Winform hot key functions implemented using Ctrl + C and Ctrl + V copy and paste

When we use the winform controls, you will find these controls (such as Label) does not support Ctrl + c to copy and Ctrl + v keyboard shortcuts to copy and paste function, if we need to implement this function to change how to do it?

1. First, we create a winform project.

We add three controls on the form in the project, two and a label textBox

We are going to achieve the function is to use Ctrl + C content can be displayed on the label Copy me the label "Copy me" copied to the clipboard, when we use Ctrl + V in the textbox controls which can Clipboard copy the string to the textbox control, and then we modify the string in which textBox use Ctrl + C to copy the string, and then select copy me label can use Ctrl + V to copy the value of the textbox to copy me this label inside, but check can not copy this label use Ctrl + C and Ctrl + V do not have any effect.

 

2. we add a new class HotKeysManager, this class uses DllImport features introduced user32.dll, and two inside the package and method RegisterHotKey UnregisterHotKey, code is as follows:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace HotKey
{
    public class HotKeysManager
    {
        // If the function succeeds, the return value is not zero.
        // If the function fails, the return value is zero. To get extended error information, call GetLastError. 
        [The DllImport ( " User32.dll " , the SetLastError = to true )]
         public  static  extern  BOOL RegisterHotKey (
            HWnd IntPtr,                 // handle to define a hotkey window 
            int the above mentioned id,                      // define a hotkey ID (can not be duplicated with other ID)            
            KeyModifiers fsModifiers,    // whether to identify when you press the hot key Alt, Ctrl, Shift, Windows and other key to take effect 
            Keys VK                      // content-defined hotkey 
            );

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool UnregisterHotKey(
            HWnd IntPtr,                 // you want to cancel the hotkey window handle 
            int the above mentioned id                       // To cancel a hotkey ID 
            );

        // defines the name of the secondary keys (character into a digital memory in order, may also be used directly remove this enumeration value) 
        [the Flags ()]
         public  enum KeyModifiers
        {
            None = 0,
            Alt = 1,
            Ctrl = 2,
            Shift = 4,
            WindowsKey = 8
        }
    }
}

 

3, we come in when the mouse enters Copy me in the Form registered hotkey Ctrl + C and Ctrl + V Copy me when the mouse leaves our cancellation hotkey Ctrl + C and Ctrl + V, and then reload the WndProc method to capture hotkey news If it is the Ctrl + C to copy values ​​to the clipboard copy me inside, if the copy Ctrl + V to put the contents of the clipboard copy me label inside.

Look at the code:

/// Overload FromA in WndProc function
         /// monitor Windows message
         /// overloaded WndProc method for implementing a response hotkey
        
        protected override void WndProc(ref Message m)
        {
            const  int WM_HOTKEY = 0x0312 ;
             // Ankuaichajian 
            Switch (m.Msg)
            {
                case WM_HOTKEY:
                    switch (m.WParam.ToInt32())
                    {
                        case 100:
                            Clipboard.SetText(this.labelTest.Text);             
                            break;
                        case 101:   
                            this.labelTest.Text = Clipboard.GetText();
                            break;
                    }
                    break;
            }
            base.WndProc(ref m);
        }

        private void labelTest_MouseLeave(object sender, EventArgs e)
        {

            // cancellation Id No. 100 hotkey set 
            HotKeysManager.UnregisterHotKey (the Handle, 100 );
             // cancellation Id Number hotkey set to 101 
            HotKeysManager.UnregisterHotKey (the Handle, 101 );
        }

        private void labelTest_MouseEnter(object sender, EventArgs e)
        {
            // Register hotkey Ctrl + C, Id number 100. . 
            HotKeysManager.RegisterHotKey (the Handle, 100 , HotKeysManager.KeyModifiers.Ctrl, Keys.C);
             // Register hotkey Ctrl + V, Id No. 101. 
            HotKeysManager.RegisterHotKey (the Handle, 101 , HotKeysManager.KeyModifiers.Ctrl, Keys.V);
        }

So we realized Ctrl + C and Ctrl + V to copy and paste the contents of the label functions.