I'm having a bit of an issue with this program I have been working on for my class. It's a future values calculator, that takes a single data type, decimal data type and a integer data type does the formula and then spits back out the Future value. What i'm having difficulty with is converting the string over.
Public Class Form1
'Define the Module level variables
Dim FutureValueInteger As Integer
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For the code below I get an error for the 1 to 5 part. It says end of statement expected. Is the way i've set out the syntax wrong, e.g the 1 to 5? [code] Also other than storing text to a rich text box what else can store numerical data in multiple lines?
View 6 RepliesSuppose I want to write a function like the following (as usual, a trivial example for illustrative purposes):
Public Function calcSqSum(Of T)(ByVal list As IEnumerable(Of T)) As T
Dim sumSq As T
For Each item As T In list
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As you can probably guess, this function causes an error because a generic object is not guaranteed to implement the + operator. As far as I know, though, any numerical type (Integer, Double, Decimal, etc.) will.
Is there a way to write a (quasi-)generic function that can accept any numerical type, without having to explicitly overload the function for every such type yourself?
Alternatively, I suppose an equally acceptable solution would be to somehow check if a type implements the '+' operator (or any operator generally associated with numerical types and used by the function).
what code i could use to convert american number 1-10 to roman numericals. It says i have to use a select case statement to identify which roman numeral is the correct translation of the integer.
View 12 RepliesIs there a way to USE the input from your microphone and speech recognition to convert the tone and frequency of a voice into a number and then match it against a database for a single spoken word. When ever I type voice recognition it just gives me how to listen to what someone is saying i have source code for that but I want to create a verbal authentication for my house. That way only certain people can give commands for the wireless modules to turn stuff off. and if some random person says off or something of the nature it wont just turn shit off, also im goign to make it into a verbal password system for my email.
View 5 RepliesIn VB.NET I would like to create a complicated data structure with multiple types of data stored in an array like format (see below). I am trying to create a data structure that would look something like this: [Name; xLoc; yLoc; zLoc; [Jagged Array]] Note: Name needs to be dimensioned as a string, xLoc and so forth as integers. The Jagged Array would look like this:
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I have a jagged array.
vb
Dim jaggedarray(numColumns)()
Does this accept multiple data types?
I'm trying to get the results of a SELECT SQL query from Data.OleDb.OleDbDataReader.Item Are there any better ways of approaching this?
I am checking for empty string values, but how do i see for the Quantity text box if the user chose only numerical values after the empty string. For example...
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I freely admit that I tend to avoid using API calls as much as possible I wish to use this API call
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Converting types between .Net and VB6?
View 2 RepliesIm getting that error in the da.Fill(ds)
Imports System.IO Imports System.Data.SqlClient
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I'm studying for the MCTS exam 70-536 and have come across the following question:Given the following Visual Basic code sample, which interface must the custom class MyClass implement?
Dim a As MyClass, b As Boolean
a = 42
' Convert using ToBoolean.
b = Convert.ToBoolean(a)
Console.WriteLine("a = {0}, b = {1}", a.ToString, b.ToString)
Before even looking at the possible answers, I can't get past WHY on earth would we be converting the number 42 to a Boolean value?? I tried this and as I suspected it did NOT compile! Is this a trick question or am I missing something? I realized that in order for the code to work, I would need to implement one of the interfaces shown in the multiple choices. STILL, would there EVER be a purpose for this particular conversion?
I'm trying to wrap up a program I wrote in VB.NET and quick. I have a device that I am connected to through a serial port (COM4). It sent me 1056 binary bytes which I have stored in an array called newRecievedData. (see code below)
********** Start Code*********
Dim numberOfBytesToRead As Integer
numberOfBytesToRead = myComPort.BytesToRead
Dim newRecievedData(numberOfBytesToRead - 1) As Byte
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A colleague has written a useful tool. He wrote it as a standalone tool, but it works even better as an includable dll, though it needs a bit of other functionality for it to be a really good drop-in component. What I am wondering is whether a project can be compiled as both an exe and as a dll?
There are alternatives, such as having a dll version and an exe version, since the dll version needs to include a few different methods that the exe version doesn't need, but this alternative sucks, since it would mean changing two sets of code.
Another alternative is to build the dll, then change the exe to be a project that references the dll....and does nothing other than calling one method in the dll. That kind of sucks, too, but not as bad.
I want to be able to use his module in some of my programs, and it really should be built as a component rather than a standalone app, but I want to know whether there are other options that I haven't considered.
I'm not sure if i titled this question properly or am asking it properly, but here goes.I've got serialized objects (in XML) stored in a database, along with a string/varchar indicating the type.
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I'm a complete novice with VB and any coding in general, but as life will have it, I have to create a program for my Final Year Project at university.In short, the idea is to open a file that has many lines of numerical data, then select the required lines, do some calculations on them and write it into a new file, but the new file must have its own format and the calculations must go into the correct lines.
Im struggling really with how to get it to read the file and then write the new one. Currently I have it so the user can open the file and it will display the data into a text box. I want to then be able to click another button that will convert that data into a new type, and in turn display that in another text box. Then have a save button to save the newly created data. This is what I have so far...(it's not much.I havent really got much of a clue what I am doing lol)
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I wonder how can I extract numerical data from a column of a list view and sum every and show in a label?
View 1 Repliesthis list has tried to mix numerical variable, such as 1, 2,3 within an xpath expression. [code] For some reason, item_ number_ first and item_number_last appear to have no value in the above code snippet, when they do have values they get printed as in the [code]Could anyone please give me some hints on what to modify here to make the numerical data be able to mix within my xpath?
View 2 RepliesI wish to extract numerical data from a text file and plot the data on a graph using the Zengraph classes. Each record has five variables.
I attempted to use the split function but failed to successfully get past one record.
1) How does one create an array or arrays using a text file containing many records, each with five distinct variables?
2) Is it better to create a number of single-dimension arrays or create one multi-dimensional array?
3) Is it easier to somehow convert a text file to an Excel file, with each variable in its own cell and each record on one row?
I have a USB device that is "seen" as a COM Port. It has eight channels, each require a single character to turn ON/OFF. It's a DLP-IO8 for reference. I have the COM port part working 100%.
1-8 turns ON each channel (12345678)
Q-I turns OFF each channel (QWERTYUI)
Truth table for device:
1 = Ch1 ON | Q = Ch1 OFF
2 = Ch2 ON | W = Ch2 OFF
3 = Ch3 ON | E = Ch3 OFF
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a loop that I can still use the functions of the form (change speed or Stop loop).
a way to utilize Q-I to turn the channels OFF in random mode
I've been searching for a few days with little luck. I've tried Do Until, Do While loops and a few others.
I've only been coding for a few days now so go easy. Learning as I go. My form for reference
Ultimately I'm trying bring my PC Interface project up to date by going from a parallel port to USB.
I have managed to format a text box to be formatted to two decimal places, and to only accept numbers.Only problem is i need to allow the backspace so that if someone types something wrong, they can backspace and type the correct number
Private Sub txtCAmount_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtCAmount.KeyPress
'Allow only numberical input plus decimal.
Dim allowedChars As String = "0123456789."
[code]....
I have a USB device that is "seen" as a COM Port. It has eight channels, each require a single character to turn ON/OFF. It's a DLP-IO8 for reference. I have the COM port part working 100%.
1-8 turns ON each channel (12345678)
Q-I turns OFF each channel (QWERTYUI)
[Code]....
I am not sure I am doing this correctly,I want to get a multiple number of file types (gif, jpg, png, etc.) and store them in one variable so I can access all the files in that var. I read that GetFiles doesn't allow for multiple patters, so how do I do this so I can have more than one file type in a variable?
Dim aryFiGif As FileInfo() = di.GetFiles("*.gif")
Dim aryFiJpg As FileInfo() = di.GetFiles("*.jpg")
Dim aryFiPng As FileInfo() = di.GetFiles("*.png")
So you know how PHP internal functions usually return a boolean FALSE when a function fails, or some other data type when the function succeeds? Is this possible in VB .Net?For instance, lets say this simple code here Public Function TrySomething(ByVal Param As String) \what would go here??
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You see I want to return a BOOLEAN false when a function fails, and a string when the function works. I've looked everywhere, and when I search for "return multiple types" all i find is Tuple.
I am in the process of converting some c# code to that of VB.NET...I am running into error at the following
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NOTE: I am mixing VB and C# - snippets come from different librariesI have a VB class definition as follows:
Public Class Session(Of TConnectionBuilder As {DbConnectionStringBuilder, New}, _
TConnection As {DbConnection, New}, _
TDataReader As {DbDataReader})
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I have a series of documents (Crystal reports, Excel workbooks, Word documents, PDF documents) that I need to print out in a collated order, but it seems that each application runs on its own thread and the documents don't come out in the order I intend.Is there a way of using VB.NET code to (a) control the order in which the documents are published; and (b) compelling the system to wait until one document is complete before starting the printing of the next one in the sequence?LDC
View 1 RepliesMy brain is fried at the moment, so here's the scenario.I have a form that adds a member to my VB.NET application.When I press submit I add their details: name and number as well as what products they want (internet and phone). Internet and Phone are their own class as is member.
I want to add that they HAVE whichever they have chosen and with the member store it.
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As what happens is once the member is created (stored) I will go to input how much they have used, and then store that. But to do so I will need access to the internet and phone classes, which are associated with said member.
My quest is in regards to xml serialization. I need to get rid of the root node of a collection. I don't have access to my source now so I'll just try to generalize
public class SomeClass
'...some other properties...
<XMLArray(isnullable:=true), _
<XMLArrayitem(datatype:=(getType(object1)), _
[code]....
I am using a structure array with multiple member names with 2 types. My question is can you single out one of the member names and add its total? kinda like this...
HTML Code:
structure structureName
dim a as string
dim b as double
dim c as double
[code].....