private void AddPort(string portName)
{
PORT_INFO_1 pInfo = new PORT_INFO_1 {
szPortName = portName
};
int nResult = AddPortEx(null, 1, ref pInfo, _portMonitor);
if (nResult == 0)
{
nResult = Marshal.GetLastWin32Error();
if (nResult == 87)
{ // Returned if the port exists - but may be for other circumstances too
// Double check that the port does, in fact, exist
if (PortExists(portName))
{
throw new XPSPrintException(string.Format("Port {0} already exists", portName));
}
}
throw new Win32Exception(nResult);
}
}
/// <summary>
/// Get the list of port
/// </summary>
public static List <string> GetPortList()
{
List <string> alRet = new List <string>();
int pcReturned = 0;
int pcbNeeded = 0;
IntPtr outb = IntPtr.Zero;
EnumPorts(null, 1, outb, 0, out pcbNeeded, out pcReturned);
outb = Marshal.AllocHGlobal(pcbNeeded + 1);
EnumPorts(null, 1, outb, pcbNeeded, out pcbNeeded, out pcReturned);
PORT_INFO_1[] portsArray = new PORT_INFO_1[pcReturned];
IntPtr current = outb;
for (int i = 0; i < pcReturned; i++)
{
portsArray[i] = (PORT_INFO_1)Marshal.PtrToStructure(current, typeof(PORT_INFO_1));
current = (IntPtr)((int)current + Marshal.SizeOf(typeof(PORT_INFO_1)));
alRet.Add(portsArray[i].pName);
}
return(alRet);
}
private string[] GetInstalledPorts()
{
uint pcbNeeded = 0;
uint pcReturned = 0;
if (EnumPorts(null, 1, IntPtr.Zero, 0, ref pcbNeeded, ref pcReturned))
{
//succeeds, but must not, because buffer is zero (too small)!
return(null);
}
int lastWin32Error = Marshal.GetLastWin32Error();
//ERROR_INSUFFICIENT_BUFFER expected, if not -> Exception
if (lastWin32Error != ERROR_INSUFFICIENT_BUFFER)
{
throw new Win32Exception(lastWin32Error);
}
IntPtr pPorts = Marshal.AllocHGlobal((int)pcbNeeded);
if (EnumPorts(null, 1, pPorts, pcbNeeded, ref pcbNeeded, ref pcReturned))
{
IntPtr currentPort = pPorts;
string[] sPorts = new string[pcReturned];
for (int i = 0; i < pcReturned; i++)
{
PORT_INFO_1 pinfo = (PORT_INFO_1)Marshal.PtrToStructure(currentPort, typeof(PORT_INFO_1));
sPorts[i] = pinfo.szPortName;
currentPort = (IntPtr)(currentPort.ToInt32() + Marshal.SizeOf(typeof(PORT_INFO_1)));
}
Marshal.FreeHGlobal(pPorts);
return(sPorts);
}
throw new Win32Exception(Marshal.GetLastWin32Error());
}
public static extern int AddPortEx(string pName, int pLevel, ref PORT_INFO_1 lpBuffer, string pMonitorName);
/// <summary>
/// Get the list of port
/// </summary>
public static List<string> GetPortList()
{
List<string> alRet = new List<string>();
int pcReturned = 0;
int pcbNeeded = 0;
IntPtr outb = IntPtr.Zero;
EnumPorts(null, 1, outb, 0, out pcbNeeded, out pcReturned);
outb = Marshal.AllocHGlobal(pcbNeeded + 1);
EnumPorts(null, 1, outb, pcbNeeded, out pcbNeeded, out pcReturned);
PORT_INFO_1[] portsArray = new PORT_INFO_1[pcReturned];
IntPtr current = outb;
for (int i = 0; i < pcReturned; i++)
{
portsArray[i] = (PORT_INFO_1)Marshal.PtrToStructure(current, typeof(PORT_INFO_1));
current = (IntPtr)((int)current + Marshal.SizeOf(typeof(PORT_INFO_1)));
alRet.Add(portsArray[i].pName);
}
return alRet;
}
