Hi all,

I am using two forms and will be using a sting named "test" in both forms. To so so, I declared the string as "public static string test;" in form1.

For some reason I am getting the following error:

Error 1 The name 'test' does not exist in the current context

Why is this happening please?

 

Hi all,

I am using two forms and will be using a sting named "test" in both forms. To so so, I declared the string as "public static string test;" in form1.

For some reason I am getting the following error:



Why is this happening please?

Do you think it might make it a little easier if you posted the relevant code? Just a thought.

 

potentially, the namespace will be different between forms?
Also, have you tried without static?

 

Hi. I did not post the code since it is quite long, but below is the part of the code which have to do this this string:

Code in form 1:

public partial class Form_Home : Form
    {

        public static string test;  // initialize string

.........

string Send_code = "a";
serial(test, Send_code);

Code used in form 2:

private void Use_COMport_Click(object sender, EventArgs e)
        {
            test = COMport_to_use.Text.ToString();  
            this.Close();   //Close this form
        }

By the way, I am using this code to interface (or try to) Visual Studio with the PIC microcontroller.

 

potentially, the namespace will be different between forms?
Also, have you tried without static?

Hi, I removed the static and the same error is showing.

 

So where is the error occurring?

What class is private void Use_COMport_Click(object sender, EventArgs e) contained?


And this code:

string Send_code = "a";
serial(test, Send_code)


You really need to provide enough information so people can help you.

 

have you tried referencing the variable through parent.test ?
as your dialog box, i assume, comes up and takes priority (i.e.: you cannot interact with the originating form.)
you are using two separate name spaces though.
i.e.
form1 uses test, has declaration of test etc.
form 2 can see test if it references form1.

I dont have any code at the moment with multiple dialogs (i hate them ) but try referencing it through form1.test or parent.test from the dialog

 

Thanks a lot chrisw1990

Including form1. solved the problem.

Another quick question. If I use 10 buttons on Visual Studio to turn on/off 10 separate LEDs on the PIC, which is the best way to do it?

I was doing it as below:

If button 1 is pressed, send character "a" to the PIC.
If button 2 is pressed, send character "b" to the PIC.
If button 3 is pressed, send character "c" to the PIC.
.......

On the PIC I used if conditions as follows:

If character = a, turn LED 1 on
If character = b, turn LED 2 on
........

Is there another way to do this more efficiently?

Thanks in advance.

 

Is there another way to do this more efficiently?

Defining "efficiently" would help making a sensible reply.

10 symbols for 10 commands maps well, but it makes me wonder if you can turn the LEDs off.

The smallest this would fit into would be a 2 byte quantity, where individual bits ma to individual LEDs.

 

i agree with Ernie, simply for throughput efficiency as 16bits is a lot cheaper than 20bytes.. but it depends how often youre going to be executing this code. your pic can happily sit there with a 20 case switch statement in an interrupt routine when it receives the data if thats all its doing (light load anyway if not all its doing).