Access Key - Visual Basic Discussion Boards

Re: Timer problem

Luc Pattyn17-Oct-07 22:40

Luc Pattyn

17-Oct-07 22:40

Hi, you could find more information on this subject in my timer article. See link below.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
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Error "Object reference not set to an instance of an object"

Dan Suthar17-Oct-07 21:31

Dan Suthar

17-Oct-07 21:31

Hi,
I am just tired getting this error "Object reference not set to an instance of an object" in my project. I know that to solve this error you can use New keyword but I don't think that "new" can be used with Thread. Some code is as follows:

Private thrDownload As Thread

<br />
'''''' Some code is here'''''''''''''<br />
'<br />
'<br />
'<br />
'Now On This line I am getting an error :<br />
<br />
thrDownload.Start(0)<br />
<br />
' Or On thrDownload.Pause(0) & thrDownload.Stop(0) the same error !<br />
'<br />
'<br />
'<br />
'<br />
'''''' Some code is here'''''''''''''<br />
<br />

If anyone wants then I can paste the whole code here but It's lots of lines of code ! :->

Any Suggestions ? D'Oh! | :doh:

Thanks,
Dan

Re: Error "Object reference not set to an instance of an object"

Guffa17-Oct-07 21:47

Guffa

17-Oct-07 21:47

Dan`M wrote:
I know that to solve this error you can use New keyword but I don't think that "new" can be used with Thread.

Yes, it can. You have to create the Thread object before you can use it.

---
"Anything that is in the world when you're born is normal and ordinary and is just a natural part of the way the world works. Anything that's invented between when you're fifteen and thirty-five is new and exciting and revolutionary and you can probably get a career in it. Anything invented after you're thirty-five is against the natural order of things."
-- Douglas Adams

Re: Error "Object reference not set to an instance of an object"

Dan Suthar17-Oct-07 21:52

Dan Suthar

17-Oct-07 21:52

sorry but can you show some example code please.. :->

Filter your datagrid through text in a combobox/textbox

blonkie17-Oct-07 21:27

blonkie

17-Oct-07 21:27

Yo,

I have an datagrid where I want to filter my data I got.
The filter I want to use is the text inside an combobox or textbox (it doesn't matter)

This is the code I already have

Private Sub cmbPO_textChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmbPO.SelectedValueChanged
Me.TblLijstBindingSource.Position = Me.cmbPO.SelectedIndex
End Sub

Where:
cmbPO = combobox
tblLijstBindingSource = binding source

This doesn't works like I want it, I want to see just the record I've insert in the combobox. But if this is to hard to do, it may just jump to that record.

Thanks

(Plz keep in VB.NET and do not throw code of C# or such a languages :->)

Re: Filter your datagrid through text in a combobox/textbox

C1AllenS18-Oct-07 2:04

C1AllenS

18-Oct-07 2:04

Hello,

To achieve this, you would have to use the filter property for the binding source. You will have
to specifically put the filter condition on the field whose value you will enter in the Text box.

You can use the following code in the TextChanged event of the Combobox or the Text Box:

Private Sub ComboBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox1.TextChanged<br />
<br />
        Me.TblLijstBindingSource.Filter = "<Column Name> ='" & Me.ComboBox1.Text & "'"<br />
<br />
End Sub

I believe this should help.

Regards,
Allen

Allen Smith

Software Engineer
ComponentOne LLC
www.componentone.com

Re: Filter your datagrid through text in a combobox/textbox

blonkie18-Oct-07 3:04

blonkie

18-Oct-07 3:04

Thanks for your help but still got an error :

Syntax error: Missing operand before '=' operator.

Btw how do you search for a value who is in a datagrid who is dynamic created.
I mean how can you bind a dataset to the datagrid, and not the datagrid to the dataset.

Thanks

Access Key

brams717-Oct-07 15:37

brams7

17-Oct-07 15:37

Hi All,
This is the first time, am posting a query on any forum.
I've developed an application in which there is a hot key assigned to each button. In VB.Net I came to know there is no need to press Alt to activate the hot key which is known as an Access key (correct me if am wrong). But problem is like this when my application is open and control is on my application and by mistake if I pressed any button for eg. on Exit button, I've written E&xit so it's a hot key when I pressed Alt+x, but according to Access key if I press 'x' then also it works as Alt+x and it takes me out of the application. So I wanted to deactivate the access key, it should work only when I pressed Alt+x.

Please advice me.

Re: Access Key

Abhijit Jana17-Oct-07 20:05

Abhijit Jana

17-Oct-07 20:05

Hi,
This will clear your doubts !!!! Smile | :)

http://www.thescripts.com/forum/thread226312.html[^]

Good luck Rose | [Rose]

Happy Programming
-----
Abhijit

load assembly from appdomain?

cstrader23217-Oct-07 11:41

cstrader232

17-Oct-07 11:41

Sorry to be a pain, but I just can’t find this:

I can load an assembly from a .dll:
Dim Asm As Assembly = System.Reflection.Assembly.LoadFrom("c:\test.dll”)

But then I can’t unload the assembly

So I tried:

Dim newDomainName As AppDomain = AppDomain.CreateDomain("newDomainName")

But NewDomainName doesn’t have a loadfrom method

How to create the assemblyref foo required as the argument in:

newDomainName.Load(foo)

Thanks

Inserting a new row programatically in a bound datgridview

Mr Oizo17-Oct-07 11:33

Mr Oizo

17-Oct-07 11:33

hi well the title is pretty self explanotary.....I'm just trying to insert a row after the currently selected row in a datagridview programatically? anybody please help with this

Mr Oizo

Re: Inserting a new row programatically in a bound datgridview

Dave Kreskowiak17-Oct-07 15:28

Dave Kreskowiak

17-Oct-07 15:28

If the grid is bound to a datasource, you don't add the new row to the datagridview. You add it to the datasource, probably a DataTable. How you do that depends entirely on your datasource.

A guide to posting questions on CodeProject[^]

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

Sending Email without using Outlook

yogesh_kumar_agarwal17-Oct-07 8:22

yogesh_kumar_agarwal

17-Oct-07 8:22

Hi all i want to send the Email using VB6 but without using the Outlook Application how could i do that plz reply with code.

with regards

yogesh agarwal

Re: Sending Email without using Outlook

nlarson1117-Oct-07 8:59

nlarson11

17-Oct-07 8:59

look up either cdonts or cdosys dlls

Re: Sending Email without using Outlook

yogesh_kumar_agarwal17-Oct-07 10:34

yogesh_kumar_agarwal

17-Oct-07 10:34

Thanks for your reply but i tried a lot i could n't find the method how to use these DLL in my VB program to send the email could you help me out.

with regards

yogesh agarwal

Re: Sending Email without using Outlook

svanwass18-Oct-07 9:04

svanwass

18-Oct-07 9:04

Keep digging....

CDOSYS.dll
http://support.microsoft.com/kb/310212

CDONTS.dll
http://www.2enetworx.com/dev/projects/view.asp?ids=1,67,2

Re: Sending Email without using Outlook

GuyThiebaut17-Oct-07 9:03

GuyThiebaut

17-Oct-07 9:03

Check out Blat.

This is a freeware mail program that is command line driven - so you should be able to quite easily integrate it into your code.

I use this to automatically send out emails to suppliers notifying them of payment transfers.

You always pass failure on the way to success.

Re: Sending Email without using Outlook

yogesh_kumar_agarwal17-Oct-07 10:35

yogesh_kumar_agarwal

17-Oct-07 10:35

Thanks for your reply but i tried a lot i could n't find the method how to use the BLAT in my VB program to send the email could you help me out.

with regards

yogesh agarwal

Re: Sending Email without using Outlook

GuyThiebaut17-Oct-07 23:03

GuyThiebaut

17-Oct-07 23:03

I'm okay helping you with specific questions.

As a hint - you will need to use the shell to execute the blat commands as it is command line driven.

I don't consider just over one and a half hours, between my post and your reply, as worthy of the phrase:

yogesh_kumar_agarwal wrote:
tried a lot

.

Beyond this please be more specific with where you are stuck.

You always pass failure on the way to success.

Re: Sending Email without using Outlook

Christian Graus17-Oct-07 10:56

Christian Graus

17-Oct-07 10:56

If you were using VB.NET, this would be trivial. The other option that sprngs to mind is MAPI ( which can use outlook express, I belive ), but I have no idea if VB6 supports it in any way.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Can we read return from a process without waiting its completion?

ATC17-Oct-07 7:59

ATC

17-Oct-07 7:59

With the help of Pete (earlier post) I am able to read & display return lines then close a process through command line (MS-DOS window) with the following codes:

<br />
        Dim ps1 As New Process<br />
<br />
        ps1.StartInfo.FileName = "cmd.exe"<br />
        ps1.StartInfo.WindowStyle = ProcessWindowStyle.Normal<br />
        ps1.StartInfo.CreateNoWindow = False<br />
        ps1.StartInfo.UseShellExecute = False<br />
        ps1.StartInfo.RedirectStandardOutput = True<br />
        ps1.StartInfo.RedirectStandardInput = True<br />
        ps1.Start()<br />
<br />
        Dim s1 As String<br />
<br />
        Dim sIn As StreamWriter = ps1.StandardInput<br />
        Dim sOut As StreamReader = ps1.StandardOutput<br />
        sIn.AutoFlush = True<br />
        sIn.Write("dir/p" & System.Environment.NewLine)<br />
<br />
        Thread.Sleep(100)<br />
        s1 = sOut.ReadLine<br />
        ps1.Kill()<br />
<br />
        ListBox.Items.Clear()<br />
<br />
        '// *** Display every return line *** //<br />
        While s1 <> "End of Line"<br />
            ListBox.Items.Add(s1)<br />
            s1 = sOut.ReadLine<br />
        End While<br />
<br />
        ListBox.Items.Add(s1)<br />

However, if the process does not stop then the ListBox can not update data (I think because the process takes more priority then the ListBox?)

1. Can we modify the above codes so that we can update the ListBox without waiting the process completed?

2. If it is not possible ... is there another way to do it?

Thanks for any help! D'Oh! | :doh:

Re: Can we read return from a process without waiting its completion?

Dave Kreskowiak17-Oct-07 15:26

Dave Kreskowiak

17-Oct-07 15:26

ATC wrote:
Thread.Sleep(100)
s1 = sOut.ReadLine
ps1.Kill()

I love how you wait one tenth of a second, read a single line of it's output, and then kill the process, whether it's doing something or not. Then you continue and try and read lines from a process you already killed off. You cannot do that. The process object must stay running in order for you to read from it's output stream.

ATC wrote:
However, if the process does not stop then the ListBox can not update data

This is because the UI thread is running the code to read the output stream from the process. Until the read operation and filling of the ListBox is done and your code goes idle again, you're controls cannot repaint themselves because the thread is busy doing other things.

ATC wrote:
I think because the process takes more priority then the ListBox?)

Priority has nothing to do with it. Threading does.

ATC wrote:
1. Can we modify the above codes so that we can update the ListBox without waiting the process completed?

You cant read hasn't has been output, so no. You have to wait for the process to finish. If by this statement you mean that you want the control to repaint itself and continue to fill the ListBox with data, you either have to move the code that reads the output stream to another thread, or you have to read the output stream asynchronously.

A guide to posting questions on CodeProject[^]

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

Re: Can we read return from a process without waiting its completion?

ATC18-Oct-07 6:05

ATC

18-Oct-07 6:05

Hi Dave

Now I undestand more about my problem. I will try to do as you mentioned

Many thanks

Re: Can we read return from a process without waiting its completion?

svanwass18-Oct-07 9:09

svanwass

18-Oct-07 9:09

Would background workers fit in this solution? If not, why?

Re: Can we read return from a process without waiting its completion?

Dave Kreskowiak18-Oct-07 12:09

Dave Kreskowiak

18-Oct-07 12:09

Sure. BackgroundWorker is just a wrapper for a pool thread. It'll do the job just as easily.

A guide to posting questions on CodeProject[^]

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

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