Drop down list of combo box is not showing item added to it by SendMessage()

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Drop down list of combo box is not showing item added to it by SendMessage()

This is Dialog box which contains combo box

C++

BOOL CALLBACK AddRuleDlgProc (HWND hAddRuleDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	 const char *ComboBoxItem[] = {"All","TCP","UDP","ICMP"};
         case WM_INITDIALOG :
         for(i=0;i<3;i++)
         {	 SendMessage((GetDlgItem(hAddRuleDlg,IDC_COMBO4)),CB_ADDSTRING,0,reinterpret_cast<LPARAM>((LPCSTR)ComboBoxItem[i]));
         }
         return TRUE ;
}

This is resource of combo box

C++

COMBOBOX        IDC_COMBO4,81,151,44,49,CBS_DROPDOWNLIST | CBS_OWNERDRAWVARIABLE | WS_VSCROLL | WS_TABSTOP

Please help me asap

Posted 10-Mar-12 23:13pm

amityadav4a

Updated 12-Mar-12 19:18pm

v3

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Comments

enhzflep 11-Mar-12 7:48am

I'd also suggest that you use SendDlgItemMessage function.
i.e
SendDlgItemMessage(hAddRuleDlg, IDC_COMBO4, CB_ADDSTRING, (LPARAM)ComboBoxItem[i]);

3 solutions

Solution 2

If you need to use the ownerdrawn-style (so removing it as Richard suggested won't work for you) then try adding CBS_HASSTRINGS (Combo-Box Styles[^].

Posted 11-Mar-12 1:16am

Code-o-mat

Comments

amityadav4a 13-Mar-12 10:46am

Not working any ways. What can i do now?

Code-o-mat 13-Mar-12 10:51am

Are you measuring and drawing the items yourself?

Solution 3

Can u try this..

SendMessage(hWndComboBox,CB_ADDSTRING,0,
reinterpret_cast<LPARAM>LPCTSTR)ComboBoxItem[0]));

SendMessage(hWndComboBox,CB_ADDSTRING,0,
reinterpret_cast<LPARAM>((LPCTSTR)ComboBoxItems[1]));

SendMessage(hWndComboBox,CB_ADDSTRING,0,
reinterpret_cast<LPARAM>((LPCTSTR)ComboBoxItems[2]));

SendMessage(hWndComboBox,CB_ADDSTRING,0,
reinterpret_cast<LPARAM>((LPCTSTR)ComboBoxItems[3]));

Posted 12-Mar-12 21:29pm

Guru_C++

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Richard MacCutchan · Accepted Answer · 2012-03-11T00:16:00

Solution 1

You are using CBS_OWNERDRAWVARIABLE (see here[^]) which means that you are expected to supply the items for the list on demand when the combobox is dispalyed or updated. Remove this option and try again.

Posted 11-Mar-12 0:16am

Richard MacCutchan

Comments

amityadav4a 13-Mar-12 10:57am

It worked after removing CBS_OWNERDRAWVARIABLE but have to change SendMessage((GetDlgItem(hAddRuleDlg,IDC_COMBO4)),CB_ADDSTRING,0,reinterpret_cast<lparam>(TEXT("amit"));