Varying Display Results Based On Selected Device Class
Mar 15, 2012
I wanted to get your feedback on a design/coding issue. I have a treeview which represents the device tree in device manager. I also have two listviews which display information about the currently selected device on the treeview. I'm only concerned with the first listview at this point. The information displayed in the listview varies depending on the selected device. I'm using the node index to track which device class and device is selected and I pass this into the device class Display method. I hate the idea of a big Select Case statement. Then there is also the dynamic nature of the device tree to consider.
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Jul 11, 2011
I have to display the available times in a dropdownlist called "DDL_avalTime" based on the date selected in a ASP calendar.
How the program works is that when a User clicks a date form the caldendar, it checks the SQL database. In this case the table that I'm retrieving it from is "trainerbookings" from the column "trainingDateTime". The data type for this column is datetime.[code]...
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Jun 25, 2009
I have a group of three radio buttons. Depending on which radio button is selected, I want to disaply one of three controls - a textbox, a dropdown list, or a button. How do I display controls based on the result of a selected radio button?
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Jun 27, 2010
I am trying to display a record in my datagridview based on the value selected from a combobox. I tried the code below using SQL Management studio and it works perfectly.
[Code]....
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Apr 25, 2011
i want to display a certain section of my form based on the number selected by radio button.( scale 1 to 5) by default 1 is clicked . if they click 5 then the same portion will be repeated 5 times .i have the database table structure to support this . but how to code the radio button to do the same .
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Nov 15, 2011
I am trying to make a simple program to display a shipping charge based upon a selected zip code. Where can I find sample code that I can use as a guide? I can create the GUI but can't figure our the code.
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Dec 28, 2011
I have a number of unrelated subs and functions that do various things on my server (e.g. Lighting control, data caching, server maintenance, etc). They are all in various classes which I have coalesced into a single solution.My goal is to create a single, simple interface which each of these disparate classes can be integrated and called from a command line interface. Instead of hard-coding a longish case statement which parses arguments and passes them to the various subs, I wanted to make a generic class which can be instantiated with a minimum of information and put into a data structure. Ideally, adding a new function would involve:
1.) Providing the function pointer (Delegate). The delegates will have various signatures. This is the crux of the question.
2.) Providing ancillary info such as the command-line callable name, number of arguments, argument types, etc.
I have a 100% working class called "node" which is basically a hierarchical tree of node instances. I can use this to simply organize function calls in related branches. All is working quite well.NodeFunctionDelegate(ByVal args As String) As String.The node takes the arguments passed to it by the command line and sends it as the "args" string as comma-separated. The delegate function then needs to know how to split up these comma-separated values, type them, tryparse them and etc. It then must return some string.It works, but it involves writing a middle-man function stub which can receive the argument string from the node class, do the parsing and type checking, and then call the destination function.My goal is to eliminate this trivial middle-man function. The problem is, I can't figure out how to create a variable-signature delegate for the node class.
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Mar 31, 2010
I need to display 3 columns and a varying amount of rows (typically around 50) in a windows form, kinda like excel. The data will likely be longer than the window, so a scroll bar will have to come into play somewhere.
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Aug 19, 2010
This is my code to remove a file from a selected USB device:
Dim fileInfo As IO.FileInfo = CType(ListBox5.SelectedItem, IO.FileInfo)
My.Computer.FileSystem.DeleteFile(fileInfo.FullName, CStr(ListBox4.SelectedItem) & fileInfo.Name)
ListBox6.Items.RemoveAt(ListBox6.SelectedIndex)
But i keep getting this error:
Overload resolution failed because no accessible 'DeleteFile' accepts this number of arguments.
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Oct 25, 2005
No WIA device of the selected type is available.I'm using VB6, Windows XP SP2, HP ScanJet 5300c.Here's the code:
Dim objWIA As WIA.CommonDialog Dim objDevice As WIA.Device Set objWIA = New WIA.CommonDialog Set objDevice = objWIA.ShowSelectDevice(ScannerDeviceType, False) MsgBox objDevice.DeviceIDI get the error on the ShowSelectDevice line.
I have tested the scanner and it does work. I have contacted HP and they said this scanner is WIA compliant.
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Mar 19, 2012
I have created a database that allows me to sort through the hundreds of pictures I have based on certain criteria. The file path for each picture is stored in a text box in the database (file path). I am currently using this code to copy the files to a new folder:
My.Computer.FileSystem.CopyFile(file_pathtextbox.text, �E:photo_gallary�)
However, this only copies the first file in my query not all the others. I am at a loss as how to loop through them all so they all end up in their new destination.
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Apr 5, 2012
Everything I know about .Net programming tells me that the behavior I see here is completely impossible. Simple code:
Structure WKSTA_USER_INFO_1
Dim wkui1_username As Integer
Dim wkui1_logon_domain As Integer
[Code]....
When I put a break point in here, I see that after RtlMoveMemory, my wk1 contains a pointer to a username, and all the others are 0. This is consistant. Now, if I change Dim test As String = "" to Dim login As String = "" and run it again, wk1 contains pointers to both username and logon_domain.
If I change it to Dim login As String, it contains a pointer to only the username. Depending on what I change that (completely unused) variable name to, I get a different result.
I have always been under the impression that it cannot possibly matter what you choose to name your variable. And that declaring a variable, and then never using it, cannot possible be different from not having a variable there at all.
I've tried this on 2 computers, with consistant results (one on .Net 3.5 and one on 4.0). When I tried converting it to C#, however, I was not able to reproduce it.
I am aware, by the way, that I can just use System.Environment to get what I need about the current user information; this was old VB6 code that was automatically upgraded (and I've edited it a little to make it more trivial).
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Aug 18, 2010
In an application for a Storage company, I have a form with 107 buttons in five Group Boxes. Each Group Box represents a Building and each Button represents a Storage Unit. They are layered in Table Layout Panels, bottom TLP has 5 columns, one for each Group Box, each Group Box has a TLP with 2 columns and 10 rows, where each button is located. What I would like to do is change the color of any button based on the results of a query.
Buttons are called btn1, btn2, btn3..... Text on the buttons is 1, 2, 3, 4,.... I have a table for the buildings and one of the properties is "Available" set as an intger and is either 0(No) or 1(Yes). I have a query that I run on form load that returns the correct results, to test I put a DGV on a form and set the DataSource to the DataSet returned. Returned is the "Available" Buldings Number(1-107)[code]...
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Jan 9, 2011
Suppose I have a table with columns userdef1, userdef2 userdef6 and I have another table that defines these fields. i.e UserDef1 = "MyName" etc
What would be the best approach for retrieving these values and updating the column headers?
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Sep 8, 2011
I have a datagrid control with a list of names that it retrieves from a MySql database. I can search through them until i have one result. I want to be able to Display a groupbox control when the number of results is equal to 1. Also, in the groupbox i have a button that when clicked will delete this user from the server and their information from the mysql table called "employee". when the user is deleted i'll display a confirmation message in a messagebox, and reload the table with the updated list. so far the only two problems i have are showing the groupbox when the results are equal to 1 and deleting the user from the sql server based on the name of the search result
Private Sub TextBox1_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyUp
'Search Function.
[code].....
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Apr 9, 2011
I have the following LINQ-to-Entities query:[code]This will give me all the resident assignments for the current year/term. Then I have this LINQ-to-Entities query:[code]This will give me all the rooms. I want to iterate through the assignments and based on what room is assigned update the occupancy in reset_occupancy. I'm not 100% sure how to accomplish this. Here is my pseudo code of what I want to accomplish:[code]
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Dec 15, 2009
I have the following LINQ-to-Entities query:
' Get all the residency assignments that match the term/year.
Dim assignments = From p In dbContext.Residents _
Where p.semester = term _
[code].....
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May 12, 2011
I've created a program that requires students to answer addition questions.I have the code so that it calculates if the answer is correct, along with outputing the correct answer into a textbox.If the answer is correct the textbox background colour changes to green.If the answer is inocrrect the textbox background colour changes to red.I've done this using an array, and I want to use this array to calculate how many questions the students have answered correctly, and output them onto another page.I'm not sure is something like this would work:I was thinking about giving the textbox that outputs the grade score a value of 10. For every red box that is highlighted, 1 is taken away from the texbox value, outputting the amount of questions the user has answered correctly.Here is my array so far, not including the ability to output how many answers the student has answered correctly.
Public Num1(10), Num2(10) As Integer
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[code].....
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Nov 20, 2009
So basically, I am running through my selected path recursively and returning the results to an array.. I think.
vb.net
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim path As New FolderBrowserDialog
If path.ShowDialog = Windows.Forms.DialogResult.OK Then
Me.TextBox1.Text = path.SelectedPath
[Code] .....
I was told that to return the search to an array, I add the return toarray() at the end.
Now obviously Im not getting errors, but I am also not polling the results that are in fileslist.toarray(). I've looked at arrays quite a bit, I see their functionality if they are defined like myarray(4) with 5 declared array values... its an array with 5 value places. And to read from any one of the 5, you'd say something like msgbox(myarray(3)) to call the 3rd place in the array.
Well, as you can tell from the code, I am putting a variable amount of information into the array, How can I call that information? If I scanned a folder with 300 files, how can I call the results of that array and put them in a text file, or console, or messagebox through them? And assume I am doing it through a button click event. So, button click to read all input in the array to console or something like that.
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May 24, 2009
c# I want to display the bluetooth IP address of the smart phone or pda device that my software is on when a button is pressed in a message box.
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Mar 2, 2010
I have 20-30 devices that I am connecting to and gathering data from. I want to display six or seven lines of data for each device on the same screen, then allow the user to click the object containing the device and show more detail on a separate form. There aren't any other programmers where I work and am looking for advice on how most efficiently to implement this. I have tried TableLayoutPanels, Datagrids, Textboxes, ListBoxes and I am probably not implementing them right, but they don't seem to be getting me where I want to go. I am also trying to stay away from hardcoding objects onto the screen.
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Sep 28, 2011
I am writing a class library that envelopes an USB device driver. This device has its own class library, provided by the hardware vendor.
Very often, especially if you handle with old DLL or COM assemblies, there are methods (functions to be correct) that return TRUE if all was OK, or FALSE if any error happen. Often these methods return information about the error in one of their parameters or separately in a GetLastError method or even if in an OnError event.
Now, normally I handle all native .NET exceptions in my class libray handling locally or re-throwing to the client if the error is useful to know. But what to do with all other errors that are hidden in the vendor's methods? (in the true I have no exceptions, but only returned TRUE or FALSE values).
Let's make an example with the method "CONNECT" that connect the client to the USB device.
I envelope the method in this way:
Public Sub Connect()
oVendorDevice.connect()
End Sub
now if any connection error happen, the vendor's connect method return FALSE. But I do not know why the connection failed. To know why the connection failed I have to call (for example) the method GetLastError that gives me information about the error. (but do not forget that other vendors use other strategies like returning the error in a method's parameter or in a OnError events.
Now, in order to follow a good .NET exception handling strategy I could write something like this:
Public Sub Connect()
Dim res As Boolean = oVendorDevice.connect()
If res = False Then
[Code].....
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Mar 6, 2011
I would like to use the .NET FileSystemWatcher class to monitor a folder path which is located on a device currently connected to the host computer and is being managed by Windows Mobile Device Center. The environment is Windows 7 Pro, x64.
When connected to the PC, the device is listed under "Computer" -> "Portable Devices", and I can navigate to its filesystem from there. When setting the "Path" property of my VB .NET app's FileSystemWatcher class object instance, however, it only accepts a valid string-representation of a standard filesystem path (eg. c:somedir hisdir), whereas the address bar of a navigable portable device reads "ComputerPocket_PC";a value which throws an exception at runtime.
Am I able to use the FileSystemWatcher class in this context? How else could I get a PC app to monitor file activity on a handheld device while it is attached?
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May 8, 2011
I have combobox, listbox and textbox. Combobox has datasource datamember values assigned i would like to select a customer from a combobox and save the datarow based on that selected value to an array it could be a list or whatever created in memory as variable and this will be my listview Datasource. I understand within that current row there is ID value which is interger.[code]...
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Mar 12, 2012
I need to ba able to display the results from sql into a MsgBox and have the option Yes/No.
My SQl is : SELECT account FROM Ta Where cost=0.
this will return about 10-15 rows, i need to see te accounts with o cost befor i continue.
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Mar 17, 2010
[code]I have a listbox, 4 radio buttons,a textbox and a button. I want the user to type in a number into the textbox, click on 1 radio button(multiplication) and then click on the button to show the number entered into the textbox multiplied up to 3 times. [code]
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Mar 2, 2009
I can get the results if I plug a number in for i, but I get them as a string for some reason.
Private Sub displayButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles displayButton.Click
'display Fibonacci results
Dim fib(10) As Integer
Dim i As Integer
Dim fibn As String
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May 21, 2009
I am using a WCF to connect to my database. I have the code below, I am trying to select all the details from the database where the customernumber = what the user has entered on the form.However, I cannot return a dataset to the form as it sends in a string.
Imports System.ServiceModel
Imports System.Data
Imports System.Data.OleDb
[code].....
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Jul 14, 2011
I'd like to add a generic search feature to my WinForm application (Visual Studio 2010). I want the users to type in a value (for instance john), and then display a list of any company, contact, or student records that contain the search value in the name[code]...
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Jul 3, 2009
How can I delete a row from an SQL database based on what item is selected in a listbox?
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