CODEWITHSUNDEEP
winapi
sourcenouveau
sourcenouveau

Reputation: 30534

What does the _LH suffix mean in the Windows API?

In the Windows API there is a structure called IP_ADAPTER_ADDRESSES_LH.

What does the _LH suffix indicate?

Upvotes: 0

Views: 202

Answers (2)

Remy Lebeau
Remy Lebeau

Reputation: 597166

Per the IP_ADAPTER_ADDRESSES documentation:

The size of the IP_ADAPTER_ADDRESSES structure changed on Windows XP with SP1 and later. The size of the IP_ADAPTER_ADDRESSES structure also changed on Windows Vista and later. The size of the IP_ADAPTER_ADDRESSES structure also changed on Windows Vista with SP1 and later and on Windows Server 2008 and later. The Length member should be used to determine which version of the IP_ADAPTER_ADDRESSES structure is being used.

...

In the Windows SDK, the version of the structure for use on Windows Vista and later is defined as IP_ADAPTER_ADDRESSES_LH. In the Microsoft Windows Software Development Kit (SDK), the version of this structure to be used on earlier systems including Windows XP with SP1 and later is defined as IP_ADAPTER_ADDRESSES_XP. When compiling an application if the target platform is Windows Vista and later (NTDDI_VERSION >= NTDDI_LONGHORN, _WIN32_WINNT >= 0x0600, or WINVER >= 0x0600), the IP_ADAPTER_ADDRESSES_LH structure is typedefed to the IP_ADAPTER_ADDRESSES structure. When compiling an application if the target platform is not Windows Vista and later, the IP_ADAPTER_ADDRESSES_XP structure is typedefed to the IP_ADAPTER_ADDRESSES structure.

Upvotes: 1

sourcenouveau
sourcenouveau

Reputation: 30534

The _LH suffix indicates that the API is valid for Windows Vista or later. LH is short for "Longhorn", which was the code name for Windows Vista.

You may see other suffixes such as:

  • _W2K: Windows 2000
  • _W2KSP1: Windows 2000 SP1
  • _XP: Windows XP or later

Upvotes: 3

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