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Posted on 1998-10-26
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Last Modified: 2013-11-20
now i use visual c++ 5. I would like to know how i get information system
 such as ( how many drive in computer , name of computer,...).
i will use that information for my application.
please advise me
thank you
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Question by:eakkung
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stefanr earned 100 total points
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SYSTEM_INFO SystemInfo = { 0 };
::GetSystemInfo(&SystemInfo);

//-------x-------

MEMORYSTATUS MemoryStatus = { 0 };
MemoryStatus.dwLength = sizeof(MEMORYSTATUS);
::GlobalMemoryStatus(&MemoryStatus);

//-------x-------

CString strComputerName;
::GetComputerName(strComputerName.GetBuffer(MAX_COMPUTERNAME_LENGTH+1), MAX_COMPUTERNAME_LENGTH+1);
strComputerName.ReleaseBuffer();

//-------x--------

struct PHYDRIVEINFO
{
   CString m_sDrive;
   DISK_GEOMETRY m_DiskGeometry;
   CByteArray m_arrDriveLayout;

   PHYDRIVEINFO() { ::ZeroMemory(&m_DiskGeometry, sizeof(DISK_GEOMETRY)); }
   PHYDRIVEINFO(PHYDRIVEINFO& obj) { ::ZeroMemory(&m_DiskGeometry, sizeof(DISK_GEOMETRY)); }
   PHYDRIVEINFO& operator=(PHYDRIVEINFO& obj) { return *this; }
   PHYDRIVEINFO& operator=(LPCTSTR lpszDrive) { m_sDrive = lpszDrive; return *this; }
};

CArray<PHYDRIVEINFO, LPCTSTR> arrPhysicalDrives;

const int MAXPHYDRIVE = 16;

const CString sFileNamePrefix = _T("\\\\.\\");
CString sFileName;
CString sFilePath;
HANDLE hFile = INVALID_HANDLE_VALUE;
for (int i = 0; i < MAXPHYDRIVE; i++)
{
   sFileName.Format(_T("PHYSICALDRIVE%d"), i);
   sFilePath = sFileNamePrefix + sFileName;
   hFile = ::CreateFile(sFilePath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
   if (hFile != INVALID_HANDLE_VALUE)
   {
      int nIndex = arrPhysicalDrives.Add(sFileName);
      PHYDRIVEINFO& rPhyDriveInfo = arrPhysicalDrives.ElementAt(nIndex);
      DWORD dwBytesReturned = 0;
      ::DeviceIoControl(hFile, IOCTL_DISK_GET_DRIVE_GEOMETRY, NULL, 0, &rPhyDriveInfo.m_DiskGeometry, sizeof(DISK_GEOMETRY), &dwBytesReturned, NULL);

      int cPartns = 4;
      while (TRUE)
      {
         rPhyDriveInfo.arrDriveLayout.SetSize(sizeof(DRIVE_LAYOUT_INFORMATION) + cPartns*sizeof(PARTITION_INFORMATION));
         ::ZeroMemory(rPhyDriveInfo.arrDriveLayout.GetData(), rPhyDriveInfo.arrDriveLayout.GetSize());
         if (::DeviceIoControl(hFile, IOCTL_DISK_GET_DRIVE_LAYOUT, NULL, 0, rPhyDriveInfo.arrDriveLayout.GetData(), rPhyDriveInfo.arrDriveLayout.GetSize(), &dwBytesReturned, NULL))
            break;
         else if (::GetLastError() != ERROR_INSUFFICIENT_BUFFER)
         {
            rPhyDriveInfo.arrDriveLayout.RemoveAll();
            break;
         }
         cPartns += 4;
      }

      ::CloseHandle(hFile);
   }
}

//-------x--------

struct LOGDRIVEINFO
{
   BOOL m_bInfoValid;
   CString m_sDrive;
   CString m_sVolumeName;
   DWORD m_dwVolumeSerialNumber;
   DWORD m_dwMaxNameLength;
   DWORD m_dwFileSystemFlags;
   CString m_sFileSystemName;
   UINT m_nDriveType;
   unsigned long m_nSectorsPerCluster;
   unsigned long m_nBytesPerSector;
   unsigned long m_nFreeClusters;
   unsigned long m_nClusters;

   LOGDRIVEINFO()
   {
      m_bInfoValid = FALSE;
      m_dwVolumeSerialNumber = 0;
      m_dwMaxNameLength = 0;
      m_dwFileSystemFlags = 0;
      m_nDriveType = 0;
      m_nSectorsPerCluster = 0;
      m_nBytesPerSector = 0;
      m_nFreeClusters = 0;
      m_nClusters = 0;
   }
   LOGDRIVEINFO(LOGDRIVEINFO& obj)
   {
      m_bInfoValid = FALSE;
      m_dwVolumeSerialNumber = 0;
      m_dwMaxNameLength = 0;
      m_dwFileSystemFlags = 0;
      m_nDriveType = 0;
      m_nSectorsPerCluster = 0;
      m_nBytesPerSector = 0;
      m_nFreeClusters = 0;
      m_nClusters = 0;
      operator=(obj);
   }
   LOGDRIVEINFO& operator=(LOGDRIVEINFO& obj) { m_sDrive = obj.m_sDrive; return *this; }
   LOGDRIVEINFO& operator=(LPCTSTR lpszDrive) { m_sDrive = lpszDrive; return *this; }
};

CArray<LOGDRIVEINFO, LPCTSTR> arrLogicalDrives;

const int LOGDRIVEBUFSIZE = 1024;
LPTSTR lpszzLogicalDrives = new TCHAR[LOGDRIVEBUFSIZE];
::ZeroMemory(lpszzLogicalDrives, LOGDRIVEBUFSIZE * sizeof(TCHAR));
::GetLogicalDriveStrings(LOGDRIVEBUFSIZE, lpszzLogicalDrives);

for (LPTSTR lpsz = lpszzLogicalDrives; *lpsz != 0; lpsz += ::_tcslen(lpsz)+1)
{
   TCHAR szLogicalDrive[4] = { 0 };
   ::_tcsnccpy(szLogicalDrive, lpsz, ::_tcslen(lpsz)-1);
   int nIndex = arrLogicalDrives.Add(szLogicalDrive);
   arrLogicalDrives[nIndex].m_bInfoValid = ::GetVolumeInformation(lpsz,
                             arrLogicalDrives[nIndex].m_sVolumeName.GetBuffer(_MAX_PATH), _MAX_PATH,
                             &arrLogicalDrives[nIndex].m_dwVolumeSerialNumber,
                             &arrLogicalDrives[nIndex].m_dwMaxNameLength,
                             &arrLogicalDrives[nIndex].m_dwFileSystemFlags,
                             arrLogicalDrives[nIndex].m_sFileSystemName.GetBuffer(_MAX_PATH), _MAX_PATH);
      arrLogicalDrives[nIndex].m_sVolumeName.ReleaseBuffer();
      arrLogicalDrives[nIndex].m_sFileSystemName.ReleaseBuffer();
   arrLogicalDrives[nIndex].m_nDriveType = ::GetDriveType(lpsz);
   if (arrLogicalDrives[nIndex].m_nDriveType == DRIVE_FIXED || arrLogicalDrives[nIndex].m_nDriveType == DRIVE_CDROM || arrLogicalDrives[nIndex].m_nDriveType == DRIVE_RAMDISK)
   {
      ::GetDiskFreeSpace(lpsz, &arrLogicalDrives[nIndex].m_nSectorsPerCluster, &arrLogicalDrives[nIndex].m_nBytesPerSector,
                                  &arrLogicalDrives[nIndex].m_nFreeClusters, &arrLogicalDrives[nIndex].m_nClusters);
   }
}
delete[] lpszzLogicalDrives;
lpszzLogicalDrives = NULL;

This is taken from an actual application, modified slightly for this informational purpose.

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