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DdePostAdvise info  Overview  Group

The DdePostAdvise function causes the system to send an XTYP_ADVREQ transaction to the calling (server) applicationís dynamic data exchange (DDE) callback function for each client with an active advise loop on the specified topic and item. A server application should call this function whenever the data associated with the topic name or item name pair changes.

BOOL DdePostAdvise(

    DWORD idInst,

// instance identifier

    HSZ hszTopic,

// handle to topic name string

    HSZ hszItem 

// handle to item name string

   );

Parameters

idInst
Specifies the application instance identifier obtained by a previous call to the DdeInitialize function.
hszTopic
Identifies a string that specifies the topic name. To send notifications for all topics with active advise loops, an application can set this parameter to 0L.
hszItem
Identifies a string that specifies the item name. To send notifications for all items with active advise loops, an application can set this parameter to 0L.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero.

Errors

The DdeGetLastError function can be used to get the error code, which may be one of the following values:

DMLERR_DLL_NOT_INITIALIZED
DMLERR_DLL_USAGE
DMLERR_NO_ERROR

Remarks

A server that has nonenumerable topics or items should set the hszTopic and hszItem parameters to NULL so that the system generates transactions for all active advise loops. The serverís DDE callback function returns NULL for any advise loops that must not be updated.

If a server calls DdePostAdvise with a topic, item, and format name set that includes the set currently being handled in an XTYP_ADVREQ callback, a stack overflow may result.

See Also

DdeInitialize, XTYP_ADVREQ

See also:


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