Updating A Text Box After A Com Port Command?
Jan 7, 2011
I created a form which I communicate with a Programmable logic controller through the Com Port. I have successfully sent commands to it and it has responded with the correct response. For example if i send the command CR through the Com port It comes back CC.I have put a timer that checks the text box for the com port response The problem is that the check box ticks if CC is put in manually into the textbox but once it is sent from the com port it don't automatically do it when the textbox refreshs. How can I refresh the textbox so that it ticks the box after a automatic change of text. I have also tried the textchanged method.
View 4 Replies
ADVERTISEMENT
Apr 22, 2012
looking for a way to detect all available AT Command ports on connected USB Mobile Modems.
I've tried messing with WMI a bit, but was only able to detect the HSBC ports, not the AT Command Ports which is nessassary to issue AT commands to the modems.
View 2 Replies
Jul 14, 2010
I am currently writing a console code that I will eventually create with a GUI. The problem I am currently having is that when a message I received to the port is an ASCII command code i.e. <BEL> <CR> then rather than printing these messages
it performs the command and I am unable to respond as per when the command is received. Is there a way to alter the code so I can see these messages or at least determine its been sent so I can respond to it?
View 5 Replies
Aug 27, 2009
I am using VB 2008 Express, connected to a MS Access database for some reason my update command is not updating my database.i may have something wrong [code]whats wierd is when i change UpdateCommand to SelectCommand, it will update the database, but it makes other things in my program malfuncation, so i cant have that as SelectCommand, there must be a way to have it all work with the Updatecommand ..
View 4 Replies
Mar 10, 2011
I am working on writing a program that needs to send a command to a specific port on the same computer, I have that working fine. There is another piece of software running that is listening to that port for some commands (read on).
Dim myTcpClient As New TcpClient
myTcpClient.Connect("127.0.0.1", 61225)
Dim networkStream As NetworkStream = myTcpClient.GetStream()
However when I try to send a command I get no response...
Dim outStream As Byte() = System.Text.Encoding.ASCII.GetBytes("0x33")
networkStream.Write(outStream, 0, outStream.Length)
networkStream.Flush()
I have been given a list of protocols that I need to send to that port. What I have been told is that the size (in byes) is 1 and the value is "0x33" with no parameters. I am completely new to sockets and sending data through tcp.
View 7 Replies
Aug 29, 2010
I want to make a program that sends an AT^ command to a port The AT^ Command is
AT^CARDLOCK="TEXT IN TEXT BOX 1"
View 4 Replies
Aug 16, 2009
I use visual studio 2008 with an access database.I can read the data just fine, but when I try to update the database, I get an error:"Update requires a valid UpdateCommand when passed DataRow collection with modified rows."[code]The spaces indicate different parts of the code, but I just left out the non relevant parts.
View 1 Replies
Apr 23, 2011
I'm running into the following error message when I click the button event: Command text was not set for the command object. [code]
View 1 Replies
Dec 21, 2009
If I comment out MdiUpdate() this run fine. When I run it with MdiUpdate I get the following Error...
da.Fill(ds,
"Mdi") Command text was not set for the command object.
I have also taken the code from the select statement and put it into the other 2 (replace the CliendGroupID = 3) and it works fine
Here is the code:
Public
Class NewFileInput
Dim inc As Integer
[code]....
View 2 Replies
Sep 28, 2009
I have an issue with a data base updating it won't update for me in debgging mode it is stopping here on this bit of code which is highlighted in red. the error which comes up is .(update requires a valid update command when passed datarow collection with modified rows.)
Public Sub UpdateDataSource(ByVal ChangedRows As database.dataset1)
Try
'The data source only needs to be updated if there are changes pending.
If (Not (ChangedRows) Is Nothing) Then
[CODE]...
View 1 Replies
Apr 10, 2011
I have a device that is continuously sending text over a TCP port and I want to write a VB.net application that will read and evaluate this data. Being new to programming I am having trouble working out how to establish a connection to this TCP port and read the text using VB code. I am able to view this stream of data using telnet.
Most of the example code I have seen during my research seems to deal with two way communication but I think what I need is just one way (I don't need to send any commands to the device - just read what it is sending). I'm hoping some kind person can provide example code to get me started or point me in the right direction?
View 3 Replies
May 29, 2009
I am completly flummoxed!!! I have writen code for updating my table from a form but when I use the same code only changing the table names it wont work I get the following message: "Update requires a valid Update Command when passed DataRow collection with modified rows" My codes are as follows:
[Code]...
View 5 Replies
Jul 21, 2011
i want to print text to the printer port. what is mean invalid handle parameter name:handle ?
code is
Public Class Form1
Public Class Win32API
Public Const GENERIC_WRITE = &H40000000
[Code]....
View 3 Replies
Oct 13, 2009
i cannot read data from my serial port..i am using HYPERTERMINAL on my other computer(computer 2)..i can send data from my computer(computer 1) and it showed on computer 2..but when i type things into my HYPERTERMINAL in computer 2, the Visual Basic program cannot read it??this is my code:
[Code]...
View 6 Replies
May 29, 2010
I've got a program which acts as a schedule for sporting events.The program allows users to fill in event details and they get saved into a directory for the selected date and venue, and in it are text files with the details, and then on another page is a listbox containing all of these directories so that the user can view saved events, and the page retrieves the details from the text files and displays them how I wanted it to.BUT, my 'update' feature just will not work.
basically, I want the user to be able to change the details and press 'update' which will then write the new information to the relevant text files, BUT i get this error in debug mode:
The process cannot access the file 'C:Events PlannerSaturday, May 29, 2010 testvenue.txt' because it is being used by another process.
The code I'm using is below, and from what I've learned, and how I've already coded this program, it should work right?
Code:
Dim venueReaderUpdate As System.IO.StreamReader
venueReaderUpdate = _
My.Computer.FileSystem.OpenTextFileReader(ListBox1.SelectedItem + "venue.txt")
[code].....
View 5 Replies
Apr 23, 2008
I'm trying to receive data from the serial port and display onto a text box in my gui in vb. I'm using xp pro sp2 and vb 2008 exp.What i've done so far:
- I'm able to send data successfully (tested) to the serial port
- I can dispaly what data is being sent (tested)
Steps taken:
- I have looked around on this forum for something similar to what I have but no similar posts are here
- Will look into MSDN help shortly
- Will also try some vb books I have lying around. But the problem is most of the vb books deal with sql server and database stuff and not really interfacing to hardware.
View 1 Replies
Apr 30, 2010
First let me say that I am not sure whether or not this should go in this section or the API section, and if it needs to be moved I apologize. My issue is fairly straight forward, but for some reason I cannot get it to work.
I am trying to send a command to a command line and then submit the command. I have been trying without success to get this to work in v2008 Express and v2010 Express, Here is the code I am trying to us:
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" ( _
ByVal lpClassName As String, _
ByVal lpWindowName As String _
[Code].....
View 6 Replies
Mar 23, 2010
I have a dialogue texttbox to enter new texts, what code shall i use in my MainForm so that the panel control- systems.windows.form.panel (which I have on the mainform) gets updated with the text which i entrred in the dialogue box text field.
View 4 Replies
Apr 19, 2010
I have a windows form which contains a textbox.I have a loop in my code doing some farly intensive work. In the middle of the loop I want to update my text box.text property on the form to let my users see some simple progress.
View 7 Replies
Mar 15, 2009
I am writing an app that reads from the com port, filters the data, then writes to the text box, then immediately starts over. This all takes place in an endless " do while" loop within the "start" button code. I also have a end button too which closes the com port and ends the program. Some other buttons are present also to change the filter settings.Problem is when I click start, data is logged, but none of the other buttons work. Also some of the text boxes are "see through" and dont look like thy have updated with the rest of the form.
View 9 Replies
Jan 16, 2009
I'm trying to copy to the clipboard a text that is read from the serial port, but when try to use:
Clipboard.SetText(MyTexo,MyText Format) give me the follow error: Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it.
Im using VB.Net 2008 and is a single form program. What could be wrong.
View 1 Replies
Dec 19, 2011
I'm trying to read a string(what's going on) from my Arduino and display it in either a label or text box. but its not wanting to display the characters, or string i want it to. So I could really Here's the code I have right now:
Imports System.IO
Imports System.IO.Ports
Imports System.Threading
[code].....
View 14 Replies
Nov 27, 2010
I'm mohammed from Oman ,I'm visual studio.net programmer How I can Read the Data From Barcode Weight scales By Serial port and TcpIp port
View 7 Replies
Jul 25, 2011
I have a Windows form.in windows form have a combo box that give me a list of available port serial with it code (Dim ports As String() =SerialPort.GetPortNames())for example( Com1,Com8,Com15,...).but I want to give me fullname of serial port in device manager for example in dvice manager is these (Comunication Port(COM1) - Printer Port(LPT1) And USB Serial Port(COM8)).how to Get it?
View 2 Replies
Mar 16, 2010
I have a ProbationComboBox with the SelectedValue bound to a RegistrationBindingSource, and the DisplayMember bound to a ProbationBindingSource. [code]
View 2 Replies
Jan 17, 2012
I have a simple Sub:
[code]...
It's job is to scroll the textbox (txt_folderactivity) after I update the text box with a new entry. The textbox is multi-line, so this keeps us at the bottom so we can see the new stuff. This sub gets called whenever any of the other subs add a line for things like file rename, deletion, etc. based on file system events (using Public watchFolder as FileSystemWatcher).I had a crossthread issue with just updating the textbox, but I wrote in a Delegate /Invoke for that and it works fine (something I found online earlier this morning), but now I have another issue and I'm not sure how to work it.
I'm getting a crossthread issue with this specific Sub specifically at the SelectionLength, and I'd like to set it up with a Delegate and Invoke and such, but I don't know how specifically. I've searched and read, but I don't get it. Do I need a seperate invoke on each of the 3 lines, or is there an overarching Invoke for the whole bit I'm still new-ish to VB and I don't know how to proceed. I've read some MSDN pages and stuff, but they aren't explaining what the problems is really and what I need to do (or prehaps I'm just not getting it).
View 6 Replies
Mar 8, 2012
Windows Forms, VB application... Forgive me in advance for this very elementary question but I am overlooking something really simple here. I would like to have a label show the current value of a variable as the for each loop runs.. I created a very simple Button Click event to figure out where its failing. As it is right now the value does not display until after the for each loop finishes running, which it should actually display the counter value each time it runs through... I know this is possible and really simple because I did it years back but for the life of me cant figure out why I am missing the bar as it should constantly update the label to reflect that?Test Sub is as follows:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim counter As Integer = 0
For x As Integer = 1 To 200000
[code]....
View 2 Replies
Jan 20, 2010
I am able to load a dataset with records from a sql database. I then loop through the data using a for loop, this works fine. As part of the loop I would like to update the contents of a textBox.text property. The problem is that it will only update the text field when the loop is complete. How can I update the text content for each record in the loop? I hope this makes since.
View 5 Replies
Apr 16, 2012
I am creating a quiz game and I am having the users initials and scores saved to a text file. I then want a messagebox to display the text file.
I have two major problems.
1) I can get the text file to add a new line each time, but the message box displays all the text in one line.
2) The first entry in the messagebox is "form1" even though that isn't in the text file anywhere.
[Code]....
View 7 Replies
Jun 9, 2010
I would like to detect the Address and Port number of the Parallel Port in computer.
View 4 Replies
