Ensure Connection To POSPrinter Connected Via COM
Sep 8, 2009
I need to make sure that the connection to a POS printer is successful before writing data to the database and then printing a receipt. The POSprinter is normally of type BTP 2002NP but may differ. The common thing is that they are all connected via COM-port and NOT usb, so no drivers installed at all on the client. Can I send some kind of "ping" on a COM-port and check if a device is connected and turned on? Additional information, the application is developed in VB.net and Visual Studio 2008
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Nov 10, 2009
I am trying to find out if the connection of my sockets (TCPClient) is connected or not connected. I am using the following code:
[Code]...
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Nov 17, 2011
I Receive Many UDP Connection From None IP Valid Devices With This Code:
receivingUdpClient = New System.Net.Sockets.UdpClient(Port)
Dim byteBuffer As [Byte]() = receivingUdpClient.Receive(RemoteIpEndPoint)
Now I Want Response Data To Device After Receive Data. I use This Code
receivingUdpClient.Send(receiveBytes, 10)
But Received This Error :
"The operation is not allowed on non-connected sockets."
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Dec 27, 2011
I am Using Visual Basic 2010. I want to check My Connection Status. Connected or not in Remote Server Connection (SQL Server 2008 R2). How To Check Connection Status..?
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Sep 22, 2011
I've searched the forums but never seems to find an answer for this one.. I recently connected to MySQL database server "Automatically" in Visual Studio 2010. I want to know if there's a way to determine the connection state for "Automatically created" connections in Visual Studio 2010. I know how to do it for"programmatically created" connections but just want to know how on the auto-generated ones.
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Jan 12, 2010
I'm trying to connect a remote mysql database. I'm doing it from a vb.net 2005 application with a connector mysql.data.dll What's happening is, suppose if I try to connect thrice it connects twice and once throwing an exception that says A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. there's nothing wrong with the code, otherwise it would never have connected
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Jan 6, 2012
I need to print a simple receipt to my EPSON-TM-T88V thermal POS printer with VB.NET 2010 on XP (eventually to run on Windows embedded POSReady) via USB.All I need to print is some text and a logo. I have my logo stored on the printer. So, I need to use Epson's ESC/POS commands. So, does it make sense to use Microsoft.PointOfService? Seems like a lot to go through to send some escape sequences to a printer!Apparently, the PointOfService system has not been updated to work seemlessly with VB.net 2010 (details below) That is why I wonder if I am taking the wrong path.IF this is the right path...here is what I did and where I am stuck.
For people trying to us the PointOfService classes in VB 2010:First you need to download and install the POS.net (Microsoft.PointOfService) - free download MS. Then you need to add references in your vb.net project. When you try to run it, you will probably get an error something like this:
{"This method explicitly uses CAS policy, which has been obsoleted by the .NET Framework. In order to enable CAS policy for compatibility reasons, please use the NetFx40_LegacySecurityPolicy configuration switch.
[code]...
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Apr 4, 2011
On my program I am trying to make a ToolStripStatusLabel's text change to "connected" if connected to a network and if not connected to a network change the text to " Not Connected" then I don't know how to display a image if connected to a network or not connected. So if the computer is connected to a network I have a image that I would like to be displayed next to the ToolStripStatusLabel. And if not connected to a network, can the program display a different image? I tried this:
My.Computer.Network.IsAvailable=True(ToolStripStatusLabel2.Text "Connected")
My.Computer.Network.IsAvailable=False(ToolStripStatusLabel2.Text "Not Connected")
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Jun 11, 2011
Say if you had two private subs on a form, how do you ensure the first sub called has completed it task before the second is run.
[Code]...
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Feb 20, 2010
I have a problem with ensuring no duplicates. I have an Appointments form (frmAppointments) and within it exits 4 date time pickers. The first 2 date time pickers are dedicated to creating an appointment date whilst the other 2 are for the purpose of changing an existing appointment date. When the date and time is entered into either one of the pairs (of date time pickers), the values inside get transferred to 2 corresponding textboxes. The user then clicks Save (btnSave) and the values are saved to sql.
How can I ensure no duplicates (of the date and time) can be created?
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May 20, 2009
I am having a small 'head banging' experience working on one of our DLL products.The problem I am having is that this application is an outlook addin, and as such, does not own its own Message Pump. No problems there, I have a UI class, which starts a thread, and calls Application.Run(new fControlForm)
I use the Application.Run passing a form, rather than an ApplicationContext purely because I want this form to be in charge of displaying other forms: ie, I can use BeginInvoke to ensure that a second, and many more forms are created in the context of the thread that owns the Message Pump.
I however feel this to be quite hackish. I get a form displayed at startup (which I am sure I can hide if I needed to)My question: IS there any way to create some form of Invoke procedure in an applicationContext that uses the Message Pump thread? I have created a class which implements the ISynchronizeInvoke and can Invoke from a thread that it owns, however this is not the same as invoking from the Message Pump owner.
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Jul 11, 2010
How can I ensure that a user enters data in one text box before being allowed to move on to the next text box Example I have four text boxes the user can enter a grade in. I want to lock the other three box until the user has entered a number in text box 1. Once a valid number has been entered in text box 1, that releases or enables text box 2. Once a valid number has been entered in text box 2, that releases or enables text box 3. And once a valid number is entered in text box 3, that releases or enables text box 4.
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Feb 3, 2011
So when that code run the program don't switch.Say I want to
Open a file
Write something
Close a file
Way when I open a file, another thread want to open that same file. That means open a file get executed twice.
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Sep 30, 2011
I have a screencasting program where it takes 10 screenshots every second and saves it to a temporary directory then through ffmpeg the series of images are compiled into a video format. My problem is that due to the computers processing power or the size of each screenshot and its quality it sometimes takes longer than 100 Milliseconds to create one causing the whole video to be off balance. How can I ensure 100% that 10 Images will be stored?
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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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Feb 10, 2010
I have a WCF service being hosted in a Windows Service (using techniques discussed here) and it works great. I'm now writing a (VB.Net) frontend app that needs to call that service, but I don't want my users having to fiddle around with the services snap-in and starting the service manually. Can I write some code to ensure the Windows Service is started, or start it if it isn't?
Edit: OF course, I can ensure the Service startup is set to automatic, but it doesn't need to be running all the time, and even then the frontend app still needs to be sure the service is running and start it if it isn't.
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Sep 5, 2008
how to ensure that a process created via the diagnostics.process class goes away when my app does. My app starts two processes, one runs plink and one runs psftp. Due to reasons that I don't want to become the focus of this post it is possible that my app will shutdown in an ungraceful manner. When this happens the psftp process dissapears but the plink process remains left behind. See the code below for how I am creating these processes.
Code:
Public Sub New()
Try
p = New Diagnostics.Process
'p.StartInfo.FileName() = "plink"
[code]....
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Oct 6, 2011
Please take a look at the code below. I was told by the individual that developed itoriginally that the code only adds the rows of data the user entered. In other words,there 5 rows of textboxes. user can enter data into one row or into all 5 rows. If the user enters data into one row of textbox, that's what gets inserted into the db.I made some minor change to the code so that users can tell when a payment is made by check or cash payment.Since I made that change, whether a user enters data into one row or all 5 rows, all 5 rows get inserted into the db.How can I modify this code to ensure only rows entered get inserted?
For x = 1 To 5 Step 1
dedval = obr.FindControl("ded" & CStr(x))
chckvalflag = obr.FindControl("chck" & CStr(x))
[code].....
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Mar 10, 2011
I have the following code which is part of a PA Call system: The 'SetPTT' nd 'DisableZones' statements set controls on the form where the code is. The LAPG2Coms.SetZones command starts another project within the solution to control an external controller. What I can't understand is why it executes the LAPG2 statement before SetPTT or DisableZones. The LAPG2 statement for messages is in the PlayMessage Procedure
[Code]...
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Nov 25, 2011
I need to ensure that the user can only click the button (to acknowledge the message) and not do anything else (like clicking another button). How can I do that?
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May 8, 2011
I'm trying to find out how to ensure a font is found by a project.I would expect to be able to add it (Them) to the recourses but can't find how to do that.When I get to 'Add item' I've tried 'New' and 'Existing' but can't find a template for fonts, so I'm lost (again).
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Mar 6, 2012
I have a listbox that is sorted and the data table that is bound to it is also sorted. I am trying to add a Record to this data table and ensure that it is always at the end of the list. Is there a way to do this using specific character combination?
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May 7, 2009
I need to ensure 2 calls are enlisted in a transaction
[Code]...
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Sep 24, 2009
I've written a small program that monitors the customer field in Quickbooks and query's a database to determine if there are any important notes for the selected customer. This works fine however, I either need the messagebox or a form to come to the front of all open windows on the system to inform the user that the selected customer needs to be reviewed.
How can I ensure that a form (or messages box) that opens in my program comes to the front of any and all application windows that are open?
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May 6, 2012
How can I ensure my app fully compatible with x64 Win7 platform? I have a choice of 32 or 64 bit development machines to use.
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Mar 7, 2011
I have an application that opens a Excel file into a form using AxWebBrowser.Navigate. This works fine unless there is another Excel file open before I run the application, in which both excel files are opened in the same Excel application which then causes problems.
How can I ensure the AxWebBrowser.Navigate opens a New Excel application?
Imports Microsoft.Office.Interop.Excel
Imports Microsoft.Office.Interop.Owc11
Imports System.Runtime.InteropServices
[Code]....
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Sep 7, 2011
I have an application that gathers information from a user into a Win.Form and then uses the Process.Start() to start Notepad and then using Sendkeys write the Notepad document.Sometimes this works great and sometimes the Notepad window is not started as the foreground process and the document is not written.What is the best way to ensure that the window opened by Process.Start("Notepad.exe") is the active window for the duration of the Process?
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Oct 17, 2010
How can we ensure that an NUD has a value DISPLAYED if the user deletes its contents?
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Feb 14, 2012
I have a MultiThreading issue and conceptual question using Visual Basic (but it applies to almost all languages). [code]...
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Apr 17, 2010
I have a form (formA) which contains a tabcontrol with two tab pages. Each tabpage has 6 textboxes and 3 comboboxes. In addition to the tabcontrol there is a separate combobox and textbox. The question I have, is how to best ensure that all these fields are populated with text and or numbers? From this a start button is pressed which generates another form (formB) which requires the fields from (formA). If for instance 1 or more fields is not populated, then generate a message to show the user which 'box' requires data. Only when all fields are populated will this enable the 'start' button.
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