Platform SDK: Interprocess Communications

DdeGetLastError

The DdeGetLastError function retrieves 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
[in] 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, which can be one of the following 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 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.

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.
  Library: Use User32.lib.

See Also

Dynamic Data Exchange Management Library Overview, Dynamic Data Exchange Management Functions, DdeEnableCallback, DdeInitialize, PostMessage