InitLock restricts access for other UA Applications.
A call of this Method for an element that is already locked will be rejected.
While locked, requests from other Applications to modify the locked element (e.g., writing to Variables, or invoking Methods) should be rejected with Bad_Locked. However, requests to read or navigate will typically work. Servers may choose to implement an exclusive locking where other Applications have no access at all.
The lock is removed when ExitLock is called. It is automatically removed when the MaxInactiveLockTime elapsed (see 7.4).
The signature of this Method is specified below. Table 62 and Table 63 specify the arguments and AddressSpace representation, respectively.
Signature
InitLock(
[in] 0:String Context,
[out] 0:Int32 InitLockStatus);
Table 62 – InitLock Method Arguments
|
Argument |
Description |
|
Context |
A string used to provide context information about the current activity going on in the Client. |
|
InitLockStatus |
0 – OK -1 – E_AlreadyLocked – the element is already locked -2 – E_Invalid – the element cannot be locked |
Table 63 – InitLock Method AddressSpace definition
|
Attribute |
Value |
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|
BrowseName |
InitLock |
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|
References |
NodeClass |
BrowseName |
DataType |
TypeDefinition |
Other |
|
0:HasProperty |
Variable |
InputArguments |
0:Argument[] |
0:PropertyType |
M |
|
0:HasProperty |
Variable |
OutputArguments |
0:Argument[] |
0:PropertyType |
M |
|
Conformance Units |
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|
DI Locking |
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