Wie erkennen, ob physikalische Tastatur vorhanden

[p80286]

Zitat von ULIK:

ich suche einen Weg, um zu erkennen, ob an dem Rechner, auf dem mein Programm läuft, eine physikalische Tastatur vorhanden ist. Und zwar nicht nur registriert im System, sondern auch ob sie gerade aktiv ist (sprich, ob man darauf gerade schreiben könnte).

Das halte ich für unmöglich. Eine "Tastatur" ist eine Hardware, die Tastendrücke an das System sendet, und dafür eine geeignete Schnittstelle (USB,PS2..) nutzt.

Mit den geeigneten Treibern könntest Du feststellen ob z.B. über die PS2-Schnittstelle eine Tastatur physisch am Rechner hängt. Über USB bekommst Du nur ein HI und das kann physisch alles mögliche sein.

Gruß
K-H

[t.roller]

Wenn man einen Touchscreen hat, kann man z.B. MessagEase for Windows nutzen oder selbst nachbauen und in das eigene Programm einbauen.

[t.roller]

Wer will, kann mal die beiden WMI-Abfragen vergleichen, ob etwas Eindeutiges auf eine physikalische Tastatur hinweisst.

Delphi-Quellcode:

//-----------------------------------------------------------------------------------------------------
//     This code was generated by the Wmi Delphi Code Creator http://theroadtodelphi.wordpress.com
//     Version: 1.8.3.0 
//     LIABILITY DISCLAIMER
//     THIS GENERATED CODE IS DISTRIBUTED "AS IS". NO WARRANTY OF ANY KIND IS EXPRESSED OR IMPLIED.
//     YOU USE IT AT YOUR OWN RISK. THE AUTHOR NOT WILL BE LIABLE FOR DATA LOSS,
//     DAMAGES AND LOSS OF PROFITS OR ANY OTHER KIND OF LOSS WHILE USING OR MISUSING THIS CODE.
//----------------------------------------------------------------------------------------------------
program GetWMI_Info;

{$APPTYPE CONSOLE}

uses
(*  SysUtils, ActiveX, ComObj, Variants;  *)
  System.SysUtils,
  Winapi.ActiveX,
  System.Win.ComObj,
  System.Variants;

function VarToInt(const AVariant: Variant): INT64;// integer;
begin Result := StrToIntDef(Trim(VarToStr(AVariant)), 0); end;

// Funktionen und Verwaltung der logischen Tastatur.

procedure  GetCIM_KeyboardInfo;
const
  WbemUser            ='';
  WbemPassword        ='';
  WbemComputer        ='localhost';
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer(WbemComputer, 'root\CIMV2', WbemUser, WbemPassword);
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT * FROM CIM_Keyboard','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  while oEnum.Next(1, FWbemObject, iValue) = 0 do
  begin
    Writeln(Format('Availability                   %d',[VarToInt(FWbemObject.Availability)]));// Uint16
    Writeln(Format('Caption                        %s',[VarToStr(FWbemObject.Caption)]));// String
    Writeln(Format('ConfigManagerErrorCode         %d',[VarToInt(FWbemObject.ConfigManagerErrorCode)]));// Uint32
    Writeln(Format('ConfigManagerUserConfig        %s',[VarToStr(FWbemObject.ConfigManagerUserConfig)]));// Boolean
    Writeln(Format('CreationClassName              %s',[VarToStr(FWbemObject.CreationClassName)]));// String
    Writeln(Format('Description                    %s',[VarToStr(FWbemObject.Description)]));// String
    Writeln(Format('DeviceID                       %s',[VarToStr(FWbemObject.DeviceID)]));// String
    Writeln(Format('ErrorCleared                   %s',[VarToStr(FWbemObject.ErrorCleared)]));// Boolean
    Writeln(Format('ErrorDescription               %s',[VarToStr(FWbemObject.ErrorDescription)]));// String
    Writeln(Format('InstallDate                    %s',[VarToStr(FWbemObject.InstallDate)]));// Datetime
    Writeln(Format('IsLocked                       %s',[VarToStr(FWbemObject.IsLocked)]));// Boolean
    Writeln(Format('LastErrorCode                  %d',[VarToInt(FWbemObject.LastErrorCode)]));// Uint32
    Writeln(Format('Layout                         %s',[VarToStr(FWbemObject.Layout)]));// String
    Writeln(Format('Name                           %s',[VarToStr(FWbemObject.Name)]));// String
    Writeln(Format('NumberOfFunctionKeys           %d',[VarToInt(FWbemObject.NumberOfFunctionKeys)]));// Uint16
    Writeln(Format('Password                       %d',[VarToInt(FWbemObject.Password)]));// Uint16
    Writeln(Format('PNPDeviceID                    %s',[VarToStr(FWbemObject.PNPDeviceID)]));// String
    Writeln(Format('PowerManagementCapabilities    %d',[VarToInt(FWbemObject.PowerManagementCapabilities)]));// Array of Uint16
    Writeln(Format('PowerManagementSupported       %s',[VarToStr(FWbemObject.PowerManagementSupported)]));// Boolean
    Writeln(Format('Status                         %s',[VarToStr(FWbemObject.Status)]));// String
    Writeln(Format('StatusInfo                     %d',[VarToInt(FWbemObject.StatusInfo)]));// Uint16
    Writeln(Format('SystemCreationClassName        %s',[VarToStr(FWbemObject.SystemCreationClassName)]));// String
    Writeln(Format('SystemName                     %s',[VarToStr(FWbemObject.SystemName)]));// String
       
    Writeln('');
    FWbemObject:=Unassigned;
  end;
end;

procedure  GetWin32_KeyboardInfo;
const
  WbemUser            ='';
  WbemPassword        ='';
  WbemComputer        ='localhost';
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer(WbemComputer, 'root\CIMV2', WbemUser, WbemPassword);
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT * FROM Win32_Keyboard','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  while oEnum.Next(1, FWbemObject, iValue) = 0 do
  begin
    Writeln(Format('Availability                   %d',[VarToInt(FWbemObject.Availability)]));// Uint16
    Writeln(Format('Caption                        %s',[VarToStr(FWbemObject.Caption)]));// String
    Writeln(Format('ConfigManagerErrorCode         %d',[VarToInt(FWbemObject.ConfigManagerErrorCode)]));// Uint32
    Writeln(Format('ConfigManagerUserConfig        %s',[VarToStr(FWbemObject.ConfigManagerUserConfig)]));// Boolean
    Writeln(Format('CreationClassName              %s',[VarToStr(FWbemObject.CreationClassName)]));// String
    Writeln(Format('Description                    %s',[VarToStr(FWbemObject.Description)]));// String
    Writeln(Format('DeviceID                       %s',[VarToStr(FWbemObject.DeviceID)]));// String
    Writeln(Format('ErrorCleared                   %s',[VarToStr(FWbemObject.ErrorCleared)]));// Boolean
    Writeln(Format('ErrorDescription               %s',[VarToStr(FWbemObject.ErrorDescription)]));// String
    Writeln(Format('InstallDate                    %s',[VarToStr(FWbemObject.InstallDate)]));// Datetime
    Writeln(Format('IsLocked                       %s',[VarToStr(FWbemObject.IsLocked)]));// Boolean
    Writeln(Format('LastErrorCode                  %d',[VarToInt(FWbemObject.LastErrorCode)]));// Uint32
    Writeln(Format('Layout                         %s',[VarToStr(FWbemObject.Layout)]));// String
    Writeln(Format('Name                           %s',[VarToStr(FWbemObject.Name)]));// String
    Writeln(Format('NumberOfFunctionKeys           %d',[VarToInt(FWbemObject.NumberOfFunctionKeys)]));// Uint16
    Writeln(Format('Password                       %d',[VarToInt(FWbemObject.Password)]));// Uint16
    Writeln(Format('PNPDeviceID                    %s',[VarToStr(FWbemObject.PNPDeviceID)]));// String
    Writeln(Format('PowerManagementCapabilities    %d',[VarToInt(FWbemObject.PowerManagementCapabilities)]));// Array of Uint16
    Writeln(Format('PowerManagementSupported       %s',[VarToStr(FWbemObject.PowerManagementSupported)]));// Boolean
    Writeln(Format('Status                         %s',[VarToStr(FWbemObject.Status)]));// String
    Writeln(Format('StatusInfo                     %d',[VarToInt(FWbemObject.StatusInfo)]));// Uint16
    Writeln(Format('SystemCreationClassName        %s',[VarToStr(FWbemObject.SystemCreationClassName)]));// String
    Writeln(Format('SystemName                     %s',[VarToStr(FWbemObject.SystemName)]));// String

    Writeln('');
    FWbemObject:=Unassigned;
  end;
end;


begin
 try
    CoInitialize(nil);
    try
      GetCIM_KeyboardInfo;
      WriteLn('----------------------------------------------------------------');
      GetWin32_KeyboardInfo;
    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.