public SharedMem(int srcChan, int dstChan, string name, long bufferSize)
{
if (name == null || name == "")
{
name = "Unnamed Channel";
}
this.name = name;
this.srcChan = srcChan;
this.dstChan = dstChan;
this.bufferSize = bufferSize;
byte[] dBytes = new byte[name.Length];
ASCIIEncoding enc = new ASCIIEncoding();
shmemID = SharedMemNative.shmemchain_register_node_special(srcChan, dstChan, (int)bufferSize, enc.GetBytes(name));
if (shmemID < 0)
{
throw new NotSupportedException("Failed to register shmem node. Error code #" + SharedMemNative.shmemchain_get_last_error() + " #" + SharedMemNative.shmemchain_get_last_errorcode());
}
/* try to get the real channel ids */
foreach (NodeInfo info in GetNodeInfos())
{
if (info.shmemID == shmemID)
{
this.srcChan = info.srcChan;
this.dstChan = info.dstChan;
}
}
}
public override int Read(byte[] buffer, int offset, int count)
{
int readParam = (int)readMode;
if (SharedMemNative.shmemchain_get_last_error() != -100)
{
Log.AddMessage("Shmem Error: " + SharedMemNative.shmemchain_get_last_error() + " " + SharedMemNative.shmemchain_get_last_errorcode());
}
/* dynamic and time limited modes have the timeout in 100ms steps as parameter */
if (readMode == eReadMode.Dynamic || readMode == eReadMode.TimeLimited || readMode == eReadMode.TimeLimitedNoPartial)
{
readParam |= ((readTimeout + 99) / 100);
}
/* directly read into buffer */
if (offset == 0)
{
return((int)SharedMemNative.shmemchain_read_data(shmemID, buffer, (uint)count, readParam));
}
/* use a temporary buffer for writing at offset */
byte[] tmpBuffer = new byte[count];
int ret = (int)SharedMemNative.shmemchain_read_data(shmemID, tmpBuffer, (uint)count, readParam);
Array.Copy(tmpBuffer, 0, buffer, offset, count);
return(ret);
}
