Stopping new windows from being made when one just like it is already made

[aewarnick]

How do I do that?

[Derek Stone]

Pass a reference of the class (the form/window) instead of creating a new instance.

[aewarnick]

I do not know what you mean. Can you give an example.

 

I also need to have a way to test and see if the form is open or not (bool method probably).

[Derek Stone]

We're going to need more specific details. What exactly are you trying to do? A code snippet would help significantly.

[aewarnick]

I have a form with textboxes that will only hold text without @Old at the end of the file. If a file does have @Old at the end it goes to the Rich Text Box of the PrintView form easy printing.

 

if(Old)

{

PrintViewForm P=new PrintViewForm();

P.GetItFromFile(file);

P.Show();

}

 

The problem is that it is in a loop and need to be in a loop to work correctly. So, I need one to initially be created and all others to append to the text in that same one.

 

The loop circles again and again so I cannot just put the initialization outside the loop I need to learn how to reference a form and how to check if one is already open or not.

[Derek Stone]

PrintViewForm P;
if(Old) {
   if(P = null) {
       P = new PrintViewForm();
   }
    // Your code here
}

[aewarnick]

It would not compile like this:

 

if(Old)

{

PrintViewForm P;

if(P==null)

{

P=new PrintViewForm();

P.GetItFromFile(FileArr[k]);

P.Show();

}

else P.GetItFromFile(FileArr[k]);

 

Says, use of unassigned local variable P and when I assigned P to null it compiles but a whole bunch of forms pop up like before.

 

I have an idea, maybe I can do a search for the PrintViewForm type. But how?

Edited March 1, 2003 by aewarnick

[aewarnick]

How absent minded of me!!! All I had to do is put PrintViewForm P=null; outside the loop and that solved everything.