COM Discussion Boards

Re: [SOLVED] VARIANT_BOOL return value in Automation class

User 21559712-Jan-07 4:11

12-Jan-07 4:11

Roger Stoltz wrote:
Try and change your return type back to BOOL in your .cpp and .h files, not in the .idl file. Rebuild and see what happens.

Overwhelmed Smile | :)

So called it SOLVED.

Roger Stoltz wrote:
This is rather funny how we can misinterpret each other, because now I have to ask if this is big-endian or little-endian. If you've copied this directly from the memory debug window it would be little-endian and in that case the value would be 0x00140000 which is 1310720 in decimal. I assume this is the case since it would make more sense to me. My point is that the lower 16 bits that may represent the VARIANT_BOOL type is still equal to VARIANT_FALSE

Yeah, I thought about it Smile | :)

That is the reason why I copied the values exactly from my memory window, but forgot to mention about it Smile | :)

So it still remained ambiguos

Roger Stoltz wrote:
Ok, but in my opinion you've only found where it goes wrong, not why

This change has solved the problem! I now think the problem is in Wizard generated code! What do you think?

BTW thank you for followup and your in depth reply. my 5s for you Smile | :)

S o h a i l K a d i w a l a

To Err Is Human; to Debug, Divine

modified 21-Apr-21 21:01pm.

Re: [SOLVED] VARIANT_BOOL return value in Automation class

Roger Stoltz12-Jan-07 4:40

Roger Stoltz

12-Jan-07 4:40

Sohail Kadiwala wrote:
That is the reason why I copied the values exactly from my memory window, but forgot to mention about it

I suspected that, but I got a little confused when you wrote that it evaluated to 5120 in decimal. Don't worry about it!

Sohail Kadiwala wrote:
I now think the problem is in Wizard generated code! What do you think?

Well, partly true.
I haven't found a way to make the wizard to use VARIANT_BOOL as type anywhere. That could be a problem and if so you have to explicitly modify it and that could be considered a "problem" in the wizard generated code.
But, I think the return types in your source code files (.cpp and .h) have been manually modified and if that's the case we cannot blame the wizard. :->

Sohail Kadiwala wrote:
thank you for followup and your in depth reply.

You are most welcome! Rose | [Rose]

I'm glad if I was able to help you.

Sohail Kadiwala wrote:
my 5s for you

Let me express my most humble gratitude for that. Blush | :O

All in all it feels good to leave for the weekend after nailing this one.

Have a nice weekend Sohail
--
Roger

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

Re: [SOLVED] VARIANT_BOOL return value in Automation class

User 21559712-Jan-07 5:24

User 215597

12-Jan-07 5:24

Roger Stoltz wrote:
Let me express my most humble gratitude for that.

Someone who sincerely helps should deserve atleast a 5 on CP Smile | :)

Roger Stoltz wrote:

Sohail Kadiwala wrote:
I now think the problem is in Wizard generated code! What do you think?

Well, partly true.
I haven't found a way to make the wizard to use VARIANT_BOOL as type anywhere. That could be a problem and if so you have to explicitly modify it and that could be considered a "problem" in the wizard generated code.
But, I think the return types in your source code files (.cpp and .h) have been manually modified and if that's the case we cannot blame the wizard.

I don't think I modified the source files (.H and .cpp). To confirm this, in my sample application, I added another COM method to my interface selecting the return type to be VARIANT_BOOL. The result was VARIANT_BOOL data type as the return type in .H and .CPP files.

Now, this makes me curios - What version of Visual Studio are you using?
I am using MSDE 2003 version 7.1.3088

Roger Stoltz wrote:
All in all it feels good to leave for the weekend after nailing this one.

Have a nice weekend

Yes, I am also feeling happy to nail this one, although I could still have moved ahead with my work with some alternate declaration. But with you around and eager to help, I pushed myself a bit harder. Its been a long time since I got stuck with such a time consuming problem - so I am feeling a lot happy nailing it.

You have a great weekend.

I still have an hour before I head home, came late for work so need to wait some more time completing stuff.

Warm Regards,

S o h a i l K a d i w a l a

To Err Is Human; to Debug, Divine

modified 21-Apr-21 21:01pm.

Re: [SOLVED] VARIANT_BOOL return value in Automation class

Roger Stoltz12-Jan-07 5:37

Roger Stoltz

12-Jan-07 5:37

Sohail Kadiwala wrote:
I am using MSDE 2003 version 7.1.3088

That explains it. I'm still using VC6.

Sohail Kadiwala wrote:
I still have an hour before I head home, came late for work so need to wait some more time completing stuff.

Either you don't arrive at work until the afternoon or you're not located in India as your profile claims... I hope it's the latter one.

In Sweden the time is now 17:35 and I'm about to leave for the weekend in half an hour.

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

Re: [SOLVED] VARIANT_BOOL return value in Automation class

User 21559714-Jan-07 7:50

User 215597

14-Jan-07 7:50

Roger Stoltz wrote:
Either you don't arrive at work until the afternoon or you're not located in India as your profile claims... I hope it's the latter one.

I do arrive on time at work. At present, I am in Hampshire County, UK. Weekend is over now, and I am planning for my day tomorrow Smile | :)

S o h a i l K a d i w a l a

To Err Is Human; to Debug, Divine

modified 21-Apr-21 21:01pm.

COM and windows service application ...

Sakthiu9-Jan-07 0:31

Sakthiu

9-Jan-07 0:31

Dear All,

I have Windows Service Application that has one COM Interface.

Here My problem is that when change this application to service i am facing a problem. sometimes the COM interface gets handle first or the main application gets handle. Once the main application gets handle, I can not call its COM interface functions.. Why ?

Thanks.

Nice things do nice works

How can get information from web page ?

ankprasanna9-Jan-07 0:22

ankprasanna

9-Jan-07 0:22

by inserting javascript in a webpage, how can we get information from web page like no.of images, sections, headings...?

COM dll internals.

HakunaMatada8-Jan-07 19:21

HakunaMatada

8-Jan-07 19:21

What is the difference between a COM dll and a regular dll? I would like to know how memory is managed for both the dlls. Does a regular dll get loaded into the calling application's memory space each time an application makes call to one of its functions or does it get loaded into a global heap? How is this different from a COM dll?

Thanks.

---

Hakuna-Matada Beer | [beer]

It means no worries for the rest of your days...
It's our problem free, Philosophy
Jig | [Dance]

"I think my response was 'What idiot dreamed this up?'" -- Mary Ann Davidson, Oracle's chief security officer, in typical blunt manner, remembering her reaction to the company's scheme to brand its databases as "unbreakable."

Re: COM dll internals.

Phil Harding15-Jan-07 3:45

Phil Harding

15-Jan-07 3:45

HakunaMatada wrote:
What is the difference between a COM dll and a regular dll

As DLL's go, there is no difference. Both types have function exports, both types are mapped into the address space of the loading process (and shared across processes).

All COM DLL's have a common and specific set of function exports, whereas regular DLL's have exports specific to the DLL module.

Phil Harding.
myBlog [^] | mySite [^]

System monitor using WMI

abhiramsss8-Jan-07 12:26

abhiramsss

8-Jan-07 12:26

Hi

i want some help from you regarding vbscript and WMI

suppose there are five systems in a network say 1 2 3 4 5 and iam monitoring other systems from system 1. so whenever I run a script it should tell me what are the other systems running in the network and write the output to a log file. and the script should check for a folder and the files in that folder on remote machines and writes to the log file on the monitoring systyem i.e on system 1

can u please help me with a script example for this

Thanks in Advance

abhi

COM on Linux?

Josh Smith8-Jan-07 10:27

Josh Smith

8-Jan-07 10:27

I'm on a project where they are considering the idea of creating a COM object to expose some functionality. I don't have any COM experience, so I figured I ask the experts for some guidance.

One concern is that there is a possibility that functionality will need to eventually be hosted on a Linux server. In other words, the COM object will be communicated with from a Windows client to a Linux box via messaging.

I've searched the Web to see what has been written on this subject, but didn't find much information on the subject. Is there good support for developing/using COM objects in Linux? If so, I'd appreciate it if you could post a link to information about the issues/risks/etc to keep in mind when designing the COM class. If not, what makes it a problem?

Thanks for any help.

:josh:
My WPF Blog[^]

We are what we repeatedly do. Excellence then, is not an act, but a habit. - Aristotle

Re: COM on Linux?

Christian Graus8-Jan-07 11:22

Christian Graus

8-Jan-07 11:22

I doubt there is COM on Linux. CORBA, probably.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Re: COM on Linux?

Josh Smith8-Jan-07 11:59

Josh Smith

8-Jan-07 11:59

Thanks for the feedback.

:josh:
My WPF Blog[^]

We are what we repeatedly do. Excellence then, is not an act, but a habit. - Aristotle

Re: COM on Linux?

Jörgen Sigvardsson8-Jan-07 13:18

Jörgen Sigvardsson

8-Jan-07 13:18

There is plenty of COM on Linux. Smile | :)

--
LOADING...

Re: COM on Linux?

Josh Smith9-Jan-07 3:48

Josh Smith

9-Jan-07 3:48

Joergen Sigvardsson wrote:
There is plenty of COM on Linux.

Do you have any advice or information to share regarding COM on Linux? Are there a lot of problems when creating a COM object to be used on both Windows and Linux? If so, are they bad enough to warrant "second thoughts" about whether it is a reasonable thing to do?

:josh:
My WPF Blog[^]

We are what we repeatedly do. Excellence then, is not an act, but a habit. - Aristotle

Re: COM on Linux?

Jörgen Sigvardsson9-Jan-07 4:27

Jörgen Sigvardsson

9-Jan-07 4:27

When it comes to DCOM, there should be no problems, as all communication is made over the wire. When it comes to COM - the binary standard, it will probably not work out of the box. Last time I checked, g++ did not generate ABI-compatible vtables compatible with the VC++ compiler. Some hackery in C + Wine might do the trick, but it's nothing I would like to maintain...

If you can manage to recompile components for Linux, then there is no real problem as far as binary compatibility goes.

EntireX is a system I played with a long time ago, and from what I can tell, it's still around - although unsupported! There might be other solutions too. I know there are other products for other Unix-operating systems (if I recall correctly, Microsoft bought it from Mainsoft (I think their name was) when they ported IE to Solaris).

I am however a bit skeptical about using COM-technology with Linux. It's akin to pushing a cube through a round hole - it just doesn't fit very well. Are there any specific reasons why you won't make the COM-objects to act like proxies on the Windows-side? It would be an easy task to hook it all up with RPC between Linux and Windows through the proxies. That way you can have proxy objects for communication with Linux servers, and "regular" objects for communication with Windows servers.

Is transparency is an absolute and unalterable requirement? Also, is there a design that you have to adher to, or do you have free reign on the design?

--
Verletzen zerfetzen zersetzen zerstören
Doch es darf nicht mir gehören
Ich muss zerstören

Re: COM on Linux?

Josh Smith9-Jan-07 7:45

Josh Smith

9-Jan-07 7:45

First of all, thanks a lot for the help. I really appreciate it!

Joergen Sigvardsson wrote:
I am however a bit skeptical about using COM-technology with Linux.

Me too!

Joergen Sigvardsson wrote:
Is transparency is an absolute and unalterable requirement? Also, is there a design that you have to adher to, or do you have free reign on the design?

This is a "top down" design approach, where high-level executives push down their decisions on low-level technical details. I'm just looking for ammo to shoot back with. Smile | :)

:josh:
My WPF Blog[^]

We are what we repeatedly do. Excellence then, is not an act, but a habit. - Aristotle

Re: COM on Linux?

Stephen Hewitt8-Jan-07 11:46

Stephen Hewitt

8-Jan-07 11:46

See here[^].

Steve

Re: COM on Linux?

Josh Smith8-Jan-07 11:59

Josh Smith

8-Jan-07 11:59

Thanks for the feedback.

:josh:
My WPF Blog[^]

We are what we repeatedly do. Excellence then, is not an act, but a habit. - Aristotle

how can I embed a frame on an html page Using Com

georgekjolly7-Jan-07 20:30

georgekjolly

7-Jan-07 20:30

Hi all,

I am doing a project using COM. I need to embedd my own html page as a frame in a page accessed from internet.

For Eg: I am accessing google.com , and with the help of my COM ,I should be able to embedd my own html page as a frame on the google page .

Is it Possible ??.

Thanks
George

Re: how can I embed a frame on an html page Using Com

Monty²7-Jan-07 21:03

Monty²

7-Jan-07 21:03

georgekjolly wrote:
am doing a project using COM. I need to embedd my own html page as a frame in a page accessed from internet.

Thats probably the weirdest thing i heard, why would you want to do this?

If you think you can than you can, if you think you can't you are right.

Activex Properties

Don Fletcher7-Jan-07 13:01

Don Fletcher

7-Jan-07 13:01

Hi,

I've used the MFC class wizards in VC2003 to create a wrapper for an ActiveX control (derived from CWnd). I've then successfully embedded that control into a window and it works beautifully (so far so good).

My question is, how can I invoke the control's standard Property dialog from within MFC? I need to give the user access to the control's properties at runtime, but so far have not had any luck doing this.

Can anybody help?

- Don

.olb and .tlb

HakunaMatada6-Jan-07 0:32

HakunaMatada

6-Jan-07 0:32

What is the difference between these two?

Can anyone help?

---

Hakuna-Matada Beer | [beer]

It means no worries for the rest of your days...
It's our problem free, Philosophy
Jig | [Dance]

Re: .olb and .tlb

Rory Solley10-Jan-07 22:57

Rory Solley

10-Jan-07 22:57

None, aside from the naming convention.

Event Calendar

unwind_now5-Jan-07 4:06

unwind_now

5-Jan-07 4:06

I'm trying to modify a Event Calendar available here as a demo to use a sql database but have not been successful.
If anyone thinks they can help, or have something I can work with I would appreciate it.

Thanks in advance...

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