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3.1.4.21 GetSystemChangeNumber (Opnum 22)

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The GetSystemChangeNumber method returns the number of changes made to data since the metabase was created.

 HRESULT GetSystemChangeNumber(
   [out] DWORD* pdwSystemChangeNumber
 );

pdwSystemChangeNumber: A pointer to an unsigned 32-bit integer value containing the system change number. This number is increased each time the metabase is updated.

Return Values: A signed 32-bit value that indicates return status. If the method returns a negative value, it failed. If the 12-bit facility code (bits 16–27) is set to 0x007, the value contains a Win32 error code in the lower 16 bits. Zero or positive values indicate success, with the lower 16 bits in positive nonzero values containing warnings or flags defined in the method implementation. For more information about Win32 error codes and HRESULT values, see [MS-ERREF].

Return value/code

Description

0x00000000

S_OK

The call was successful.

The opnum field value for this method is 22.

When processing this call, the server MUST do the following:

  • Return the current system change number in the pdwSystemChangeNumber parameter. The system change number is a 32-bit unsigned integer value that is incremented when a change is made to the metabase. This value SHOULD be persisted between metabase sessions.<16>