Aquariums Visual Basic Programming Blog

Microsoft.VisualBasic.DateAndTime Syntax TimeOfDay Return Value Date value giving the current system time Description Sets or returns the current system time Example The code: TimeOfDay( ) = #9:05:13 AM# sets the system time, and the code: MsgBox(TimeOfDay( )) displays the current system time. Rules at a Glance The TimeOfDay property returns the time in the time format defined by the system’s regional settings. Programming Tips and Gotchas The TimeOfDay property includes an incorrect date, 01/01/0001, along with the time. It can be eliminated with the Format or FormatDateTime function as follows: Format(TimeOfDay( ), “Long Time”) FormatDateTime(TimeOfDay( ), DateFormat.LongTime) When setting the TimeOfDay property, any date component is ignored. See Also Now Property Timer Property Class Microsoft.VisualBasic.DateAndTime
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Description Returns the hyperbolic tangent of an angle Rules at a Glance This is a Shared member, so it can be used without creating any objects. VB .NET/VB 6 Differences Tanh is new to the .NET Framework. See Also Cosh Function, Sinh Function Throw Statement Syntax [Throw exception exception Use: Required Data Type: An Exception object or an object derived from Exception An Exception object representing the exception being thrown Description Throws an exception that can be handled using either structured exception handling (a Try. . . Catch block) or unstructured exception handling (the On Error statement) VB .NET/VB 6 Differences The Throw statement is new to VB .NET. See Also Exception Class, Try…Catch…Finally Statement TimeOfDay Property Class

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Return Value A Double containing the tangent of an angle Description Returns the ratio of two sides of a right angle triangle Rules at a Glance The returned ratio is derived by dividing the length of the side opposite the angle by the length of the side adjacent to the angle. This is a Shared member, so it can be used without creating any objects. Programming Tips and Gotchas You can convert degrees to radians using the following formula: radians = degrees * (pi/180) You can convert radians to degrees using the following formula: degrees = radians * (180/pi) See Also Cos Function, Sin Function Tanh Function Class System.Math Syntax Math.Tanh(number) number Use: Required Data Type: Double or numeric expression An angle in radians Return Value A Double denoting the hyperbolic tangent of the angle
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If the column argument is omitted, the text-insertion point will be moved to the beginning of the next print zone. The value of column determines the behavior of the insertion point: Value of column Position of insertion point Current column > column Moves one line down to the column column. column > Output Width Uses the formula column Mod width. If the result is less than the current insertion point, the insertion point will move down one line; otherwise, the insertion point will remain on the same line. < 1 Column 1 The left hand column is always 1. When expressions are output to files using the Print or PrintLine statement, the width of the output is determined by the Width statement. When output surface is divided into columns, the width of each column is the average width of all characters in the current point size of the current font. This means that the number of columns for tabulation purposes does not necessarily relate to the number of characters that can be printed across the width of the output surface. Programming Tips and Gotchas The Tab function without a column argument is useful when outputting data to a file using the Print or PrintLine statement especially in locales where the comma would be recognized as a decimal separator. See Also Spc Function Tan Function Class System.Math Syntax Tan(a) a Use: Required Data Type: Double An angle in radians
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End Module Programming Tips and Gotchas To determine the CTS data type of a particular variable, pass the variable as an argument to the TypeName function, and pass its return value as an argument to the SystemTypeName function. For example: strType = SystemTypeName(TypeName(myVar)) The existence of the SystemTypeName function clearly indicates that VB .NET data types are wrappers for CTS data types. VB .NET/VB 6 Differences The SystemTypeName function is new to VB .NET. See Also TypeName Function, VbTypeName Function Tab Function Class Microsoft.VisualBasic.FileSystem Syntax Tab[(column)] column Use: Optional Data Type: Short A column number to which the insertion point will move before displaying or printing the next expression Return Value A TabInfo structure Description Moves the text-insertion point to a given column or to the start of the next print zone Rules at a Glance

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Type: String The name of a VB .NET data type Return Value A String indicating the name of a CTS data type Description Returns the name of the Common Type System (CTS) data type that corresponds to a particular Visual Basic data type Rules at a Glance vbname must be the name of a valid VB .NET data type, such as Boolean, Byte, Char, Date. Decimal, Double, Integer, Long, Object, Short, Single, or String. If vbname is not a valid VB .NET data type, the function returns Nothing. If vbname does not directly correspond to a CTS data type, the function returns Nothing. For example, user-defined types created with the Structure construct and classes created with the Class construct both return Nothing if their data type names are passed to the function. Example Public Structure Point Dim x As Integer Dim y As Integer End Structure Public Class CEmployee End Class Module modMain Public Sub Main ‘ Returns System.Int32 Dim i As Integer = 100 Console.WriteLine(”Type of i: ” & SystemTypeName(TypeName(i))) ‘ Returns Nothing Dim o As Object Console.WriteLine(”Type of o: ” & SystemTypeName(TypeName(o))) ‘ Returns Nothing Dim oEmp As New CEmployee Console.WriteLIne(”Type of oEmp: ” & SystemTypeName(TypeName(oEmp))) ‘ Returns Nothing Dim uPt As Point Console.Writeline(”Type of uPt: ” & SystemTypeName(TypeName(uPt))) ‘ Returns System.String Dim sName As String = “This is a string.” Console.WriteLine(”Type of sName: ” & SystemTypeName(TypeName(sName))) End Sub
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Syntax SyncLock expression …[ code ] End SyncLock expression Use: Required Type: Any reference type (class, module, interface, array, or delegate) An expression yielding a single result that can be used to determine the accessibility of code code Use: Optional The code statements to which access is synchronized and that will be executed sequentially Description Prevents multiple threads of execution in the same process from accessing shared data or resources at the same time Rules at a Glance SyncLock blocks a thread’s access only if that thread belongs to the same object instance. Programming Tips and Gotchas The SyncLock statement wraps a call to the BCL’s System.Threading.Monitor.Enter method. The BCL includes a number of other synchronization mechanisms, all of which are located in the System.Threading namespace. VB .NET/VB 6 Differences The SyncLock statement is new to VB .NET. VB 6 provided the developer with no direct means of controlling threads of execution in applications or components. SystemTypeName Function Class Microsoft. VisualBasic.Information Syntax SystemTypeName(vbname) vbname Use: Required
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The initial cost of the asset salvage Use: Required Data Type: Double The value of the asset at the end of its useful life life Use: Required Data Type: Double The length of the useful life of the asset period Use: Required Data Type: Double The period whose depreciation is to be calculated Return Value A Double giving the sum-of-years depreciation of an asset for a given period Description Computes the sum-of-years’ digits depreciation of an asset for a specified period. The sum-of-years’ digits method allocates a larger amount of the depreciation in the earlier years of the asset. Rules at a Glance life and period must be expressed in the same time unit. For example, if life represents the life of the asset in years, period must be a particular year for which the depreciation amount is to be computed. All arguments must be positive numeric values. To calculate the depreciation for a given period, SYD uses the formula: (Cost-Salvage)*((Life-Period + 1)/(Life*(Life + 1)/2)) See Also DDB Function, SLN Function SyncLock Statement
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Example The GetTextColor function uses the Switch function to return an RGB color value that depends on the sign of the integer passed to it as a parameter. To access the Color structure, it imports the System.Drawing namespace of the Base Class Library. Private Function GetTextColor(lValue As Integer) As Integer Dim fColor As New Color Dim iColor As Integer fColor = Switch(lValue > 0, Color.Blue, _ lValue = 0, Color.Black, _ lValue < 0, Color.Red) ' Convert color name to RGB color and strip out ' high order byte of high-order word iColor = fColor.ToArgb and &H00FFFFFF GetTextColor = iColor End Function Programming Tips and Gotchas The Switch function can prove to be an efficient alternative to If...Then...Else statements, but it can't be used in situations where multiple lines of code are required to be executed on finding the first True expression. Programming Tips and Gotchas Switch does not use short-circuiting. That is, even though it returns only the first True expression, it evaluates all expressions. As a result, Switch will generate a runtime error if any of these expressions are invalid. See Also Choose Function SYD Function Class Microsoft.VisualBasic.Financial Syntax SYD(cost, salvage, life, period ) cost Use: Required Data Type: Double

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arguments without parentheses. VB .NET features a standard calling syntax in which arguments are always enclosed in parentheses. See Also Function Statement Switch Function Class Microsoft.VisualBasic.Interaction Syntax Switch(expr-1, value-1[, expr-2, value-2 … [, _ expr-n,value-n]]) expr Use: Required Data Type: Object A number of expressions to be evaluated value Use: Required Data Type: Object An expression or value to return if the associated expression evaluates to True Return Value An Object value or expression Description Evaluates a list of expressions and, on finding the first expression to evaluate to True, returns an associated value or expression Rules at a Glance A minimum of two expression/value pairs is required; additional pairs are optional. Expressions are evaluated from left to right. If none of the expressions is True, the Switch function returns Nothing. If multiple expressions are True, Switch returns the value that corresponds to the first True expression. value can be a constant, variable, or expression.

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