VS 2010 Length Of The String In Pixels?

Feb 3, 2012

I have a title (in one line) that can have different lengths. I need to print this title on A4 landscape - page ( draw string in print page event), but always it should be located in the middle of the page, regardless of length. If I want to determine the exact location I have to calculate the length of the string in pixels. Or maybe there is a better way to center the string on page? How can I do it?

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Determine The Length Of A String In Pixels?

Jun 29, 2010

I am trying to determine the length of a string in pixels.

I created a little test program for myself and placed three labels on it, each with the same font in a different size. I set the width of the label to 1024, the screenwidth. I used the same test text for each label, cutting it off at the last character that shows, so there is not hidden text running off the label to be included in the string width count.

What I have found is that the width of the string is being reported as wider than the label, even though, as I just mentioned, there are no characters running off the edge of the label. So, something's awry. Does anyone know how to get an accurate width?

Here follows the whole test code. You can drop three labels on a form and run it to see what I mean.

Code:
Option Explicit On
Option Strict On
Public Class frmMain

[Code].....

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VS 2010 - String Length No Longer Available

Jul 17, 2011

I have an API that loads into memory from a button click. It can then either load an approx 10MB txt file (ASCII comma delimited characters/decimal list as a string) or live timed data from the internet. The idea is to be able to view the data in a text box. From there I can see what I am doing as far as spitting that info into a datagridview or database. The data is completely out of order in the txt file but has various Getinfo Functions / DLL's accessed via button clicks that split the data into its correct format to display in the text box. The problem I am having is not having fixed length strings in VB 2010. I don't know enough to work out if there is a simple work around or something more complicated required. Everything I have tried has left the textbox empty.

VB 2005 code that works:
Option Strict Off - I want to solve with this ON
Option Explicit On - I want to solve with this ON
Imports VB = Microsoft.VisualBasic
Private Sub Command3_Click(ByVal eventSender As System.Object, ByVal eventArgs As
[Code] ....

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VS 2010 String.Length() Returns Null

Jun 11, 2011

[Code]...

By my logic, this should only assign .length to index IF the length of strItem is longer than 0. This check is there in case the listbox is empty, or the user has not selected an item. However, everytime I go through this code without an item selected I get:

[Code]...

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Substring - Error: Index And Length Must Refer To A Location Within The String. Parameter Name: Length

Apr 17, 2009

this is not working?

[Code]...

End WhileI am trying to read from the ": " to the end of the line. I keep getting this error: Index and length must refer to a location within the string. Parameter name: length

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Index And Length Must Refer To A Location Within The String. Parameter Name: Length Exception

Feb 17, 2011

am getting the above exception while swaping Items in the list(lstRoutePriority).PFB my code

if (lstRoutePriority.SelectedIndex > 0)
{
//Swap the two items

[Code].....

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VS 2010 Get Length Of String Minus The Line Feeds

Jan 27, 2012

Need to get length of a string minus the line feed chars and came up with this. Is there a better/more efficient way?

Function GetLenMinus_LF(s As String) As Integer
s = s.Replace(ControlChars.Lf, String.Empty)
Return s.Length
End Function

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Pixel Counter - Count The Black Pixels The Grey Pixels The More Grey Pixels

Jul 27, 2009

I'm trying to make a -what i thought would be simple app.My intention was to build program that:1) i'd provide a grayscale image2) the program would count the black pixels the grey pixels the more grey pixels etc. (the hue) and the white3) would make the percentage sum of all pixels, that is: 300.000 black pixels (rgb 0 0 0) etc. given that 0 is the black, 100 the white. e.g a simple grayscale image is 55.2 white

This was my way and i don't think that is useful:

First of a button to convert the image to greyscale:

Dim bm as new Bitmap(source.Width,source.Height)

Dim x

Dim y

[CODE]...

Secondly, -and that's the stupid way- i did -or better i wanted to do- this: i put the code to dynamically create labels, each label having the colour of a pixel as background colour and as text the colour converted to rgb

The third step which i intended to do (i couldn't get pas two) was to sum up the labels etc.

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VS 2010 Modify Length Of String And Delete Unneeded Characters?

Feb 19, 2012

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim fso, inputFile
Dim str As String
fso = CreateObject("Scripting.FileSystemObject")

[code]....

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Output Error "Index And Length Must Refer To A Location Within The String. Parameter Name: Length" With Substring

Mar 23, 2009

"Index and length must refer to a location within the string. Parameter name: length" whenever I run this code

[Code]...

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Substring Size - "Index And Length Must Refer To A Location Within The String. Parameter Name: Length"

Jul 21, 2010

If using the following in an if statement I get an error: If trg.Name.Substring(4, 6).ToUpper <> ("ABCDEF") Then I get the error: "Index and length must refer to a location within the string. Parameter name: length"

I assume this is because the string (trg.name) is too small for the 4, 6 substring. What would be the correct method of working around this problem? VB.net Studio 2008.

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VS 2010 Conversion From String "Length - Ft" To Type 'Double' Is Not Valid?

Sep 6, 2011

I'm new to this board and I was wondering if you guys could help me out. I have a problem that needs to be resolved before 9:30PM tonight.

I'm a bit of a sloppy coder so work with me. Here's the code that's giving me problems:

[Code]...

I have 6 text boxes, 5 of which accept input. When they're focused on they become blank for a number to be typed in and upon losing focus, they add the labels etc. on their own.

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Way To Return A Width Of String In Say / Pixels / Inches Or Some Unit Of Measurement

May 14, 2002

I know that you can return the length of a string, which results in the number of characters and spaces. Is there a way to return a width of the string in say, pixels,inches or some unit of measurement.

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When Transfer The Bytes Sent By The Client Program To A String The String Length Is Affected?

Feb 20, 2010

when i transfer the bytes sent by the client program to a string the string length is affected.when i put the bytes sent by the client program to a message box. it returns the corrrect text. but when i check the length it will return 8192 or higher. but the actual size is just 5.

My Code

Dim tcpClient As TcpClient = tcpListener.AcceptTcpClient()
RichTextBox1.Text = RichTextBox1.Text & vbNewLine & "Connection accepted."
' Get the stream[code]....

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VS 2010 Expertise About Pixels And Colors?

Jun 28, 2011

I'm having some trouble with getting my code to scan a specific pixel on my screen for a specific color, and then react when the right color appears. Here's what I'm trying to do:

I have 3 hotkeys. Each hotkey starts a scan for a specific color (lets say #244FA3" ect.) and all 3 searches is looking/searcing for the colors at the same pixel/spot on the screen (lets say x=600, y=700).
Each of the seaches has its individual timer, so the code is actually the same in each timer - it only needs to search for a different color. Each timer is activated by a hotkey.

I just can't figure out how to search for the color at the specific pixel, and then react when the color is found. And it should be fairly fast (search like every 0.1 second after it's activated)

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VS 2010 Specify The Pixels Per Inch For The Resolution?

Aug 31, 2011

I have a picturebox that loads an image then resizes it and saves it which I know how to do in code

dim iBit as new Bitmap = picturebox1.image, picturebox1.width, picturebox1.height

What I want to do is be able to specify the Pixels Per Inch for the resolution.

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Split A String Into A Fixed Length String Array?

Sep 11, 2011

I have a long string like this

dim LongString as String = "123abc456def789ghi"

And I want to split it into a string array. Each element of the array should be in 3 characters length[code]...

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VS 2010 - Bitmap Pixels Per Inch/Centimeter?

Mar 10, 2011

I have scanned a few img's on 600 DPI. When i load them into a Bitmap class They have Vertical and Horizontal Resolution of 96 PPI To my calculation that is very close to 38 Pixels per centimeter. Now the image that I scanned is 4.5 Centimeter (1.77165354 Inch) In Diameter but When I measure It the 4.5 cm img is close to 1080 pixel in Diameter which is 240 Pixels/Centimeter (609.6 Pixels/inch) What is the correct way to get the actual Pixels per inch/centimeter from a bitmap or was it set incorrectly by my scanner ?

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VS 2010 - Image Size Is In Points Or Pixels?

Sep 30, 2011

On forms size and such, is it in points or pixels? I'd assume pixels, however, it seems when i make a image that is in the same size, (i put the size as the dimensions for pixels), the image seems not the same size. I'm unsure of how big a "point" is, but i am aware of a pixel.

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Getting String.substring(N) Not To Choke When N > String.length

Mar 10, 2010

I'm writing some code that takes a report from the mainframe and converts it to a spreadsheet. They can't edit the code on the MF to give me a delimited file, so I'm stuck dealing with it as fixed width. It's working okay now, but I need to get it more stable before I release it for testing. My problem is that in any given line of data, say it could have three columns of numbers, each five chars wide at positions 10, 16, and 22. If on this one particular row, there's no data for the last two cols, it won't be padded with spaces; rather, the length of the string will be only 14. So, I can't just blindly have

[Code]...

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Vb String Function - Get The Sub String That Is Talking About Length

Nov 4, 2010

If I have a string Metal is hot : Metal length is 5 cm ; Metal is red. I want to get the sub string that is talking about length: hence I want to extract "Metal length is 5 cm".

[Code]...

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Counting The Length Of A String?

Oct 29, 2009

How can I count the length of a string and also how many special characters are in the strings.

For instance if I have this string: $how*

How can I count that string is 5 chars long and that there are 2 special characters in the string. (special characters are the $ and

I think that I am going to have to use the .length method to count the length of the string.

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Field Cannot Be A Zero-length String

Mar 2, 2012

i had the code belowing workin fine before but all of a suden i have a error init

[Code]...

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How To Get String Length Of ReadData

Apr 6, 2011

I was trying to grab the string length of readData but when I try msgbox (readData.Length),
its giving me a large numeric digit instead.
Dim readData as string
serverStream.Read(inStream, 0, buffSize)
Dim returndata As String = _
System.Text.Encoding.ASCII.GetString(inStream)
readData = "" + returndata
msg()

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Set Max String Length In A Class?

Mar 2, 2009

Is there any way to set max string length in a class used in a VB.NET web service so it gets into the WSDL as a maxLength attribute?

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Setting The String Length ?

Apr 15, 2010

With setting the string length. I have got a streamreader reading from a .doc file into a listbox and then i want to set the string length of how long it to be and then if longer to go to the next line so it will fit in the listbox as the listbox you cant scroll accross but you can up and down.

Ive done this so far:

Try
Dim file_name As String = "K:\Uni\Year 2\Visual Basic\Report\MSDN\Absolute Beginner's Series VB Lesson 1\01 VB Lesson Transcript.doc"

[CODE]........................

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String Length Not Working?

Jul 16, 2009

I have the below code that if there is no .wav file in the current directory then it goes to the default windowsmedia directory to play a random .wav file.

But for some reason if there is no file in the current folder it will not go to the windowsmedia folder, do I have something wrong?

Dim FileNames As String() = System.IO.Directory.GetFiles(".", "*.wav")
Dim FileNames2 As String() = System.IO.Directory.GetFiles("C:WindowsMedia", "*.wav")

[Code]....

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C# - Ensure That A String Property Is Of A Particular Length?

Sep 2, 2010

I've created some classes that will be used to provide data to stored procedures in my database. The varchar parameters in the stored procs have length specifications (e.g. varchar(6) and I'd like to validate the length of all string properties before passing them on to the stored procedures.

Is there a simple, declarative way to do this?

I have two conceptual ideas so far:

Attributes
public class MyDataClass
{
[MaxStringLength = 50]

[Code]....

This seems like a lot of work and will really make my currently-simple classes look pretty ugly, but I suppose it will get the job done. It will also take a lot of copying and pasting to get this right.

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Checking String If 7 In Length And Contain Any Other Characters

Dec 3, 2011

I am working on a program that will take in a string of length 7 containing either R,G or B for the colours. The program will then check that the string if 7 in length and if it contains any other characters than R, G or B then it will be invalid. I created this code but when I enter the right string length and characters it always gives me the error for not having the right string length.

Private Sub get_cars()
Dim Letter As String
Dim valid As Boolean
Dim position As Integer
txtPosition.Text = position
[Code] ......

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Create An Empty String That Is A Certain Length?

Jan 31, 2011

How can I create an empty string that is a certain length?

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