After initializing a DDF buffer with DdfInitialize, the example uses DdfHyperText to create a hypertext link with another resource. For a more detailed example and discussion of initializing DDF, see the DdfInitialize sample.

#define INCL_WINWINDOWMGR       /* General window management    */
#define INCL_WINMESSAGEMGR      /* Message management           */
#define INCL_DDF                /* Dynamic Data Facility        */
#include <os2.h>
#include <pmhelp.h>

PSZ    Text = "This text is a HYPERTEXT message.\n"; /* hypertext string  */
PSZ    ResID = "1";     /* Resource identifier                  */

MRESULT WindowProc( HWND hwnd, ULONG ulMsg, MPARAM mp1, MPARAM mp2 )
{
    HWND   hwndParent;
    HWND   hwndInstance;
    HDDF   hDdf;            /* DDF handle                           */

    switch( ulMsg )
    {
    case HM_QUERY_DDF_DATA:
        /* get the help instance */
        hwndParent = WinQueryWindow( hwnd, QW_PARENT );
        hwndParent = WinQueryWindow( hwndParent, QW_PARENT );
        hwndInstance = (HWND)WinSendMsg( hwndParent, HM_QUERY,
                                 MPFROMSHORT( HMQW_INSTANCE ), NULL );

        /* Allocate 1K Buffer (default)  */
        hDdf = DdfInitialize(
                    hwndInstance,  /* Handle of help instance */
                    0L,            /* Default buffer size     */
                    0L             /* Default increment       */
                    );

        if (hDdf == NULLHANDLE)       /* Check return code       */
        {
            return (MRESULT)FALSE;
        }

        /* create hypertext link with resource 1 */
        if (!DdfHyperText(hDdf, (PSZ)Text, ResID, REFERENCE_BY_RES))
        {
            return (MRESULT)FALSE;
        }

        return (MRESULT)hDdf;
    }
}