public static void Close()
{
if (driver != null)
{
uint refCount = 0;
driver.DeviceIOControl(IOCTL_OLS_GET_REFCOUNT, null, ref refCount);
driver.Close();
if (refCount <= 1)
{
driver.Delete();
}
driver = null;
}
if (isaBusMutex != null)
{
isaBusMutex.Close();
isaBusMutex = null;
}
// try to delete temporary driver file again if failed during open
if (fileName != null && File.Exists(fileName))
{
try
{
File.Delete(fileName);
fileName = null;
}
catch (IOException)
{
}
}
public static void Open()
{
// no implementation for unix systems
if (IsOpen || OperatingSystem.IsLinux)
{
return;
}
if (driver != null)
{
return;
}
// clear the current report
report.Length = 0;
driver = new KernelDriver("WinRing0_1_2_0");
driver.Open();
if (!driver.IsOpen)
{
// driver is not loaded, try to install and open
fileName = GetTempFileName();
if (fileName != null && ExtractDriver(fileName))
{
string installError;
if (driver.Install(fileName, out installError))
{
driver.Open();
if (!driver.IsOpen)
{
driver.Delete();
report.AppendLine("Status: Opening driver failed after install");
}
}
else
{
var errorFirstInstall = installError;
// install failed, try to delete and reinstall
driver.Delete();
// wait a short moment to give the OS a chance to remove the driver
Thread.Sleep(2000);
if (driver.Install(fileName, out var errorSecondInstall))
{
driver.Open();
if (!driver.IsOpen)
{
driver.Delete();
report.AppendLine(
"Status: Opening driver failed after reinstall");
}
}
else
{
report.AppendLine("Status: Installing driver \"" +
fileName + "\" failed" +
(File.Exists(fileName) ? " and file exists" : ""));
report.AppendLine("First Exception: " + errorFirstInstall);
report.AppendLine("Second Exception: " + errorSecondInstall);
}
}
}
else
{
report.AppendLine("Status: Extracting driver failed");
}
try
{
// try to delte the driver file
if (File.Exists(fileName))
{
File.Delete(fileName);
}
fileName = null;
}
catch (IOException)
{
}
catch (UnauthorizedAccessException)
{
}
}
if (!driver.IsOpen)
{
driver = null;
}
var mutexName = "Global\\Access_ISABUS.HTP.Method";
try
{
isaBusMutex = new Mutex(false, mutexName);
}
catch (UnauthorizedAccessException)
{
try
{
isaBusMutex = Mutex.OpenExisting(mutexName);
}
catch
{
}
}
}