Passing window to a different process? - C / C++ / MFC Discussion Boards

Re: Help Wanted to display dlg box frm the Service

ThatsAlok15-Jun-04 0:58

15-Jun-04 0:58

Yeah i got the solution.
i have made my service desktop interactive.
all of my problem has been solved thanks for your concern.

now i will use winlogon notifcation package to know wheather the user is login or not
thanks any way

I Think It will Work
Alok Gupta
visit me at http://www.thisisalok.tk

Re: Help Wanted to display dlg box frm the Service

Antony M Kancidrowski11-Jun-04 6:04

Antony M Kancidrowski

11-Jun-04 6:04

I suggest that if you write a GUI application that interogates the service. Windows services run before users login and indeed run without a desktop.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fuity and sweet.
I'm jelly, what am I? - David Williams (Little Britain)

Re: Help Wanted to display dlg box frm the Service

ThatsAlok11-Jun-04 23:49

ThatsAlok

11-Jun-04 23:49

how a Gui application interact with service,have you any idea.
i think wheather i use socket or there is any other way

I Think It will Work
Alok Gupta
visit me at http://www.thisisalok.tk

Re: Help Wanted to display dlg box frm the Service

Antony M Kancidrowski12-Jun-04 3:47

Antony M Kancidrowski

12-Jun-04 3:47

There are various methods of interprocess communication(IPC). Named pipes, memory mapped files and other forms of shared memory.

If you search for IPC on codeproject you can't go far wrong reading about these. Smile | :)

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fuity and sweet.
I'm jelly, what am I? - David Williams (Little Britain)

Re: Help Wanted to display dlg box frm the Service

David Crow15-Jun-04 2:13

David Crow

15-Jun-04 2:13

Alok the programmer wrote:
how a Gui application interact with service,have you any idea.

This is what a Service Control Program (SCP) is for. It's how the actual service is configured.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Help Wanted to display dlg box frm the Service

suiram4011-Jun-04 7:43

suiram40

11-Jun-04 7:43

#ifdef _WIN32_WINNT
#if (_WIN32_WINNT >= 0x0400)
#define MB_SERVICE_NOTIFICATION 0x00200000L
#else
#define MB_SERVICE_NOTIFICATION 0x00040000L
#endif
#define MB_SERVICE_NOTIFICATION_NT3X 0x00040000L
#endif
MessageBox(...,MB_SERVICE_NOTIFICATION)

Re: Help Wanted to display dlg box frm the Service

ThatsAlok11-Jun-04 23:48

ThatsAlok

11-Jun-04 23:48

what is that sir.
i want to show dlg box
your above code is also not working

I Think It will Work
Alok Gupta
visit me at http://www.thisisalok.tk

Passing window to a different process?

IGx8911-Jun-04 4:50

IGx89

11-Jun-04 4:50

I have two programs, and I need to have a special window open whenever one or both of them are loaded. It's working pretty well, but I've run across a problem: if I load program 1, then program 2, then close P2, then close P1, it works fine (the window isn't destroyed until the last program exits), but if I load P1, then P2, then close P1, the special window is destroyed (because P1 was the program that spawned it). Is there any way to pass the special window from P1 to P2, so closing P1 doesn't close the that window? I can't just recreate the special window, because then it loses its position on the taskbar (moves to the end of the list of open programs).

Thanks!

Re: Passing window to a different process?

David Crow11-Jun-04 5:16

David Crow

11-Jun-04 5:16

When P1 starts, check for the existance of the special window and create it if necessary. Save the window handle for later. When P2 starts, check for the existance of the special window and create it if necessary. Save the window handle for later. When P1 ends, if it has a valid window handle and P2 is not running, close the special window. When P2 ends, if it has a valid window handle and P1 is not running, close the special window. Will that work?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Passing window to a different process?

IGx8911-Jun-04 6:00

IGx89

11-Jun-04 6:00

That's exactly what I'm doing already. The problem occurs when closing P1 but P2 is still running: the special window is closed anyway (which appears unavoidable unless a separate process is used for the special window).

Re: Passing window to a different process?

David Crow11-Jun-04 6:12

David Crow

11-Jun-04 6:12

So are you saying that P1 is closing the special window without first checking to see if P2 is still running?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Passing window to a different process?

IGx8911-Jun-04 6:45

IGx89

11-Jun-04 6:45

No; let me show you some psuedo-code to illustrate:

P1_OnExit()<br />
{<br />
   if(!exists(P2))<br />
      close(specialwindow) //window is closed, like it should be<br />
}<br />
//P1 closes<br />
//The special window is closed, even if P2 still exists<br />

Re: Passing window to a different process?

David Crow11-Jun-04 7:17

David Crow

11-Jun-04 7:17

It looks as though the exists() function is not returning the correct status of P2.

On the other hand, I may be making an incorrect assumption about the "special window." Reading through the other replies to this post, I was assuming it was a separate process (since the word spawn) was used. If it is indeed just a window that is "owned" by P1, my posts are wrong.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Passing window to a different process?

palbano11-Jun-04 5:34

palbano

11-Jun-04 5:34

I don't believe a window can survive it's parent process. If that is true then you need the "special window" to be a separate process. Then i believe you can just make the special process a "single instance" process by using a mutex.

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: Passing window to a different process?

IGx8911-Jun-04 5:58

IGx89

11-Jun-04 5:58

If I did that, would the new process be visible to the user (listed in Task Manager)?

Re: Passing window to a different process?

jmkhael11-Jun-04 6:06

jmkhael

11-Jun-04 6:06

Yes
Why dont you simply *hide* P1 as if it was closed?

Another option is to inject the window into explorer.exe this way it wont die with P1.
Check CreateRemoteThread

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Passing window to a different process?

IGx8911-Jun-04 6:41

IGx89

11-Jun-04 6:41

Well, P1 will be taking up at least 40mb, so that's not an option Smile | :)

Thanks, I'll check out that function.

Re: Passing window to a different process?

Anonymous11-Jun-04 6:44

Anonymous

11-Jun-04 6:44

sure is that a problem?

Re: Passing window to a different process?

IGx8911-Jun-04 6:47

IGx89

11-Jun-04 6:47

We're trying to avoid that, making it as clean as possible. But, if there's no decent way around it, then we might end up doing that after all.

Re: Passing window to a different process?

palbano11-Jun-04 7:02

palbano

11-Jun-04 7:02

Sorry that Anonymous post was me... i timed out, had to actually do some work Laugh | :laugh:

"Clean" is in the eye of the beholder. My first thought is that a Single Instance process for the special window would produce the "Simplest" solution. I always like simple. Of course I don't have the complete context of your problem so...

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: Passing window to a different process?

IGx8911-Jun-04 7:11

IGx89

11-Jun-04 7:11

Well, basically I'm trying to force two different programs to appear as one program on the taskbar, but two separate programs in the alt-tab window. I'm currently doing it by making the two programs not show up on the taskbar, and using a special window and the ITaskbarList interface to make an entry on the taskbar that doesn't show up in the alt-tab window.

Re: Passing window to a different process?

palbano11-Jun-04 7:43

palbano

11-Jun-04 7:43

Probably a stupid question, but... Why not just One process that looks like One process because it is One process? Big Grin | :-D

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: Passing window to a different process?

IGx8911-Jun-04 8:03

IGx89

11-Jun-04 8:03

Both apps are way too big to combine them both, that's why Smile | :)

Re: Passing window to a different process?

Joel Lucsy12-Jun-04 14:18

Joel Lucsy

12-Jun-04 14:18

Is that "Too big" as in the projects are too big, or in the process memory is too big?
If it's the later, then I wouldn't consider that an issue as both programs will have to be in memory regardless. In fact, it may be slightly less memory as there is no overhead for the second process (not mention code being used for communication).
If it's the former, then you may want to break up the application into dlls that are more easily managed.

--
Joel Lucsy

Re: Passing window to a different process?

IGx8912-Jun-04 15:23

IGx89

12-Jun-04 15:23

I mean the former; it would be a complete nightmare to combine them, and definitely not worth it.

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