Accessing or sending my data from/to a modal dialog with a listCtrl

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Having a bit of an issue accessing my data in order to populate my list control. In my view, I can access my data like this:

C++

myDataArray& myData = GetData();

m_wndFirstName.SetWindowText(myData[nPosition].m_sFirstName);

But, when I create a dialog with a list control, I can not access any data the way that I normally would in my main view. I have overridden OnInitDialog to create my column headers and I can write text directly to it, but I need to use my variables like I would in my view class.

How can I link these classes together??

Posted 26-Jul-12 15:15pm

DrBones69

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3 solutions

Solution 2

Just extend your dialog's constructor :) :

C++

CYourDialog : public CDialog
{
  const myDataArray* m_pcData;

  enum { id = IDD_YOURDIALOG };

public:
  CYourDialog(CWnd* pcParent, const myDataArray* pcData)
    : CDialog(pcParent, id), m_pcData(pcData) { ASSERT(m_pcData); }

  virtual BOOL OnInitDialog(); // the Data pointer could be used here
};

Posted 27-Jul-12 0:28am

Eugen Podsypalnikov

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Christian Graus · Accepted Answer · 2012-07-26T15:27:00

Solution 1

Your best bet is to NOT tie them together, but have them both pull data from a third class which exists to expose the data to any class that needs it.

Posted 26-Jul-12 15:27pm

Christian Graus

Comments

DrBones69 26-Jul-12 21:34pm

Not to sound dumb, but if I can't figure out how to get one class to do this, how do I accomplish your suggestion?

Christian Graus 26-Jul-12 21:40pm

The methods would have to be static, so you don't need to deal with trying to provide access to a class instance. Or they could take an id of the data set to load, and you could pass that id in to the constructor of your new dialog.

DrBones69 26-Jul-12 22:18pm

Are you talking about a friend class?

Christian Graus 26-Jul-12 22:19pm

No. It could be, if you want to hide it from anything that you've not given it access to, but that's an extra layer to add.

DrBones69 26-Jul-12 22:43pm

I'm soooooo confused!!! I think I'll hit the sack and maybe it will come to me in my sleep as usual. I guess I'm not following your exact meaning or maybe I'm letting my years of Cobol have too much influence over OOP. Sometimes I need things spelled out. Thanks

Christian Graus 26-Jul-12 22:45pm

OK - right now you have a form, and it contains code to access data. This is poor design to start with, but, it means the obvious solution is to pass this form to your new form, so the methods can be called there. Instead, you need a data access class, which either works using data you pass from your other form, or is static so you can access it from both forms. I would go with approach a, methods that look like 'GetDataForObject(int id)'. Then you can just pass a number around between constructors, and your new form has all the info it needs to go to the data provider and ask for the data it needs.

DrBones69 · Accepted Answer · 2012-07-29T17:43:00

Ok, it turns out that I did not need to create anything special, all I had to do was create some variables and another array in my dialog class. Then copy my data from my main array to the new one. I also found that I can copy anything from my view class my accessing my dialog class through my view class like:

C++

VIEW CLASS

dlg.AnyVariableInMyDialogClass = myDataArray[nPos].m_AnyVariable;

OR load an array like this:

C++

dlg.myDataArray.Add(myData[nPos].m_sFirtName);
...
...
...

I did get a little more creative than the examples above, but I think you'll get the point.

Any comments or suggestions are welcome.