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Some barcode readers are very basic, all they do is fill in whatever control has focus. Meaning, whatever textbox has focus when you scan the barcode it will just dump the string right into the textbox. No logic or complexity to it. So, it will all depend on the barcode reader you have.
There are only 10 types of people in the world, those who understand binary and those who don't.
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Please I'm using vb.net 2013 and I have a textbox named txtRecipients
Now i want to check for the following:
1. The phone no. should always start with 233 followed by any digit other than zero like: 233201245685
2. Multiple phone numbers should be separated by a comma, like 233201245685, and the comma replaced automatically before the start of another phone number in the same format. So if two phone numbers are entered they should be like this:
233201245685,233547345696
I did something like this in the leave event. Is there any better way to do this as the comma is not getting replaced at a specific position. I used both the remove and replaced functions, but that did not work. Thanks in advance
<pre lang="vb">
Dim str1 As String = Mid(Me.txtRecipients.Text, 1, 1)
Dim str2 As String = Mid(Me.txtRecipients.Text, 2, 1)
Dim str3 As String = Mid(Me.txtRecipients.Text, 3, 1)
Dim str4 As String = Mid(Me.txtRecipients.Text, 4, 1)
Dim str13 As String = Mid(Me.txtRecipients.Text, 13, 1)
If str1.Trim <> 2 Then
Me.txtRecipients.Focus()
MsgBox(The first digit must be 2)
Exit Sub
End If
If str2.Trim <> 3 Then
Me.txtRecipients.Focus()
MsgBox(The second digit must be 3)
Exit Sub
End If
If str3.Trim <> 3 Then
Me.txtRecipients.Focus()
MsgBox(The third digit must be 3)
Exit Sub
End If
If str4 = 0 Then
Me.txtRecipients.Text.Replace(0, String.Empty)
Me.txtRecipients.Focus()
MsgBox(Phone No. must not start with 0. Format e.g. 233243404804)
Exit Sub
End If
If str13 <> "," Then
' Me.txtRecipients.Text.Replace(str13, ",")
Me.txtRecipients.Focus()
MsgBox(Phone No. must not start with 0. Format e.g. 233243404804)
Exit Sub
End If
</pre>
-- modified 23-Sep-14 13:46pm.
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I will use first a split on the comma(Me.txtRecipients.Text.split(",") and walk throu the array. Check the first tree chars in 1 time. string.substring()
check the others with like (string like "233#####")
Jan
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I have this
textbox that users enter their names, but
I realized that they enter their names by entering so many spaces. I used the
replace function but it does not work well. Is there anyway to prevent this at
keypress, when the user tries to press the space bar more than once? Thank you,
all.
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Member 11078565 wrote: I used the
replace function but it does not work well.
What does that mean? Did you use it correctly?
yourString = yourString.Replace(" ", " ")
or with Regular Expressions:
yourString = System.Text.RegularExpressions.Regex.Replace(yourString,"\\s+"," ")
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Trap the keydown/up event, inspect the current and previous characters in the string, if they are both a space then deal with it in the event.
Never underestimate the power of human stupidity
RAH
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I am making a little app and I am stuck. I have a multilined textbox and I would like a button to take the text and reverse the line order. So if the text was numbered each line as 1->9, pressing the button will reorder the lines so they are 9->1.
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Member 11096018 wrote: I am making a little app and I am stuck.
Where are you stuck? Edit your message and show exactly which part you are having problems with.
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i figured it out
Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click
Dim counter As Integer = txtNames.Lines.Length - 1
' create array to reverse line order
ReDim fileNames(counter)
For iLine = 0 To counter
fileNames(counter) = txtNames.Lines(iLine)
Next iLine
' using the array building a string starting from the end of the array
Dim list As String = ""
For iLine = 0 To counter
list = list + txtNames.Lines(counter) + vbCrLf
counter = counter - 1
Next iLine
'display results
txtNames.Text = list.Trim
End Sub
modified 20-Sep-14 4:26am.
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Good day friends! Please, does anyone know where I can download ebook for dx 11 and vb?
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Sorry to state the obvious, but I would try Google.
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You're not going to find any books on VB6 any more let alone with DirectX support in them.
Managed DirectX died quite a long time ago but there are third party alternative like SlimDX and SharpDX, though, there aren't any books on those libraries as far as I can find.
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PictureBox1.Left += And() +6
if PictureBox1.left > 1000 then
PictureBox1.location = new point (150, 140)
end if
thanks
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That first line is not valid VB.NET code. It'll never compile so there's really nothing to convert it to.
Seriously, VB6?? It's been dead for quite a long time now.
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Seems that line
PictureBox1.Left += And() +6
is erratic - or do you really have a function named 'And'?? If so you'll have to enclose this VB key word in square brackets like
PictureBox1.Left += [And]() +6
otherwise remove it to:
PictureBox1.Left += 6
This will move your picture box 6 pixel to the right an if resulting position exceeds 1000 pixel, the picturebox position will be reset to a default.
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Hello !
I'm using VB.net 2013 and SQL server 2008R2.
I'm writing a financial application , and I'm not sure about which data type to use.
I know that decimal is more precise that float , but I read that using decimal can significantly decrease the speed of calculations and the speed of storing data to database , so the speed of the application.
Is this true , and if yes is there a solution or should I continue to use float ?
Thank you !
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dilkonika wrote: writing a financial application
Are you sure that you need decimal/float here? What about storing/calculating with Cents instead of Dollars - thus avoiding fractions at all?
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For finacial calculations SQL Server has a MONEY datatype
=========================================================
I'm an optoholic - my glass is always half full of vodka.
=========================================================
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Never use float (or double) for financial applications, as they are base 2 numbers and cannot accurately hold base 10 values. You can sometimes use integers, depending on the currency and values you need to represent.
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I have to use a kind of data type that accept digits after decimal point.
so I need to choose between float and decimal.
But it is true that working with decimal is about 20 times slower than working with float ?
This is my question.
Thank you !
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dilkonika wrote: have to use a kind of data type that accept digits after decimal point.
Not if you get a little creative. Multiple all values by 100 and You can use integer types quite easily.
If you're still thinking about using single/double/float for money values, think again. Try this and see what you get:
static void Main(string[] args)
{
float x = 12345678.33f;
Console.WriteLine(string.Format("{0:N8}", x));
}
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It seems that nobody give a response to the question : Is true that working with decimal is several time slower that working with float ?
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You seem to be focusing on the wrong thing.
What good is the speed of using a datatype when the type doesn't even accurately hold the values you're trying to use?
There is a very good reason why nobody in the finanical industry uses single/double/float. Being "close enough" with money values does not cut it.
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No, not "several" times. If you want to know the difference, write a loop and TRY IT.
And as the others have already pointed out, both float and decimal are the wrong choice.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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