Visual Basic

Re: How to use a an environment variable as argument to an program using shell command in VB.net 2005?

4-Jun-09 4:51

thanks Now i Figured it out. Smile | :)

Dave Kreskowiak3-Jun-09 5:47

Dave Kreskowiak

3-Jun-09 5:47

The Shell statement is deprectated and is only there for backward compatibility of upgraded VB6 code. Use the Process class instead.

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2006, 2007, 2008

Re: How to use a an environment variable as argument to an program using shell command in VB.net 2005?

Striker.dbz3-Jun-09 5:52

Re: How to use a an environment variable as argument to an program using shell command in VB.net 2005?

3-Jun-09 5:52

Do you mean diagnostics.process.start ?
But that doesn't wait for process to finish.

Luc Pattyn3-Jun-09 7:36

Luc Pattyn

3-Jun-09 7:36

Striker.dbz wrote:
that doesn't wait for process to finish

That must have been an excellent reason for coming up with an entire class; lots of useful methods are available.

Smile | :)

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Re: How to use a an environment variable as argument to an program using shell command in VB.net 2005?

Dave Kreskowiak3-Jun-09 12:35

Dave Kreskowiak

3-Jun-09 12:35

Did you bother to read the documentation on the Process class or even look through the Intellisense list after you typed Process.?? Maybe that WaitForExit method might be useful for something...

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Re: How to use a an environment variable as argument to an program using shell command in VB.net 2005? [modified]

Striker.dbz3-Jun-09 20:50

Re: How to use a an environment variable as argument to an program using shell command in VB.net 2005?

3-Jun-09 20:50

Can you please elaborate i am very new to programming?

Thanks.

modified on Thursday, June 4, 2009 3:03 AM

0x3c03-Jun-09 21:45

Re: How to use a an environment variable as argument to an program using shell command in VB.net 2005?

3-Jun-09 21:45

Process.Start just starts a process; just as Shell does. However, it returns a Process instance. If you call WaitForExit on this Process instance, your main application's thread will block until the process closes

Between the idea
And the reality
Between the motion
And the act
Falls the Shadow

Striker.dbz3-Jun-09 21:58

Re: How to use a an environment variable as argument to an program using shell command in VB.net 2005?

3-Jun-09 21:58

Is it something like this

dim x as an integer
x = Process.start("program.exe")
call Waitforexit(x)

Please reply asap.

0x3c03-Jun-09 22:09

Re: How to use a an environment variable as argument to an program using shell command in VB.net 2005?

3-Jun-09 22:09

No, something like this:

Dim p As Process = Process.Start(...)

p.WaitForExit()

You can also pass an additional parameter to WaitForExit which specifies a timeout period - useful if your application is waiting for a process to finish, but cannot finish for some reason

Between the idea
And the reality
Between the motion
And the act
Falls the Shadow

Striker.dbz3-Jun-09 22:37

Re: How to use a an environment variable as argument to an program using shell command in VB.net 2005?

3-Jun-09 22:37

Thanks.

Now i have another problem.sorry.

I have delete a file in a directory
but only if the file exists
i am trying to use mycomputer.getfiles.method but don't no how to do it.

Please reply.

0x3c03-Jun-09 22:45

Re: How to use a an environment variable as argument to an program using shell command in VB.net 2005?

3-Jun-09 22:45

If(File.Exists("FilePath"))<br />
    File.Delete("FilePath")<br />
End If

You may want to look into the System.IO namespace - in particular the File, Path, Directory, DriveInfo, FileInfo and DirectoryInfo classes

Between the idea
And the reality
Between the motion
And the act
Falls the Shadow

Striker.dbz3-Jun-09 22:57

Re: How to use a an environment variable as argument to an program using shell command in VB.net 2005?

3-Jun-09 22:57

it says file isn't declared.

Help!

0x3c03-Jun-09 23:24

Re: How to use a an environment variable as argument to an program using shell command in VB.net 2005?

3-Jun-09 23:24

You may want to make a new topic for completely unrelated topics. And chances are that you need to add an Imports System.IO at the top of your code file

Between the idea
And the reality
Between the motion
And the act
Falls the Shadow

Striker.dbz4-Jun-09 0:47

how to use a downloaded C# sourcefile in a vb.net 2008 project?

4-Jun-09 0:47

ya i got it now

All problems solved.

Thanks so much to every one for helping me.

aeroaster3-Jun-09 4:43

aeroaster

3-Jun-09 4:43

i have got a source code file (classlibrar style), which has successfully been impiled to a DLL file.
so how can i load this dll file in my .net vb project? i want details ,thank you!

Re: how to use a downloaded C# sourcefile in a vb.net 2008 project?

Kschuler3-Jun-09 4:56

Kschuler

3-Jun-09 4:56

1. Add the file to your project:
In the solution explorer,
right Click on your project,
select add --> existing item.
Find the dll file and add it.

2. Add a reference to the dll
in the solution explorer,
double click on My Project,
select the references tab.
click add.
select the browse tab
Find the dll file and click ok

Re: how to use a downloaded C# sourcefile in a vb.net 2008 project?

aeroaster3-Jun-09 16:00

aeroaster

3-Jun-09 16:00

Thank you,i got it.but how can i declare function to use a function in DLL ?

Re: how to use a downloaded C# sourcefile in a vb.net 2008 project?

Kschuler4-Jun-09 2:52

Kschuler

4-Jun-09 2:52

Once the dll has been referenced, you need to create an instance of it and then you can call any exposed methods or functions it conatins. For example, if your DLL is named MyLibrary and has a function called MyFunction that takes two string parameters. This is how you would call it and use it:

Dim objLib as New MyLibrary<br />
Dim str as String<br />
str = objLib.MyFunction("Hello", "World")

deleteing from database

chrispowell123453-Jun-09 4:26

chrispowell12345

3-Jun-09 4:26

Hi guys,

I'm working in VBexpress2008 using the sql server compact that comes with it. I'm trying to delete a row from a listbox out of a table using this code:

Private Sub Deleteip_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Deleteip.Click
DataSet.IP.Rows(IPlistbox.SelectedIndex).Delete()
DataSet.IP.AcceptChanges()
IPTableAdapter.Update(DataSet.IP)
End Sub

it all seems to work fine, deleteing it from the dataset, no errors when running the tableadapter.update but when i go back into it they are there again!

any suggestions would be appreciated, thanks

Chris

riced3-Jun-09 4:55

riced

3-Jun-09 4:55

A possible answer might be that when you re-run the code it is copying the database from the original into the bin\debug folder.
This happens when you run in debug so that the testing does not trash the original database.

Regards
David R
---------------------------------------------------------------
"Every program eventually becomes rococo, and then rubble." - Alan Perlis

Jon_Boy3-Jun-09 5:01

Jon_Boy

3-Jun-09 5:01

Does your table adapter have a delete statement defined within the dataset?

"There's no such thing as a stupid question, only stupid people." - Mr. Garrison

Dave Kreskowiak3-Jun-09 5:45

Dave Kreskowiak

3-Jun-09 5:45

The problem is that you called AcceptChanges before you called Update. This tells the DataSet that the modifications that it is holding should now be considered synced up with the database. now that you've essentially wiped out all the changes, when you call Upgdate, the DataAdpater doesn't see any changes to make to the backing database, so nothing changes. When you go run your code again, you see the database exactly how it was when you ran it the last time.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Jon_Boy3-Jun-09 6:27

Jon_Boy

3-Jun-09 6:27

doh! Yuppers!

"There's no such thing as a stupid question, only stupid people." - Mr. Garrison