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QueryServiceLockStatus info  Overview  Group

The QueryServiceLockStatus function retrieves the lock status of the specified service control manager database.

BOOL QueryServiceLockStatus(

    SC_HANDLE hSCManager,

// handle of svc. ctrl. mgr. database


// address of lock status structure

    DWORD cbBufSize,

// size of service configuration buffer

    LPDWORD pcbBytesNeeded 

// address of variable for bytes needed



Identifies the service control manager database. The OpenSCManager function returns this handle, which must have SC_MANAGER_QUERY_LOCK_STATUS access.
Points to a buffer that receives the QUERY_SERVICE_LOCK_STATUS structure in which the lock status of the specified database is returned, plus the strings to which its members point.
Specifies the size, in bytes, of the buffer pointed to by the lpLockStatus parameter.
Points to a variable that receives the number of bytes needed to return all the lock status information, if the function fails.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.


The following error codes can be set by the service control manager. Other error codes can be set by the registry functions that are called by the service control manager.




The specified handle was not opened with SC_MANAGER_QUERY_LOCK_STATUS access.


There is more lock status information than would fit into the lpLockStatus buffer. The number of bytes required to get all the information is returned in the pcbBytesNeeded parameter. Nothing is written to the lpLockStatus buffer.


The specified handle is invalid.


The QueryServiceLockStatus function returns a QUERY_SERVICE_LOCK_STATUS structure that indicates whether the specified database is locked. If the database is locked, the structure provides the account name of the user that owns the lock and the length of time that the lock has been held.

A process calls the LockServiceDatabase function to acquire ownership of a service control manager database lock and the UnlockServiceDatabase function to release the lock.

See Also

LockServiceDatabase, OpenSCManager, QUERY_SERVICE_LOCK_STATUS, UnlockServiceDatabase 

See also:

file: /Techref/os/win/api/win32/func/src/f69_9.htm, 5KB, , updated: 2000/4/7 12:19, local time: 2022/5/17 01:11,

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