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Use: Optional Data Type: Long The number of characters in stringvar to replace string Use: Required Required: String The string used to replace characters within stringvar Description Replaces a section of a string with characters from another string Rules at a Glance If you omit length, as many characters of string as can fit into stringvar are used. If start + length is greater then the length of stringvar, string is truncated to fit in the same space as stringvar. This means that the length of stringvar is not altered by the Mid statement. If start is less than 0, runtime error 5, “Invalid procedure call or argument,” occurs. Programming Tips and Gotchas If string is Nothing, a runtime error occurs. VB includes the Replace function, which enhances the functionality of the Mid statement by allowing you to specify the number of times the replacement is carried out in the same string. Because it is a statement, this version of Mid does not accept named arguments. As a statement, Mid is implemented by the compiler, rather than by the Microsoft.VisualBasic.Strings class. See Also Mid Function Min Function Class System.Math Syntax Math.Min(val1, val2) val1, val2
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intEnd = InStr(intStart, strString, ” “) - 1 If intEnd <= 0 Then intEnd = intStrLen If blnLines And (intCrLf < intEnd) Then intEnd = intCrLf - 1 intCrLf = InStr(intEnd + 2, strString, vbCrLf) If intCrLf = 0 Then blnLines = False lstWords.Items.Add(Mid(strString, intStart, _ intEnd - intStart + 1)) intStart = intEnd + 3 Else lstWords.Items.Add(Mid(strString, intStart, _ intEnd - intStart + 1)) intStart = intEnd + 2 End If If intStart > intStrLen Then intStart = 0 Loop lstWords.EndUpdate( ) End Sub Programming Tips and Gotchas Use the Len function to determine the total length of str. Use InStr to determine the starting point of a given substring within another string. See Also Left Function, Mid Function, Right Function Mid Statement Syntax Mid(target, start[, length]) = string target Use: Required Data Type: String The name of the string variable to be modified start Use: Required Data Type: Long The position within stringvar at which the replacement commences length

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Use: Required Data Type: Long The starting position of the substring length Use: Optional Data Type: Long The length of the substring Return Value String Description Returns a substring of a specified length from a given string Rules at a Glance If str contains Nothing, Mid returns Nothing. If start is greater than the length of str, a zero-length string is returned. If start is less than zero, runtime error 5, “Invalid procedure call or argument,” is generated. If length is omitted or length is greater than the length of str, all characters from start to the end of str are returned. Example The following example parses the contents of a textbox control (named txtString) and writes each word to a list box (named lstWord). Note the use of the InStr function to determine the position of either a space or a carriage return/line feed character combination the two characters that can terminate a word in this case: Private Sub btnParse_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles btnParse.Click Dim strString, strWord As String Dim intStart, intEnd, intStrLen, intCrLf As Integer Dim blnLines As Boolean lstWords.Items.Clear( ) intStart = 1 strString = Trim(txtString.Text) intStrLen = Len(strString) intCrLf = InStr(1, strString, vbCrLf) If intCrLf Then blnLines = True lstWords.BeginUpdate( ) Do While intStart > 0

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Public Sub Increment( ) lCtr += 1 End Sub Public Function ShowCount( ) As Long ShowCount = ShowObjectValue(Me) End Function End Class Module modMain Public Sub Main Dim oCtr = New CCounter oCtr.Increment oCtr.Increment MsgBox(”Count: ” & oCtr.ShowCount) End Sub Public Function ShowObjectValue(oObj As Object) AS Object ShowObjectValue = oObj.Value End Function End Module Programming Tips and Gotchas The Me operator can’t be used on the left side of an expression. Me is particularly useful when passing an instance of the current class as a parameter to a routine outside the class. See Also MyClass Keyword Mid Function Class Microsoft.VisualBasic.Strings Syntax Mid(str, start[, length]) str Use: Required Data Type: String The expression from which to return a substring start

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Rules at a Glance If the two arguments do not have the same data type, then the narrower data type is cast to the wider type. For instance, the line: Dim x As Integer = 5 Dim y As Double = 454.8 MsgBox(Math.Max(x, y)) displays 454.8. This is a Shared member, so it can be used without creating any objects. VB .NET/VB 6 Differences The Max function is new to the .NET Framework. See Also Min Function Me Operator Syntax Me Description Represents a reference to the current class from within the class Rules at a Glance Me is an explicit reference to the current object as defined by the Class…EndClass construct. Me corresponds to the C++ this operator. Example In this example, a class passes an instance of itself to a function outside the class by using the Me operator. Private Class CCounter Private lCtr As Long = 1 Public ReadOnly Property Value Get Value = lCtr End Get End Property

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A valid string expression Return Value String Description Removes any leading spaces from str Rules at a Glance If str has no leading spaces, the function returns str unmodified. If str is Nothing, LTrim returns Nothing. Programming Tips and Gotchas It is unwise to create data relationships that rely on leading spaces, especially since most string-based data types in relational database-management systems (like SQL Server and Access) automatically remove leading spaces. See Also RTrim Function, Trim Function Max Function Class System.Math Syntax Math.Max(val1, val2) val1, val2 Use: Required Data Type: Any A numeric data type or expression Return Value Returns the maximum of val1 and val2, in the widest datatype of the two numbers Description Returns the maximum of val1 and val2

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Math.Log10(d) d Use: Required Data Type: Double A numeric expression greater than zero Return Value Double Description Returns the common (base-10) logarithm of a given number Rules at a Glance The common logarithm is the logarithm base-10. The common logarithm satisfies the equation: 10^Log10(x) = x d, the value whose common logarithm the function is to return, must be a positive real number. If number is negative or zero, the function generates runtime error 5, “Invalid procedure call or argument.” This is a Shared member, so it can be used without creating any objects. VB .NET/VB 6 Differences The Log10 function is new to the .NET platform. See Also Exp Function, Log Function LTrim Function Class Microsoft.VisualBasic.Strings Syntax LTrim(str) str Use: Required Data Type: String

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You can calculate base-n logarithms for any number, x, by dividing the natural logarithm of x by the natural logarithm of n, as the following expression illustrates: Logn(x) = Log(x) / Log(n) For example, the Log10 function shows the source code for a custom function that calculates base-10 logarithms: Static Function Log10(X) Log10 = Log(X) / Log(10#) End Function The inverse trigonometric functions, which are not intrinsic to VB, can be computed using the value returned by the Log function. The functions and their formulas are: Inverse hyperbolic sine HArcsin(X) = Log(X + Sqr(X * X + 1)) Inverse hyperbolic cosine HArccos(X) = Log(X + Sqr(X * X - 1)) Inverse hyperbolic tangent HArctan(X) = Log((1 + X) / (1 - X)) / 2 Inverse hyperbolic secant HArcsec(X) = Log((Sqr(-X * X + 1) + 1) / X) Inverse hyperbolic cosecant HArccosec(X) = Log((Sgn(X) * Sqr(X * X + 1) +1) / X) Inverse hyperbolic cotangent HArccotan(X) = Log((X + 1) / (X - 1)) / 2 See Also Exp Function, Log10 Function Log10 Function Class System.Math Syntax

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Class System.Math Syntax Math.Log(d) or: Math.Log(a, newbase) d or a Use: Required Data Type: Double A numeric expression greater than zero newbase Use: Required Data Type: Double The base of the logarithm Return Value Double Description Returns the natural (base e) logarithm of a given number (the first syntax) or the logarithm of a given number in a specified base (the second syntax) Rules at a Glance The natural logarithm is the logarithm base e, a constant whose value is approximately 2.718282. The natural logarithm satisfies the equation: e^Log(x) = x In other words, the natural logarithm function is the inverse function of the exponential function. d or a, the value whose natural logarithm the function is to return, must be a positive real number. If number is negative or zero, the function generates runtime error 5, “Invalid procedure call or argument.” This is a Shared member, so it can be used without creating any objects. Programming Tips and Gotchas

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Class Microsoft.VisualBasic.FileSystem Syntax LOF(filenumber) filenumber Use: Required Data Type: Integer Any valid file number Return Value Long Integer Description Returns the size of an open file in bytes Rules at a Glance filenumber must be the number of a file opened using the FileOpenfunction. Example The following example shows how to use the LOF function to prevent reading past the end of a file in binary mode: Dim fr As Integer = FreeFile( ) Dim sChar As Char FileOpen(fr, “c:data.txt”, OpenMode.Binary, OpenAccess.Read) Do While Loc(fr) < LOF(fr) FileGet(fr, sChar) Debug.Write(Loc(fr) & ": ") Debug.WriteLine(sChar) Loop Programming Tips and Gotchas LOF works only on an open file; if you need to know the size of a file that isn't open, use the FileLen function. See Also FileLen Function, FileOpen Procedure Log Function
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