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DdeGetLastError info  Overview  Group

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



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:




A request for a synchronous advise transaction has timed out.


The response to the transaction caused the DDE_FBUSY flag to be set.


A request for a synchronous data transaction has timed out.


A DDEML function was called without first calling the DdeInitialize function, or an invalid instance identifier was passed to a DDEML function.


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.


A request for a synchronous execute transaction has timed out.


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.


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.


A memory allocation has failed.


A client’s attempt to establish a conversation has failed.


A transaction has failed.


A request for a synchronous poke transaction has timed out.


An internal call to the PostMessage function has failed.


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.


A server-side transaction was attempted on a conversation terminated by the client, or the server terminated before completing a transaction.


An internal error has occurred in the DDEML.


A request to end an advise transaction has timed out.


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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