| Description |
Attempts to parse the Value string into a value between -9,223,372,036,854,775,808 and 9,223,372,036,854,775,807, returning a Int64 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 ?,$ ... |
| AllowExponent | E+000 format |
| AllowThousands | For example : 1,000,000 |
| AllowDecimalPoint | For example : 123.456 |
| AllowParentheses | For example (1234) |
| AllowTrailingSign | For example : 123- |
| AllowLeadingSign | For example : -123 |
| AllowTrailingWhite | Allow trailing blanks |
| AllowLeadingWhite | Allow leading blanks |
| AllowHexSpecifier | For example : 0x2bcd |
Note that not all of these allowances are meaningful for Int16 values.
The FormatProvider option allows for customised formatting and is beyond the scope of Delphi Basics.
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| | Notes | Warning : An exception is thrown if the parse encounters unexpected characters.
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| | References | NumberStyles
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| Microsoft MSDN Links |
System
System.Int64
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| A simple example |
program Project1;
{$APPTYPE CONSOLE}
uses
System.Globalization;
var
intStr : String;
result : Int64;
begin
intStr := '12345678';
result := System.Int64.Parse(intStr);
Console.WriteLine('''' + intStr + ''' parses to {0}', result.ToString);
Console.ReadLine;
end.
| | Show full unit code | '12345678' parses to 12345678
| | | Using NumberStyles | program Project1;
{$APPTYPE CONSOLE}
uses
System.Globalization;
var
style : NumberStyles;
intStr : String;
result : Int64;
begin
// Allow for hex values and leading/trailing blanks
style := NumberStyles.AllowLeadingWhite or
NumberStyles.AllowTrailingWhite or
NumberStyles.AllowHexSpecifier;
intStr := ' 1234567890ABCDEF '; // Hex 1234567890ABCDEF =
result := System.Int64.Parse(intStr, style);
Console.WriteLine('''' + intStr + ''' parses to {0}', result.ToString);
// Or more simply using one combined number style value
style := NumberStyles.HexNumber;
intStr := ' FFFFFFFFFFFFFF00 '; // Hex FFFFFFFFFFFFFF00 = -256
result := System.Int64.Parse(intStr, style);
Console.WriteLine('''' + intStr + ''' parses to {0}', result.ToString);
Console.ReadLine;
end.
| | Show full unit code | ' 1234567890ABCDEF ' parses to 1311768467294899695
' FFFFFFFFFFFFFF00 ' parses to -256
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