Prev Next

DdeAccessData info Overview Group

The DdeAccessData function provides access to the data in the specified dynamic data exchange (DDE) object. An application must call the DdeUnaccessData function when it has finished accessing the data in the object.

LPBYTE DdeAccessData(

HDDEDATA hData,	// handle to DDE object
LPDWORD pcbDataSize	// pointer to variable that receives data length
);

Parameters

hData: Identifies the DDE object to access.
pcbDataSize: Points to a variable that receives the size, in bytes, of the DDE object identified by the hData parameter. If this parameter is NULL, no size information is returned.

Return Values

If the function succeeds, the return value is a pointer to the first byte of data in the DDE object.

If the function fails, the return value is NULL.

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_INVALIDPARAMETER
DMLERR_NO_ERROR

Remarks

If the hData parameter has not been passed to a Dynamic Data Exchange Management Library (DDEML) function, an application can use the pointer returned by DdeAccessData for read-write access to the DDE object. If hData has already been passed to a DDEML function, the pointer should be used only for read access to the memory object.