Open Software Solutions

Source: Microsoft Support

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Create a VC++ console-based application that links statically with MFC and execute it on the Windows Server 2000 (or earlier) operating system.

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You get a fatal error message:
The procedure entry point getaddrinfo could not be located in the dynamic link library WS2_32.dll

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The getaddrinfo (http://msdn.microsoft.com/en-us/library/ms738520.aspx) function was added to the Ws2_32.dll on Windows XP and later.

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To execute an application using this function on earlier versions of Windows (Windows 2000, Windows NT, and Windows Me/98/95), then it is mandatary to #include Ws2tcpip.h and also Wspiapi.h. When the Wspiapi.h header file is included, the ‘getaddrinfo’ function is #defined to the ‘WspiapiGetAddrInfo’ inline function in Wspiapi.h. At runtime, the ‘WspiapiGetAddrInfo’ function is implemented in such a way that if the Ws2_32.dll or the Wship6.dll (the file containing getaddrinfo in the IPv6 Technology Preview for Windows 2000) does not include ‘getaddrinfo’, then a version of ‘getaddrinfo’ is implemented inline based on code in the Wspiapi.h header file. This inline code will be used on older Windows platforms that do not natively support the ‘getaddrinfo’ function.

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