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Need to access variables within C# class

Posted on 2010-08-15
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Last Modified: 2013-12-27
In the code below I want to access hLibModule and listner through out the code within the namespace, MyClass. I am getting "Cannot access a non-static member of outer type MyClass.Program' via nested type MyClass.Program.Local' error as the code stands. Can someone please help?

namespace MyClass
{
    public class Program
    {
        IntPtr hLibModule;
        MySecondClass listener;

        public class MyLocal
        {
            public void Init()
            {
                hLibModule = LoadLibrary("MyDLL.dll");
                if (DllRegisterServer() != 0)
                {
                    // MessageBox.Show("Could not initialize the SMSTrap DLL");
                }
                else
                {
                    listener = new MySecondClass ();

                }

            }
        }

        static void Main(string[] args)
        {
            // start SMS text trapping
            MyLocal lcl = new MyLocal ();
            lcl.Init();
           
        }
}
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Question by:atomicgs12
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6 Comments
 
LVL 86

Accepted Solution

by:
Mike Tomlinson earned 2000 total points
ID: 33443119
You'd need to declare "hLibModule" and "listener" as STATIC:

    public static IntPtr hLibModule;
    public static MySecondClass listener;
0
 
LVL 27

Expert Comment

by:nmarun
ID: 33443200
I'm a bit of a traditional programmer in the sense that I like things to be clear and distinct. So, is there a need for you to have nested classes? If not, keep them separate (and in separate files as well).

The way I'd write the Init method is that it would return a IntPtr. This way, my code looks lot more cleaner.

Arun

public class Program
{
    static IntPtr hLibModule;
    static MySecondClass listener;

    static void Main(string[] args)
    {
        // start SMS text trapping
        MyLocal lcl = new MyLocal();
        hLibModule = lcl.Init();

    }

}

public class MyLocal
{
    public IntPtr Init()
    {
        IntPtr hLibModule = LoadLibrary("MyDLL.dll");
        if (DllRegisterServer() != 0)
        {
            // MessageBox.Show("Could not initialize the SMSTrap DLL");
        }
        else
        {
            listener = new MySecondClass();

        }

        return hLibModule;

    }
}

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0
 
LVL 1

Expert Comment

by:funazonki
ID: 33444968
If you want to hide hLibModule from the rest of the app, then the declaration structure is reasonable. In which case simply using

 static IntPtr hLibModule;

will work. Watch out for multi-threading though. If more than one thread can access hLibModule and the code it leads to is not re-entrant you will need to put lock statements round the access
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Author Comment

by:atomicgs12
ID: 33507758
nmarun: - how does 'listener' in Class MyLocal get reconized?
0
 
LVL 27

Expert Comment

by:nmarun
ID: 33513570
Try using 'out' keyword and pass a type of the MySecondClass to the Init method.

hLibModule = lcl.Init(out listener);

public IntPtr Init(MySecondClass listener)
{
    //...
}

Here's more information on the 'out' and 'ref' keywords:
http://geekswithblogs.net/ftom/archive/2008/09/10/c-and-the-difference-between-out-and-ref.aspx

Arun
0
 
LVL 27

Expert Comment

by:nmarun
ID: 33556256
Did this work for you?

Arun
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