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Hi,
If I have thread that never enters a message loop and never creates Windows,
can this thread make calls to other USER or GDI functions,
or will the message queue eventually be full and Windows show some strange behavior?
Thanks a lot ...
Daniel
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That thread can call some User functions like SendMessage() that operate on other windows. Keep in mind that every such call will necessitate a context switch to the thread that owns the window, and then another switch back. If you send a lot of messages this way, you may see an impact on perf.
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Thanks!
But how about functions like RegisterClassEx() or MoveWindow() or TextOut()? I have tried it out: You can create windows with classes registered by other threads and you can also move windows and write upon windows that were created by other threads. However I don't know
a) if functions such as MoveWindow() internally switch threads (performance penalty) and,
b) if eventually the message queue of the walker thread would flow over.
The MSDN Library from April 2005 states in its chapter about Messages and Message Queues:
"The system maintains a single system message queue and one thread-specific message queue for each graphical user interface (GUI) thread. To avoid the overhead of creating a message queue for non–GUI threads, all threads are created initially without a message queue. The system creates a thread-specific message queue only when the thread makes its first call to one of the User or Windows Graphics Device Interface (GDI) functions. "
...
"The system automatically creates a message queue for each thread. If the thread creates one or more windows, a message loop must be provided; this message loop retrieves messages from the thread's message queue and dispatches them to the appropriate window procedures. "
This sounds to me as if message loops are only necessary for threads that create windows. However, I am not sure and it would be better to be sure ...
Any idea?
Thanks,
Daniel
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You can do GDI operations from a different thread, however as I said that is not the optimal way to do things since it will result in context switches. The messages for a window can only be processed by the thread that owns the window.
schwadan wrote: This sounds to me as if message loops are only necessary for threads that create windows.
That is correct.
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I Wan't use Security and sharing, without enabled Simple filesharing. But if is disabled, when from other computer on lan tries to connect to mine, it require password. How to remove it?
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The reason that its ask your password because the remote computer that want to connect to the share resource does not have the same user account or the password is difference from the computer that share the resource.
Try to check this document[^] and it might help you to solve this problem.
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ok i got two other partitions on my computer, d: and e:
if i do this: run > cmd
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Wolf>cd d:\
C:\Documents and Settings\Wolf>cd e:\
C:\Documents and Settings\Wolf>cd c:\
C:\>cd c:\windows
C:\WINDOWS>
as you can see its only working with stuff on c:\... and this is annoying me cause i can't do anything so what do i do to fix?
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Fix what? They worked perfectly.
In order to change the current drive you do this:
C:\Documents and Settings\Wolf>D:
D:\>_
-- modified at 20:55 Sunday 10th December, 2006
Dave Kreskowiak
Microsoft MVP - Visual Basic
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cd doesn't work across drives, you need to change the current drive first.
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Type just the drive name:
C:\> D:<br />
D:\> cd mystuff<br />
D:\mystuff> _
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thx that works. i'm suprissed that C:\cd d:\mystuff doesnt work. I totally missed that you were showing me this in your first post lol.
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FocusedWolf wrote: i'm suprissed that C:\cd d:\mystuff
It works, just not the way you think it should.
C:\cd d:\mystuff<br />
C:\D:<br />
D:\mystuff {Your now in the d:\mystuff directory}
CD has worked this way for ever, well at least as long as I remember.
I'd love to help, but unfortunatley I have prior commitments monitoring the length of my grass. :Andrew Bleakley:
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Hi,
When I log into Windowes XP and click on my user icon, just before typing my password I see a small message just above the textbox that usually says "You have X unread emails"
Where on earth does Windows get this from? It certainly bears no relation to any email account I'm aware of...
Not important, just wondered...
cheers
F
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Do u use any MSN messenger, if u use it, then the most recently used ID for logging in to MSN Messenger gets mapped to the logged in windows user,
chk it out..
regards,
Karam C Bose
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Thanks.. I do you MSM but never noticed it relating to any missed messeges on that - perhaps it is in relation to my never used OE...
Anyway, like I said, it's mot important.. just one of those little irksomwe things that makes you wish Windows wouldn't always try to be so clever... (not that I should talk...)
cheers, F
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Hi!
I have a restricted user under Windows XP and i would like to grant him permissions to manage web sites in his own machine using IIS 5.1. I don't want to add him to the power users or administrators group, just grant him permissions on IIS even if i have to create a new group such as Web Operator or something like that.
Does anyone knows how can i do this?
Thanks,
vSoares
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In my opinion, you should try to check group policies in your windows xp whether it has any policies relate to your need and grand his user account in that policies.
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Can I change skin of WinXP into black and white
"My advice to you is to get married. If you find a good wife, you will be happy; if not, you will become a philosopher." Socrates
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You would have to use a custom Theme file. See: Vista Styles
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Try to see the appearance tab of Desktop property.
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Hi
How do I creat a user account called "everyone" and set permisions to full control, under program control.
I need to change my web.config security settings for a user dynamically
regards
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Hallo,
wie kann man die UDP-Checksum Überprüfung unter Windows (oder für einen Port) abstellen?
Danke.
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