編程檢測鼠標和鍵盤是否插入

Question

我想知道檢測鼠標或鍵盤是否插入計算機的最佳方法是什麼？我有一個主要用於觸摸屏獨立應用程序的應用程序，但我想知道是否有插入的鍵盤不會觸發拔出Windows鍵盤或包含數字鍵盤的窗體。如果沒有插入鼠標，則改變一些行爲。

Answer 1

使用VB.Net，我會用System.Management（不要忘記在項目[菜單]添加此引用 - >添加引用）ManagementObjectSearcher與System.Linq相結合，找到解決這個樣子，

Imports System 
Imports System.Management 
Imports System.Linq 

Public Module Module1 
    Public Sub Main() 
     Console.WriteLine(HasDevice("PointingDevice")) 
     Console.WriteLine(HasDevice("Keyboard")) 
     Console.ReadKey() 
    End Sub 

    Public Function HasDevice(strtype As String) 
     Dim searcher As New ManagementObjectSearcher("root\CIMV2", "SELECT * FROM Win32_" + strtype) 
     Dim result = From mobj In searcher.Get() 
        Select mobj Where mobj("Status").ToString() = 0 
     Return Not IsNothing(result) 
    End Function  
End Module 

結果

你也硬編碼，以避免輸入錯誤像三合建議（雖然使用C＃）

Public Function HasPointingDevice() 
    Dim searcher As New ManagementObjectSearcher("root\CIMV2", "SELECT * FROM Win32_PointingDevice") 
    Dim result = From mobj In searcher.Get() 
       Select mobj Where mobj("Status").ToString() = 0 
    Return Not IsNothing(result) 
End Function 

Public Function HasKeyboard() 
    Dim searcher As New ManagementObjectSearcher("root\CIMV2", "SELECT * FROM Win32_Keyboard") 
    Dim result = From mobj In searcher.Get() 
       Select mobj Where mobj("Status").ToString() = 0 
    Return Not IsNothing(result) 
End Function 

，並呼籲他們這樣

Public Sub Main() 
    Console.WriteLine(HasPointingDevice()) 
    Console.WriteLine(HasKeyboard()) 
    Console.ReadKey() 
End Sub 

他們會產生相同的結果

Answer 2

您可以使用C＃System.Management和ManagementObjectSearcher

這裏是一個示例代碼。根據需要進行修改。

public bool isPointingDeviceAttached() 
    { 
     ManagementObjectSearcher searcher = 
      new ManagementObjectSearcher("root\\CIMV2", "SELECT * FROM Win32_PointingDevice"); 

     int devCount = 0; 

     foreach (ManagementObject obj in searcher.Get()) { 
      if(obj["Status"].ToString().Contains("OK")) // if device is ready 
      devCount++; 
     } 
     return devCount>0; 
    } 

    public bool isKeyboardAttached() 
    { 
     ManagementObjectSearcher searcher = 
      new ManagementObjectSearcher("root\\CIMV2", "SELECT * FROM Win32_Keyboard"); 

     int devCount = 0; 

     foreach (ManagementObject obj in searcher.Get()) { 
      if (obj["Status"].ToString().Contains("OK")) // if device is ready 
       devCount++; 
     } 

     return devCount>0; 
    } 

確保添加using System.Management;線，並在添加引用System.Management。 您可以根據需要使用更多的ManagementObject屬性。以下是屬性列表和一些其他外部參考。

Pointing device class ref. & attribute list

C#, C++ similar example