Go4Expert - How to create variable for a dynamically created combo box

Go4Expert (http://www.go4expert.com/)

- Win32 (http://www.go4expert.com/forumdisplay.php?f=48)

- - How to create variable for a dynamically created combo box (http://www.go4expert.com/showthread.php?t=8737)

How to create variable for a dynamically created combo box

I have written this code and now i have dynamically create combo box.

Code:





BOOL CProjectDlg::OnInitDialog()

{

    CDialog::OnInitDialog();



    SetIcon(m_hIcon, TRUE);

    SetIcon(m_hIcon, FALSE);



    // TODO: Add extra initialization here



 CComboBox *Combo = new CComboBox;

   Combo->Create(WS_CHILD | WS_VISIBLE |

   WS_VSCROLL | CBS_DROPDOWNLIST,

   CRect(10, 50, 100, 150), this, 0x1448);



   Combo->AddString("First");

   Combo->AddString("Second");

   Combo>AddString("Third");



return TRUE; // return TRUE unless you set the focus to a control

}

When a user clicks an item in the combo box to select it, I want to find out what the user clicked.
I am interested in the string that the user selected in the combo box,but i need variable for this dinamically created combo box.
My question is how to create a variable.

I hope you understand what i want to do and i am sorry for my bad English

Re: How to create variable for a dynamically created combo box

Make Combo box pointer class variable and then get the selected item from the combo box variable

Re: How to create variable for a dynamically created combo box

Thank you, but I have been learning Visual C++, WInApi and MFC for not long time I don't know how to do it.
Can you tell me how to make Combo box pointer class variable and then get the selected item from the combo box variable

Re: How to create variable for a dynamically created combo box

You should then be doing your hands on with C++ because how to put a variable in a class is nothing to do with VC++. The variable pointer you declared in your above code should be moved to CProjectDlg class member variable.

Re: How to create variable for a dynamically created combo box

This is what I made.

ProjectDlg.h file

Code:

class CProjectDlg : public CDialog

{





        private:

  CComboBox *Combo;

// Construction

public:

        CSixDlg(CWnd* pParent = NULL);        // standard constructor

...

...

...

ProjectDlg.cpp

Code:

BOOL CProjectDlg::OnInitDialog()

{

    CDialog::OnInitDialog();



    SetIcon(m_hIcon, TRUE);

    SetIcon(m_hIcon, FALSE);



    // TODO: Add extra initialization here



 Combo = new CComboBox;

  Combo->Create(WS_CHILD | WS_VISIBLE |

  WS_VSCROLL | CBS_DROPDOWNLIST,

  CRect(10, 50, 100, 150), this, 0x1448);



  Combo->AddString("First");

  Combo->AddString("Second");

  Combo->AddString("Third");





return TRUE; // return TRUE unless you set the focus to a control

}

Can you help me further? Or give me a link with this information

Re: How to create variable for a dynamically created combo box

Quote:

Originally Posted by stp (Post 23977)

This is what I made.

ProjectDlg.h file

Code:

class CProjectDlg : public CDialog

{





        private:

  CComboBox *Combo;

// Construction

public:

        CSixDlg(CWnd* pParent = NULL);        // standard constructor

...

...

...

ProjectDlg.cpp

Code:

BOOL CProjectDlg::OnInitDialog()

{

    CDialog::OnInitDialog();



    SetIcon(m_hIcon, TRUE);

    SetIcon(m_hIcon, FALSE);



    // TODO: Add extra initialization here



 Combo = new CComboBox;

  Combo->Create(WS_CHILD | WS_VISIBLE |

  WS_VSCROLL | CBS_DROPDOWNLIST,

  CRect(10, 50, 100, 150), this, 0x1448);



  Combo->AddString("First");

  Combo->AddString("Second");

  Combo->AddString("Third");





return TRUE; // return TRUE unless you set the focus to a control

}

Can you help me further? Or give me a link with this information

First you need to create a function for the combo box change event to hold, you can do so by going to the CProjectDlg.h (corresponding header file) and then writing a function : afx_msg void changedcombo(); where changedcombo() is the name of the combobox we will be using. Then return to the corresponding .cpp file, in your case CProjectDlg.cpp and declare the following function inside BEGIN_MESSAGE_MAP(), which should be a predefined function in the class as: ON_CBN_SELCHANGE(0x1448,&CProjectDlg::OnComboChang ed). Now is the time to define the funtion, we can do so by writing our funtion as void CProjectDlg::OnComboChanged(){ } and inside the funtion we can type int nIndex = Combo->GetCurSel();
CString str;
Combo->GetLBText(
nIndex, str);
and get the current item selected. Hope this helps.