Acquires major and minor OS versions, and a platform ID.

bool AIT_GetOSType  (
  integer nMajorVersion,    // Major OS version
  integer nMinorVersion,    // Minor OS version
  integer nPlatformID       // Platform ID
);

nMajorVersion (output)

Specify a variable to receive a major OS version. When the function returns, the variable stores one of the following values.

Value	Description
4	Windows 98
4	Windows Me
4	Windows NT 4.0
5	Windows 2000
5	Windows XP
5	Windows Server 2003
6	Windows Vista
6	Windows Server 2008
6	Windows 7
6	Windows Server 2012
6	Windows 8

nMinorVersion (output)

Specify a variable to receive a minor OS version. When the function returns, the variable stores one of the following values.

Value	Description
10	Windows 98
90	Windows Me
0	Windows NT 4.0
0	Windows 2000
1	Windows XP
2	Windows Server 2003
0	Windows Vista
0	Windows Server 2008
1	Windows Server 2008 R2
1	Windows 7
2	Windows Server 2012
2	Windows 8

nPlatformID (output)

Specify a variable to receive an OS platform ID. When the function returns, the variable stores one of the following values.

Value	Description
VER_PLATFORM_WIN32_WINDOWS	Windows Me or Windows 98
VER_PLATFORM_WIN32_NT	Windows 8, Windows Server 2012, Windows 7, Windows Server 2008, Windows Vista, Windows Server 2003, Windows XP, Windows 2000, or Windows NT 4.0

The return value is true if the function was executed normally, and false if not. If the function has returned false, you can use AIT_GetLastError to acquire an extended error code. The following gives the error code that AIT_GetLastError may return.

Extended error number	Error code
122	ERROR_INSUFFICIENT_BUFFER

You have to use a desired version number or a greater number to identify what OS version the application is working on. This allows you to test even a new OS version in the same way.