Visual Basic

Multithread question about VB.NET windows form application

19-Jun-13 8:58

Execute the "net view >computers.txt" command, and read the "computers.txt" file.

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econy18-Jun-13 6:01

Re: Multithread question about VB.NET windows form application

18-Jun-13 6:01

Is the VB.NET winform application multithread or single thread?

if I want to use threading.timer in a VB.NET application, do I need pay attention to the MTA, or STA?

Dave Kreskowiak18-Jun-13 7:26

Re: Multithread question about VB.NET windows form application

18-Jun-13 7:26

econy wrote:
Is the VB.NET winform application multithread or single thread?

Yes, VB.NET supports free threading.

econy wrote:
if I want to use threading.timer in a VB.NET application, do I need pay
attention to the MTA, or STA?

Doesn't matter unless you are doing/using something COM-related. What are you doing?

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econy19-Jun-13 14:50

The resolution of System.Timers.Timer

19-Jun-13 14:50

I want to use a thread to read data from serial port periodically

econy17-Jun-13 7:49

Re: The resolution of System.Timers.Timer

17-Jun-13 7:49

I wrote a small program, just want to test DateTime.Now and System.Timers.Timer.

I set Timer interval = 50/40, i.e 50ms/40ms

And in the timer elapsed event, call a StreamWriter.write() function,

tstText = "111" & Space(11) & Format(now, "hh:mm:ss.fff ")
mFileStreamWriter.Write(tstText)

But I found in the text file which stors the data, the timer resolution is 62-65 ms.

01:38:13.423 
01:38:13.485 
01:38:13.548 
01:38:13.610 
01:38:13.673 
01:38:13.735 
01:38:13.798 
01:38:13.860 
01:38:13.923

How can I make the resolution to 50ms, 40ms? or it is impossible to do it in Windows OS or any OS?

Dave Kreskowiak17-Jun-13 8:38

How to set StreamWriter object be null

17-Jun-13 8:38

Since Windows is not a real-time operating system, and is pre-emptive, and..., and..., getting dead on timer ticks just isn't possible. You can use various tricks to get better resolution, but even those have their limits. A few people have written articles about getting 1us resolution, but nobody has proven they work beyond any doubt.

Under Windows 7 and below, depending on the hardware, the default timer resolution is +/- 15.6ms. This means that a tick will be anywhere within about a ~32ms window of when it's actually supposed to be fired. You can change the resolution down to 1ms, but it's system-wide change that effects everything running on the system, not just your app. See this[^] for more info.

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econy17-Jun-13 4:10

Re: How to set StreamWriter object be null

17-Jun-13 4:10

After some operations, I want to set the StreamWrite object be NULL.

Now the code I wrote as follows:

mFileStreamWriter.Flush()
mFileStreamWriter.Close()
mFileStreamWriter = Nothing

But MSDN said is/isNot only used to compare the reference, not value.
So = Nothing means let an object refer to Nothing, right?

Dave Kreskowiak17-Jun-13 5:25

Show Opentype feature in VB.net

17-Jun-13 5:25

Nothing in VB.NET is null in other languages.

You don't have to set the streamwriter to Nothing. It does nothing for you at all.

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Use Dispose

David Mujica17-Jun-13 8:50

David Mujica

17-Jun-13 8:50

If you want to ensure that the resources are released, then you should "Dispose" of the StreamWriter.

http://msdn.microsoft.com/en-us/library/system.io.streamwriter.dispose.aspx[^]

Use Using

Richard Deeming17-Jun-13 9:09

Richard Deeming

17-Jun-13 9:09

If the StreamWriter is a local variable which never escapes the current method, wrap it in a Using ... End Using[^] block. This will ensure that the Dispose method is always called, even if your code throws an exception.

Using stream As Stream = File.OpenWrite("path\to\your\file.txt")
   Using sw As New StreamWriter(stream)
      ...
      ' NB: No need to call Flush or Close here.
   End Using
End Using

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Deeane16-Jun-13 23:51

Deeane

16-Jun-13 23:51

Hi all...

I have a questions about opentype font ...
whether we can show OpenType feature in vb.net?
and if it can where I can get a tutorial and script

Thank you for reply

best wishes,
dee

Eddy Vluggen17-Jun-13 0:28

17-Jun-13 0:28

Deeane wrote:
whether we can show OpenType feature in vb.net?

That's possible.

Deeane wrote:
and if it can where I can get a tutorial and script

CodeProject[^]. It's in C#, but the same applies to VB. If you're having trouble translating it to VB, post again here Smile | :)

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Deeane17-Jun-13 0:42

Deeane

17-Jun-13 0:42

Eddy Vluggen wrote:
It's in C#

Are you serious?
I am currently tried to make a software font preview and I really needed that script ...
can you give me a link or some tutorial of that??? video the best Smile | :)

i really need the script ...
thank you for reply Smile | :)

All the best!

Eddy Vluggen17-Jun-13 3:02

17-Jun-13 3:02

Deeane wrote:
Are you serious?

No, being friendly; otherwise I'd simply stated that you can link to the C# code from VB without translating. There's a joke-icon that is used to mark non-serious posts.

Deeane wrote:
i really need the script ...

I don't supply scripts, only free advice.

If you'll need help in translating it to VB, then I'm available. If you need someone to write you a script, then you'll have to wait for a good Samaritan.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Deeane17-Jun-13 17:45

Deeane

17-Jun-13 17:45

Eddy Vluggen wrote:
There's a joke-icon that is used to mark non-serious posts.

i apologize to write thats, I was just surprised because I've searched everywhere and have not received

Eddy Vluggen wrote:
I don't supply scripts, only free advice.

If you'll need help in translating it to VB, then I'm available. If you need someone to write you a script, then you'll have to wait for a good Samaritan.

i know this is maybe not free. actually i see this video http://www.youtube.com/watch?v=UhLi40eCfzU[^] and i try to write something at the richbox but opentype feature it's not active so i try to make script but i can't Frown | :(

. i just want to create a word mini just it. it's possible for you? how much should I pay for it?

Eddy Vluggen18-Jun-13 9:27

18-Jun-13 9:27

Deeane wrote:
i apologize to write thats, I was just surprised because I've searched everywhere and have not received

No problem.

Deeane wrote:
how much should I pay for it?

One can exchange ideas here, and consult each other. If you're looking to hire a coder, you'd want a site like http://www.rent-acoder.com/[^].

VB.NET is a friendly language. Take the source-files from the C#-project, throw them trough a converter like this one[^] and you'll have VB.NET code. If you don't yet have an IDE installed to write code, I'd recommend Visual Studio Express[^].

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

how change level?

Andrea Feduzzi11-Jun-13 21:02

Andrea Feduzzi

11-Jun-13 21:02

hi is it possible change the level of visualization of an shape (textbox, image, label ....)?
If I've two shapes in the same position and i wanted to see the shapes behind is possible change the priority of visualization?

ps the answer is ok for VB and C#

Richard MacCutchan11-Jun-13 21:41

Richard MacCutchan

11-Jun-13 21:41

Set the Visible property to False to hide a control, so the one underneath gets revealed.

Use the best guess

Bernhard Hiller11-Jun-13 23:08

Bernhard Hiller

11-Jun-13 23:08

The property to use is Opacity. See e.g. http://msdn.microsoft.com/en-us/library/fyby5ek5%28v=vs.80%29.aspx[^]

Dave Kreskowiak12-Jun-13 1:43

12-Jun-13 1:43

Opacity only works at the Form level, not controls.

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Dave Kreskowiak

Dave Kreskowiak12-Jun-13 1:44

12-Jun-13 1:44

Look into the Control.SendToBack[^] and Control.BringToFront[^] methods.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak