private void FormMain_Load(object sender, EventArgs e)
{
// start the encryption thread pool to speed up the analyzer - this is also the first access to the native
// "TrueCrypt.dll" and therefore an exception may occur when the library cannot be loaded
try
{
TrueCrypt.EncryptionThreadPoolStart(Environment.ProcessorCount);
}
catch (DllNotFoundException)
{
MessageBox.Show(this, "Unable to load DLL \"TrueCrypt.dll\": This could be caused by a missing Microsoft Visual C++ 2010 Redistributable Package (x86).", Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Stop);
silentExit = true;
Close();
}
// inform the user that some 64-bit operating systems are not supported due to driver signing
string errMessage;
SafeFileHandle hDriver = TrueCrypt.OpenDriver(out errMessage);
if (null != errMessage)
{
errMessage += " Mounting a volume will not work.";
if (Wow.Is64BitOperatingSystem && Wow.IsOSAtLeast(Wow.OSVersion.WIN_VISTA))
{
errMessage += " A 64-bit operating system which requires signed drivers (Windows® Vista or newer) has been detected. Use the F8 boot option and select \"Disable Driver Signature Enforcement\" to temporarily allow the TestCrypt driver to be loaded.";
}
MessageBox.Show(this, errMessage, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
/// <summary>
/// Broadcasts a device change notification to inform the operating system about a device arrival/removal.
/// </summary>
/// <param name="message"></param>
/// <param name="nDosDriveNo"></param>
/// <param name="driveMap"></param>
private static void BroadcastDeviceChange(uint message, int nDosDriveNo, uint driveMap)
{
uint eventId = 0;
if (message == DBT_DEVICEARRIVAL)
{
eventId = SHCNE_DRIVEADD;
}
else if (message == DBT_DEVICEREMOVECOMPLETE)
{
eventId = SHCNE_DRIVEREMOVED;
}
else if (Wow.IsOSAtLeast(Wow.OSVersion.WIN_7) && message == DBT_DEVICEREMOVEPENDING) // Explorer on Windows 7 holds open handles of all drives when 'Computer' is expanded in navigation pane. SHCNE_DRIVEREMOVED must be used as DBT_DEVICEREMOVEPENDING is ignored.
{
eventId = SHCNE_DRIVEREMOVED;
}
if (driveMap == 0)
{
driveMap = (1U << nDosDriveNo);
}
if (eventId != 0)
{
for (int i = 0; i < 26; i++)
{
if (0 != (driveMap & (1U << i)))
{
IntPtr root = Marshal.StringToHGlobalAnsi(string.Format("{0}:\\", Char.ToString((char)('A' + i))));
SHChangeNotify(eventId, SHCNF_PATHA, root, IntPtr.Zero);
Marshal.FreeHGlobal(root);
}
}
}
DEV_BROADCAST_VOLUME dbv = new DEV_BROADCAST_VOLUME();
dbv.dbcv_size = (uint)Marshal.SizeOf(typeof(DEV_BROADCAST_VOLUME));
dbv.dbcv_devicetype = DBT_DEVTYP_VOLUME;
dbv.dbcv_reserved = 0;
dbv.dbcv_unitmask = driveMap;
dbv.dbcv_flags = 0;
uint timeOut = 1000;
// SHChangeNotify() works on Vista, so the Explorer does not require WM_DEVICECHANGE
if (System.Environment.OSVersion.Version.Major >= 6)
{
timeOut = 100;
}
uint dwResult;
IntPtr dbvPtr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(DEV_BROADCAST_VOLUME)));
Marshal.StructureToPtr(dbv, dbvPtr, true);
SendMessageTimeout((IntPtr)HWND_BROADCAST, WM_DEVICECHANGE, message, dbvPtr, SMTO_ABORTIFHUNG, timeOut, out dwResult);
// Explorer prior Vista sometimes fails to register a new drive
if (System.Environment.OSVersion.Version.Major < 6 && message == DBT_DEVICEARRIVAL)
{
SendMessageTimeout((IntPtr)HWND_BROADCAST, WM_DEVICECHANGE, message, dbvPtr, SMTO_ABORTIFHUNG, 200, out dwResult);
}
Marshal.FreeHGlobal(dbvPtr);
}