VBScript Reference Manual for InduSoft Web Studio

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VBScript Reference Manual InduSoft Web Studio LeftB Description Returns a specified number of bytes from the left side of a string Usage strVal = Left(string, length) Arguments string String expression from which the leftmost bytes are returned. length Numeric expression indicating how many bytes to return. Return A String. Remarks The LeftB function is used with byte data contained in a string instead of character data. If string contains Null, Null is returned. If length = 0, a zero-length string("") is returned. If length is greater than or equal to the number of characters in string, the entire string is returned. To determine the number of characters in string, use the Len function. See Also Left, Len, LenB, LTrim, Mid, MidB, Right, RTrim, Trim Example The following example uses the Left function to return the first three characters of MyString Len Description Returns the number of characters in a string. Usage intVal = Len(string) Arguments string Any valid string expression. Return An Integer Remarks If string contains Null, Null is returned. The Len function is used with character data contained in a string. See Also Left, LeftB, LenB, LTrim, Mid, MidB, Right, RTrim, Trim Example Dim MyString MyString = Len("VBSCRIPT") ' MyString contains 8. LenB Description Returns the number of bytes used to represent a string. Usage LenB(string) Arguments string Any valid string expression containing byte data. Return An Integer. Remarks If string contains Null, Null is returned. The LenB function is used with byte data contained in a string. Instead of returning the number of characters in a string, LenB returns the number of bytes used to represent that string. See Also Left, LeftB, Len, LTrim, Mid, MidB, Right, RTrim, Trim 146 InduSoft, Ltd.
InduSoft Web Studio VBScript Reference Manual LoadPicture Description Returns a picture object. Usage objPict = LoadPicture(picturename) Arguments picturename The picturename argument is a string expression that indicates the name of the picture file to be loaded. Return An object reference to a picture file Remarks Graphics formats recognized by LoadPicture include bitmap (.bmp) files, icon (.ico) files, runlength encoded (.rle) files, metafile (.wmf) files, enhanced metafiles (.emf), GIF (.gif) files, and JPEG (.jpg) files. Once the picture object is loaded, it can be manipulated by other controls (e.g. ActiveX controls). A runtime error occurs if picturename does not exist or is not a valid picture file. Use LoadPicture(“”) to clear a particular picture. This function is available on 32-bit platforms only. Example objPic = LoadPicture (“c:\mypictures\picture1.jpg”) Log Description Returns the natural logarithm of a number. Usage realVal = Log(number) Arguments number The number argument can be any valid numeric expression greater than 0. Return A Real. Remarks The natural logarithm is the logarithm to the base e. The constant e is approximately 2.718282. You can calculate base-n logarithms for any number x by dividing the natural logarithm of x by the natural logarithm of n as follows: Logn(x) = Log(x) / Log(n) See also Exp Example Function Log10(X) ‘ Calculate base-10 logarithm Log10 = Log(X) / Log(10) End Function LTrim Description Returns a copy of a string without leading spaces (LTrim), trailing spaces (RTrim), or both leading and trailing spaces (Trim). Usage strVal = LTrim(string) Arguments string Required. Any valid string expression. Return A String. Remarks A space “ “ is Chr(32). If string contains Null, Null is returned. See Also Left, LeftB, Len. LenB, Mid, MidB, Right, RTrim, Trim Example The following example uses the LTrim, RTrim, and Trim functions to trim leading spaces, trailing spaces, and both leading and trailing spaces, respectively Dim MyVar MyVar = LTrim(" vbscript ") ' MyVar contains "vbscript ". MyVar = RTrim(" vbscript ") ' MyVar contains " vbscript". MyVar = Trim(" vbscript ") ' MyVar contains "vbscript". InduSoft, Ltd. 147
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