Example using DDF

/* DDF Sample */

#define INCL_GPIPRIMITIVES
#define INCL_WINHELP
#define INCL_WIN
#define INCL_DDF
#include <os2.h>
#include "ddf.h"

MRESULT EXPENTRY ClientWndProc( HWND, USHORT, MPARAM, MPARAM );
VOID HelpInit( HAB hab );

HWND hwndHelpInstance;

HELPSUBTABLE helpSubTableMAIN[ ] =
{
   2, 0, 0
};

HELPTABLE helpTableMAIN[ ] =
{
      ID_PRIMWIN, helpSubTableMAIN, EXT_HELP_PANEL,
};

VOID main()
{
   static ULONG flFrameFlags = FCF_TITLEBAR | FCF_SYSMENU | FCF_TASKLIST |
                               FCF_SIZEBORDER  | FCF_SHELLPOSITION |
                               FCF_MINBUTTON | FCF_MAXBUTTON;


   HAB hab;
   HMQ hmq;
   QMSG qmsg;
   HWND hwndFrame, hwndClient;
   BOOL bReturnCode;

   hab = WinInitialize( 0 );             /* Get anchor block */
   hmq = WinCreateMsgQueue( hab, 0 );    /* Create message queue */

   bReturnCode = WinRegisterClass( hab,                   /* Anchor Block */
                                   "ClientWindow",        /* Class name   */
                                   (PFNWP) ClientWndProc, /* Window Proc  */
                                   CS_SIZEREDRAW,         /* Classstyles  */
                                   0 );                   /* Extra data   */
   hwndFrame = WinCreateStdWindow( HWND_DESKTOP,           /* parent */
                                   WS_VISIBLE,             /* window styles */
                                   &flFrameFlags,         /* FCF values */
                                   "ClientWindow",        /* class */
                                   "Press F1 for a DDF Sample", /* titlebar text */
                                   0L,                    /* client styles */
                                   NULLHANDLE,            /* resource handle */
                                   ID_PRIMWIN,            /* ID */
                                   &hwndClient );         /* return client */

   /* Initialize Help */
   HelpInit( hab );
   /* Associate the help instance with the window */
   WinAssociateHelpInstance( hwndHelpInstance, hwndFrame );

   while ( WinGetMsg( hab, &qmsg, NULLHANDLE, 0, 0 ) )    /* message loop */
       WinDispatchMsg( hab, &qmsg );

   /* Destroy the help instance */
   WinDestroyHelpInstance( hwndHelpInstance );

   WinDestroyWindow( hwndFrame );      /* destroy window        */
   WinDestroyMsgQueue( hmq );          /* destroy message queue */
   WinTerminate( hab );                /* return anchor block   */
}

MRESULT EXPENTRY ClientWndProc( HWND hwnd, USHORT msg, MPARAM mp1, MPARAM mp2)
{
   HPS hps;
   ULONG ulResID;
   HDDF hDDF;
   HBITMAP hbm;
   APIRET returncode;
   ERRORID errcode;

   switch ( msg ) {
      case HM_INFORM:
         switch (SHORT1FROMMP(mp1)) {
         case 1:
            WinMessageBox( HWND_DESKTOP, HWND_DESKTOP, "You clicked on the link",
                          "DDF Sample", 0, MB_OK);
            break;
         default:
            WinMessageBox( HWND_DESKTOP, HWND_DESKTOP, "Unknown Inform link",
                          "DDF Sample", 0, MB_OK);
           break;
         } /* endswitch */
      break;
      case HM_QUERY_DDF_DATA:
         ulResID = LONGFROMMP( mp2 );
         /* Initialize DDF */
         hDDF = DdfInitialize( hwndHelpInstance, 0L, 0L);
         /* Check res id to see which DDF line */
         switch (ulResID) {
            case 1:
               DdfPara( hDDF);
               DdfText( hDDF, "This text was placed by DDF");
               DdfPara( hDDF);
               DdfText( hDDF, "You can use ");
               DdfSetFontStyle( hDDF, FM_SEL_ITALIC);
               DdfText( hDDF, "italic, ");
               DdfSetFontStyle( hDDF, FM_SEL_BOLD);
               DdfText( hDDF, "bold, ");
               DdfSetFontStyle( hDDF, FM_SEL_UNDERSCORE);
               DdfText( hDDF, "underscore, ");
               DdfSetFontStyle( hDDF, FM_SEL_UNDERSCORE | FM_SEL_ITALIC | FM_SEL_BOLD );
               DdfText( hDDF, "or all three!");
               DdfSetFontStyle( hDDF, 0);
               DdfPara( hDDF);
               DdfText( hDDF, "How about some color?");
               DdfPara( hDDF);
               DdfSetColor( hDDF, CLR_BLUE, CLR_RED);
               DdfText( hDDF, "Red on Blue\n");
               DdfSetColor( hDDF, CLR_BLACK, CLR_PALEGRAY);
               DdfText( hDDF, "Pale Gray on Black\n");
               DdfSetColor( hDDF, CLR_DEFAULT, CLR_DEFAULT);
               DdfPara( hDDF);
               DdfSetFont( hDDF, "Courier", 100, 100);
               DdfText( hDDF, "Or a font change?");
               DdfSetFont( hDDF, NULL, 1, 1);
               DdfPara( hDDF);
               DdfSetTextAlign( hDDF, TA_CENTER);
               DdfSetFormat( hDDF, FALSE);
               DdfText( hDDF, "We can\ncenter text");
               DdfSetFormat( hDDF, TRUE);
               DdfSetTextAlign( hDDF, TA_LEFT);
               hbm = WinGetSysBitmap( HWND_DESKTOP, SBMP_FOLDER);
               DdfPara( hDDF);
               DdfBitmap( hDDF, hbm, ART_RUNIN );
               DdfText( hDDF, "Perhaps a bitmap?" );
               DdfPara( hDDF);
               DdfText( hDDF, "Or a list?");
               DdfBeginList(hDDF, 15, HMBT_FIT, HMLS7us.SINGLELINE);
               DdfListItem( hDDF, "Item 1", "Item 1 Description");
               DdfListItem( hDDF, "Item 2", "Item 2 Description");
               DdfEndList( hDDF);
               DdfPara( hDDF);
               DdfText( hDDF, "You can even create a " );
               DdfHyperText( hDDF, "link to a panel ", "2", REFERENCE_BY_RES );
               DdfText( hDDF, "or an " );
               DdfInform( hDDF, "inform link", 1 );
               /* Return the DDF handle you just created */
               return (MRESULT) hDDF;
               break;
         } /* endswitch */
         break;
      case WM_PAINT:
         hps = WinBeginPaint( hwnd, NULLHANDLE, NULL );
         GpiErase( hps );
         WinEndPaint( hps );
         return 0;
         break;
   } /* endswitch */
   return WinDefWindowProc( hwnd, msg, mp1, mp2 );
}

VOID HelpInit( HAB hab )
{
   HELPINIT helpinit;

   helpinit.cb = sizeof( HELPINIT );
   helpinit.ulReturnCode = 0L;
   helpinit.pszTutorialName = NULL;
   helpinit.phtHelpTable = (PVOID) helpTableMAIN;
   helpinit.hmodHelpTableModule = 0;
   helpinit.hmodAccelActionBarModule = 0;
   helpinit.idAccelTable = 0;
   helpinit.idActionBar = 0;
   helpinit.pszHelpWindowTitle = "Help for DDF Sample\0";
   helpinit.fShowPanelId = CMIC_HIDE_PANEL_ID;
   helpinit.pszHelpLibraryName = "DDF.HLP";

   hwndHelpInstance = WinCreateHelpInstance( hab, &helpinit );
   if (!hwndHelpInstance)
      WinMessageBox( HWND_DESKTOP, HWND_DESKTOP, "Help could not be initialized",
                    "DDF Sample", 0, MB_OK | MB_ERROR);
   return;
}