public Context(Dictionary <IntPtr, IntPtr> properties, DeviceType deviceType, Action <string, byte[], object> notify, object user_data)
: this()
{
unsafe
{
int property_count = properties == null ? 0 : properties.Count;
IntPtr *properties_ptr = stackalloc IntPtr[property_count * 2 + 1];
int index = 0;
if (properties != null)
{
foreach (var pair in properties)
{
properties_ptr[index++] = pair.Key;
properties_ptr[index++] = pair.Value;
}
properties_ptr[index] = IntPtr.Zero;
}
else
{
properties_ptr = null;
}
var function_ptr = IntPtr.Zero;
var data_handle = new GCHandle();
var data_ptr = IntPtr.Zero;
if (notify != null)
{
var data = Tuple.Create(notify, user_data);
data_handle = GCHandle.Alloc(data);
data_ptr = GCHandle.ToIntPtr(data_handle);
function_ptr = Marshal.GetFunctionPointerForDelegate(new Action <IntPtr, IntPtr, UIntPtr, IntPtr>(Callback));
}
try
{
int errcode = 0;
Handle = Cl.CreateContextFromType(properties_ptr, (int)deviceType,
function_ptr, data_ptr.ToPointer(), &errcode);
ClHelper.GetError(errcode);
CallbackPointers.Add(Handle, data_handle);
}
catch (Exception)
{
if (data_handle.IsAllocated)
{
data_handle.Free();
}
throw;
}
}
}