Calling an executable from Internet Explorer as a script? [modified] - COM Discussion Boards

chrigi00115-Dec-06 3:15

15-Dec-06 3:15

Hi
First: I know there are many topics in codeproject about using BSTR but i cant help myself further after 2 days trying to solve this problem...

1) Situation
============
My task is to write a program in VC++ which makes a windows program communicate to a sensor (MTi). There is a fully functional command line program from the producer of the sensor. Now i want to change severel settings (using specific functions) of the sensor like sample frequency and so on. The main function makes a Motion Tracker Object (written in c) to realize the communication through a virtual COM Port.

2) Problem
==========
I want to change the sample frequency of the data exchange between the program and the sensor (default it is 100Hz which is to fast for my application):

<br />
int nSFreq=25; //Sample Frequency in Hz<br />
int nUSFreq=0; //Used sample Frequency<br />
//Set new sample Frequency where pMT is the created Motion Tracker Object<br />
pMT->MT_SetMotionTrackerSampleFrequency(nSFreq);<br />
//Show the Sample Frequency for checkup <br />
MT_GetMotionTrackerSampleFrequency(&nUSFreq);<br />
//Show it on command Line<br />
printf("Your sample Frequency %d", nUSFreq);<br />

--> the command line shows 25 as expected, but the sensor samples still with 100Hz. Now i read that i have to safe the settings on the sensor using the sensor ID which is a BSTR. The ID i can get from this function:

<br />
//get the device ID<br />
virtual HRESULT STDMETHODCALLTYPE MT_QueryMotionTrackerB(<br />
            /* [out] */ BSTR __RPC_FAR *bstrDeviceID) = 0;<br />
//safe the new settings trough this function<br />
virtual HRESULT STDMETHODCALLTYPE MT_SaveToMTS( <br />
            BSTR bstrDeviceID) = 0;<br />

--> now, what i have done in my program:

<br />
BSTR nDId;<br />
//get the Device ID<br />
pMT->MT_QueryMotionTrackerB(&nDId);<br />
//safe settings<br />
pMT->MT_SaveToMTS(nDId);<br />

-->The program compiles very nice but when i run the .exe i got this damn error message all the time:
"An exception 'System.NullRefereceException' has occured in MTi.cmd1.exe"
(-->The error is only caused when i use the BSTR function shown above)

I know the problem is this BSTR but i cant help myself. Maybe someone can tell me what i need to do.
1000Thx

chris

Re: using BSTR

lafleon15-Dec-06 8:51

lafleon

15-Dec-06 8:51

Hi,

Just use CComBSTR instead of BSTR and use CString to convert from BSTR to char* and visa versa.

Regards

Re: using BSTR

prasad_som15-Dec-06 19:14

prasad_som

15-Dec-06 19:14

chrigi001 wrote:
-->The program compiles very nice but when i run the .exe i got this damn error message all the time:
"An exception 'System.NullRefereceException' has occured in MTi.cmd1.exe"
(-->The error is only caused when i use the BSTR function shown above)

Problem may not be with BSTR as you think. Can you check if MT_QueryMotionTrackerB gives value correctly. Or which function of them is giving exception.

chrigi001 wrote:
"An exception 'System.NullRefereceException' has occured in

Generally, this exception occurs due to accessing NULL pointer as it indicates. See by placing checks at places wherever you can.

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

How to debug

skylarmei14-Dec-06 15:52

skylarmei

14-Dec-06 15:52

Please tell me how to debug in add_ins;There is some problem in my programme,but i not know how to debug it ;please help!

Re: How to debug

Anton Afanasyev14-Dec-06 16:06

Anton Afanasyev

14-Dec-06 16:06

Sorry, we dont lease help here Big Grin | :-D

Badger | [badger,badger,badger,badger...]

Re: How to debug

skylarmei14-Dec-06 16:10

skylarmei

14-Dec-06 16:10

sorry

Re: How to debug

prasad_som16-Dec-06 0:01

prasad_som

16-Dec-06 0:01

You need to give host exe's path to debug your add-in. And put break point in connecting function of your add-in. i.e. function through which add-in and host application communicate. And follow usual debugging technique.

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

Calling an executable from Internet Explorer as a script? [modified]

ghost120713-Dec-06 22:30

ghost1207

13-Dec-06 22:30

Hi all,

I am not too sure where to post my question, so I'll just put it here and hope that somebody will help me. Honestly, I've reached a deadend after searching ALOT. I'll greatly appreciate any help or indication.

The problem:
In Internet Explorer you can right-click on a page and hit "Export to Microsoft Excel". This command is set in the registry (HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\MenuExt\Export to Microsoft Excel) to call Excel with "EXCEL.EXE/3000".

The purpose:
I would like to develop a executable with simular functionality: the ability to be called from the internet explorer.

The question:
What is the technology that excel is using? Is it a COM object implementing an interface? How do I do that in .NET? And what on earth is that "/3000" parameter?!?

I've been looking for an answer for quite some time now. Please help.

Rgds,
G.

-- modified at 5:36 Thursday 14th December, 2006

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

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