DdeGetLastError

  UINT DdeGetLastError(idInst)    
  DWORD idInst; /* instance identifier */

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

Parameters

idInst

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

Return Value

The return value is the last error value. Following are the possible DDEML error values:

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 bit 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 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 are as follows:
  The application used a data handle initialized with a different item-name handle than that required by the transaction.
  The application used a data handle that was initialized with a different clipboard data format than that required by the transaction.
  The application used a client-side conversation handle with a server-side function or vise 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 (where the server application outruns the client), causing large amounts of memory to be consumed.
DMLERR_MEMORY_ERROR A memory allocation failed.
DMLERR_NO_CONV_ESTABLISHED A client's attempt to establish a conversation has failed.
DMLERR_NOTPROCESSED A transaction 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 that was 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 is no longer valid.

See Also

DdeInitialize