[2008] Opening A Virtual Com Port?
Jan 23, 2011
I need to communicate with a BlackBerry cell phone, so that I can query the current signal strength using Hayes AT commands, and store is into a file, along with my current GPS position.
I already got it to work perfectly using HyperTerminal:
- I installed BlackBerry Desktop Manager and I leave it running on the PC (otherwise it does not work!)
- I connect my BlackBerry Bold cell phone to the PC using a USB cable.
-The cell phone appears on the PC as a Virtual Com port, in my case it shows up as "COM13".
- I open HyperTerminal and connect to COM13 at 115200 bauds, 8 bits, 1 stop bit, hardware flow control
- If I type "AT" + ENTER, the phone answers "OK"
- If I type "ATI1" + ENTER, the phone answers with its model number "Platform: X.X.X.X, App version: X.X.X.X, PIN: XXXXXXXX"
- If I type "AT+CSQ" + ENTER, the phone answers with the current signal quality value "+CSQ: 21,99".
In theory it should be a piece of cake to query my phone using a serial port routine in VB.NET. The problem I have is that VB.NET allows me to read data from a REAL COM PORT, but refuses to read anything from a VIRTUAL COM PORT. When opening "COM13", I get "The given port name does not start with COM/com or does not resolve to a valid serial port. Parameter name: portName".
I did a lot a searching on Virtual Com Port on the WEB, but everything I see allows me to create a virtual com port. I only want to read an existing VIRTUAL COM PORT, not create a new one.So, I do I actually open a VIRTUAL SERIAL PORT, so that I can send the "AT+CSQ" command and receive my cell phone signal strength value using VB.NET?
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Aug 19, 2010
How do you create a virtual serial port using vb.net
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Feb 25, 2009
I wrote a program that uses the following class from that site: VB.NET Tutorials - Serial Port Communication In VB.Net. The problem is that I cannot open a virtual serial port, and the second is that I want to make the communication asynchronous.
This is the subroutine which reads from the port:
#Region "comPort_DataReceived"
''' <summary>
''' method that will be called when theres data waiting in the buffer
''' </summary>
''' <param name="sender"></param>
[Code] .....
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Jan 10, 2011
I have a few USB devices that use standard Microsoft Virtual COM Port drivers. More specifically, I believe they use the "Usbser.sys" driver. Whenever I plug my USB devices in, they always shows up in the Device Manager as a COM port, however, sometimes I am unable to open that COM port. This problem occurs on both Windows XP SP3 and windows 7 machines (The only operating systems I have tested this on).
To be a little clearer, I can plug my USB device in, and then successfully open the COM port. I unplug my USB device, then plug it back in, and I am unable to open the COM port. The only solution to this problem is to restart my PC. Is there any solution in VB.net to reset any entrees made to the Windows system when the USB device is plugged in? Has anyone come across this problem and resolved it via a VB.Net solution?
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Feb 12, 2009
In Form1 there are a lot of boxes like checkbox, label....I want to show a processing message for opening serial port after program running. So I created Form2 specifically showing "Opening Port...". So in Form1_Load() I used Form2.Show(). However this message showed behind of Form1. I think this was executed before all the other tool boxes loading. So where should I put Form2.Show()?
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Jul 4, 2008
I'm writing an app with takes 3 readings off LCD displays via serial ports. The module which scans the serial ports is getting stuck in a loop for around 1.5 seconds. I need it to be much quicker than that. Is there a way I can setup a virtual serial port so I can run test it on my PC. Its very tedious and time consuming of making changes and visiting the machine its for.
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Mar 26, 2009
I've been struggling with writing my own Ethernet to serial program and just about to give up since I'm down to the wire on this project. I keep getting intermittent errors and I just can't get around them.
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Oct 25, 2010
Trying to read data through the virtual COM port created by bluetooth.
The original console program (and the trimmed version below) was designed to read data from serial port COM1 and output the data to notepad. The program works; hook the bar code reader to COM1, activate bar code reader, swipe card, bar code reader beeps, data input collected from COM1 and sent out to notepad.
The problem: Bluetooth is wanted instead of serial cable.
We disconnected the serial cable, we connected a USB bluetooth receiving device onto the XP. XP installed the bluetooth device drivers 'Generic Bluetooth Radio' and 'MS Bluetooth Enumerator'. Bluetooth detected the bar code reader device and created COM5 outgoing SPP slave and created COM6 incoming.
But now; activate bar code reader, swipe card, bar code reader beeps, NO data input collected from COM5.
[Code]....
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Aug 13, 2010
I am writing a small app that is retrieving data from a device connected to a virtual com-port. I connect without problems to the device using the settings 9600-8-N-1.
I need to send the command <esc>MS , the device then sends back the data to a computer. I have tried this using Hyperterminal with success. I also did this with Excel and VBA. I used the MSComm32 Active X control:
MSComm1.Output = Chr$(27) + "M" + "S" + Chr$(13)
Msgbox(MSComm1.Input)
This made the data from the device pop up in a messagebox. I am writing a winforms app in vb.net, using VS2005. I have a form, on which I have a Placed a SerialPort control, named sp. My sample code is as follows:
Private Sub Form1_Load(ByVal
sender As System.Object,
ByVal e
[CODE]...
This returns the error message "Error: expecting a command". I have done som tests in HyperTerminal, and have concluded with:
-If I dont send <esc>, I get error "Expecting a command"
-If I send wrong command (ie MD instead of MS) i get error "Bad command"
Based on this, I suspect that I don't pass the escape character correctly to my device. So I wonder how to do this?
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Dec 21, 2010
Is there any other way to access a serial port using visual basic.net 2010? I followed the steps in this site, [URL] but I just got this output Open the serial port. Send the attention command to the modem. Wait for data to come back to the serial port... and stopped there. I can't get the Read the OK response data in the serial port. Close the serial port. And I was thinking, because it is very much easy to access serial port in vb6, so can I just use vb6 and then connect to visual basic.net? it is like a language inside a language.
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Mar 23, 2009
My current project is a program that collects meteorolgical data on one computer and allows to access it from any other computer on the net.Everything is working fine so far - it is collecting the data, doing some computation and then listening (as server, TCP) on some port for a client who is interested in downloading this data.When it receives some short command string (something like "GET DATA") it just starts sending the data to the client. The transmission works.
At this point I am getting a bit nervous because I absolutely have no idea on the programming basis of viruses and other malware:When the program is listening on the port (for which I have to allow an exception in the firewall) is there any danger that malware from outside intrudes into the computer?(running Windows XP with latest service packs installed, firewall enabled, antivirus-program installed (is this necessary if there is absolutely no internet activity on the computer besides of this data sampling / server program?)).
If there is danger, what could I do to protect the computer aside from closing the port which I need for communication with the external world?Can you point me to some URL where I can alleviate my ignorance of the basics of malware functioning (on the software level)?
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Sep 14, 2011
i have a listview in virtual mode loaded via the cachevirtualitems and etrievevirtualitem. now i want it to be filtered as we type in the textbox...Please suggest as to where to filter this...here is the code used to load the items...
Private Sub ListView2_CacheVirtualItems(ByVal sender As Object, ByVal e As System.Windows.Forms.CacheVirtualItemsEventArgs) Handles ListView2.CacheVirtualItems
[code]....
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Oct 20, 2011
Hey guys I am developing a project in which I need to create kind of like a virtual mouse within the form that can move around the form and click buttons and such without taking control of the person's mouse.
is this possible to do
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Mar 23, 2011
Is there an easy way to just ping a server by IP or URL and return the minimum, maximum and average milliseconds? Actually the same results I get in CMD when using the ping command. Can't find any tutorial that describes it. So let's say I have a Textbox1 and a Button1 and a Label1 for the results. How can I do it?
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Oct 25, 2009
Ok basically what I am doing is using panels to create virtual "pages" within my application, and using buttons to switch from page to page. However whenever I click the button to move from page1 to page2, page 1 disappears and page2 does not become visible.
Private Sub page1_next_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles page1_next.Click
page2.Visible = True
page1.Visible = False
ToolStripStatusLabel1.Text = status_page2
End Sub
Also, how do I make it so that when the user focuses on a text box a tool tip pops up?
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Sep 4, 2011
i need to use virtual mode in a listview to load data from a table...what to add in the retrievevirtualitem event... i have a data bindingsource which is attached to the table..
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Jul 6, 2009
Am I on the right path I programmatically create, fill, modify, essentially communicate with a set of Datatables, etc within my app while never having an actual database (i.e. Access.mdb file) all residing in memory but never really existing in an '.mdb' file, for example?
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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
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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?
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Jun 9, 2010
I would like to detect the Address and Port number of the Parallel Port in computer.
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Mar 5, 2010
What i need to write is i get different signal from PIC16F877A and through serial port, i need to display diffrent text from different signal, Such as: Signal from portB.1 display 1, signal from portb.2 display 2. Between the microcontroller and serial port im using MAX232.
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Aug 2, 2011
If I uninstall the COM1 and reboot, it works. If I shut down (power off) and restart, I get the message below. If I uninstall then click on Scan for Hardware Changes,The given port name does not start with COM/com or does not resolve to a valid serial port. Parameter name:portName
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Apr 15, 2009
create code for my further reference and analysis.
[Code].....
moved to .net forum. :Moved to .Net forum. VB6 forum is for VB6, not .Net
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Apr 7, 2011
This is my Code
Private Sub ToolStripButton2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton2.Click
Dim OpenFile As New OpenFileDialog
OpenFile.FileName = ""
[code]...
Everything works but if i don't open a file it gives an error
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Aug 13, 2010
I've developed simple selection program which is now complete and in testing. The program has been sent to several users that have all experianced the same error when they run the program.T
PLATFORM VERSION INFO
Windows : 5.1.2600.196608 (Win32NT)
Common Language Runtime : 4.0.30319.1
[code]....
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Oct 20, 2011
I am trying to get my 4 port USB relay board to work in VB.net using the COM PORT. I found some code from a poster who has the 16 port USB relay version. When trying his code i can only get it to turn on relays 1-3 all at the same time. The product can be found here: USB 4 port relay
"01+//" - Relay 1 is switched ON
"01-//" - Relay 1 is switched OFF
"02+//" - Relay 2 is switched ON
"02-//" - Relay 2 is switched OFF
[code].....
So i am confused as to how to separate each relay out with that code above and just be able to turn on any number 1-4 relay on or off independently from each other!
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Jan 5, 2011
I am trying to access the parallel port and want to on off an LED connected to the parallel port. i have read from different tutorials and write the code. but it is not working.
vb.net
Option Strict Off
Option Explicit On
Module InpOut32_Declarations
[Code].....
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Jun 15, 2009
I am trying to get into some programming so have installed Visual Basic Express 2008 on an Vista Home Premium machine and can not get started at all.
When I open a new project (FILE>>New Project) I get some "visual Studio installed templates" Whenever I try any of them eg console application or Windows Forms application I get an error dialog box "Exception of type "System.Exception" was thrown.
I assume it is the templates that are not compatable or corrupted but I dont seem to be able to start without using the template.if it is the template or something else or how to start without using one of the installed templates?
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Mar 5, 2011
I have done some work in VB 2010 for school and the schools computers have VB 2008. is this going to be a problem? if so how can i fix it so i can open the work in vb2008 because thats where it will get marked.
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Sep 20, 2010
or saving VB 2010 project for VB 2008 use
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