public List <String> GetInstalledPorts()
{
//Alternative: prnport.vbs,
uint pcbNeeded = 0;
uint 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);
}
IntPtr pPorts = Marshal.AllocHGlobal((int)pcbNeeded);
if (EnumPorts(null, 2, pPorts, pcbNeeded, ref pcbNeeded, ref pcReturned))
{
IntPtr currentPort = pPorts;
PORT_INFO_2[] pinfo = new PORT_INFO_2[pcReturned];
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);
List <String> result = new List <string>();
for (int i = 0; i < pcReturned; i++)
{
result.Add(pinfo[i].pPortName);
}
return(result);
}
throw new Win32Exception(Marshal.GetLastWin32Error());
}
/// <summary>
/// Lista as portas disponíveis no computador, "server" recebe uma string vazia para o
/// servidor local ou nome do servidor remoto
/// </summary>
private static PORT_INFO_2[] GetAvailablePorts(String server)
{
int ret;
int pcbNeeded = 0; int pcReturned = 0; int lastErr = 0; IntPtr TempBuff = IntPtr.Zero;
PORT_INFO_2[] pinfo = null;
ret = EnumPorts(server, 2, TempBuff, 0, ref pcbNeeded, ref pcReturned);
try
{
TempBuff = Marshal.AllocHGlobal(pcbNeeded + 1);
ret = EnumPorts(server, 2, TempBuff, pcbNeeded, ref pcbNeeded, ref pcReturned);
lastErr = Marshal.GetLastWin32Error();
if (ret != 0)
{
IntPtr CurrentPort = TempBuff;
pinfo = new PORT_INFO_2[pcReturned];
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)));
}
CurrentPort = IntPtr.Zero;
}
return(pinfo);
}
finally
{
if (TempBuff != IntPtr.Zero)
{
Marshal.FreeHGlobal(TempBuff);
TempBuff = IntPtr.Zero;
}
}
}
