将内容过程中比较重要的一些内容记录起来，下边内容是关于C# 读取和设置大小写切换键状态的内容，希望能对各朋友有所用处。
using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace RobvanderWoude
{
public class CapsLock
{
[DllImport( "user32.dll" )]
static extern void keybd_event( byte bVk, byte bScan, uint dwFlags, UIntPtr dwExtraInfo );
const int KEYEVENTF_EXTENDEDKEY = 0x1;
const int KEYEVENTF_KEYUP = 0x2;
public static int Main( string[] args )
{
try
{
bool capsLock;
bool newState = false;
bool setState = false;
bool setVerbose = false;
bool verbose = true;
if ( args.Length > 2 )
{
return WriteError( "Invalid command line argument(s)." );
}
else
{
foreach ( string arg in args )
{
switch ( arg.ToUpper( ) )
{
case "/?":
case "-H":
case "/HELP":
case "-HELP":
case "--HELP":
return WriteError( string.Empty );
case "/Q":
case "-Q":
case "/QUIET":
case "-QUIET":
case "--QUIET":
if ( setVerbose )
{
return WriteError( "Duplicate switch not allowed." );
}
setVerbose = true;
verbose = false;
break;
case "/V":
case "-V":
case "/VERBOSE":
case "-VERBOSE":
case "--VERBOSE":
if ( setVerbose )
{
return WriteError( "Duplicate switch not allowed." );
}
setVerbose = true;
verbose = true;
break;
case "0":
case "OFF":
if ( setState )
{
return WriteError( "Duplicate argument not allowed." );
}
setState = true;
newState = false;
break;
case "1":
case "ON":
if ( setState )
{
return WriteError( "Duplicate argument not allowed." );
}
setState = true;
newState = true;
break;
default:
return WriteError( "Invalid command line argument " + arg );
}
}
}
if ( Control.IsKeyLocked( Keys.CapsLock ) )
{
capsLock = true;
if ( setState && !newState )
{
keybd_event( 0x14, 0x45, KEYEVENTF_EXTENDEDKEY, (UIntPtr) 0 );
keybd_event( 0x14, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, (UIntPtr) 0 );
}
}
else
{
capsLock = false;
if ( setState && newState )
{
keybd_event( 0x14, 0x45, KEYEVENTF_EXTENDEDKEY, (UIntPtr) 1 );
keybd_event( 0x14, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, (UIntPtr) 1 );
}
}
capsLock = Control.IsKeyLocked( Keys.CapsLock );
if ( verbose )
{
Console.Write( "CapsLock = " );
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine( ( capsLock ? "ON" : "OFF" ) );
Console.ResetColor( );
}
return ( capsLock ? 2 : 0 );
}
catch ( Exception e )
{
return WriteError( e );
}
}
public static int WriteError( Exception e )
{
return WriteError( e == null ? null : e.Message );
}
public static int WriteError( string errorMessage )
{
CapsLock, Version 1.01
Read or set CapsLock key state
Usage: CAPSLOCK [ 0 | 1 | ON | OFF ] [ /Quiet | /Verbose ]
Where: 0 or OFF sets CapsLock off
1 or ON sets CapsLock on
/Quiet won't display anything on screen
/Verbose displays the (new) CapsLock key state on screen (default)
Notes: An 'errorlevel' 0 is returned if CapsLock is off, 2 if
CapsLock is on, or 1 in case of (command line) errors.
Written by Rob van der Woude
if ( string.IsNullOrEmpty( errorMessage ) == false )
{
Console.Error.WriteLine( );
Console.ForegroundColor = ConsoleColor.Red;
Console.Error.Write( "ERROR: " );
Console.ForegroundColor = ConsoleColor.White;
Console.Error.WriteLine( errorMessage );
Console.ResetColor( );
}
Console.Error.WriteLine( );
Console.Error.WriteLine( "CapsLock, Version 1.01" );
Console.Error.WriteLine( "Read or set CapsLock key state" );
Console.Error.WriteLine( );
Console.Error.Write( "Usage: " );
Console.ForegroundColor = ConsoleColor.White;
Console.Error.WriteLine( "CAPSLOCK [ 0 | 1 | ON | OFF ] [ /Quiet | /Verbose ]" );
Console.ResetColor( );
Console.Error.WriteLine( );
Console.Error.Write( "Where: " );
Console.ForegroundColor = ConsoleColor.White;
Console.Error.Write( "0" );
Console.ResetColor( );
Console.Error.Write( " or " );
Console.ForegroundColor = ConsoleColor.White;
Console.Error.Write( "OFF" );
Console.ResetColor( );
Console.Error.WriteLine( " set CapsLock off" );
Console.ForegroundColor = ConsoleColor.White;
Console.Error.Write( " 1" );
Console.ResetColor( );
Console.Error.Write( " or " );
Console.ForegroundColor = ConsoleColor.White;
Console.Error.Write( "ON" );
Console.ResetColor( );
Console.Error.WriteLine( " set CapsLock on" );
Console.ForegroundColor = ConsoleColor.White;
Console.Error.Write( " /Q" );
Console.ResetColor( );
Console.Error.WriteLine( "uiet won't display anything on screen" );
Console.ForegroundColor = ConsoleColor.White;
Console.Error.Write( " /V" );
Console.ResetColor( );
Console.Error.WriteLine( "erbose displays the (new) CapsLock key state on screen (default)" );
Console.Error.WriteLine( );
Console.Error.WriteLine( "Notes: An "errorlevel" 0 is returned if CapsLock is off, 2 if" );
Console.Error.WriteLine( " CapsLock is on, or 1 in case of (command line) errors." );
Console.Error.WriteLine( );
Console.Error.WriteLine( "Written by Rob van der Woude" );
return 1;
}
}
}
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