Dim input as String = Console.ReadLine()
Console.ReadLine() will read the console input from the user, up until the next newline is detected (usually upon pressing the Enter or Return key). Code execution is paused in the current thread until a newline is provided. Afterwards, the next line of code will be executed.
Dim x As Int32 = 128 Console.WriteLine(x) ' Variable ' Console.WriteLine(3) ' Integer ' Console.WriteLine(3.14159) ' Floating-point number ' Console.WriteLine("Hello, world") ' String ' Console.WriteLine(myObject) ' Outputs the value from calling myObject.ToString()
Console.WriteLine() method will print the given argument(s) with a newline attached at the end. This will print any object supplied, including, but not limited to, strings, integers, variables, floating-point numbers.
When writing objects that are not explicitly called out by the various
WriteLine overloads (that is, you are using the overload that expects a value of type
Object, WriteLine will use the
.ToString() method to generate a
String to actually write. Your custom objects should OverRide the
.ToString method and produce something more meaningful than the default implementation (which typically just writes the fully qualified type name).
Dim x As Int32 = 128 Console.Write(x) ' Variable ' Console.Write(3) ' Integer ' Console.Write(3.14159) ' Floating-point number ' Console.Write("Hello, world") ' String '
Console.Write() method is identical to the
Console.WriteLine() method except that it prints the given argument(s) without a newline attached at the end. This method can be made functionally identical to
WriteLine by adding a newline string to the end of any arguments provided:
Console.Write("this is the value" & Environment.NewLine)
Dim inputCode As Integer = Console.Read()
Console.Read() awaits input from the user and, upon receipt, returns an integer value corresponding with the character code of the entered character. If the input stream is ended in some way before input can be obtained, -1 is returned instead.
Dim inputChar As ConsoleKeyInfo = Console.ReadKey()
Console.ReadKey() awaits input from the user and, upon receipt, returns an object of class
ConsoleKeyInfo, which holds information relevant to the character which the user provided as input. For detail regarding the information provided, visit the MSDN documentation.
Module MainPrompt Public Const PromptSymbol As String = "TLA > " Public Const ApplicationTitle As String = GetType(Project.BaseClass).Assembly.FullName REM Or you can use a custom string REM Public Const ApplicationTitle As String = "Short name of the application" Sub Main() Dim Statement As String Dim BrokenDownStatement As String() Dim Command As String Dim Args As String() Dim Result As String Console.ForegroundColor = ConsoleColor.Cyan Console.Title = ApplicationTitle & " command line console" Console.WriteLine("Welcome to " & ApplicationTitle & "console frontend") Console.WriteLine("This package is version " & GetType(Project.BaseClass).Assembly.GetName().Version.ToString) Console.WriteLine() Console.Write(PromptSymbol) Do While True Statement = Console.ReadLine() BrokenDownStatement = Statement.Split(" ") ReDim Args(BrokenDownStatement.Length - 1) Command = BrokenDownStatement(0) For i = 1 To BrokenDownStatement.Length - 1 Args(i - 1) = BrokenDownStatement(i) Next Select Case Command.ToLower Case "example" Result = DoSomething(Example) Case "exit", "quit" Exit Do Case "ver" Result = "This package is version " & GetType(Project.BaseClass).Assembly.GetName().Version.ToString Case Else Result = "Command not acknowldged: -" & Command & "-" End Select Console.WriteLine(" " & Result) Console.Write(PromptSymbol) Loop Console.WriteLine("I am exiting, time is " & DateTime.Now.ToString("u")) Console.WriteLine("Goodbye") Environment.Exit(0) End Sub End Module
This prototype generate a basic command line interpreter.
It automatically get the application name and version to communicate to the user. For each input line, it recognize the command and an arbitrary list of arguments, all separated by space.
As a basic example, this code understand ver, quit and exit commands.
The parameter Project.BaseClass is a class of your project where the Assembly details are set.