/* DDE window messages */

#ifdef __cplusplus
extern "C" {
#endif

#define WM_DDE_FIRST        0x03E0
#define WM_DDE_INITIATE     (WM_DDE_FIRST)
#define WM_DDE_TERMINATE    (WM_DDE_FIRST+1)
#define WM_DDE_ADVISE       (WM_DDE_FIRST+2)
#define WM_DDE_UNADVISE     (WM_DDE_FIRST+3)
#define WM_DDE_ACK          (WM_DDE_FIRST+4)
#define WM_DDE_DATA         (WM_DDE_FIRST+5)
#define WM_DDE_REQUEST      (WM_DDE_FIRST+6)
#define WM_DDE_POKE         (WM_DDE_FIRST+7)
#define WM_DDE_EXECUTE      (WM_DDE_FIRST+8)
#define WM_DDE_LAST         (WM_DDE_FIRST+8)

/*--------------------------------------------------------------------------*/
/*      DDEACK structure                                                    */
/*                                                                          */
/*  Structure of wStatus (LOWORD(lParam)) in WM_DDE_ACK message             */
/*      sent in response to a WM_DDE_DATA, WM_DDE_REQUEST, WM_DDE_POKE,     */
/*      WM_DDE_ADVISE, or WM_DDE_UNADVISE message.                          */
/*                                                                          */
/*--------------------------------------------------------------------------*/

typedef struct {
	unsigned bAppReturnCode:8,
		reserved:6,
		fBusy:1,
		fAck:1;
} DDEACK;

/*--------------------------------------------------------------------------*/
/*  DDEADVISE structure                                                     */
/*                                                                          */
/*  WM_DDE_ADVISE parameter structure for hOptions (LOWORD(lParam))         */
/*                                                                          */
/*--------------------------------------------------------------------------*/

typedef struct {
	unsigned reserved:14,
		fDeferUpd:1,
		fAckReq:1;
	int  cfFormat;
} DDEADVISE;

/*--------------------------------------------------------------------------*/
/*       DDEDATA structure                                                  */
/*                                                                          */
/*       WM_DDE_DATA parameter structure for hData (LOWORD(lParam)).        */
/*       The actual size of this structure depends on the size of           */
/*       the Value array.                                                   */
/*                                                                          */
/*--------------------------------------------------------------------------*/

typedef struct {
	unsigned unused:12,
		fResponse:1,
		fRelease:1,
		reserved:1,
		fAckReq:1;
	int  cfFormat;
	BYTE     Value[1];
} DDEDATA;

/*-------------------------------------------------------------------------*/
/*  DDEPOKE structure                                                      */
/*                                                                         */
/*  WM_DDE_POKE parameter structure for hData (LOWORD(lParam)).            */
/*       The actual size of this structure depends on the size of          */
/*       the Value array.                                                  */
/*                                                                         */
/*-------------------------------------------------------------------------*/

typedef struct {
	unsigned unused:13, /* Earlier versions of DDE.H incorrectly */
						/* 12 unused bits.						 */
		fRelease:1,
		fReserved:2;
	int  cfFormat;
	BYTE     Value[1];  /* This member was named rgb[1] in previous */
						/* versions of DDE.H						*/

} DDEPOKE;

/*----------------------------------------------------------------------------
The following typedef's were used in previous versions of the Windows SDK.
They are still valid.  The above typedef's define exactly the same structures
as those below.  The above typedef names are recommended, however, as they
are more meaningful.

Note that the DDEPOKE structure typedef'ed in earlier versions of DDE.H did
not correctly define the bit positions.
----------------------------------------------------------------------------*/

typedef struct {
	unsigned unused:13,
		fRelease:1,
		fDeferUpd:1,
		fAckReq:1;
	int cfFormat;
} DDELN;

typedef struct {
	unsigned unused:12,
		fAck:1,
		fRelease:1,
		fReserved:1,
		fAckReq:1;
	int cfFormat;
	BYTE rgb[1];
} DDEUP;

#ifdef __cplusplus
}
#endif
