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public PORT_INFO_2[] GetInstalledPorts()
{
int pcbNeeded = 0;
int pcReturned = 0;
if (EnumPorts(null, 2, IntPtr.Zero, 0, ref pcbNeeded, ref pcReturned))
{
//succeeds, but must not, because buffer is zero (too small)!
throw new Exception("EnumPorts should fail!");
}
int lastWin32Error = Marshal.GetLastWin32Error();
//ERROR_INSUFFICIENT_BUFFER = 122 expected, if not -> Exception
if (lastWin32Error != 122)
{
throw new Win32Exception(lastWin32Error);
}
for (int i = 0; i < pcReturned; i++)
{
pinfo[i] = (PORT_INFO_2)Marshal.PtrToStructure(currentPort, typeof(PORT_INFO_2));
currentPort = (IntPtr) (currentPort.ToInt32() + Marshal.SizeOf(typeof (PORT_INFO_2)));
}
Marshal.FreeHGlobal(pPorts);
return pinfo;
}
throw new Win32Exception(Marshal.GetLastWin32Error());
}
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