I'm having a problem with saving a setting to My Project and then exiting my program with an 'End' statement. If I save the setting but don't execute the end statement, everything works. If I save the setting and then execute the 'End', the setting doesn't get saved. Here's some code that illustrates the problem:
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'reads the last setting correctly
TextBox1.Text = My.Settings.MySetting
End Sub
Private Sub btnWrite_Click(sender As Object, e As EventArgs) Handles btnWrite.Click
'write value, don't exit; works
My.Settings.MySetting = TextBox1.Text
End Sub
Private Sub btnWriteEnd_Click(sender As Object, e As EventArgs) Handles btnWriteEnd.Click
'write value and end; fails
My.Settings.MySetting = TextBox1.Text
End
End Sub
End Class
When I execute the code, whatever was last in My.Settings.MySetting appears in TextBox1. If I change the text in the textbox and click on the 'Write' button and manually exit the program by clicking on the 'X', the new text appears properly changed when I execute the program again. If I change the text and exit programmatically by clicking on 'WriteEnd', the changed setting text doesn't get written to 'MySetting'.
What am I doing wrong?
Thanks
Settings will be saved automatically at shutdown by default, so there's generally no need to call Save. End is definitely the issue. NEVER use End. Call Close on the startup form or call Application.Exit. I compare End with a bouncer grabbing someone by the scruff of the neck and throwing them out, spilling their drink on everyone and leaving their jacket behind, rather than asking them to leave of their own accord.
Related
This is my first post here, so please don't judge me if I write something wrong ^^
Anyways, I've recently run into an issue with richtextboxes in Visual Basic .NET and WinForms.
Let's say I have a Main form and a Log form. The log form contains a richtextbox which functions as a log. From the main form I'm writing text to the log and I also format the lines, so they have different colors (blue for information, red for error).
Unfortunately, whenever I close and reopen the log form all text that has been written to it is lost.
I've tried saving it to a text file, but that doesn't save the colors of the text.
Is there any way I can save the text and the colors of the lines even when the form closes?
Here's what the excellent suggestion from Shrotter might look like:
Public Class Form1
Private RtfPath As String
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim folder As String = System.IO.Path.GetDirectoryName(Application.ExecutablePath)
RtfPath = System.IO.Path.Combine(folder, "RtbData.rtf")
If System.IO.File.Exists(RtfPath) Then
RichTextBox1.LoadFile(RtfPath)
End If
End Sub
Private Sub Form1_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
RichTextBox1.SaveFile(RtfPath)
End Sub
End Class
Of course, you should always wrap the loading/saving of the file in a Try/Catch block in case anything goes wrong.
I am seeing some odd behaviour in the VB.Net End If statement when it has a breakpoint set. When the If statement is false the program arrives at the End If breakpoint and will continue after clicking continue. When the If statement is true the program arrives at the breakpoint but it does not continue after pressing continue. You have to press continue a second time. Is this normal? I'm asking the question because I am having trouble debuggging a subroutine and while this is probably my fault the End If behaviour is the only thing I can see at this time that I can't explain. The code below with breakpoints set on the End If's is all that is needed to test this and it can be placed anywhere. I used two buttons.
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
If 1 = 0 Then
End If
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
If 1 = 1 Then
End If
End Sub
Try using a variable a = 1. If that does not work. You may try copying the code to a new project and try your code there.
I am updating code done in VB 4, where I have a RichTextBox. I need to be able to drag-and-drop an image from Windows Explorer into the RTB. Unfortunately, I am unable to get the drag-and-drop to work.
I've created a much more simple Windows Form program to try to resolve this, but have made no progress. I begin by setting AllowDrop to True.
Public Sub New()
InitializeComponent()
Me.DragAndDropTextBox.AllowDrop = True
End Sub
I then create handlers for the RTB. These are taken directly from MSDN.
Private Sub DragAndDropTextBox_DragEnter(ByVal sender As Object, ByVal e As _
System.Windows.Forms.DragEventArgs) Handles DragAndDropTextBox.DragEnter
' Check the format of the data being dropped.
If (e.Data.GetDataPresent(DataFormats.FileDrop)) Then
' Display the copy cursor.
e.Effect = DragDropEffects.Copy
Else
' Display the no-drop cursor.
e.Effect = DragDropEffects.None
End If
End Sub
Private Sub DragAndDropTextBox_DragDrop(ByVal sender As Object, ByVal e As _
System.Windows.Forms.DragEventArgs) Handles DragAndDropTextBox.DragDrop
System.Windows.Forms.DragEventArgs) Handles DragAndDropTextBox.DragDrop
Dim img As Image
img = Image.FromFile(e.Data.GetData(DataFormats.FileDrop, False))
Clipboard.SetImage(img)
Me.DragAndDropTextBox.SelectionStart = 0
Me.DragAndDropTextBox.Paste()
End Sub
When I grab an image in Explorer and drag it over my window, I get the circle with a slash. I have put breakpoints on the first line of each of the handlers, and they are never reached. I have looked at several pages, and they all seem to give the same process, so I must be missing something simple.
I am not worried right now about pasting the image into the text box; I know I need to work on that. I am only trying to capture the image, but the handler methods do not seem to be getting called.
UPDATE
After quite a bit of experimentation, I found that the actual issue is with my Visual Studio 2010, which I always run as administrator. When I run the program from an exe, the drag-and-drop works. When I try running from VS in debug, it does not. Has anyone experienced this before?
If anyone could shed some light on this, I would be very grateful.
Try getting rid of the InitializeComponent() call in your Sub New function. When I did that, I was able to detect the DragEnter event. Here is the code I tested (I created a simple WinForm and put a RichTextBox on it called DragAndDropTextBox):
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
DragAndDropTextBox.AllowDrop = True
End Sub
Private Sub DragAndDropTextBox_DragEnter(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles DragAndDropTextBox.DragEnter
Debug.Print("Entering text box region")
' Check the format of the data being dropped.
If (e.Data.GetDataPresent(DataFormats.FileDrop)) Then
' Display the copy cursor.
e.Effect = DragDropEffects.Copy
Else
' Display the no-drop cursor.
e.Effect = DragDropEffects.None
End If
End Sub
Private Sub DragAndDropTextBox_DragDrop(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles DragAndDropTextBox.DragDrop
Dim img As Image
img = Image.FromFile(e.Data.GetData(DataFormats.FileDrop, False))
Clipboard.SetImage(img)
Me.DragAndDropTextBox.SelectionStart = 0
Me.DragAndDropTextBox.Paste()
End Sub
End Class
The InitializeComponent() call should appear in your code (I believe) when you add your own custom controls to a form. Otherwise, I don't think you need to call it.
It turned out that the Drag-And-Drop was working when running the code from an exe, but not from within Visual Studio. More searching turned up this answer, which states that Drag-And-Drop does not work in Visual Studio when it is run as an Administrator. I ran it with normal permissions, and the code worked.
It really drives me crazy, I have a form, I am calling a public sub called "timerss" in the form load event, when i run my form the sub "timerss" works perfectly, but when i add "Me.MdiParent = MDIParent1" in load event the sub "timerss" doesn't work!! i am really confused here!! any idea please.
Private Sub Main_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.MdiParent = MDIParent1
timerss()
End Sub
update1:\ check the print screen of the result when running my form with and without setting MdiParent!
update2: I managed to fix part of the problem which is i got the data but what i want now is to set the color of the time cells with red, as i said the sub don't want to work, the timerss sub is:
For m As Integer = 0 To DataGridView1.Rows.Count - 1
If DataGridView1.Rows(m).Cells(4).Value > DataGridView1.Rows(m).Cells(9).Value Then
DataGridView1.Rows(m).Cells(4).Style.BackColor = Color.Red
MsgBox("red")
End If
Next
as u c in the above code i put a msgbox just to make sure that the code is working, so when i run my form the msgbox appears, but the backcolor function doesn't work when i set the MdiParent.
I don't know why the behavior is different without MDIParent, but you could try calling the sub from the DataBindingComplete event.
I had a similar problem and solved it using the event.
I made a small program ( in visual studio 2013) that simply displays a label in Form1 and a message when closing it. However, when I open it, it has the loading cursor that never stops. Can anyone help me please?
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
End Sub
Private Sub PictureBox1_Click(sender As Object, e As EventArgs)
End Sub
Private Sub Form_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
Dim response As MsgBoxResult
response = MsgBox("Skype must be restarted.", MsgBoxStyle.Exclamation + MsgBoxStyle.OkOnly, "Confirm")
If response = MsgBoxResult.Ok Then
Me.Dispose()
End If
End Sub
End Class
Cause of Error?
Look, I can't clearly say what the error is, but I find, the two main things because of which you are getting the error are:
There is a background task in your computer who is generating this, or, your Visual Studio's Environment is taking too long to load it's features.
The second error may be that, your cursor is set to loading.
Steps to Overcome
You need to go to your form's properties and set the cursor property to default or whatever you want. This can do your work, if you are having the second problem.
You can set different cursor property for different controls.
I hope this helps!