public static IEnumerable<string> QueryDosDevice(string deviceName)
{
if (deviceName != null) deviceName = Paths.RemoveTrailingSeparators(deviceName);
// Null will return everything defined- this list is quite large so set a higher initial allocation
using (NativeBuffer buffer = new NativeBuffer(deviceName == null ? (uint)8192 : 256))
{
uint result = 0;
// QueryDosDevicePrivate takes the buffer count in TCHARs, which is 2 bytes for Unicode (WCHAR)
while ((result = QueryDosDevicePrivate(deviceName, buffer, buffer.Size / 2)) == 0)
{
int lastError = Marshal.GetLastWin32Error();
switch (lastError)
{
case WinError.ERROR_INSUFFICIENT_BUFFER:
buffer.Resize(buffer.Size * 2);
break;
default:
throw GetIoExceptionForError(lastError, deviceName);
}
}
return Strings.Split(buffer, (int)result - 2, '\0');
}
}
internal static IEnumerable<string> GetLogicalDriveStrings()
{
using (NativeBuffer buffer = new NativeBuffer())
{
uint result = 0;
// GetLogicalDriveStringsPrivate takes the buffer count in TCHARs, which is 2 bytes for Unicode (WCHAR)
while ((result = GetLogicalDriveStringsPrivate((uint)buffer.Size / 2, buffer)) > buffer.Size / 2)
{
buffer.Resize(result * 2);
}
if (result == 0)
{
int lastError = Marshal.GetLastWin32Error();
throw GetIoExceptionForError(lastError);
}
return Strings.Split(buffer, (int)result - 1, '\0');
}
}
internal static IEnumerable<string> GetVolumePathNamesForVolumeName(string volumeName)
{
using (NativeBuffer buffer = new NativeBuffer())
{
uint returnLength = 0;
// GetLogicalDriveStringsPrivate takes the buffer count in TCHARs, which is 2 bytes for Unicode (WCHAR)
while (!GetVolumePathNamesForVolumeNamePrivate(volumeName, buffer, (uint)buffer.Size / 2, ref returnLength))
{
int lastError = Marshal.GetLastWin32Error();
switch (lastError)
{
case WinError.ERROR_MORE_DATA:
buffer.Resize(returnLength * 2);
break;
default:
throw GetIoExceptionForError(lastError, volumeName);
}
}
return Strings.Split(buffer, (int)returnLength - 2, '\0');
}
}
