public static void WriteValue(this IntPtr baseAddr, ref int offset, ItemType type, object value)
{
switch (type)
{
case ItemType.Int8:
case ItemType.UInt8:
Marshal.WriteByte(baseAddr, offset, Convert.ToByte(value, CultureInfo.InvariantCulture)); // (byte)value);
break;
case ItemType.Bool:
case ItemType.Int16:
case ItemType.UInt16:
Marshal.WriteInt16(baseAddr, offset, Convert.ToInt16(value, CultureInfo.InvariantCulture)); //(short)value);
break;
case ItemType.UInt32:
case ItemType.Int32:
Marshal.WriteInt32(baseAddr, offset, Convert.ToInt32(value, CultureInfo.InvariantCulture)); //(int)value);
break;
case ItemType.Fix32:
TW_FIX32 f32 = (TW_FIX32)value;
WriteFix32(baseAddr, ref offset, f32);
return; // no need to update offset for this
case ItemType.Frame:
TW_FRAME frame = (TW_FRAME)value;
WriteFix32(baseAddr, ref offset, frame._left);
WriteFix32(baseAddr, ref offset, frame._top);
WriteFix32(baseAddr, ref offset, frame._right);
WriteFix32(baseAddr, ref offset, frame._bottom);
return; // no need to update offset for this
//case ItemType.String1024:
// WriteString(baseAddr, offset, value as string, 1024);
// break;
case ItemType.String128:
WriteString(baseAddr, offset, (string)value, 128);
break;
case ItemType.String255:
WriteString(baseAddr, offset, (string)value, 255);
break;
case ItemType.String32:
WriteString(baseAddr, offset, (string)value, 32);
break;
case ItemType.String64:
WriteString(baseAddr, offset, (string)value, 64);
break;
//case ItemType.Unicode512:
// WriteUString(baseAddr, offset, value as string, 512);
// break;
}
offset += type.GetSize();
}
/// <summary>
/// Generates a <see cref="TW_CAPABILITY"/> using single value (aka TW_ONEVALUE).
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="cap"></param>
/// <param name="type"></param>
/// <param name="value"></param>
/// <returns></returns>
public TW_CAPABILITY Generate <T>(CapabilityId cap, ItemType type, T value)
{
// size of data + uint16 item type
var valueSz = type.GetSize();
if (valueSz < 4)
{
valueSz = 4; // onevalue container value minimum is 32bit
}
var memSz = valueSz + 2; // + item type field
var twCap = new TW_CAPABILITY
{
Capability = cap,
ContainerType = ContainerType.OneValue,
hContainer = config.MemoryManager.Allocate((uint)memSz)
};
if (twCap.hContainer != IntPtr.Zero)
{
IntPtr baseAddr = config.MemoryManager.Lock(twCap.hContainer);
try
{
int offset = 0;
// TODO: type size may be different on mac
baseAddr.WriteValue(ref offset, ItemType.UInt16, value);
// ONEVALUE is special in value can be uint32 or string
// if less than uint32 put it in lower word
// (string value seems undocumented but internet says put it as-is and not a pointer)
if (valueSz < 4)
{
Marshal.WriteInt16(baseAddr, offset, 0);
offset += 2;
}
baseAddr.WriteValue(ref offset, type, value);
}
finally
{
config.MemoryManager.Unlock(twCap.hContainer);
}
}
return(twCap);
}
