delphi – 控制台应用程序中的掩码密码输入

program Project2;

{$APPTYPE CONSOLE}

uses
  SysUtils,Windows;

function Getpassword(const InputMask: Char = '*'): String;
var
  OldMode: Cardinal;
  c: char;
begin
  GetConsoleMode(GetStdHandle(STD_INPUT_HANDLE),OldModE);
  SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE),OldMode and not (ENABLE_LINE_INPUT or ENABLE_ECHO_INPUT));
  try
    while not Eof do
    begin
      Read(c);
      if c = #13 then // Carriage Return
        Break;
      Result := Result + c;
      if c = #8 then // BACk Space
        Write(#8)
      else
        Write(InputMask);
    end;
  finally
    SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE),OldModE);
  end;
end;

begin
  try
    Writeln(Format(sLineBreak + 'pswd=%s',[Getpassword]));
    Readln;
  except
    on E: Exception do
      Writeln(E.ClassName,': ',E.messagE);
  end;
end.

更新：请注意,上面的代码在视觉上处理BACkSpaces,但将它们嵌入密码中,这可能不是您想要的.
在这种情况下,以下代码将过滤掉它们：

if c = #13 then // Carriage Return
    Break;
  if (c = #8) and (Length(Result) > 0) then  // BACk Space
  begin
    delete(Result,Length(Result),1);
    Write(#8);
  end
  else
  begin
    Result := Result + c;
    Write(InputMask);
  end;