System.SysUtils.TryStrToInt
Delphi
function TryStrToInt(const S: string; out Value: Integer): Boolean;
C++
extern DELPHI_PACKAGE bool __fastcall TryStrToInt(const System::UnicodeString S, /* out */ int &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 with Boolean success code.
TryStrToInt converts the string S, which represents an integer-type number in either decimal or hexadecimal notation, into a number, which is assigned to Value. If S does not represent a valid number, TryStrToInt returns False; otherwise TryStrToInt returns True.
TryStrToInt supports strings in the following hexadecimal notations:
- Delphi: $1234 and 0x1234.
- C++: 0x1234.
To accept decimal but not hexadecimal values in the input string, you may use code like this:
Delphi:
function TryDecimalStrToInt( const S: string; out Value: Integer): Boolean;
begin
result := (pos('$',S)=0) and ((pos('x',S)=0)) and TryStrToInt(S,Value);
end;
C++:
bool __fastcall TForm1::TryDecimalStrToInt(const System::UnicodeString S, int &Value)
{
bool result;
result= (Pos('x',S)==0) && TryStrToInt(S,Value);
return result;
}
Note: In Delphi, you can also use the C++ hexadecimal values notation, and use prefixes 0x or x indistinctly.