instance of form does not pass values to another form 1

[nishasp]

I have created on instance of form2 in form1 and need to pass a string value across. However my object does not hold any values of the variables from form2 and shows these as being 0. I have declared the instance of form2 within the Members region of my code and assigned a string to the object that i wish to access. This returns a null value for the string. I am sure that its something silly that i have missed out...please help!!

Thanks in advance...

 

[DaZZleD]

is this how you store the values?

public string resultString
{
	get
	{
		return JIGString[JIGString.Count-1].ToString();
	}
	set
	{
		JIGString.Add(value);
	}
}

because I've just tried it and it works perfectly...

 

[nishasp]

Yes!

In form2 i have set
parentForm.resultString = StartRemoteTest.ToString();

I remove this value from the arraylist once i have used it in form1, so the count will only ever be say 30 and 31.

 

[DaZZleD]

then the problem is when you remove the used value. provide the code you use there because the wrong value gets removed probably.

 

[nishasp]

private void WaitTimer_Tick(object sender,System.EventArgs
e)
{
if((this.Port.IsOpen) && (iJIGMsgString <32))
{
//SendStr("a10e<2");
if(JIGString.Count == 31)
{
SendStr(JIGString[iJIGMsgString].ToString());

iJIGMsgString++;
if(iJIGMsgString >=31) //keeps on polling
{
JIGString.RemoveAt(30);
iJIGMsgString = 0;
}
}
else
{
SendStr(JIGString[iJIGMsgString].ToString());
iJIGMsgString++;
if(iJIGMsgString >=30) //keeps on polling
{
iJIGMsgString = 0;
}
}
}
}

 

[DaZZleD]

you always remove the last value therefore, in your scenario, you add a value from the 1st instance of Form2 (let's call it Form2_1) at position (let's say) 29. you don't delete anything yet because count is not greater than or equal to 30. Then when you add a value from the second form (Form2_2), it gets added at position 30 so the count becomes 31. Then you delete the value at position 30 so what you actually do, is remove the value from Form2_2 and have the value from Form2_1 as last value in your array.

You should try to remove values form the start of the array and keep adding at the end of it (like in a FIFO queue)

 

[nishasp]

It's really weird, but i restarted the computer and now the messages seem to be going through fine!

So, thanks for that anyway!

 

[nishasp]

And another question again...

I have the button control array that opens up different instances of form2. The problem is that if i click on a button more than once, it will keep opening up that same form. I need to click on a button, open up its associated form and only when it is closed can it be open again. How would i do that?

Secondly, i now need to pass values from form1 to a particular instance of form2, depending on which form number test box responds to a polling message. I set up a property on form2 to print the value and passed it across, and it shows up, but on a new instance of form2 and not the form associated with the button tag. Does this make any sense??

Please help me!!!

 

[chiph]

nihasp -
Use the "new" operator to get a new instance of your form.

Chip H.


____________________________________________________________________
If you want to get the best response to a question, please read FAQ222-2244 first

 

[nishasp]

I don't want a new instance of the form as this then doesn't have the associated tag value that indexes the buttons. I have tried to create a new instance of form2 in form1, but then i am unable to get multiple instances of the same form...

 

[chiph]

Can't have one without the other, sorry.

If you want a new instance, you'll have to provide a way to set the tag values.

Chip H.


____________________________________________________________________
If you want to get the best response to a question, please read FAQ222-2244 first