Visual Basic Discussion Boards

Re: SaveFileDialog.ShowDialog() return value

Eddy Vluggen9-Apr-13 9:36

9-Apr-13 9:36

The "ShowDialog" method is blocking; it will halt the execution of the current thread until the dialog is dismissed by the user. You're checking whether the result of that method equals the enumerated value "DialogResult.OK".

Bastard Programmer from Hell Suspicious | :suss:

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

Re: SaveFileDialog.ShowDialog() return value

econy9-Apr-13 9:39

econy

9-Apr-13 9:39

I mean if user input nothing in the dialog, then user press save, it will not return.

Is that showdialog() ask user must input something?

Re: SaveFileDialog.ShowDialog() return value

Eddy Vluggen9-Apr-13 9:59

Eddy Vluggen

9-Apr-13 9:59

econy wrote:
I mean if user input nothing in the dialog, then user press save, it will not return.

It'll return, but with a different value.

econy wrote:
Is that showdialog() ask user must input something?

Yup, with various options[^] to influence it's behaviour.

Bastard Programmer from Hell Suspicious | :suss:

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

Re: SaveFileDialog.ShowDialog() return value

Johnny J.17-Apr-13 1:40

Johnny J.

17-Apr-13 1:40

Eddy Vluggen wrote:
econy wrote:
I mean if user input nothing in the dialog, then user press save, it will not return.

It'll return, but with a different value.

Nope, not so, please see Richards answer, which is correct to my knowledge

Why can't I be applicable like John? - Me, April 2011
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Re: SaveFileDialog.ShowDialog() return value

Eddy Vluggen17-Apr-13 1:53

Eddy Vluggen

17-Apr-13 1:53

I did, a few weeks ago. Didn't update this answer, as his problem is already solved.

Simply downvote the answer if you don't like it Smile | :)

Bastard Programmer from Hell Suspicious | :suss:

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

Re: SaveFileDialog.ShowDialog() return value

Johnny J.17-Apr-13 1:54

Johnny J.

17-Apr-13 1:54

No need for that, I was just passing by and felt the need to butt in... Wink | ;)

Re: SaveFileDialog.ShowDialog() return value

Richard MacCutchan9-Apr-13 9:46

Richard MacCutchan

9-Apr-13 9:46

You cannot use OK without a filename, you must use Cancel.

Use the best guess

Re: SaveFileDialog.ShowDialog() return value

econy9-Apr-13 15:22

econy

9-Apr-13 15:22

Yes, that was I encountered. shodialog() seems that user must input a file name and then click OK, otherwise, user can only click cancel

What is the function of Filedialog.RestoreDirectory

econy9-Apr-13 6:46

econy

9-Apr-13 6:46

In MSDN forum, it explains that:
the RestoreDirectory property to ensure that the current directory is restored when the dialog box is closed.

But I tried the example code, I can't find the difference between
RestoreDirectory = true or RestoreDirectory = false.

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

       Dim myStream As Stream = Nothing
       Dim openFileDialog1 As New OpenFileDialog()

       openFileDialog1.InitialDirectory = "c:\"
       openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"
       openFileDialog1.FilterIndex = 2
       openFileDialog1.RestoreDirectory = False

       If openFileDialog1.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
           Try
               myStream = openFileDialog1.OpenFile()
               If (myStream IsNot Nothing) Then
                   ' Insert code to read the stream here.
               End If
           Catch Ex As Exception
               MessageBox.Show("Cannot read file from disk. Original error: " & Ex.Message)
           Finally
               ' Check this again, since we need to make sure we didn't throw an exception on open.
               If (myStream IsNot Nothing) Then
                   myStream.Close()
               End If
           End Try
       End If
   End Sub

Re: What is the function of Filedialog.RestoreDirectory

Richard MacCutchan9-Apr-13 6:59

Richard MacCutchan

9-Apr-13 6:59

The documentation[^] could be worded better. However, I think the issue is that the OpenFileDialog by default remembers the last directory navigated to. If RestoreDirectory is set to true then it restores the previous saved directory. This should be easy to confirm with a test.

Use the best guess

Re: What is the function of Filedialog.RestoreDirectory

econy9-Apr-13 7:05

econy

9-Apr-13 7:05

Yes, it only reopen the last directory navigated to, whether the ResotreDirectory is set to true or false.

Don't know what the RestoreDirecotry property can do.

Re: What is the function of Filedialog.RestoreDirectory

Richard MacCutchan9-Apr-13 7:23

Richard MacCutchan

9-Apr-13 7:23

You are right; I just tried it and cannot see any difference.

Use the best guess

Re: What is the function of Filedialog.RestoreDirectory

Kenneth Haugland9-Apr-13 8:18

Kenneth Haugland

9-Apr-13 8:18

You could file the bug/issue here:
http://connect.microsoft.com/[^]

Re: What is the function of Filedialog.RestoreDirectory

Dave Kreskowiak9-Apr-13 11:36

Dave Kreskowiak

9-Apr-13 11:36

I don't think that's entirely true.

I think the FileDialogs change the CurrentDirectory when you navigate around the directory tree. They don't remember the last directory navigated to, but rely on the CurrentDirectory to supply it. When you set RestoreDirectory to true, the CurrentDirectory is reset back to what it was when the dialog was Shown.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: What is the function of Filedialog.RestoreDirectory

Richard MacCutchan9-Apr-13 11:47

Richard MacCutchan

9-Apr-13 11:47

Thanks, I'll look at this more closely some time.

Use the best guess

Re: What is the function of Filedialog.RestoreDirectory

Alan N9-Apr-13 9:43

Alan N

9-Apr-13 9:43

It's all a bit confusing as RestoreDirectory does not affect the file dialog's initial directory. What RestoreDirectory is restoring is the program's current directory as reported by Environment.CurrentDirectory. If RestoreDirectory is true then Environment.CurrentDirectory is not affected by any browsing undertaken within the file dialogs.

As for the directory where the file dialog opens that depends.
If InitialDirectory is not set then the directory stored in the LastVisitedMRU registry key is used or if that directory is not available then it's the current directory.

For Windows XP LastVisitedMRU is at HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\ComDlg32\LastVisitedMRU where per application settings are stored. The registry key values contain a pair of null terminated Unicode strings, the first being the application name and the second the last visited directory.

Alan.

Re: What is the function of Filedialog.RestoreDirectory

Richard MacCutchan9-Apr-13 22:32

Richard MacCutchan

9-Apr-13 22:32

I have run some further tests and cannot find any effect from this setting. I have also reported it to Microsoft.

Use the best guess

How to check if one button is active [ solved ]

econy9-Apr-13 5:30

econy

9-Apr-13 5:30

My application is when a user click Read button, then I got one record of data,then I store it in a file.

when a user click Read Continuous button, then I got one record every 200 ms (use timer control), then I should store the record every 200 ms.

Now I plan to add a Record button, the user click it, it will read the status of Read/Read continuous button, then start the saveing task.

Other way to do that, maybe I can use a varialbe = Record button's state. then In read/read continue button event handler, use the record button state to activate/deactivate recording task.

modified 9-Apr-13 21:25pm.

Re: How to check if one button is active

Dave Kreskowiak9-Apr-13 11:39

Dave Kreskowiak

9-Apr-13 11:39

Don't do this. DOn't rely on the states of controls to control the state of your application. Maintain the state in your own structures seperate from what controls are telling you. This way, you have better control over what's going on in your application without having to deal with the side-effects of control values. For example, checking Control.Visible will change depending on if the user can actually see the control. It may change if the user drags another window over the top of the control in question.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: How to check if one button is active

econy9-Apr-13 15:24

econy

9-Apr-13 15:24

Thanks

econy9-Apr-13 3:59

econy

9-Apr-13 3:59

Hi, I want to implement a funciton on a button, like:
click 1, text="aaa";
click 2, text="bbb";
click 3, text="aaa" = click 1;
click 4, text="bbb" = click 2;

that is, the text would flip-flop with the clicking action.

Now I thought a method that I can do this with a variable to represent the status of the button.

Is there other way to do that flip-flop button function?

modified 9-Apr-13 10:53am.

Re: Button text related to click event

Kenneth Haugland9-Apr-13 4:26

Kenneth Haugland

9-Apr-13 4:26

It depends, there is a click count the Number of clicks:
http://msdn.microsoft.com/en-us/library/system.windows.input.mousebuttoneventargs.clickcount.aspx[^]

If you on the other hand wnat a different color on each type of cliks then you must impolement something lik

Dim NoOfCLicks as Ingeter = 0

btnClicking( ... ) handles btnClicking.Click
NoOfClicks += 1

if NoOfClicks /4 = 0 then

elseif NoOfClicks / 4 = 0.5 then

elseif NoOfClicks / 4 = 0.8 then

else

end if

Re: Button text related to click event

econy9-Apr-13 5:06

econy

9-Apr-13 5:06

Thanks, could you give me a simple example on how to use the "OnMouseDownClickCount", and "MouseButtonDownHandler"?

I added a button in a form, just want to test these 2 handler, but don't know how can I connect these 2 event handler with a control.

Thanks

Re: Button text related to click event

David Mujica9-Apr-13 4:26

David Mujica

9-Apr-13 4:26

Yes, you are right.

Declare the variable at the "Form" level and you will be able to manipulate the text of the button.

You could do this with a boolean.

Dim butClicked as boolean = False

Inside your button click event.

If (butClicked) then
set text to aaa
else
set text to bbb

butClicked = Not butClicked

Time in and time out windows form in vb.net

NOORULLA KHAN8-Apr-13 23:16

NOORULLA KHAN

8-Apr-13 23:16

Hi developers .I have some problem in my project which is on employee timein and timeout.when an employee login in the morning my timein button should accept the timein and add it to the database(ms access).when an employee wants to logout in the evening the timein and timeout form should validate the timein field in the database if timein field contains the login time then form button should active as timeout ,but it is not validating in my project so kindly can anyone help me.so here is my code..:

SQL

Dim CN As New OleDbConnection(cnString)

        CN.Open()
once if the employee login by its e-id and password it shows the e-name,inthe another textbox.so to select the ename i have coded below.

 com2 = New OleDbCommand("SELECT  ename from Images WHERE eid ='" & txtemid.Text & "'  ", CN)
            dr = com2.ExecuteReader
            While dr.Read
                txtename.Text = dr(0)


                'Please below given line is to extarct the only current time except date
                txttime.Text = Now.ToShortTimeString








"Now here it is validating for timeout "
        com3 = New OleDbCommand("Select * from logtime where eid='" & txtemid.Text & "' and timein<>null and timeout=null and present=null ", CN)
        dr1 = com3.ExecuteReader

        If dr1.Read Then
            Button1.Text = "Time Out"
            txttimeout.Text = Now.ToShortTimeString
            Exit Sub
        Else


        End If

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