modeless dialog variable passing

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I have a modeless dialog that I am calling in my program. Would like to initialize the controls on the child dialog from the parent. The child form opens and closes properly. What I am would like to do is to initialize the Edit controls with strings from the parent. How do I make the parent visible?

I call this from the parent:

C#

void CBudgetDlg::OnViewUnpaidExpenses()
{
    // TODO: Add your command handler code here

    if (pUnpaidExpenses == NULL)
    {
        pUnpaidExpenses = new CUnpaidExpDlg(this);
    }
    else
    {
        delete pUnpaidExpenses;
        pUnpaidExpenses = NULL;
        pUnpaidExpenses = new CUnpaidExpDlg(this);
    }
}

This is the child:

C#

CUnpaidExpDlg::CUnpaidExpDlg(CWnd* pParent /*=NULL*/)
    : CDialog(CUnpaidExpDlg::IDD, pParent)
{
    if(Create(CUnpaidExpDlg::IDD,pParent))
    {
        ShowWindow(SW_SHOW);
    }
    my_string = _T("");
}

[edit]
For example if I have CString m_string in the parent dialog and I want to pass the value to the child dialog CString my_string. Here is what I am trying to do. Not sure how to code it.

C++

CUnpaidExpDlg::CUnpaidExpDlg(CWnd* pParent /*=NULL*/)
    : CDialog(CUnpaidExpDlg::IDD, pParent)
    ,my_string = CBudgetDlg.m_string;
{
    if(Create(CUnpaidExpDlg::IDD,pParent))
    {
        ShowWindow(SW_SHOW);

    }
}

Posted 5-Jan-15 9:07am

Member 8605996

Updated 6-Jan-15 5:19am

Richard MacCutchan

v3

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Comments

Richard MacCutchan 6-Jan-15 5:35am

Pass the information to the dialog object in the constructor, or add some methods to pass data in.

Member 8605996 6-Jan-15 10:33am

For example if I have CString m_string in the parent dialog and I want to pass the value to the child dialog CString my_string. Here is what I am trying to do. Not sure how to code it.

CUnpaidExpDlg::CUnpaidExpDlg(CWnd* pParent /*=NULL*/)
: CDialog(CUnpaidExpDlg::IDD, pParent)
,my_string = CBudgetDlg.m_string;
{
if(Create(CUnpaidExpDlg::IDD,pParent))
{
ShowWindow(SW_SHOW);

}
}

Richard MacCutchan 6-Jan-15 11:24am

You would need to add an extra parameter to your constructor to accept the string variable. Your constructor would then look like:


CUnpaidExpDlg::CUnpaidExpDlg(CWnd* pParent /*=NULL*/, CString theString)
: CDialog(CUnpaidExpDlg::IDD, pParent)
{
    my_string = theString;
...

Member 8605996 8-Jan-15 12:43pm

I am able to do this now. Now I would like to send a structure to the child to initialize it. What is the best way to do this?

Richard MacCutchan 8-Jan-15 13:41pm

Sending a structure is exactly the same as sending a string, or any other object, between classes.

Member 8605996 7-Jan-15 9:38am

Have not been able to make you solution work.

I have made this modification to the section that starts my child dialog. Looked at pMainWnd and pView and they are pointing to the parent dialog. I created a global m_my_test in the parent. When I try and access m_my_test the compiler says it is undefined. How do I code it so it can be seen?

CUnpaidExpDlg::CUnpaidExpDlg(CWnd* pParent /*=NULL*/)
: CDialog(CUnpaidExpDlg::IDD, pParent)
{
CBudgetDlg *pMainWnd = (CBudgetDlg *)AfxGetMainWnd();
if (pMainWnd != NULL)
{
CWnd* pView = pMainWnd;
if(pView != NULL)
{
//my_string = m_my_test;
my_string = "Randy";
}
}

if(Create(CUnpaidExpDlg::IDD,pParent))
{

ShowWindow(SW_SHOW);
}
my_string = _T("");
}

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Albert Holguin · Answer 1 · 2015-01-06T07:09:00

If the child dialog only needs the values once while being constructed, then you can pass arguments like Richard mentioned above, or add some of public interface for passing variables (add some public get/set methods, if you need to pass a lot of variables, enclose them in a structure). If you need the variables to be set while the dialog is up, add messaging to the child dialog and pass data through Windows messages/handlers. Messages give you the advantage that they can easily handle either synchronous calls or asynchronous calls.