Using Textbox.MaxLength - Visual Basic Discussion Boards

Dave Kreskowiak9-Jan-07 6:14

9-Jan-07 6:14

Let's see the code your using to launch this command line process and interact with it. Usually, something like this doesn't block your interface, unless your doing a WaitForExit on the Process object.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Re: multithreading [modified]

johnjsm9-Jan-07 22:06

johnjsm

9-Jan-07 22:06

Hi,
This is the code I am using to launch the command

Dim command As String
command = "C:\readcd dev=1,0,0 f=c:\johntest2.iso"
Shell(command, AppWinStyle.Hide)

I am also hoping to display a message when the command has finnished.

-- modified at 7:23 Wednesday 10th January, 2007

Re: multithreading

Dave Kreskowiak10-Jan-07 3:27

Dave Kreskowiak

10-Jan-07 3:27

Are you using VB.NET or VB6??

Dave Kreskowiak
Microsoft MVP - Visual Basic

Re: multithreading

johnjsm10-Jan-07 3:38

johnjsm

10-Jan-07 3:38

Sorry Dave. I am using VB.net 2003.

Re: multithreading

Dave Kreskowiak10-Jan-07 8:30

Dave Kreskowiak

10-Jan-07 8:30

OK. The code you posted is old VB6 stuff. But, in either case, Shell isn't a blocking call, so... There's something else that's hanging up your app. Is it possible that the app you launched is taking up 100% of the CPU??

Dave Kreskowiak
Microsoft MVP - Visual Basic

Re: multithreading

johnjsm10-Jan-07 21:56

johnjsm

10-Jan-07 21:56

Hi
The app probably would be using most of the cpu time. I came across the process.start which seems to help. Would this be the best thing to use.

Re: multithreading

Dave Kreskowiak11-Jan-07 2:59

Dave Kreskowiak

11-Jan-07 2:59

Yep. Launching a new process automatically give it it's own thread. It's not dependant on the threads of your app, so launching another thread won't help.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Using Textbox.MaxLength

dptalt9-Jan-07 4:22

dptalt

9-Jan-07 4:22

My textbox is bound to a datatable field. The field length is 50. I set the maxlength of the textbox to 50 also. When I run the form I cannot modify the textbox until I delete the trailing spaces. Can the trailing spaces automatically be removed so the user does not have to do it when modifing the textbox?

Re: Using Textbox.MaxLength

J4amieC9-Jan-07 5:08

J4amieC

9-Jan-07 5:08

.Trim()

---

How to get answers to your questions[^]

Re: Using Textbox.MaxLength

Colin Angus Mackay9-Jan-07 5:49

Colin Angus Mackay

9-Jan-07 5:49

dptalt wrote:
Can the trailing spaces automatically be removed so the user does not have to do it when modifing the textbox?

If you are able, you should tackle the root cause.

If you use a varchar in the database instead of a char then you won't get trailing spaces in the first place and you'll probably make more efficient use of your database.

In general you should only use char for interaction with legacy code that doesn't understand variable length columns or if you know that the data in the column will always be a fixed length.

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Re: Using Textbox.MaxLength

dptalt9-Jan-07 9:10

dptalt

9-Jan-07 9:10

Thanks!

Clickonce deployment

Sarah Jane Snow9-Jan-07 4:22

Sarah Jane Snow

9-Jan-07 4:22

Hi all,

Please help!

I have created a program which i am deploying with clickonce from a file share on our server,

it installed on 2 clients no problem, but on the third a got the error:

Unable to connect to the remote server
A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond

and on the forth machine a got the error:

Unable to connect to the remote server
No connection good be made because the target machine actively refused it

On the forth machine i copied the installation folder to the desktop and started it from there without any problem.

Any help would be greatly appriciated.

Many thanks in advance.

WAV file management

Amit D9-Jan-07 4:13

Amit D

9-Jan-07 4:13

Hello,

Can anyone please help me to write code (language: any .Net platform) to append text to a WAV file?

Thank you in anticipation.

Regards,
Amit

Re: WAV file management

Dave Kreskowiak9-Jan-07 5:00

Dave Kreskowiak

9-Jan-07 5:00

Why on earth would you want to do this? I can't think of a single good reason.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Re: WAV file management

Amit D9-Jan-07 5:30

Amit D

9-Jan-07 5:30

I need to send these amalgamated WAV files to a third party software which expects some demographics information at the end of each WAV file.

Thank you.

Re: WAV file management

Dave Kreskowiak9-Jan-07 6:11

Dave Kreskowiak

9-Jan-07 6:11

Amit D wrote:
which expects some demographics information at the end of each WAV file.

OK. There's an example of appending text to a file here[^].

Dave Kreskowiak
Microsoft MVP - Visual Basic

Re: WAV file management

Amit D9-Jan-07 6:52

Amit D

9-Jan-07 6:52

Thanks Dave for link but it wasnt helpful in this case as I know the basic file I/O all I need is to know how to write proper header information in the WAV file along with the proper byte count which includes the actual WAV file and newly appended text at the end.

Found this link: http://www.codeproject.com/useritems/Concatenation_Wave_Files.asp

But in this example the program amalgamates 2 WAV files as in my case its 1 WAV file + 1 text file = 1 WAV file with all information in it.

Many Thanks.
Amit D

Re: WAV file management

Dave Kreskowiak9-Jan-07 7:05

Dave Kreskowiak

9-Jan-07 7:05

Amit D wrote:
but it wasnt helpful in this case as I know the basic file I/O all I need is to know how to write proper header information in the WAV file along with the proper byte count which includes the actual WAV file and newly appended text at the end.

That's not what you originally asked.

Amit D wrote:
Found this link: http://www.codeproject.com/useritems/Concatenation_Wave_Files.asp

But in this example the program amalgamates 2 WAV files as in my case its 1 WAV file + 1 text file = 1 WAV file with all information in it.

That's about the only article I know of that demonstrates who to manipulate the headers of a WAV file.

Dave Kreskowiak
Microsoft MVP - Visual Basic

How to sniff tcp port in VB?

tezcatlipoca9-Jan-07 2:42

tezcatlipoca

9-Jan-07 2:42

hey can anyone help me by telling me any info regarding tcp port sniffing or monitoring...i want to monitor a certain port on my computer for incoming and outgoing data, how can i do that?

thanks
obi-wan

Re: How to sniff tcp port in VB?

Dave Kreskowiak9-Jan-07 5:03

Dave Kreskowiak

9-Jan-07 5:03

You'll need a 3rd party library just to get started. Something like WinPcap[^]. Get the latest Development Pack, under the Development tab on the left, and it'll come with the documentation for the library.

Dave Kreskowiak
Microsoft MVP - Visual Basic

database tables search in vb.net

amaneet9-Jan-07 1:23

amaneet

9-Jan-07 1:23

Sir/Madam,
Can I programically find out whether the particular table exist in the database or not.
Thanks abd Regards

Re: database tables search in vb.net

rama charan9-Jan-07 2:14

rama charan

9-Jan-07 2:14

i think u can try it by just using try-catch and query like

select * from tablename

if u end up in catch then u are sure table not present else table may be present.

i think this helps

enjoy..

Re: database tables search in vb.net

_mubashir9-Jan-07 2:25

_mubashir

9-Jan-07 2:25

Use the following query to get the list of all User tables in SQL Server connecting to a particular DB

select * from dbo.sysobjects where OBJECTPROPERTY(id, N'IsUserTable') = 1

Mubashir

Every job is a self portrait of the person who did it.

Re: database tables search in vb.net

Tim Carmichael9-Jan-07 2:33

Tim Carmichael

9-Jan-07 2:33

Yes, you can programmatically find out whether the table exists or not, but, you need to provide more details:
what type of database?
what type of table?

database tables search in vb.net

amaneet9-Jan-07 1:22

amaneet

9-Jan-07 1:22

Sir/Madam,
Can I programically find out whether the particular table exist in the database or not.
Thanks abd Regards

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