OK" button excel closes
I have used the "mxltool" that comes with the Matlab Excel Builder
I have executed the MCRInstaller
I have registered the dll generated by the mxltool

Which C# Book is the best for Intermediete programmer.

karam chandrabose10-Dec-06 20:29

karam chandrabose

10-Dec-06 20:29

Hi,
Am a Intermediete C# programmer,
can you please guide me which will be the best book to buy?
thanks and regards
Karam C Bose

Thanks in advance

Re: Which C# Book is the best for Intermediete programmer.

karam chandrabose10-Dec-06 22:21

karam chandrabose

10-Dec-06 22:21

sorry!
i should have posted this in C# forum.!!! D'Oh! | :doh:

Re: Which C# Book is the best for Intermediete programmer.

Hamid_RT5-Jan-07 21:43

Hamid_RT

5-Jan-07 21:43

In additional you can see articles that are on the codeproject about C# Smile | :)

WhiteSky

_variant_t Question

Gupta Suraj7-Dec-06 22:48

Gupta Suraj

7-Dec-06 22:48

Hi All,

Description of Problem:-

I have a interface pointer to some custom dual interface. I am creating a object of _variant_t class like "_variant_t vtSample(pICustom);".

vtSample is created and assigned value as 'TRUE' and its vt as VT_BOOL.
It should have been VT_DISPATCH instead of VT_BOOL and value as some memory address.

Can anyone explain the above behavior?

Thanks...

Suraj Gupta

Re: _variant_t Question

prasad_som7-Dec-06 23:02

prasad_som

7-Dec-06 23:02

Can you show some code ?

Gupta Suraj wrote:
I am creating a object of _variant_t class like "_variant_t vtSample(pICustom);".

vtSample is created and assigned value as 'TRUE' and its vt as VT_BOOL.

Why you are assigning its vt as VT_BOOL.

Gupta Suraj wrote:
It should have been VT_DISPATCH instead of VT_BOOL and value as some memory address.

Can anyone explain the above behavior?

I'm confused here to understand your problem. Can you explain in detail.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: _variant_t Question

Gupta Suraj7-Dec-06 23:26

Gupta Suraj

7-Dec-06 23:26

Hi Prasad,

Thanks for the reply...

I am not explicitly assigning vt to VT_BOOL.

"_variant_t vtSample(pICustom);"

The above statement is causing vtSample object to be instantiated and initialized with vt= VT_BOOL and its value as 'TRUE'.

As pICustom is dual interface pointer so value of vtSample should be pointer to v-table and its vt should be VT_DISPATCH not VT_BOOL.

I don't know why it so?

Am I able to make you understand the problem?

Thanks...

Suraj Gupta

Re: _variant_t Question

prasad_som8-Dec-06 1:49

prasad_som

8-Dec-06 1:49

Gupta Suraj wrote:
"_variant_t vtSample(pICustom);"

Can you show code snippet, how you are using this interface? There is no way it should assign vt as VT_BOOL , unless pICustom is BOOL.
While debugging, you can step through the contructor of _variant_t , see which contructor is been called.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: _variant_t Question

Gupta Suraj8-Dec-06 3:26

Gupta Suraj

8-Dec-06 3:26

Thanks Prasad...

Actually,pICustom is a smart pointer. So when "vtSample(pICustom)" is executed, bool operator of _com_ptr template class is called. What I think is that the best matching constructor of _variant_t class is that which takes a bool as its paramter.So first bool operator of _com_ptr is called to convert the parameter to bool.

We don't have a overloaded constructor of _variant_t class which takes smart pointer as its parameter.

Please send your comment on this. Am i thinking in right direction?

Suraj.

Suraj Gupta

Re: _variant_t Question

Ed Gadziemski8-Dec-06 18:29

Ed Gadziemski

8-Dec-06 18:29

Try explicitly casting your object to an IDispatch pointer, for example (IDispatch *)pICustom. That should eliminate falling through to bool.

Re: _variant_t Question

Gupta Suraj10-Dec-06 17:44

Gupta Suraj

10-Dec-06 17:44

Thanks...It worked...

Suraj Gupta

Re: _variant_t Question

prasad_som10-Dec-06 21:29

prasad_som

10-Dec-06 21:29

Though, you had a solution to your problem;

Gupta Suraj wrote:
bool operator of _com_ptr template class is called.

Which operator bool you are talking about ? In fact, it should return you custom interface type.
Its implementated like this,

operator T*()   {
    return p;

So I feel, it should return interface pointer.
Can you show how you have declared this interface ?

Gupta Suraj wrote:
We don't have a overloaded constructor of _variant_t class which takes smart pointer as its parameter.

No, CComPtr, will be called for operator T*. Which returns appropriate interface pointer.
i.e. consider this declaration,

CComPtr<IMyInterface> pMy;
_variant_t f(pMy);

Here,in second statement pMy->Operator T* will be get called first. Which returns IMyInterface*.
So, it will set for VT_IDISPATCH automatically.
You dont even need to cast it.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: _variant_t Question

Gupta Suraj11-Dec-06 18:28

Gupta Suraj

11-Dec-06 18:28

Hi Prasad,

Here is code snippet of my application..

// Smart pointer(SampleObjects::ISampleSetDualPtr) typedef declarations
_COM_SMARTPTR_TYPEDEF(ISampleSetDual, __uuidof(ISampleSetDual));
// Smart pointer typedef declarations

SampleObjects::ISampleSetDualPtr pMutipleValues = SampleObjects::ISampleSetDualPtr )propertyPtr->Value;

_variant_t vtMultiValue(pMutipleValues);//This statement first causes bool operator of template class _com_ptr_t being called and then overloaded constructor of _variant_t class being called which takes bool as input parameter.

template<typename _iiid=""> class _com_ptr_t
{
......
......
......
operator bool() const throw()
{
return m_pInterface != NULL;
}
}

Please let me know your input on this.

Thanks,
Suraj

Suraj Gupta

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