RtmBlockMethods function (rtmv2.h)

The RtmBlockMethods function blocks or unblocks the execution of methods for a specified destination, route, or next hop, or for all destinations, routes, and next hops.

Syntax

DWORD RtmBlockMethods(
  [in] RTM_ENTITY_HANDLE RtmRegHandle,
  [in] HANDLE            TargetHandle,
  [in] UCHAR             TargetType,
  [in] DWORD             BlockingFlag
);

Parameters

[in] RtmRegHandle

Handle to the client obtained from a previous call to RtmRegisterEntity.

[in] TargetHandle

Handle to a destination, route, or next hop for which to block methods. This parameter is optional and can be set to NULL to block methods for all targets.

[in] TargetType

Specifies the type of the handle in TargetHandle. This parameter is optional and can be set to NULL to block methods for all targets. The following flags are used.

Type	Meaning
DEST_TYPE	TargetHandle is a destination.
NEXTHOP_TYPE	TargetHandle is a next hop.
ROUTE_TYPE	TargetHandle is a route.

[in] BlockingFlag

Specifies whether to block or unblock methods. The following flags are used.

Constant	Meaning
RTM_BLOCK_METHODS	Block methods for the specified target.
RTM_RESUME_METHODS	Unblock methods for the specified target.

Return value

If the function succeeds, the return value is NO_ERROR.

If the function fails, the return value is the following error code.

Value	Meaning
ERROR_INVALID_HANDLE	The handle is invalid.

 

 

Remarks

Currently, this function does not support blocking methods for a specific destination, route, or next hop.

Methods are typically blocked when client-specific data in the route is being changed; a client blocks methods, rearranges data, and then unblocks methods.

Clients should only block methods for a short period of time. If a second client calls RtmInvokeMethod and the first client's methods are blocked, RtmInvokeMethod does not return until methods are unblocked and the function call is completed.

Requirements

Requirement	Value
Minimum supported client	None supported
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	rtmv2.h
Library	Rtm.lib
DLL	Rtm.dll

See also

RtmGetEntityMethods

RtmInvokeMethod