/// <summary>
/// Initialize the buffer header file with empty values
/// </summary>
private void InitializeHeader()
{
try
{
//create a new buffer header
_header = new NiawaMmfBufferHeader();
SortedList<int, KeyValuePair<string, DateTime>> entries = new SortedList<int, KeyValuePair<string, DateTime>>();
//populate the buffer header with blank values
int ix = 1;
while (ix <= 100)
{
entries.Add(ix, new KeyValuePair<string, DateTime>(string.Empty, new DateTime(1900, 1, 1)));
ix++;
}
_header.Entries = entries;
_header.LatestUpdateDate = new DateTime(1900, 1, 1);
_header.LatestEntryID = 0;
//convert buffer header to bytes
byte[] buffer = _header.ToByteArray();
//locked section
using (new Niawa.Utilities.SingleGlobalInstance(1000, _ipcType + "_header")) //1000ms timeout on global lock
{
int msgLength = buffer.Length;
int msgID = 0;
//open mmf
MemoryMappedFile mmf = MemoryMappedFile.CreateOrOpen(_ipcType + "_header", _bufferLength);
MemoryMappedViewAccessor accessor1Len = mmf.CreateViewAccessor(0, 4);
MemoryMappedViewAccessor accessor2ID = mmf.CreateViewAccessor(8, 4);
MemoryMappedViewAccessor accessor3Data = mmf.CreateViewAccessor(16, msgLength);
//write data
accessor1Len.Write<Int32>(0, ref msgLength);
accessor2ID.Write<Int32>(0, ref msgID);
accessor3Data.WriteArray<byte>(0, buffer, 0, msgLength);
} //end locked section
}
catch (Exception ex)
{
logger.Error("[" + _description + "-M] Exception while initializing buffer header: " + ex.Message, ex);
if (!_ignoreExceptions)
throw ex;
}
}
