how to check if item is selected from a comboBox in C

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I have a dynamic UI in which a combobox(dropdown) is geting created.
how to check if an item is selected from a comboBox.
Any Help
Thanks in advance

Posted 16-Aug-12 19:15pm

Midhun PB

Updated 16-Aug-12 19:16pm

v2

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3 solutions

Solution 1

SQL

if comboBox1.SelectedItem != null)
                { //Do Somthing}

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Posted 16-Aug-12 19:48pm

Member 9120792

Solution 2

See here: http://msdn.microsoft.com/en-us/library/windows/desktop/bb775792(v=vs.85).aspx

You need the Combobox_GetCurSel macro, perhaps Combobox_GetTextLen & Combobox_GetText too.

Posted 16-Aug-12 20:06pm

enhzflep

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Midhun PB 17-Aug-12 2:17am

Thanksfor the reply..
My problem is since it is a dynamic UI,and combobox is not defined. the values are added as -
LoadString(Class::LoadLib,IDS_XXX,String,100);
where where LoadLib is a static HMODULE.
I have tried string.IsNullOrEmpty options.but not working

enhzflep 17-Aug-12 2:57am

Doesnt matter, just use GetDlgItem(parentsHwnd, combo_id) to get its window.
You must have some way of identifying it at runtime - use that as a means to get its Hwnd.

Is this really plain C/C++? Your latest response tends to indicate otherwise. Please re-tag question if appropriate - I.e wpf, cli.

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pasztorpisti · Accepted Answer · 2012-08-16T23:15:00

If you created the combobox dynamically then you have the HWND of the combobox child window (that is the return value of CreateWindowEx) so you dont have to issue GetDlgItem() to get its HWND! You communicate with the combobox by sending messages to that HWND!

Here is a set of combobox related messages:
http://msdn.microsoft.com/en-us/library/windows/desktop/bb775845%28v=vs.85%29.aspx[^]

You have to send CB_GETCURSEL message to the HWND of your combobox to find out if an item is selected:

C++

int selected_index = (int)SendMessage(hwnd_combo, CB_GETCURSEL, 0, 0);
if (selected_index == CB_ERR)
{
    // there is no item selected
}