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本文实例讲述了C#读取或设置ScrollLock状态的方法。分享给大家供大家参考。具体如下：
C#读取或者设置ScrollLock状态，允许滚动状态读取或者设置
using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace RobvanderWoude
{
public class ScrollLock
{
[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 scrollLock;
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.Scroll ) )
{
scrollLock = true;
if ( setState && !newState )
{
keybd_event(0x91, 0x45, KEYEVENTF_EXTENDEDKEY, (UIntPtr) 0);
keybd_event(0x91, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, (UIntPtr) 0);
}
}
else
{
scrollLock = false;
if ( setState && newState )
{
keybd_event(0x91,0x45,KEYEVENTF_EXTENDEDKEY,(UIntPtr) 1);
keybd_event(0x91,0x45,KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP,(UIntPtr) 1);
}
}
scrollLock = Control.IsKeyLocked( Keys.Scroll );
if ( verbose )
{
Console.Write( "ScrollLock = " );
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine( ( scrollLock ? "ON" : "OFF" ) );
Console.ResetColor( );
}
return ( scrollLock ? 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 )
{
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( "ScrollLock, Version 1.01" );
Console.Error.WriteLine( "Read or set ScrollLock key state" );
Console.Error.WriteLine( );
Console.Error.Write( "Usage: " );
Console.ForegroundColor = ConsoleColor.White;
Console.Error.WriteLine("SCROLLLOCK [ 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 ScrollLock 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 ScrollLock 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) ScrollLock key state on screen (default)");
Console.Error.WriteLine();
Console.Error.WriteLine("Notes: An \"errorlevel\" 0 is returned if ScrollLock is off, 2 if");
Console.Error.WriteLine(" ScrollLock 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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希望本文所述对大家的C#程序设计有所帮助。
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