CreateWindowEx()で作ったウィンドウを全て閉じるには？ (ID:68875)

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こんな感じのことですか？
#include     <windows.h>
#include     "resource.h"

INT_PTR CALLBACK DialogProc ( HWND, UINT, WPARAM, LPARAM ) ;
HINSTANCE hInst ;
HWND hItem[ 3 ] ;

int WINAPI WinMain ( HINSTANCE hInstance, HINSTANCE, LPSTR, int )
{
    hInst = hInstance ;
    DialogBox ( hInstance, MAKEINTRESOURCE ( IDD_DIALOG1 ), NULL, DialogProc ) ;
    return 0 ;
}

INT_PTR CALLBACK DialogProc ( HWND hDlg, UINT msg, WPARAM wParam, LPARAM lParam )
{

switch ( msg )
    {
    case WM_INITDIALOG :
        
        hItem[0] = CreateWindowEx ( 0, TEXT( "button" ), TEXT( "button0" ),
            WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
            10, 10, 90, 30, hDlg, ( HMENU ) 0, hInst, 0 ) ;

hItem[1] = CreateWindowEx ( 0, TEXT( "button" ), TEXT( "button1" ),
            WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
            10, 50, 90, 30, hDlg, ( HMENU ) 1, hInst, 0 ) ;

hItem[2] = CreateWindowEx ( 0, TEXT( "button" ), TEXT( "button2" ),
            WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
            10, 90, 90, 30, hDlg, ( HMENU ) 2, hInst, 0 ) ;
        return TRUE ;

case WM_COMMAND :
        switch ( LOWORD ( wParam ) )
        {
        case IDOK :
            for ( int i = 0 ; i < ARRAYSIZE ( hItem ) ; i++ )
            {
                DestroyWindow ( hItem[ i ] ) ;
            }
            break ;
        case IDCANCEL :
            EndDialog ( hDlg, 0 ) ;
            break ;
        }
        return TRUE ;

case WM_CLOSE :
        EndDialog ( hDlg, 0 ) ;
        return TRUE ;
    }

return FALSE ;
}

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