DdeGetLastError

The DdeGetLastError function returns the most recent error code set by the failure of a Dynamic Data Exchange Management Library (DDEML) function and resets the error code to DMLERR_NO_ERROR.

UINT DdeGetLastError(

DWORD idInst	// instance identifier
);

Parameters

idInst

Specifies the application instance identifier obtained by a previous call to the DdeInitialize function.

Return Values

If the function succeeds, the return value is the last error code. Following are the possible DDEML error codes:

Value	Meaning
DMLERR_ADVACKTIMEOUT	A request for a synchronous advise transaction has timed out.
DMLERR_BUSY	The response to the transaction caused the DDE_FBUSY flag to be set.
DMLERR_DATAACKTIMEOUT	A request for a synchronous data transaction has timed out.
DMLERR_DLL_NOT_INITIALIZED	A DDEML function was called without first calling the DdeInitialize function, or an invalid instance identifier was passed to a DDEML function.
DMLERR_DLL_USAGE	An application initialized as APPCLASS_MONITOR has attempted to perform a dynamic data exchange (DDE) transaction, or an application initialized as APPCMD_CLIENTONLY has attempted to perform server transactions.
DMLERR_EXECACKTIMEOUT	A request for a synchronous execute transaction has timed out.
DMLERR_INVALIDPARAMETER	A parameter failed to be validated by the DDEML. Some of the possible causes follow:
	The application used a data handle initialized with a different item name handle than was required by the transaction. The application used a data handle that was initialized with a different clipboard data format than was required by the transaction. The application used a client-side conversation handle with a server-side function or vice versa. The application used a freed data handle or string handle. More than one instance of the application used the same object.
DMLERR_LOW_MEMORY	A DDEML application has created a prolonged race condition (in which the server application outruns the client), causing large amounts of memory to be consumed.
DMLERR_MEMORY_ERROR	A memory allocation has failed.
DMLERR_NO_CONV_ESTABLISHED	A client's attempt to establish a conversation has failed.
DMLERR_NOTPROCESSED	A transaction has failed.
DMLERR_POKEACKTIMEOUT	A request for a synchronous poke transaction has timed out.
DMLERR_POSTMSG_FAILED	An internal call to the PostMessage function has failed.
DMLERR_REENTRANCY	An application instance with a synchronous transaction already in progress attempted to initiate another synchronous transaction, or the DdeEnableCallback function was called from within a DDEML callback function.
DMLERR_SERVER_DIED	A server-side transaction was attempted on a conversation terminated by the client, or the server terminated before completing a transaction.
DMLERR_SYS_ERROR	An internal error has occurred in the DDEML.
DMLERR_UNADVACKTIMEOUT	A request to end an advise transaction has timed out.
DMLERR_UNFOUND_QUEUE_ID	An invalid transaction identifier was passed to a DDEML function. Once the application has returned from an XTYP_XACT_COMPLETE callback, the transaction identifier for that callback function is no longer valid.

See Also

DdeEnableCallback, DdeInitialize, PostMessage

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