This example is composed of three files:

• Source code(usercntrls.cpp)
• Resource definitions(resources.h)
• Resource script(script.rc)

//=============================================================================
//USER CONTROLS (RESOURCES) - Copyright © 2000,2005 Ken Fitlike
//=============================================================================
//API functions used: DialogBox,EndDialog,GetDlgItem,LoadImage,MAKEINTRESOURCE,
//MessageBox,PostMessage,SendMessage,SetWindowText,WinMain.
//=============================================================================
//This demonstrates the creation of user controls on a modal dialog box.
//=============================================================================
#include <windows.h>  //include all the basics
#include <tchar.h>    //string and other mapping macros
#include <string>
#include "resources.h"

//define an unicode string type alias
typedef std::basic_string<TCHAR> ustring;
//=============================================================================
//message processing function declarations
INT_PTR CALLBACK DlgProc(HWND,UINT,WPARAM,LPARAM);
void OnCommand(const HWND,int,int,const HWND);
INT_PTR OnInitDlg(const HWND,LPARAM);

//non-message function declarations
inline int ErrMsg(const ustring&);
//=============================================================================
int WINAPI WinMain(HINSTANCE hInst,HINSTANCE,LPSTR,int)
{
INT_PTR success=DialogBox(hInst,MAKEINTRESOURCE(IDD_DIALOG1),0,DlgProc);

if (success==-1)
  {
  ErrMsg(_T("DialogBox failed."));
  }
return 0;
}
//=============================================================================
INT_PTR CALLBACK DlgProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
switch (uMsg)
  {
  case WM_COMMAND:
    {
    OnCommand(hwnd,LOWORD(wParam),HIWORD(wParam),
              reinterpret_cast<HWND>(lParam));
    return 0;
    }
  case WM_INITDIALOG:
    {
    return OnInitDlg(hwnd,lParam);
    }
  default:
    return FALSE;  //let system deal with msg
  }
}
//=============================================================================
void OnCommand(const HWND hwnd,int id,int notifycode,const HWND hCntrl)
{
//handles WM_COMMAND message of the modal dialogbox
switch (id)
  {
  case IDOK:        //RETURN key pressed or 'ok' button selected
  case IDCANCEL:    //ESC key pressed or 'cancel' button selected
    EndDialog(hwnd,id);
  }
}
//=============================================================================
INT_PTR OnInitDlg(const HWND hwnd,LPARAM lParam)
{
//set the small icon for the dialog. 
SendMessage(hwnd,WM_SETICON,ICON_SMALL,
            reinterpret_cast<LPARAM>(LoadImage(GetModuleHandle(0),
                                               MAKEINTRESOURCE(IDI_ICON1),
                                               IMAGE_ICON,
                                               0,0,LR_DEFAULTCOLOR)));
//add a string to the combobox control
SendMessage(GetDlgItem(hwnd,IDC_COMBOBOX),
            CB_ADDSTRING,0,
            reinterpret_cast<LPARAM>(_T("Drop-down combobox")));     
//add a string to the edit control
SetWindowText(GetDlgItem(hwnd,IDC_EDITTEXT),_T("Edit Control")); 
//add a string to the listbox control
SendMessage(GetDlgItem(hwnd,IDC_LISTBOX),
            LB_ADDSTRING,0,
            reinterpret_cast<LPARAM>(_T("Listbox control")));  
//ensure focus rectangle is properly drawn around control with focus
PostMessage(hwnd,WM_KEYDOWN,VK_TAB,0);
return TRUE;
}
//=============================================================================
inline int ErrMsg(const ustring& s)
{
return MessageBox(0,s.c_str(),_T("ERROR"),MB_OK|MB_ICONEXCLAMATION);
}
//=============================================================================

//=============================================================================
//Resource script constants for User Controls example.
//=============================================================================
#define IDD_DIALOG1                200

#define IDI_ICON1                  301
#define IDC_RADIO1                 302
#define IDC_3STATE                 303
#define IDC_AUTOCHECK              304
#define IDC_AUTORADIOBUTTON        305
#define IDC_CHECKBOX               306
#define IDC_COMBOBOX               307
#define IDC_CTEXT                  308
#define IDC_EDITTEXT               309
#define IDC_GROUPBOX               310
#define IDC_ICONCNTRL              311
#define IDC_LISTBOX                312
#define IDC_LTEXT                  313
#define IDC_RTEXT                  314
#define IDC_SCROLLBAR              315
#define IDC_STATE3                 316

//=============================================================================
//USER CONTROLS - Copyright (c) 2000,2005 Ken Fitlike
//resource script
//
//The controls created use specific resource definition statements which 
//provide default definitions for that control type. By contrast, the CONTROL
//resource definition statement, which can be used to create any control,
//requires more parameters to create a particular control since those same
//default values must be explicitly defined.
//
//Borland's bcc5.5 resource compiler (brc32.exe) requires four arguments 
//specifying the dimensions for the ICON resource definition statement. Other
//resource compilers only require the first two.
//=============================================================================
#if !defined __BORLANDC__
#include <afxres.h>
#endif
#include "resources.h"
//=============================================================================
//Resource languages: Codes for languages and sub-languages are declared in 
//winnt.h eg. for US english replace SUBLANG_ENGLISH_UK with SUBLANG_ENGLISH_US
//eg. for FRENCH replace LANG_ENGLISH with LANG_FRENCH and then replace 
//SUBLANG_ENGLISH_UK with either SUBLANG_FRENCH,SUBLANG_FRENCH_BELGIAN,
//SUBLANG_FRENCH_CANADIAN,SUBLANG_FRENCH_SWISS,SUBLANG_FRENCH_LUXEMBOURG,
//SUBLANG_FRENCH_MONACO depending on which national or regional variation of
//the language corresponds best with your requirements.
//
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_UK  
//=============================================================================
//Dialog
//=============================================================================
IDD_DIALOG1 DIALOGEX 0, 0, 400, 300
STYLE DS_CENTER | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_POPUP | WS_VISIBLE | 
      WS_CAPTION | WS_SYSMENU | WS_THICKFRAME
CAPTION "Resources: User Controls"      
FONT 8, "MS Sans Serif"
  {
  DEFPUSHBUTTON   "OK",IDOK,35,260,50,14
  PUSHBUTTON      "Cancel",IDCANCEL,330,260,50,14
  RADIOBUTTON     "RADIO 1",IDC_RADIO1,30,14,100,16
  AUTO3STATE      "AUTO3STATE",IDC_3STATE,30,30,100,16
  AUTOCHECKBOX    "AUTOCHECKBOX",IDC_AUTOCHECK,30,50,100,16
  AUTORADIOBUTTON "AUTORADIOBUTTON",IDC_AUTORADIOBUTTON,30,70,100,16
  CHECKBOX        "CHECKBOX",IDC_CHECKBOX,30,90,100,16
  COMBOBOX        IDC_COMBOBOX,30,120,100,90,CBS_DROPDOWN
  CTEXT           "CTEXT",IDC_CTEXT,30,140,100,16
  EDITTEXT        IDC_EDITTEXT,30,160,100,16
  GROUPBOX        "GROUPBOX",IDC_GROUPBOX,4,4,392,292
  ICON            "IDI_ICON",IDC_ICONCNTRL,30,180,0,0
  LISTBOX         IDC_LISTBOX,30,200,100,60
  LTEXT           "LTEXT",IDC_LTEXT,220,10,100,16
  RTEXT           "RTEXT",IDC_RTEXT,220,50,100,16
  SCROLLBAR       IDC_SCROLLBAR,220,70,100,16
  STATE3          "STATE3",IDC_STATE3,220,90,100,16
  }
//=============================================================================
//Images (icons)
//=============================================================================
//MinGW: can't use same id for icon in dlgbox static(ICON) cntrl as app icon.
IDI_ICON   ICON  "icon1.ico"  //used for ICON control
IDI_ICON1  ICON  "icon1.ico"  //used as icon for dialogbox
//=============================================================================