#pragma comment(lib, "User32.lib")
#define BUFSIZE 256
typedef void (WINAPI *PGNSI)(LPSYSTEM_INFO);
typedef BOOL (WINAPI *PGPI)(DWORD, DWORD, DWORD, DWORD, PDWORD);

BOOL GetOSDisplayString( __out LPTSTR pszOS)
{
 OSVERSIONINFOEX osvi;
 SYSTEM_INFO si;
 PGNSI pGNSI;
 PGPI pGPI;
 BOOL bOsVersionInfoEx;
 DWORD dwType;

 ZeroMemory(&si, sizeof(SYSTEM_INFO));
 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));

 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);

 if( !(bOsVersionInfoEx = GetVersionEx ((OSVERSIONINFO *) &osvi)) )
  return 1;

 // Call GetNativeSystemInfo if supported or GetSystemInfo otherwise.

 pGNSI = (PGNSI) GetProcAddress(
  GetModuleHandle(TEXT("kernel32.dll")),
  "GetNativeSystemInfo");
 if(NULL != pGNSI)
  pGNSI(&si);
 else GetSystemInfo(&si);

 if ( VER_PLATFORM_WIN32_NT==osvi.dwPlatformId &&
  osvi.dwMajorVersion > 4 )
 {
  StringCchCopy(pszOS, BUFSIZE, TEXT("Microsoft "));

  // Test for the specific product.

  if ( osvi.dwMajorVersion == 6 )
  {
   if( osvi.dwMinorVersion == 0 )
   {
    if( osvi.wProductType == VER_NT_WORKSTATION )
     StringCchCat(pszOS, BUFSIZE, TEXT("Windows Vista "));
    else StringCchCat(pszOS, BUFSIZE, TEXT("Windows Server 2008 " ));
   }

   if ( osvi.dwMinorVersion == 1 )
   {
    if( osvi.wProductType == VER_NT_WORKSTATION )
     StringCchCat(pszOS, BUFSIZE, TEXT("Windows 7 "));
    else StringCchCat(pszOS, BUFSIZE, TEXT("Windows Server 2008 R2 " ));
   }

   pGPI = (PGPI) GetProcAddress(
    GetModuleHandle(TEXT("kernel32.dll")),
    "GetProductInfo");

   pGPI( osvi.dwMajorVersion, osvi.dwMinorVersion, 0, 0, &dwType);

   switch( dwType )
   {
   case PRODUCT_ULTIMATE:
    StringCchCat(pszOS, BUFSIZE, TEXT("Ultimate Edition" ));
    break;
   case PRODUCT_PROFESSIONAL:
    StringCchCat(pszOS, BUFSIZE, TEXT("Professional" ));
    break;
   case PRODUCT_HOME_PREMIUM:
    StringCchCat(pszOS, BUFSIZE, TEXT("Home Premium Edition" ));
    break;
   case PRODUCT_HOME_BASIC:
    StringCchCat(pszOS, BUFSIZE, TEXT("Home Basic Edition" ));
    break;
   case PRODUCT_ENTERPRISE:
    StringCchCat(pszOS, BUFSIZE, TEXT("Enterprise Edition" ));
    break;
   case PRODUCT_BUSINESS:
    StringCchCat(pszOS, BUFSIZE, TEXT("Business Edition" ));
    break;
   case PRODUCT_STARTER:
    StringCchCat(pszOS, BUFSIZE, TEXT("Starter Edition" ));
    break;
   case PRODUCT_CLUSTER_SERVER:
    StringCchCat(pszOS, BUFSIZE, TEXT("Cluster Server Edition" ));
    break;
   case PRODUCT_DATACENTER_SERVER:
    StringCchCat(pszOS, BUFSIZE, TEXT("Datacenter Edition" ));
    break;
   case PRODUCT_DATACENTER_SERVER_CORE:
    StringCchCat(pszOS, BUFSIZE, TEXT("Datacenter Edition (core installation)" ));
    break;
   case PRODUCT_ENTERPRISE_SERVER:
    StringCchCat(pszOS, BUFSIZE, TEXT("Enterprise Edition" ));
    break;
   case PRODUCT_ENTERPRISE_SERVER_CORE:
    StringCchCat(pszOS, BUFSIZE, TEXT("Enterprise Edition (core installation)" ));
    break;
   case PRODUCT_ENTERPRISE_SERVER_IA64:
    StringCchCat(pszOS, BUFSIZE, TEXT("Enterprise Edition for Itanium-based Systems" ));
    break;
   case PRODUCT_SMALLBUSINESS_SERVER:
    StringCchCat(pszOS, BUFSIZE, TEXT("Small Business Server" ));
    break;
   case PRODUCT_SMALLBUSINESS_SERVER_PREMIUM:
    StringCchCat(pszOS, BUFSIZE, TEXT("Small Business Server Premium Edition" ));
    break;
   case PRODUCT_STANDARD_SERVER:
    StringCchCat(pszOS, BUFSIZE, TEXT("Standard Edition" ));
    break;
   case PRODUCT_STANDARD_SERVER_CORE:
    StringCchCat(pszOS, BUFSIZE, TEXT("Standard Edition (core installation)" ));
    break;
   case PRODUCT_WEB_SERVER:
    StringCchCat(pszOS, BUFSIZE, TEXT("Web Server Edition" ));
    break;
   }
  }