public static IAsyncDvcChannel Open(string channelName, WTS_CHANNEL_OPTION option = WTS_CHANNEL_OPTION.DYNAMIC)
{
ValidateChannelName(channelName);
DvcServerChannel result = null;
// Open sfh in a CER since it can't be in a dispose block since lifetime is transferred to DynamicVirtualServerChannel
RuntimeHelpers.PrepareConstrainedRegions();
try { /* CER */ }
finally
{
SafeFileHandle pFile = null;
var sfh = WTSVirtualChannelOpenEx(WTS_CURRENT_SESSION, channelName, option);
try
{
WtsAllocSafeHandle pBuffer = null;
try
{
int cbReturned;
if (!WTSVirtualChannelQuery(sfh, WTS_VIRTUAL_CLASS.FileHandle, out pBuffer, out cbReturned) ||
cbReturned < IntPtr.Size)
{
throw new Win32Exception();
}
pFile = new SafeFileHandle(Marshal.ReadIntPtr(pBuffer.DangerousGetHandle()), false);
}
finally
{
pBuffer?.Dispose();
}
if (pFile.IsInvalid)
{
throw new InvalidOperationException("WTSVirtualChannelQuery WTS_VIRTUAL_CLASS.FileHandle returned invalid handle");
}
// create
result = new DvcServerChannel(sfh, new FileStream(pFile, FileAccess.ReadWrite, bufferSize: 32 * 1024 * 1024, isAsync: true));
}
finally
{
if (result == null)
{
sfh.Dispose();
}
}
}
return(result);
}
public static extern WtsVitrualChannelSafeHandle WTSVirtualChannelOpenEx(
int sessionId,
// channel name is always ASCII
[MarshalAs(UnmanagedType.LPStr)] string channelName,
WTS_CHANNEL_OPTION options);
