So im trying to make a byte to byte converter C#

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bsically i have one button and two rich text boxes, i am trying to add "0x" and a "," to my hex bytes, example from 00 01 02 to 0x00, 0x01, 0x02 my problem is i keep getting a Object reference not set to an instance of an object error, here is my code

C#

public int i { get; set; }
     public int amount { get; set; }


     private void button2_Click(object sender, EventArgs e)
     {
         if (richTextBox1.Text.Length >= 2)
         {


             string text =  richTextBox1.Text.Replace( "", "");
             int num = text.Length;
             for (int i = 0; i <= num; i += 6)
             {
                 num = text.Length + 2;
                 text = text.Insert(i,( "0x"));
                 text = text.Insert(i + 4,( ","));
             }


             richTextBox2.Text = text.Remove(text.Length - 2);
         }

i am getting the error here, if (richTextBox1.Text.Length >= 2)

here is the full error

An unhandled exception of type 'System.NullReferenceException' occurred in byte converter.exe

Additional information: Object reference not set to an instance of an object.

btw im a beginner coder so be easy on me lol, any helf would be greatly appreciated.

Posted 8-Jun-15 21:05pm

Member 11536857

Updated 8-Jun-15 21:23pm

v2

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Comments

CPallini 9-Jun-15 3:22am

It looks your richTextBox1 is an invalid reference (i.e. is not bound to the actual control).

Member 11536857 9-Jun-15 3:23am

you have a suggestion on how to fix that? sorry man, pretty new to all this

CPallini 9-Jun-15 3:33am

Make sure it referes to an actual object. Did you create the RichTextBoxes dynamically (or did you add it in the design window?) ?

Member 11536857 9-Jun-15 3:34am

i added it in the design window, i added thw button and then the two richtextboxes

CPallini 9-Jun-15 3:37am

Use the debugger to step into the code and find the offending reference.

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OriginalGriff · Answer 1 · 2015-06-08T21:38:00

Start by checking in the debugger: as CPallini says, it's likely that your richTextBox1 is not a valid control - which presumably means you created it in your code instead of allocating it via the designer. So it won't be displayed either!

Look at the designer, highlight the rich text box you think is going to get the user input, and look at the properties pane to find it's name. Use that in your Click event handler, instead of richTextBox1 and it may start to work.

But... what do you think this code does?

C#

string text =  richTextBox1.Text.Replace( "", "");

Why are you trying to replace an empty string with an empty string?
The code you are using to insert your "0x" and commas is a little odd as well: Consider using a StringBuilder instead, or better break your input string into the hex digits first, then convert them to "0xNN" and use String.Join to add all the commas - it's a "cleaner" solution that is a lot easier to read! :laugh: