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RegFlushKey info  Overview  Group

The RegFlushKey function writes all the attributes of the specified open key into the registry.

LONG RegFlushKey(

    HKEY hKey 

// handle of key to write



Identifies a currently open key or one of the following predefined reserved handle values:

Windows NT only:
Windows 95 only: HKEY_DYN_DATA 

Return Values

If the function succeeds, the return value is ERROR_SUCCESS.

If the function fails, the return value is a nonzero error code defined in WINERROR.H. You can use the FormatMessage function with the FORMAT_MESSAGE_FROM_SYSTEM flag to get a generic description of the error.


It is not necessary to call RegFlushKey to change a key. Registry changes are flushed to disk by the registry using its lazy flusher. Registry changes are also flushed to disk at system shutdown.

Unlike RegCloseKey, the RegFlushKey function returns only when all the data has been written to the registry.

The RegFlushKey function may also write out parts of or all of the other keys. Calling this function excessively can have a negative effect on an application’s performance.

An application should only call RegFlushKey if it requires absolute certainty that registry changes are on disk. In general, RegFlushKey rarely, if ever, need be used.

See Also

RegCloseKey, RegDeleteKey

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