Delphi XE6 TStringHelper中的string类型转换

类型转换:

function ToBoolean: Boolean;

function ToInteger: Integer;

function ToSingle: Single;

function ToDouble: Double;

function ToExtended: Extended;

class function ToBoolean(const S: string): Boolean;

class function ToInteger(const S: string): Integer;

class function ToSingle(const S: string): Single;

class function ToDouble(const S: string): Double;

class function ToExtended(const S: string): Extended;
class function Parse(const Value: Integer): string;

class function Parse(const Value: Int64): string;

class function Parse(const Value: Boolean): string;

class function Parse(const Value: Extended): string;

//--------------------------------------------------------------------------------

var

  S: string;

  str: string;

  n: Integer;

  b: Boolean;

  f: Double;

begin

  str := S.Parse(123);

  n := str.ToInteger;  // 123

  b := str.ToBoolean;  // True
str := S.Parse(True);

  b := str.ToBoolean;  // True

  n := str.ToInteger;  // -1
str := S.Parse(3.14159260000);

  f := str.ToDouble;  //3.1415926

end;

Delphi XE6 TStringHelper中的string类型转换,码迷,mamicode.com