PC/3270 Response

PC/3270 receives the Start Read SF and returns an ACK message if it can start the Read SF. Otherwise a negative ACK message is returned to the client with one of the following return codes in the low-order byte of the wStatus field:

WM_DDE_ACK(wStatus, aSF)

Once the Read SF has started, the client receives DATA messages of the structured field:

WM_DDE_DATA(hData, aSF)

where:

hData

Identifies a handle to a Windows global memory object containing:

typedef struct tagMOUSE_CF_DSPTEXT
{
  unsigned char  data[(sizeof(DDEDATA)-1)];
  unsigned short uPSPos;                  /* PS Offset  - Mouse position
  unsigned short uPSRowPos;               /* ROW number - Mouse position
  unsigned short uPSColPos;               /* Col number - Mouse position
  unsigned short uPSSize;                 /* Size of Presentation Space
  unsigned short uPSRows;                 /* Row number of PS
  unsigned short uPSCols;                 /* Column number of PS
  unsigned short uButtonType;             /* Type of clicked mouse button
  unsigned short uClickType;              /* Type of clicking
  unsigned char  zClickString[1];          /* Retrieved string
} MOUSE_CF_DSPTEXT;
 
typedef union tagDDE_MOUSE_CF_DSPTEXT
{
  DDEDATA           DDEdata;
  MOUSE_CF_DSPTEXT  DDEmouse;
} DDE_MOUSE_CF_DSPTEXT, *lpDDE_MOUSE_CF_DSPTEXT;
typedef struct tagSFDATA
{
  unsigned char  data[(sizeof(DDEDATA)-1)];
  unsigned short uSFLength;                /* Length of SF data
  unsigned char  szSFData[1];               /* SF data
} SFDATA;
 
typedef union tagDDE_SFDATA
{
  DDEDATA  DDEdata;
  SFDATA   DDEsfdata;
} DDE_SFDATA, *lpDDE_SFDATA;