System.SysUtils.TryStrToUInt64
Delphi
function TryStrToUInt64(const S: string; out Value: UInt64): Boolean;
C++
extern DELPHI_PACKAGE bool __fastcall TryStrToUInt64(const System::UnicodeString S, /* out */ unsigned __int64 &Value)/* overload */;
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
| function | public | System.SysUtils.pas System.SysUtils.hpp |
System.SysUtils | System.SysUtils |
Description
Converts a string that represents an integer (decimal or hex notation) into a number.
TryStrToUInt64 converts the string S, which represents an integer-type number in either decimal or hexadecimal notation, into a number, which is assigned to Value. Value is expressed as an unsigned 64 bit sized integer. If S does not represent a valid number, TryStrToUInt64 returns False; otherwise TryStrToUInt64 returns True.
TryStrToUInt64 supports strings in the following hexadecimal notations:
- Delphi: 0$1234 and 0x1234.
- C++: 0x1234.
To accept decimal but not hexadecimal values in the input string, you may use code like this:
Delphi:
function TryDecimalStrToUInt64( const S: string; out Value: UInt64): Boolean;
begin
result := (pos('$',S)=0) and ((pos('x',S)=0)) and TryStrToUInt64(S,Value);
end;
C++:
bool __fastcall TForm1::TryDecimalStrToUInt64(const System::UnicodeString S, unsigned __int64 &Value)
{
bool result;
result= (Pos('x',S)==0) && TryStrToUInt64(S,Value);
return result;
}