Home  |  Delphi .net Home  |  System.Byte  |  Parse Method
  
Parse  
Method  
Converts a string representation of a Byte into a Byte value
Byte Structure
System NameSpace
CF1.  Function Parse ( Value : String ) : Byte; Static;
CF2.  Function Parse ( Value : String; Style : NumberStyles ) : Byte; Static;
CF3.  Function Parse ( Value : String; FormatProvider : IFormatProvider ) : Byte; Static;
CF4.  Function Parse ( Value : String; Style : NumberStyles; FormatProvider : IFormatProvider ) : Byte; Static;
CF : Methods with this mark are Compact Framework Compatible
Description
Attempts to parse the Value string into a value between 0 and 255, returning a Byte object with this value.
 
The Style parameter determines the allowed number content. It is an enumerated type that is treated as a set of flags (it has the [Flags] attribute. This means that multiple values may be set, using logical or. The possible values are :
 
AllowCurrencySymbol Allow for ?,$ ...
AllowExponentE+000 format
AllowThousandsFor example : 1,000,000
AllowDecimalPointFor example : 123.456
AllowParenthesesFor example (1234)
AllowTrailingSignFor example : 123-
AllowLeadingSignFor example : -123
AllowTrailingWhiteAllow trailing blanks
AllowLeadingWhiteAllow leading blanks
AllowHexSpecifierFor example : 0x2bcd

 
Note that only a few of these allowances are meaningful for byte values.
 
The FormatProvider option allows for customised formatting and is beyond the scope of Delphi Basics.
Notes
Warning : An exception is thrown if the parse encounters unexpected characters.

Static methods are not methods of an object - they are simply class functions or procedures available at any time.
References
NumberStyles
Microsoft MSDN Links
System
System.Byte
 Author links

 Buy Website Traffic at
 Buywebsitetrafficexperts.com

 Buy Proxies at
 Buyproxies.io
 
 
 
A simple example
program Project1;
{$APPTYPE CONSOLE}

uses
  System.Globalization;

var
  byteStr : String;
  result  : Integer;

begin
  byteStr := '23';
  result  := System.Byte.Parse(byteStr);
  Console.WriteLine('''' + byteStr + ''' parses to {0}', result.ToString);

  Console.ReadLine;
end.
   '23' parses to 23
Using NumberStyles
program Project1;
{$APPTYPE CONSOLE}

uses
  System.Globalization;

var
  style   : NumberStyles;
  byteStr : String;
  result  : Integer;

begin
  // Allow for hex values and leading/trailing blanks
  style := NumberStyles.AllowLeadingWhite  or
           NumberStyles.AllowTrailingWhite or
           NumberStyles.AllowHexSpecifier;

  byteStr := ' 23 ';   // Hex 23 = 35
  result  := System.Byte.Parse(byteStr, style);
  Console.WriteLine('''' + byteStr + ''' parses to {0}', result.ToString);

  // Or more simply using one combined number style value
  style := NumberStyles.HexNumber;

  byteStr := ' AC ';   // Hex AC = 172
  result  := System.Byte.Parse(byteStr, style);
  Console.WriteLine('''' + byteStr + ''' parses to {0}', result.ToString);

  Console.ReadLine;
end.
   ' 23 ' parses to 35
   ' AC ' parses to 172
 
 
Delphi Programming Neil Moffatt 2002 - 2017. All rights reserved.  |  Contact the author