Skip to main content

How to check the status of CAPS / NUMLOCK status in C#.NET

There are two types of codes available in C#.NET for checking the status of CAPS Lock and
NUM Lock.

a. Unmanaged Code : The code written in conventional languages like C, C++, VC++ etc. This kind of code can be called in the Managed Environment like .NET, JRE etc.

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true, CallingConvention = CallingConvention.Winapi)]
public static extern short GetKeyState(int keyCode);
bool CapsLock = (((ushort)GetKeyState(0x14)) & 0xffff) != 0;
bool NumLock = (((ushort)GetKeyState(0x90)) & 0xffff) != 0;
bool ScrollLock = (((ushort)GetKeyState(0x91)) & 0xffff) != 0;
MessageBox.Show("Caps Lock is on: " + CapsLock.ToString());
MessageBox.Show("Num Lock is on: " + NumLock.ToString());
MessageBox.Show("Scroll Lock is on: " + ScrollLock.ToString());

b. Managed Code: Code which is managed by the Runtime environment. This type of code is
basically a wrapper to the API classes that the Operating System Provides.

The Console
This is a standard class within the System namespace. It represents the standard input, output and error streams for console applications. If we wish to determine the status of Caps Lock key using console class we can use the code below:
if (Console.CapsLock)
{
Console.WriteLine("Caps Lock is on!");
}
Control class also includes a method IsKeyLocked which allows to determine whether keys such as Caps Lock are switched on or off.
if (Control.IsKeyLocked(Keys.CapsLock))
{
MessageBox.Show("Caps Lock is on!");
}
On the similar grounds we can check the status of num lock etc e.g. IsKeyLocked(Keys.NumLock)

Comments

MANISH said…
Thanks Sir.....
April 18, 2011 at 5:39 AM
Anonymous said…
Thanks a lot Sir.
April 23, 2011 at 1:13 AM
Post a Comment

Popular posts from this blog

How to use QueryExtenderControl in ASP.NET with LINQ

Queryextender control is a control that helps in doing actions like filtration, searching, sorting etc. on the LINQ Data source with few steps. In fact we don’t have to write any code with this. Screenshot given below is just an example that can easily be achieved through this control. In the above screenshot, we can see that there is a GridView Control that has been binded to a LINQData Source Control. And we have a DropDownlistBox that is also binded to another LINQData Source Control and displaying only grouped jobs. The GridView display all the employees who are matching the Job Parameter. This is done through QueryExtender Control. Also we can search for any name in the employee name's through Query Extender control. The code in the HTML goes like: < form id ="form1" runat ="server">     < div >         Select Job: < asp : DropDownList ID ="Job" runat ="server" DataSourceID ="LinqDataSource2...
Post a Comment
Read more

SQLServer Error: 15404, Could not obtain information about Windows NT group/user Error code 0x5. [SQLSTATE 42000] (ConnIsLoginSysAdmin)

If we encounter this error "SQLServer Error: 15404, Could not obtain information about Windows NT group/user Error code 0x5. [SQLSTATE 42000] (ConnIsLoginSysAdmin)" in SQL Server in which the job fails because of the user account related problem, then we need to take the following steps to make it work: a. Go to SQL Server Agent. b. Then select the job which is giving error and not running successfully. c. Then choose properties and in the General Tab, change the owner to "SA" or any account that has the administrative privileges. The problem will be resolved.
1 comment
Read more

How to Delete Record through Knex.

This post is all about of deleting records through KNEX ORM in Nodejs. The following code shows how to achieve this: knex("depts").where("deptno","50").del() .then(function (count) {     console.log(count); }) .finally(function () {     knex.destroy(); }); The above code deletes a record from a table "Depts" where Deptno = 50. It has a "then" Promise attached that will show how many records were deleted with this command. Also "finally" is the method that will always execute and will close the KNEX connection. Happy Coding !!!
Post a Comment
Read more