private void initInfo()
{
if (ready)
{
return;
}
var root = RootPathName;
var nameBufferSize = (WinApiFS.MAX_PATH + 1) * Marshal.SystemDefaultCharSize;
var nameCharsCount = WinApiFS.MAX_PATH + 1;
var ptVolumeNameBuffer = Marshal.AllocHGlobal(nameBufferSize);
var ptVolumeSerialNumber = Marshal.AllocHGlobal(4);
var ptMaximumComponentLength = Marshal.AllocHGlobal(4);
var ptFileSystemFlags = Marshal.AllocHGlobal(4);
var ptFileSystemName = Marshal.AllocHGlobal(nameBufferSize);
try
{
var res = WinApiFS.GetVolumeInformation
(root,
ptVolumeNameBuffer,
nameCharsCount,
ptVolumeSerialNumber,
ptMaximumComponentLength,
ptFileSystemFlags,
ptFileSystemName,
nameCharsCount);
if (res == 0) //not process 'device not ready (21)', 'network drive not found (53) 'path not found (3)'
{
var errCode = Marshal.GetLastWin32Error();
if (errCode == 21)
{
DeviceReady = false;
ready = true;
}
else if (errCode == 53)
{
DeviceReady = false;
ready = true;
}
else if (errCode == 3)
{
DeviceReady = false;
ready = true;
}
else
{
Messages.ShowException
(new Win32Exception(errCode),
string.Format
("Failed get volume {0} properties.",
root));
DeviceReady = false;
ready = true;
}
}
else
{
DeviceReady = true;
RootPathName = root;
VolumeName = Marshal.PtrToStringAuto(ptVolumeNameBuffer);
MaximumComponentLength = Marshal.ReadInt32(ptMaximumComponentLength);
FileSystemFlags = (VolumeCaps)Marshal.ReadInt32(ptFileSystemFlags);
FileSystemName = Marshal.PtrToStringAuto(ptFileSystemName);
var serialBytes = new byte[4];
Marshal.Copy(ptVolumeSerialNumber, serialBytes, 0, 4);
SerialNumber = (uint)BitConverter.ToUInt64(serialBytes, 0);
}
if (DeviceReady)
{
VolumeSpaceInfo = VolumeSpaceInfo.GetInfo(RootPathName);
}
else
{
VolumeSpaceInfo = new VolumeSpaceInfo();
}
DriveType = WinApiFS.GetDriveType(RootPathName);
}
finally
{
Marshal.FreeHGlobal(ptFileSystemFlags);
Marshal.FreeHGlobal(ptFileSystemName);
Marshal.FreeHGlobal(ptMaximumComponentLength);
Marshal.FreeHGlobal(ptVolumeNameBuffer);
Marshal.FreeHGlobal(ptVolumeSerialNumber);
ready = true;
}
}