SerialPort1.DataReceived Does Not Fire
Sep 10, 2009
I was perhaps too quick to think that VB's built-in event would be be easy to use. As you can see from my previous post I am building a program which sends and receives a few bytes from serial bus. The bus is actually a usb serial adapter, there are no real serial buses in my machine.Anyway that SerialPort1.DataReceived does not fire. It is from visual studio/vb ide so syntax should work? Here is my start up code. There are many comments, because I tried various combinations.
If Not _serialPort.IsOpen Then
If Not arvo = "" Then
_serialPort.DtrEnable = False
_serialPort.Parity = Parity.None
[code]....
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Apr 11, 2010
I'm trying to do a basic function, I'm using Visual Basic 2008 express, I have a windows form with 1 textbox, 1 button and a serial port. When the button is pressed serialport1 is opened then the data received is trimmed to remove unwanted char from start and end and then is displayed in the textbox, when the button is pressed again the port is closed, this works fine but in debug mode I get a cross thread error, telling me I can't use textbox1.text=result
[Code]...
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Apr 11, 2010
I'm trying to do a basic function, I'm using Visual Basic 2008 express, I have a windows form with 1 textbox, 1 button and a serial port. When the button is pressed serialport1 is opened then the data received is trimmed to remove unwanted char from start and end and then is displayed in the textbox, when the button is pressed again the port is closed, this works fine but in debug mode I get a cross thread error, telling me I can't use textbox1.text=result
[Code]...
How can I mod this code to get rid of the error?? It's been suggested to me to use BeginInvoke or Invoke but i'm not sure how to use this can someone
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Jul 21, 2009
Im using VB express 2008 (compiled with .NET 3.5) to write a program that communicates with a USB device. The USB device is a communication class device and thus will emulate the usual rs232 serial port once attached to the PC. The USB device sends a fixed number of bytes and i have set the threshold received byte property to this value. I have run the program and it seems to read the USB device "correctly" but when i debug the code, i realise that the datareceived event of the serial port gets fired on the eventtype = EOF. I am using the Read function to read the bytes from the serial port and the Newline property is set to "" (but i thought that this is irrelevant if im not using ReadLine). When the datareceived event fires with EOF, the Read function blocks until one byte arrives, reads it and calls the function that processes the data. I went through the forum and realised that the EOF eventtype is no longer supported, is this true? I dont think that getting this eventtype is logical anyways in my case.
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Dec 3, 2009
I'm looking for a reference that can explain the concept and use of the DataReceived event and Delegates subject.The reference has to be pretty simple as I'm an "old dog attempting to learn a new trick". I'm not ignorant of things programming, but am ignorant of things dealing with serial communication in VB2005.I already have a couple of O'Rielly books ("VB2005 Cookbook", "VB2005 Desktop Reference") and I have a book that deals with serial communication from a Jan Axle-something. Neither O'Rielly books have any info, and the Axle-someting book's remotely related examples are too confusing for this slow learner.
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Jun 15, 2011
I've managed to make an application at home using a serialport emulator and connector that will read text from a file on my desktop send it to com1 and then my connector program will merge com1 with com2. In short my program works at home but when I connect it to my device it appears the data in DataReceived is a fraction of what my simulator setup at home is producing, which apparently is completely normal according to all these threads I've read here.
[Code]...
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Apr 2, 2009
When I write a byte array to a device using this code, the DataReceived Event never fires.....
[Code]...
AND if the sleep is <40, the event doesn't fire. Is this necessary or am I overlooking something?
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Dec 29, 2010
Every 5 to 10 seconds I receive 5-12 bytes of data (confirmed w/Hyperterminal). I can open the com port(btn1), read bytes(btn3) until bytes to read = 0, but then i'm stuck; the data received event doesn't seem to respond. If I close the serial port(btn2), re-open i can read more data until bytes to read = 0 then stuck again. I tried several suggestions for threads and delegate and invoke but none worked. (WIndows XP, VB 2008)
[Code]...
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Jun 29, 2011
I am trying to get a fairly simple Serial Port program working. So simple in fact I have been bashing my head over it for quite a while.
I have a piece of equipment connected over a null modem cable. When turned on, it just starts spitting data out RS232 and I need to capture it. Hyperterminal does see the data so the USB-serial converter is working.
When I run the code snippet included, the port opens fine, but the DataReceived event never fires.
Imports System.IO
Public Class Form1
Dim WithEvents serialPort As New IO.Ports.SerialPort
[Code]....
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Jul 8, 2011
I have an application with serial port datareceived event. My instrument sends me aprox.00bytes every 1 second. Which I then process and update few textboxes on the main formRecently my application started crashing if I press close button.I am guessing form_closing closes serialport at the same time datareceived event triggers in which the sp1.bytestoread causes the crash.1. I added synclock in datareceived and in form_closing.Within synclock in form_closing I removed datareceived handler.
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Dec 16, 2010
So I just spent the last 4 hours trying to find out what was wrong with my code, just to find out that there's a bug in this version or I just don't have enough knowledge of VB2010 (I'm coming from VB6, this is my first program on 2010)I removed the rest of the code just to point out the problem, here it simply tries to enable the Timer1 when you receive data in the SerialPort1
Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
If Me.Timer1.Enabled = False Then
[code]....
After this I found that the code inside the Timer1 didn't run when the 100miliseconds passed, so I added a msgbox to see debug.
Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
If Me.Timer1.Enabled = False Then
[code]....
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Dec 1, 2009
I need an event that fires every second, just like the timer1_timer() event of VB6. I'm using VB9/Silverlight, creating a small sidebar gadget.
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Mar 1, 2011
I am trying to add one item to the ItemContextMenuDisplay for Outlook 2007 list. I can not get the event to fire however.m initializing my new class on startup. As far as I know, the only way to trigger that event is to open outlook; I have tried putting a Debug.Print() statement on startup instead, but nothing prints.
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Jun 22, 2010
When entering a value in dgv I want the Tab key to fire a routine. Works out ok only thing is I have to hit the Tab twice before it fires. Don't know why, is there a way to prevent it, so that I have to hit the Tab key only once ?
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Jan 29, 2009
Key Down event won't fire
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Nov 17, 2009
I created a control that inherits from treeview. When I add it to my project the afterselect event does not fire.
<code>
Public Class TreeViewClaims
Inherits System.Windows.Forms.TreeView
End Class
</code>
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May 27, 2011
I have a menu on my aspx page which looks beautiful. It's exactly what I need (found it here).
Problem that I have is this: I need (somehow) to kick off a button control from the javascript. I realize that in the example, the menu items are simply href links, but I'm wondering how I could possibly do a postback and kick off my Button1_OnClick event.
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Jan 19, 2012
This is my very first trigger and I'm not sure I have it set up correctly. I have a table called PayTypes. Here is my trigger syntax:
[code]...
I run this with a breakpoint on the first line, update my VB.NET datagridview (which updates and saves just fine), but the breakpoint never gets hit. Am I going about the setup of the trigger incorrectly?
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Feb 15, 2012
This is my very first trigger and I'm not sure I have it set up correctly. I have a table called PayTypes. Here is my trigger syntax: ALTER trigger payTypes_trigger on PayTypes AFTER INSERT, UPDATE, DELETEs PRINT 'AFTER TRIGGER EXECUTED SUCESSFULLY' I run this with a breakpoint on the first line, update my VB.NET datagridview (which updates and saves just fine), but the breakpoint never gets hit. Am I going about the setup of the trigger incorrectly?
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May 16, 2010
When i clicked one of the node of treeview, it does not fire SelectedNodeChanged event.
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Aug 29, 2009
How do I fire an event from a background thread I created onto the main thread in a class in vb.net?
I've searched A LOT fot this, but could only find non vb.net examples, mainly C#, and have not been able to translate these.
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Feb 16, 2010
I have a windows service in VB.NET 2008 and want to fire an event every hour on the hour within the service?
I have this working in an application were i assign the current hour to a variable and check each minute if the variable has changed. Is there a cleaner way of achieving this in a service?
I also want the service to read this in form an XML file i have modified from a service control app can i use app.config for this as i've read your not supposed to write to this file?
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May 18, 2009
I have a modal popup that has a targetId to a hidden button. I want the popup to occur when a button in a grid is clicked but that button is programmed behind the code and therefore the targetId would be invalid. So I wanted to attempt to set the gridview's button's onclientclick event to be the onclientclickevent of that hidden button. Is this possible or should I be going about this another way.
Here is how I created the grid button
If Not IsPostBack Then
Dim field As New TemplateField
field.HeaderText = "Sub Departments"
Dim col As DataControlField = field
GridView1.Columns.Add(col)
[Code] .....
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Nov 30, 2011
I want when user press down arrow key then its work like user press tab key i use this code but its not work and system doesn't give any error.
protected override Function ProcessDialogKey(byval keyData as Keys) as boolean
Dim Key as Keys=Keydata and Keys.keycode
key = Keys.Down then
return Mybase.ProcessDialogKey(Keys.Tab) 'Its not working
else
return Mybase.ProcessDialogKey(keyData)
endif
end subArt Of Living Is Art Of Giving
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Jul 8, 2011
I have a problem with SQLDependency I have took an example from msdn and changed it a little to my purpose but somehow it seems the event never fires up. What I did until now is
1. changed the database owner
2. enabled broker
3. also my query is fine i'm including the shema name.
Here's my code
[Code]....
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Mar 23, 2010
Im not sure of the dll to use for fire fox instead of using VB's Default web browser or if there is a way to use firefox in vb2008. If there is please let me know. I would rather use the fire fox in a program instead of the default that is internet explorer web browser.
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Nov 29, 2009
I have this function that totals a series of textboxes everything works fine except the last line, i need to call the function a second time for the correct total of last line,anyone have any ideas what i am doing wrong? I even tried to make the last line its own function and call it seperately but have the same behavior.
[Code]...
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Jun 6, 2012
After i upgraded my project, i get this :'UPGRADE_WARNING: Event Text1.TextChanged may fire when form is initialized.And when i run project, it fires and do bad stuff, what can i do?
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Mar 25, 2010
I am trying to drag and drop items from a listbox into a richtextbox? I can not get the .DragDrop event to fire? I have copied and past the code from [URL]
I can get the .DragEnter event to fire. The mousedown event fires the drag and drop, is there something for mouseup?
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Apr 11, 2011
I have little problem. I change the textbox value in pageload time. the textbox change event calling automatically. how to stop that?
[Code]....
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