SnmpDuplicateVbl function (winsnmp.h)

Article
10/13/2021

[SNMP is available for use in the operating systems specified in the Requirements section. It may be altered or unavailable in subsequent versions. Instead, use Windows Remote Management, which is the Microsoft implementation of WS-Man.]

The WinSNMP SnmpDuplicateVbl function copies a variable bindings list for the specified WinSNMP session. This function returns a handle to the copied variable bindings list and allocates any necessary memory for it.

Syntax

HSNMP_VBL SNMPAPI_CALL SnmpDuplicateVbl(
  [in] HSNMP_SESSION session,
  [in] HSNMP_VBL     vbl
);

Parameters

[in] session

Handle to the WinSNMP session.

[in] vbl

Handle to the variable bindings list to copy. The source variable bindings list can be empty.

Return value

If the function succeeds, the return value is a handle to a new variable bindings list.

If the function fails, the return value is SNMPAPI_FAILURE. To get extended error information, call SnmpGetLastError. The SnmpGetLastError function can return one of the following errors.

Return code	Description
SNMPAPI_NOT_INITIALIZED	The SnmpStartup function did not complete successfully.
SNMPAPI_ALLOC_ERROR	An error occurred during memory allocation.
SNMPAPI_SESSION_INVALID	The session handle is invalid.
SNMPAPI_VBL_INVALID	The vbl parameter is invalid.
SNMPAPI_OTHER_ERROR	An unknown or undefined error occurred.

Remarks

The SnmpDuplicateVbl function creates a new variable bindings list for the specified WinSNMP session. This function initializes the new list with a copy of the data in the source variable bindings list.

The handle the SnmpDuplicateVbl function returns is unique among the variable bindings list handles that are active within the WinSNMP application.

The WinSNMP application must release the resources associated with each variable bindings list. It should do this by matching each call to the SnmpCreateVbl and SnmpDuplicateVbl functions with a corresponding call to the SnmpFreeVbl function. To avoid memory leaks, a WinSNMP application must call SnmpFreeVbl before it reuses the handle to a variable bindings list in a subsequent call to SnmpCreateVbl or SnmpDuplicateVbl. For additional information, see WinSNMP Data Management Concepts.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	winsnmp.h
Library	Wsnmp32.lib
DLL	Wsnmp32.dll