VS 2008 Empty Input Buffer
May 22, 2010I am trying to empty my input buffer when I open up the serial port using this code but its not working any suggestions? Mainly just look at the last line [code]
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VS 2008 Handle Events Of Serial Input Buffer
Apr 25, 2010I want to handle the events of my serial input buffer. [code] My programming skills are not really that great so I've got a question:How can I trigger a sub (for example: ArduinoSerialInput) as soon as this event is handled? I've tried some code but without success, that's why I decided to post on the forum [code] I use a piece of hardware to send data to my COM port, but nothing happens.
View 7 RepliesDoes Reading Serial Port Empty Buffer
Feb 22, 2009Does reading the serial port empty the buffer?
View 2 RepliesHandle The Events Of Serial Input Buffer?
Apr 24, 2010I want to handle the events of my serial input buffer. I've seen the following article:
[URL]
My programming skills are not really that great so I've got a question:How can I trigger a sub (for example: ArduinoSerialInput) as soon as this event is handled?
Code:
Public Delegate Sub SerialDataReceivedEventHandler(ByVal sender As Object, ByVal e As SerialDataReceivedEventArgs)
Dim SerialBufferIn As SerialDataReceivedEventHandler = AddressOf ArduinoSerialInput
Public Sub ArduinoSerialInput()
MsgBox("test")
End Sub
I use a piece of hardware to send data to my COM port, but nothing happens.
Buffer Cannot Be Null - Parameter Name: Buffer
Dec 15, 2011[Code]...
This is my code for retrieving pictures, it was working before but then i accidentally deleted the table and i created it again with the same name and same fields. and now whenever i open the form with the picture, there was a message box error. it says Buffer cannot be null. Parameter name: buffer I don't know what i did wrong.
Checking If Dynamic Text Boxes Are Empty/ No Input When Saving?
Aug 8, 2011For example, I clicked the Add Text box button, so it added 3 text boxes in the form (I used Dynamic text box so it can add multiple text box). When I input data to one of those 3 text boxes and then Save button has been clicked. It should checked whether the dynamic text boxes are empty or not. If there are empty text boxes, then saving data to db should not be continued and display a message telling the user that empty field(s) are invalid.
In the code below, it saves the data even if there are empty text boxes and I think because it is in the for loop, it checks the text boxes one by one and repeatedly displays the message box that I coded.
Here's the complete code:
Imports System.Data
Imports System.Data.SqlClient
Public Class Form3
[Code]....
VS 2008 - ASCII To HEX Buffer Converting
Sep 16, 2009I found this function from the net. But I have a problem with the reply buffer. The reply buffer is in ASCII value...but I need is HEX value. Is there any way that the reply buffer is in hex?
[Code]...
VB, Windows 2008, Interactive User And Buffer Cannot Be Null?
Sep 5, 2010I have a web application on a Windows 2008 server. The web application opens another application interactively.The issue: If I am logged into the server, the web application runs without any problem. If I log-off, and try to use the web application, I get an error "Buffer cannot be null."If I log myself back into the server,go to another computer and try the web app, it will work fine.What security setting is causing this?
View 3 RepliesVS 2008 The Output Char Buffer Is Too Small To Contain The Decoded Characters?
Oct 25, 2010Dim r As New IO.BinaryReader(New IO.FileStream(path,IO.FileMode.Open))
While r.PeekChar() <> 0
End While
[code]......
VS 2008 : Empty A Collection In .NET?
Apr 11, 2010How can I empty a collection in .NET? Let me specify that I don't want to destroy the collection , I just don't want it to have the objects it had before (so I can refill it from scratch) .
View 3 RepliesVS 2008 - Empty Form On Startup?
Sep 26, 2009Im making a program that reads from an ini file and then prints it in the form I have a problem when Im trying to open the compiled file the form is just blanc and there isnt any text its like it isnt reading from my code
here is the code
Imports System
Imports System.Collections
Imports Microsoft.Win32
Imports icsharpcode.sharpziplib.zip
[code]....
VS 2008 - Show Only Row With Empty Column
May 17, 2009is there a way to show in datagrid only those row that has column that is empty, im using this code
Me.DataGridView1.DataSource = ds.Tables("0").Copy() but it shows all the data from my table.
VS 2008 : Check Column 0 Is Empty Or Has Some Value?
Jan 25, 2010What is the best datagridview event to use these codes I want to check column 0 is empty or has some value
If e.ColumnIndex = 0 Then
If DataGridView1.CurrentCell.Value = "" Then
MsgBox("Empty Value")
[code]....
VS 2008 : Hide PictureBox If Empty?
Oct 23, 2010How can i hide a picturebox if it contains NOTHING
Dim a As Integer
Dim PicString(26) As Image
Dim PicBox() As PictureBox = {Box1, Box2, Box3, Box4, Box5, Box6, Box7, Box8, Box9, Box10, Box11, Box12, Box13, Box14, Box15, Box16, Box17, Box18, Box19, Box20, Box21, Box22, Box23, Box24, Box25, Box26}
[code]....
This does not work... The PicBox(c) = Nothing ... is not a valid command.
VS 2008 Argument 'Path' Is Nothing Or Empty
Jul 20, 2009My app is functionally fine. Although, after the login, it throws up this error:
"Argument 'Path' is Nothing or empty". If I click continue, it proceeds without any problem. I looked up on msdn forums and realized that I need to add a valid argument 'path'. Here is the link to the msdn page I looked at:
[URL]
VS 2008 Delete Empty Folders?
Jun 16, 2010ive been searching round the net but the only examples i can find are for vb6 which i know nothing about, i want to be able to scan a folder and all sub folders with in it and delete any folders which are empty.
This is all the code ive put together so far:
vb Dim folder2scan as string = Folderbrowser.selectedpath
If IO.Directory.GetFileSystemEntries(folder2scan).Length = 0 Then
End If
VS 2008 Empty Form On Startup?
Jul 8, 2009Im making a program that reads from an ini file and then prints it in the form I have a problem when Im trying to open the compiled file the form is just blanc and there isnt any text its like it isnt reading from my code
here is the code
Imports System
Imports System.Collections
Imports Microsoft.Win32
[Code]....
VS 2008 FTP Upload File Empty?
Jul 20, 2010I am using VS 2008 to upload a zip file created earlier in the program, the ZIP file is created where expected on the FTP server but it is empty
View 2 RepliesVS 2008 Testing If An RTF File Is Empty?
Aug 29, 2010When listbox is added to by the user a number of empty RTF files are created and saved with a string variable SavePath1,SavePath2 and SavePath3. The user can then add date to 3RichText boxes and save the data. The data can then be cleared from the RichText boxes, anotheraddition to the listbox and fill the RTB and save. I need to trap the RTBs being filled and the clear button being pressed before the data is saved. To do this I need to test for empty files and tell the user the data has not yet been saved.
View 1 RepliesVS 2008 XML Write Empty Element?
Jul 26, 2009Im trying to create an empty element in an xml file but still want to be able to close other elements without changing the empty element.What XMLTextWrite does to empty elements:
<Data>
<Feed>
<EmptyElement />
</Feed>
<Data>
When i use the text writer i cant use <writer>.StartEndElement() it starts to screw with my empty element. When im still having my program write inside feed. Here some code your you to drool over.
My example
Dim Settings As New XmlWriterSettings()
Settings.Indent = True
[code]....
ProgressBar In 2008 Shows Only Full Or Empty, Never Anything In Between?
Feb 5, 2008I'm trying to add a progressBar to my form but it always shows full or empty, it never shows anything in between like 20%, 30% etc. Here is my
ProgressBar1.Minimum = 0
ProgressBar1.Maximum = 2
ProgressBar1.Step = 1
[code].....
Scan And Delete Empty Folders Using 2008?
Jan 6, 2008I am currently writing an application, where the user clicks a button, it scans for empty folders and then puts them in a listbox.The user can then then select the folders in the listbox and click delete. how to i get the scan button to find the empty folders?
View 6 RepliesVB 2008: Print Preview Remains Empty?
Apr 19, 2012I'm trying to understand why my print preview is not showing the contents of the file (I've double checked that the file is in the correct directory and is not empty)
Imports System.IO
Imports System.Drawing.Printing
Public Class Form1
[Code].....
VS 2008 Check If Datagridview Cells Are Empty?
Mar 4, 2011I've been searching around a lot to figure this out. I found some code that sort of works:
VB.NET
If String.IsNullOrEmpty(CStr(Me.dgvList.Rows(i).Cells(0).Value)) Then
End If
[code].....
VS 2008 Empty Values In Packets Disappear - TCP?
Jun 10, 2010Empty values in byte array at the end of one packet are replaced by beginning values of the next packet sent in TCP connection. How may I avoid this?
View 4 RepliesVS 2008 Listbox Delete Empty Lines?
May 11, 2009ive been searching the whols google, and i couldnt find a ny solution.. i was wondering if someone here can help me out, i am loading a listbox items from a .txt files, and sometimes there are empty lines, there is a way i can delete them?
View 10 RepliesVS 2008 Passing Empty Fields To SQL Table?
Nov 9, 2010I'm trying to add a service company from a vb form to an SQL table. It works as long as I enter something in every field on the form. If not I get a syntax error so I thought I should check that the field values were not null
I've tried to add a sub to check for blanks but it's not working
btw the table will allow nulls for all fields
Private Sub btnSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSubmit.Click
Try
[Code].....
[2008] - Deserialize An Empty Arraylist Collection?
Mar 6, 2009the vars outside the procedure
Dim rentalRecords As New ArrayList() ' The arraylist containing the records
Dim carRecords As New ArrayList()
Dim currentRecordIndex As Integer ' The index of the current record
[code]....
DataGridView - Convert Nulls To Empty Strings And Display It In The Grid As Empty Strings
May 14, 2009I have a DataGridView that has some columns with dates. It binds to an in-memory Datatable which gets loaded from an string array of data passed back from the backend Some of the rows returned have nulls for the date columns. Solution 1: If I define the Date column in the DataTable as "string" I can easily convert those nulls to empty strings and display it in the grid as empty strings (desired results). However, if the user clicks on the date column header to sort by date, it doesn't order the rows as you want. You get a purely string sort order. Not acceptable
[Code]...
VS 2008 - Inner Join Statement / Predicted Field Empty
Jan 5, 2011Here's a sub routine that fills a data set with a table which I queried using an Inner Join statement. This output table, has all the required fields and the query works fine. However I want it like so:
If a student doesn't have a StudentPrediction.PredictedGrade Field to JOIN and it IS Empty.. Then I still would like it to display the students information just leaving the StudentPrediction.Predicted field empty.
You see I am using a ListView to display the data from when I fill the ListView, but it will only display for people who have a Predicted Grade naturally. So what steps would I need to take to ensure it displays all the information in the Student's table AND for the students who do have predictions that would also be displayed. If the student has no data on PredictedGrades then that column would be blank but the rest of the information still displayed.
Private Sub FillDataset()
Dim ConString As String = ("Data Source=USERSQLEXPRESS;Initial Catalog=StudentTeacherDB;Integrated Security=True")
Dim QueryString As String = "SELECT Student.FirstName, Student.Surname, Student.Email,
[Code] .....