Ip-address TextBox

Http://www.codeproject.com/Articles/4693/IP-Address-TextBox

You can download the trial effect. Personal feeling is very powerful, but the input is not very comfortable. can refer to.

Ntroduction

Problem was, I didn ' t find a solution to edit the IP address like in the Windows network environment, for C #. Although there is some controls for masked edit fields, I wanted to write my own, and if so I wanted it to behave like th e controls from the MFC library or Windows network environment and maybe a little more.

Problems to solve

The heaviest problem at writing the control is to catch the inputs of backspace and delete keys, to delete characters fro m the input field. I tried a lot with overridden event handlers, and that OnKeyDown OnKeyUp it didn ' t work like it should.

Then I remembered this another developer had overridden the PreProsessMessage method to catch keyboard inputs and handle it in own it S. So I implemented PreProcessMessage a override for to handle all the backspaces and delete key presses and used OnKeyUp , and OnKeyPress to handle the inputs of dots and slashes and sets the input cursor to the right position.

OnKeyDown Event

/// <summary>///Override Standard Keydowneventhandler///Catches Inputs of "." and "/" to the jump to next positions/// </summary>/// <param name= "E" >keyeventargument</param>protected Override voidOnKeyDown (KeyEventArgs e) {//Zeichen a die richtige Stelle schreiben   intIPos = This.   SelectionStart; Char[] Ctext = This.   Text.tochararray (); if(E.modifiers = =keys.none) {if((Char. Isletterordigit (Convert.tochar (e.keyvalue)) | |E.keycode= = keys.numpad0)//numpad0=96 --'&& IPos < This. TextLength) {if(Ctext[ipos] = ='.'|| Ctext[ipos] = =':'|| Ctext[ipos] = ='/') IPos+=1;  This. SelectionStart =IPos; if( This. Overwritemode) {if(Ctext[ipos]! =' ')                This. SelectionLength =1; }           Else           {                if(IPos < This. TextLength)if(Ctext[ipos] = =' ')                        This. SelectionLength =1; }       }   }   Base. OnKeyDown (e);}

OnKeyUp Event

/// <summary>///Override Standard Keyupeventhandler///Catches Inputs of "." and "/" to the jump to next positions/// </summary>/// <param name= "E" >keyeventargument</param>protected Override voidOnKeyUp (KeyEventArgs e) {//Zeichen a die richtige Stelle schreiben     intIPos = This.     SelectionStart; Char[] Ctext = This.        Text.tochararray (); //Cursor hintern Punkt setzen     if((Char. Isletterordigit (Convert.tochar (e.keyvalue)) | |E.keycode= = keys.numpad0)//numpad0=96 --'&& IPos < This. TextLength) {if(Ctext[ipos] = ='.'|| Ctext[ipos] = =':'|| Ctext[ipos] = ='/') IPos+=1;  This. SelectionStart =IPos; }     Base. OnKeyUp (e);}

OnKeyPress Event

/// <summary>///Override Standard Keypresseventhandler///Catches Inputs of "." and "/" to the jump to next positions/// </summary>/// <param name= "E" >keypresseventargument</param>protected Override voidOnKeyPress (KeyPressEventArgs e) {//zulassige Zeichen    if(Char. Iscontrol (E.keychar) | |M_regexvalidnumbers.ismatch (e.keychar.tostring ())) {e.handled=false; }    Else    {         Switch(E.keychar) { Case '/':                  This.                  Jumptoslash ();  Break;  Case '.':                   This.                  Jumptonextdot ();  Break; default:                   Break; } e.handled=true; }    Base. OnKeyPress (e);}

preProcessMessage

/// <summary>///Override Standard preProcessMessage///Catches Inputs of BackSpace and deletes/// </summary>/// <param name= "MSG" >preProcessMessage</param> Public Override BOOLpreProcessMessage (refMessage msg) {    if(Msg. MSG = =wm_keydown) {Keys KeyData= (Keys) (int) Msg. WParam) |ModifierKeys; Keys KeyCode= (Keys) (int) Msg.        WParam); intIPos = This.        SelectionStart; Char[] Ctext = This.        Text.tochararray (); Switch(keycode) { CaseKeys.delete:if(IPos < This. TextLength) { while(Ctext[ipos] = ='.'||Ctext[ipos]==':'||Ctext[ipos]=='/')                    {                        if((ipos+=1) >=ctext.length) Break; }                    if(IPos < This. TextLength) {Base. Text = This. Text.substring (0, IPos) +" "+ This. Text.substring (ipos+1);  This. SelectionStart = ipos+1; }                    Else                         This. SelectionStart = This. textlength-1; }                   return true;  CaseKeys.back:if(IPos >0)                {                     while(ctext[ipos-1] =='.'||Ctext[ipos-1] ==':'||Ctext[ipos-1] =='/')                    {                        if((ipos-=1) <=0)                             Break; }                    if(ipos>0)                    {                        Base. Text = This. Text.substring (0, ipos-1)                                     +" "+ This.                        Text.substring (IPos);  This. SelectionStart = ipos-1; }                    Else                         This. SelectionStart =0; }                return true; default:                 Break; }        }    return Base. preProcessMessage (refmsg);}

Another problem was the input of numbers via the Numpad. Especially the 0 key was not recognized, because it's char value is neither a letter nor a digit, so I had to ask for hard coded.

Hide Copy Code

if (char. Isletterordigit (Convert.tochar (e.keyvalue)) | |     E.keycode = = keys.numpad0)//numpad0=96    ---"this. TextLength) {[...]}   

At least ...

... I have a control over looks like a with TextBox dots, where I can input numbers, the type dots to jump to next IP parts, and get Its contents via the property Text .

Using the Code

Include the IPAddressTextBox.cs in your project. Set A in TextBox your form or the user control and clear its contents. The change of the type of the is in TextBox System.Windows.Forms.TextBox rj2_cs.IPAddressTextBox code Editor. Then your can change the properties of the IP textbox like you want.

Ip-address TextBox