XTYP_ADVDATA

The XTYP_ADVDATA transaction informs the client that the value of the data item has changed. The DDE client callback function, DdeCallback, receives this transaction after establishing an advise loop with a server.

HDDEDATA CALLBACK DdeCallback(
  UINT uType,     // XTYP_ADVDATA
  UINT uFmt,      // clipboard data format
  HCONV hconv,    // handle to the conversation
  HSZ hsz1,       // handle to a string
  HSZ hsz2,       // handle to a string
  HDDEDATA hdata, // handle to a global memory object
  DWORD dwData1,  // transaction-specific data
  DWORD dwData2   // transaction-specific data
);

Parameters

uType

Specifies the transaction type.

uFmt

Specifies the format atom of the data sent from the server.

hconv

Handle to the conversation.

hsz1

Handle to the topic name.

hsz2

Handle to the item name.

hdata

Handle to the data associated with the topic name and item name pair. This parameter is NULL if the client specified the XTYPF_NODATA flag when it requested the advise loop.

dwData1

Not used.

dwData2

Not used.

Return Values

A DDE callback function should return DDE_FACK if it processes this transaction, DDE_FBUSY if it is too busy to process this transaction, or DDE_FNOTPROCESSED if it rejects this transaction.

Remarks

An application must not free the data handle obtained during this transaction. An application must, however, copy the data associated with the data handle if the application must process the data after the callback function returns. An application can use the DdeGetData function to copy the data.

Requirements

  Windows NT/2000: Requires Windows NT 3.1 or later.
  Windows 95/98: Requires Windows 95 or later.
  Header: Declared in Ddeml.h; include Windows.h.

See Also

Dynamic Data Exchange Management Library Overview, Dynamic Data Exchange Management Transactions, DdeClientTransaction, DdeGetData, DdePostAdvise