Write SF

3270	5250	VT
Yes	No	No

The Write SF function allows a client application to write structured field data to the host application.

Note: The client must call the Set Structured Field Service Condition function before invoking the Write SF function.

The client sends the following message to write structured field data.

PostMessage( hServerWnd,
             WM_DDE_POKE,
             hClientWnd,
             PackDDELParam(WM_DDE_POKE,
             hData, aSF) );

where:

hData

Identifies a handle to a Windows global memory object containing:

typedef struct tagWRITESF
{
  unsigned char  poke[(sizeof(DDEPOKE)-1)];
  unsigned short uSFLength;      /* Length of SF data
  unsigned char  Work[8];        /* Work area
  unsigned char  szSFData[1];    /* SF data
} WRITESF;
 
typedef union tagDDE_WRITESF
{
  DDEPOKE  DDEpoke;
  WRITESF  DDEwritesf;
} DDE_WRITESF, *lpDDE_WRITESF;

aSF

Identifies structured field as the item.