HOWTO: Determine the Operating System Build Number

• Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b, 5.0, 5.0a

SUMMARY

Visual FoxPro's OS() function allows you to determine the major and minor versions of the host operating system. To determine the operating system build number programmatically, you must use the GetVersionEx() application programming interface (API) call.

NOTE: The GetVersionEx() function, when run under Visual FoxPro 3.0 or 3.0b on 16-bit Windows, can return the Win32s version and build numbers.

MORE INFORMATION

Run the following sample program. A message box containing the major and minor version, the text name of the host operating system and the build number displays. Here is the sample code:

Sample Code
-----------

   #DEFINE VER_PLATFORM_WIN32S 0
   #DEFINE VER_PLATFORM_WIN32_WINDOWS 1
   #DEFINE VER_PLATFORM_WIN32_NT 2
   #DEFINE FFFF 65535
   #DEFINE CR CHR(13)

   DECLARE GetVersionEx IN win32api STRING @OSVERSIONINFO
   * The OSVERSIONINFO structure is 148 bytes long.
   m.osversion = long2str(148) + REPLICATE(CHR(0), 144)
   =GetVersionEx(@m.osversion)
   m.major = str2long(SUBSTR(m.osversion, 5, 4))
   m.minor = str2long(SUBSTR(m.osversion, 9, 4))
   m.build = str2long(SUBSTR(m.osversion, 13, 4))
   m.platform = str2long(SUBSTR(m.osversion, 17, 4))

   m.platformname = ""
   DO CASE
   CASE m.platform = VER_PLATFORM_WIN32S
      m.platformname = "Win32s on Windows 3.1"
   CASE m.platform = VER_PLATFORM_WIN32_WINDOWS
      m.platformname = "Win32 on Windows 95"
   CASE m.platform = VER_PLATFORM_WIN32_NT
      m.platformname = "Windows NT"
   ENDCASE

   * Build must be ANDed with FFFFh per Microsoft Knowledge Base
   * Article, Q92395.
   m.build = BITAND(m.build, FFFF)
   =MESSAGEBOX("Major version:" + STR(m.major) + CR + ;
      "Minor version: " + STR(m.minor) + CR + ;
      "Supported platform: " + STR(m.platform) + ;
      " (" + m.platformname + ")" + CR + ;
      "Build number: " + STR(m.build), ;
      0 + 64 + 0, ;
      "GetVersionEx() results")

   * Function long2str - convert 4-byte integer into low-high format
   * Character string.
   FUNCTION long2str
   PARAMETERS m.longval

   PRIVATE i, m.retstr

   m.retstr = ""
   FOR i = 24 TO 0 STEP -8
      m.retstr = CHR(INT(m.longval/(2^i))) + m.retstr
      m.longval = MOD(m.longval, (2^i))
   NEXT
   RETURN m.retstr

   * Function STR2LONG - convert lo-high ascii character representation
   * into 4-byte integer.
   FUNCTION str2long

   PARAMETERS m.longstr

   PRIVATE i, m.retval

   m.retval = 0
   FOR i = 0 TO 24 STEP 8
      m.retval = m.retval + (ASC(m.longstr) * (2^i))
      m.longstr = RIGHT(m.longstr, LEN(m.longstr) - 1)
   NEXT
   RETURN m.retval 

REFERENCES

For additional information about checking system versions, please see the GetVersion() and GetVersionEx() API documentation in the Windows System Information section of the Platform SDK documentation.

Additional query words: GetVersionEx kbnokeyword

Keywords :
Version : WINDOWS:3.0,3.0b,5.0,5.0a
Platform : WINDOWS
Issue type : kbhowto