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What do you want ? What sort of array do you mean ? An array of pixels ? Of letters ?
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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My aim is to store the letters in two dimensional array. The array must be a label object so I can easily place pictures behind of these labels also. I have 10 rows and 8 columns in each row. It is a simple matrix but must be made by label objects.
If I do this internally (nor at design time), How I could write AdHandlers for each specific label object to check if it is selected or clicked.
Thanks a lot!
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Sounds like you need to write a custom control. Do you mean each label contains a letter, but the letters also map back to positions in an array, so if you change the array, the controls change ? If so, you need to write code to map an array of letters to an array of controls.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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i know this is a c# forum but couldn't find one vb. if i get a sample how to it in C# no prob i can convert it
Default using vb.net to post to a website
i want to post a string to a website can anyone show me or point me to example of how you would use vb.net to post a string to a website and accept the response sent back from post / request to the site?
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Hello,
1°) I would like to know how to recognize a readonly directory in advance
only without having to await the code error of return in attempt at writing
on this one as one can let it to know if a file is system, file, reading, hidden.
2°) I would like to also know how to detect the authorizations (permissions,
accounts authorized) of writing on a directory without having to await the code error of return in attempt at writing on this one like one does it for
a file.
This question is independent of the first because the directory can be
in read/write but that only for certain people thus useless to go further if it is already in readonly mode.
I tested by the code according to various tests:
Dim FolderBrowserDialog1 as FolderBrowserDialog = New FolderBrowserDialog()
Dim MyAttr asFileAttribute
If FolderBrowserDialog1.ShowDialog() = Windows.Forms.DialogResult.OK Then
MyAttr = GetAttr(FolderBrowserDialog1.SelectedPath)
MsgBox(MyAttr.ToString) 'response : Directory
MsgBox(File.GetAttributes(FolderBrowserDialog1.SelectedPath).ToString)
'response : Directory
Dim information as System.IO.FileInfo
information =
My.Computer.FileSystem.GetFileInfo(FolderBrowserDialog1.SelectedPath)
MsgBox(information.IsReadOnly) 'response : always false even if the
directory is readonly mode
End If
in advance thank you with all
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A ReadOnly folder is easy enough. All you need in the File class and it's GetAttributes[^] method.
You shouldn't be attempting to calculate your own access levels. There's simply so many levels of security and inheritance affecting file access from your code that the best way of reliably testing access is to try to create your file! You can calculate NTFS permissions all you want, but code access permissions can also affect your ability to write a file. What this means is that NTFS can say that it's perfectly OK for you to create a file, but code access permissions can deny you!
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hi.
can someone pls direct me in how i can go about working out how i can capture printpreview/printdocument data and save into a file for example
doc, txt ,pdf or anything you can assist with..
many thanks.
Robbo
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Are you trying to capture the data that's going to the printer?? Or are you trying to capture an image of the Print Preview?? In your application or any application??
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hi Dave. Thanks for replying. ive already got a print method working where i can see data in print preview but need to work out if i can capture everything in my print preview and save it to a file whether it'd be a pdf or doc or anything you can advise me with. and YES its for my APP and in my app that i need to do this.
Thanks Dave
Robbo
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You'd use the same code you use to draw your print document to draw to a bitmap if you wanted.
A PDF is a bit of a different story. You'd have to use some kind of PDF library to create the file and you can probably get away with using, again, the same drawing code you're using to generate the print preview.
I don't have any example or knoweldge of any PDF libraries because I simply don't need them and don't use them for anything I do. There's a bunch of them though, just Google for ".net pdf library"[^].
Dave Kreskowiak
Microsoft MVP - Visual Basic
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thanks dave. so what function or commands am i looking to use and to capture the bitmap.
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There really isn't any. You create a bitmap object the size you need, then create a Graphics object from it, pass that to your drawing code and your code should draw everything using that Graphics object. Done. Everything just got drawn to your bitmap. You can do whatever you want with the image then.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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I am having difficulty iterating through an array. I have found the following sample code and tried modifying it with my variables.
' Sample Array Read Code
'For i = 0 To arrList2.Count - 1
' Console.WriteLine(CStr(arrList2.Item(i)))
'Next
After modifying line 3 with x = CStr(arrList2.Item(i)) , I receive the following error: "Value of type 'String' cannot be converted to '1-dimensional array of String'." X is defined as: Dim x() As String
I need to get each element (which is a name read from a textbox) into a variable strName. This is to allow my SQL statement to create a record for each name in the array.
Any help would be greatly appreciated!
Thank you in advance.
LWhite
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Larry White wrote: After modifying line 3 with x = CStr(arrList2.Item(i)) , I receive the following error: "Value of type 'String' cannot be converted to '1-dimensional array of String'." X is defined as: Dim x() As String
It's always best to copy and paste the actual code you're using. Don't post a sample and then tell use what you did to it. It makes it very difficult to see what you actually did.
x doesn't have an Item property, so the code should look more like this:
For i = 0 To x.GetUpperBound(0)
Console.WriteLine(x(i))
Next i
Notice, you don't need CSTR. This is because your x array is an array of Strings. Why try to convert a String to a String??
Also, to get your code to show up in the nice beige box and retain some formatting, paste it between <pre> and </pre> tags.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Thank you. The tags do make it alot easier to read.
LWhite
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Why do you declare the x variable as an array? As you are going to use it to reference a string, declare it as a string:
Dim x As String
---
single minded; short sighted; long gone;
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I adjusted my code as follows:
Dim x As String
For i = 0 To arrList2.Count - 1
x = arrList2.Item(i)
strName = arrList2.Item(i)
I now get the qty of data entries in my database equal to the number of names I select in the textbox, but the last entry is blank. If I select 3 names, I get the first 2 database entries with the names, but the last one is blank (name field). It appears the first iteration leaves strName blank.
Thanks again for the assistance.
LWhite
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The code that you have shown is correct, although reading the same value from the array twice into separate variables doesn't look like what you want to do.
The problem that you talk about is in the part of the code that you haven't shown. Unless you show it, I can't tell you much more than that it's wrong...
---
single minded; short sighted; long gone;
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Here are the other relevant parts of my code. I build the textbox entries with the following, which also drops the selected names into the array:
Private Sub lbName_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lbName.SelectedIndexChanged
editName.Text = Nothing
For i = 0 To lbName.SelectedItems.Count - 1
arrList2.Add(strName)
With arrList2
.ToArray()
End With
editName.Text = editName.Text & lbName.SelectedItems(i) & vbCrLf
strName = lbName.SelectedItems(i) & vbCrLf
Next
End Sub
Here is my complete code that is supposed to create a new database record with each iteration of the name array:
For i = 0 To arrList2.Count - 1
strName = arrList2.Item(i)
x = arrList2.Item(i)
Dim strCommandText As String = "INSERT INTO Orders(OrderDate, DeliverDate, DeliverLocation, Name, Special, Comments, Rate, EMPLID, LoggedIP)" _
& "VALUES('" & strOrderDate & "','" & strDeliverDate & "','" & strDeliverLocation & "','" & strName & "','" & strSpecial & "','" & strComments & "','" & strRate & "','" & strEMPLID & "','" & strLoggedHost & "')"
Dim cmd As New SqlClient.SqlCommand(strCommandText, SqlConnection1)
cmd.ExecuteNonQuery()
Next
Thank you for your assistance.
LWhite
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The code look pretty strange...
Where do you declare the strName variable? You use the strName variable, but you haven't given it any value before using it. You give it a value later in the loop, so it will have a value for the next iteration of the loop, but not for the first iteration. Also, the value that you assign to it in the last iteration will never be used.
You create an array from the items in the list arrList2, but you just throw the array away without doing anything with it. Why?
---
single minded; short sighted; long gone;
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When the form opens, I have a "Dim strName As String" along with other variables. Thank you, you got me thinking and I rearranged my code. It works now. Here is what it looks like now:
Private Sub lbName_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lbName.SelectedIndexChanged
editName.Text = Nothing
tbEmplid.Text = Nothing
For i = 0 To lbName.SelectedItems.Count - 1
strName = lbName.SelectedItems(i) & vbCrLf '.ToString & vbCrLf
arrList2.Add(strName)
With arrList2
.ToArray()
End With
editName.Text = editName.Text & lbName.SelectedItems(i) & vbCrLf
Next
End Sub
Note: I moved the "strName = lbName.SelectedItems(i) & vbCrLf" line above the "arrList2.Add(strName)" line, instead of being the last line. It sequences through nicely now. I trash the array, is it is only for the record creation and not needed after that.
Thank you again! I hope posting this code will help someone else!
LWhite
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That looks better.
Any variables you can, you should declare locally inside the method, instead of declaring them in the class. Local variables are allocated on the stack, are very inexpensive, and only exist when they are needed. Class variables increases the size of your form object, and they take up memory even when they are not used.
You still have some strange code...
With arrList2
.ToArray()
End With
This does the same as:
Dim s() as String
With attList2
s = .ToArray()
End With
s = Nothing
In other words, the only thing that it does is wasting time and memory resources. You create one array each iteration of the loop, and not any of the arrays are ever used for anything.
---
single minded; short sighted; long gone;
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Dim sql1 As String = "Select (LastName + ', ' + FirstName) As Name, emplid FROM Users ORDER BY LastName"
Dim strCommandText As String = "INSERT INTO Orders(OrderDate, DeliverDate, DeliverLocation, Name, Special, Comments, Rate, EMPLID, LoggedIP)" & "VALUES('" & strOrderDate & "','" & strDeliverDate & "','" & strDeliverLocation & "','" & strName & "','" & strSpecial & "'" & ",'" & strComments & "','" & strRate & "','" & strEMPLID & "','" & strLoggedHost & "')"
Private Sub lbName_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lbName.SelectedIndexChanged
Dim i As Integer
editName.Text = Nothing
For i = 0 To lbName.SelectedItems.Count - 1
arrList2.Add(lbName.SelectedItems(i))
With arrList2
.ToArray()
End With
editName.Text = editName.Text & lbName.SelectedItems(i) & vbCrLf
Next
i = Nothing
End Sub
Private Sub btnAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAdd.Click
Dim i As Integer
Dim r As String
Dim x As String
editComments.Clear()
strComments = editComments.Text
Try
SqlConnection1.Close()
cnn1.Close()
SqlConnection1.Open()
' Create a name array from editName textbox; Used to create a new record for each name
For i = 0 To arrList2.Count - 1
strName = arrList2.Item(i)
x = arrList2.Item(i)
Dim strCommandText As String = "INSERT INTO Orders(OrderDate, DeliverDate, DeliverLocation, Name, Special, Comments, Rate, EMPLID, LoggedIP)" & "VALUES('" & strOrderDate & "','" & strDeliverDate & "','" & strDeliverLocation & "','" & strName & "','" & strSpecial & "'" & ",'" & strComments & "','" & strRate & "','" & strEMPLID & "','" & strLoggedHost & "')"
Dim cmd As New SqlClient.SqlCommand(strCommandText, SqlConnection1)
cmd.ExecuteNonQuery()
Next
Catch eEndEdit As System.Exception
System.Windows.Forms.MessageBox.Show(eEndEdit.Message)
Finally
If strRate = strRateBreakfast Then
MessageBox.Show("Galley orders for BREAKFAST on: " & Now() & " have been successfully entered!", MessageBoxIcon.Information)
ElseIf strRate = strRateDinner Then
MessageBox.Show("Galley orders for DINNER on: " & Now() & " have been successfully entered!", MessageBoxIcon.Information)
End If
SqlConnection1.Close()
cmd = Nothing
End Try
Close()
End Sub
LWhite
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Hi Guys,
I'm facing a problem in serializing a class object in VB.Net. In this case, the
class contains two public properties and an arraylist . Class structure and Code for
serialization are given below. It serializes only the public properties, not the
arraylist. It throws a "System.InvalidOperationException..The type Photos was not
expected. Use the XmlInclude or SoapInclude attribute to specify types that are not
known statically". I have no idea about where to include these attributes... Pls
help..
<br />
<br />
'Class Definition<br />
<br />
<Serializable()> _<br />
Public Class SitePhotos<br />
Private _Outdoordesc As String<br />
Public Property Outdoordesc() As String<br />
Get<br />
Return _Outdoordesc<br />
End Get<br />
Set(ByVal value As String)<br />
_Outdoordesc = value<br />
End Set<br />
End Property<br />
<br />
Private _ShelterEntrance As String<br />
Public Property ShelterEntrance() As String<br />
Get<br />
Return _ShelterEntrance<br />
End Get<br />
Set(ByVal value As String)<br />
_ShelterEntrance = value<br />
End Set<br />
End Property<br />
<br />
'Arraylist to store photo descriptions<br />
<br />
Public _PhotoList As New System.Collections.ArrayList<br />
<br />
Public Sub AddPhoto(ByVal photoObj As Photos)<br />
_PhotoList.Add(photoObj)<br />
End Sub<br />
<br />
Public Sub RemovePhoto(ByVal range As String)<br />
Dim _pht As Photos<br />
'Dim i As Integer<br />
<br />
<br />
For Each _pht In _PhotoList<br />
<br />
If _pht.posRange = range Then<br />
_PhotoList.RemoveAt(_PhotoList.IndexOf(_pht))<br />
End If<br />
<br />
Next<br />
<br />
End Sub<br />
<br />
<br />
Public ReadOnly Property PhotoList() As ArrayList<br />
Get<br />
Return _PhotoList<br />
End Get<br />
End Property<br />
<br />
End Class<br />
<br />
'Structure of each photo description<br />
Public Structure Photos<br />
Public Pos As Integer<br />
Public Desc As String<br />
Public posRange As String<br />
End Structure<br />
<br />
<br />
<br />
'Code for serialization<br />
<br />
Dim extraTypes(0) As Type<br />
<br />
extraTypes(0) = GetType(SitePhotos)<br />
<br />
Dim xSerializer As XmlSerializer = New<br />
XmlSerializer(GetType(GeneralSiteInfo.SitePhotos), extraTypes)<br />
<br />
Dim xWriter As StringWriter = New StringWriter()<br />
<br />
' Since the serialization can exception, we'll encase it in a try/catch<br />
' mechanism, so we can report the error properly<br />
<br />
Try<br />
xSerializer.Serialize(xWriter, objPhotos)<br />
<br />
'xmlSitePhotos is a hidden control to which i can store value. <br />
<br />
_xmlSitePhotos.Value = xWriter.ToString()<br />
<br />
Catch ex As Exception<br />
<br />
MsgBox(ex.ToString())<br />
'MsgBox("Could not serialize Site Photos", MsgBoxStyle.Critical, "Error<br />
Saving Site Photos")<br />
<br />
End Try<br />
<br />
xWriter.Close()<br />
<br />
<br />
thanks,
Sebastian
-- modified at 13:10 Friday 9th February, 2007
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Add this line just before your SitePhotos Class
<Serializable(), Xml.Serialization.XmlInclude(GetType(Photos))> _
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