Simple use of combo box (win32)

 

A Brief Introduction to combo box Functions

 

1. The sendmessage function sends messages to the window.

Lresult sendmessage (

Hwnd, // handle to destination window

Uint MSG, // message

Wparam, // first Message Parameter

Lparam // second Message Parameter

);

 

2. Add data to combo box

Hwnd hwndcombobox = getdlgitem (hwnd, idc_combo1 );

Tchar szmessage [20] = "hello ";

Sendmessage (hwndcombobox, cb_addrstring, 0, (lparam) szmessage );

 

3. insert data to the combo box

Hwnd hwndcombobox = getdlgitem (hwnd, idc_combo1 );

Tchar szmessage [20] = "world ";

Sendmessage (hwndcombobox, cb_insertrstring, 0, (lparam) szmessage );

 

4. delete data from combo box

Sendmessage (hwndcombobox, cb_deletestring, 1, 0); // Delete the second data item

 

5. Clear all combo box data

Sendmessage (hwndcombobox, cb_resetcontent, 0, 0 );

 

6. Get the number of combo box data items

Uint ucount;

Ucount = sendmessage (hwndcombobox, cb_getcount, 0, 0 ):

 

7. Obtain the value of a combo box item.

Tchar szmessage [200];

Zeromessage (szmessage, sizeof (szmessage )):

Sendmessage (hwndcombobox, cb_getlbtext, 1, (lparam) szmessage); // obtain the data of the second item

MessageBox (null, szmessage, "", mb_ OK );

 

Two Combo box for simple use

1. The interface design is shown in figure

 

2. function implementation code (a simple Win32 project is created)

// ComboBox. CPP # include "stdafx. H "# include" resource. H "lresult callback Dialog (hwnd, uint, wparam, lparam); int apientry winmain (hinstance, hinstance hprevinstance, lpstr lpcmdline, int ncmdshow) {// todo: Place code here. dialogbox (hinstance, (lpctstr) idd_dialog1, null, (dlgproc) DIALOG); Return 0;} lresult callback Dialog (hwnd, uint umessage, wparam, lparam) {Switch (umessage) {case when: Return true; Case wm_command: uint usender; usender = loword (wparam); hwnd hwndcombobox; hwndcombobox = getdlgitem (hwnd, idc_combo1 ); tchar szbuff [200]; zeromemory (szbuff, sizeof (szbuff); Switch (usender) {// cb_addstring is the last added data case when: getdlgitemtext (hwnd, idc_edit1, szbuff, sizeof (szbuff); sendmessage (hwndcombobox, cb_addstring, 0, (lparam) szbuff); break; // cb_addstring is used to add data case when: getdlgitemtext (hwnd, idc_edit1, szbuff, sizeof (szbuff); sendmessage (hwndcombobox, expires, 0, (lparam) szbuff); break; Case idc_button3: sendmessage (hwndcombobox, cb_resetcontent, 0, 0); break; case idc_button4: uint ucount; ucount = sendmessage (hwndcombobox, cb_getcount, 0, 0); setdlgitemint (hwnd, idc_edit2, ucount, true); break; Case idc_button5: uint uselect; uselect = getdlgitemint (hwnd, idc_edit2, null, true); sendmessage (hwndcombobox, cb_getlbtext, uselect, (lparam) szbuff); MessageBox (hwnd, szbuff, "show ", mb_ OK | mb_iconinformation); break; Case idok: enddialog (hwnd, lparam); break;} break; Case wm_close: enddialog (hwnd, lparam); break;} return false ;}