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如何自动决定是否在 Windows 中显示虚拟键盘?

我们正在我们的应用程序中添加对手势和虚拟键盘的支持,但是当我连接了真实键盘时不想看到虚拟键盘......

谢谢!

更新:RRUZ(他没有 win8 平板电脑)有一个有用的建议,但没有奏效,因为 win8 平板电脑的行为不符合预期。

To get the number of keyboards present in the system you can use the Win32_Keyboard WMI class.

Try this sample

{$APPTYPE CONSOLE}

uses
  SysUtils,
  ActiveX,
  ComObj,
  Variants;

function  GetKeyboardCount : integer;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  Result:=0;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\CIMV2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT DeviceID FROM Win32_Keyboard','WQL', $00000020);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  while oEnum.Next(1, FWbemObject, iValue) = 0 do
  begin
    Inc(Result);
    FWbemObject:=Unassigned;
  end;
end;

begin
 try
    CoInitialize(nil);
    try
      Writeln(Format('Keyboards %d', [GetKeyboardCount]));
    finally
      CoUninitialize;
    end;
 except
    on E:EOleException do
        Writeln(Format('EOleException %s %x', [E.Message,E.ErrorCode]));
    on E:Exception do
        Writeln(E.Classname, ':', E.Message);
 end;
 Writeln('Press Enter to exit');
 Readln;
end.

以我的经验,这在现实世界中无济于事:在我的 Win8 平板电脑上,设备管理器报告了一个 PS/2 键盘(!!),所以像这样的函数永远不会告诉你没有键盘。– 吉尔 9 小时前

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