/// <summary>
/// 发送控制命令
/// </summary>
/// <param name="cmd">USB_CMD命令</param>
/// <param name="length">欲发送数据长度</param>
/// <param name="data">命令附加参数,即如:{x, y, width, height}</param>
public void sendCommand(USB_CMD cmd, ushort length, byte[] data)
{
USB_CMD_BUF buf = new USB_CMD_BUF();
buf.head = CMD_BUF_HEAD;
buf.end = CMD_BUF_END;
buf.cmd = (byte)cmd;
buf.length = length;
buf.data = data;
int a;
ErrorCode ec = writer.Transfer(getBytes(buf), 0, 9, MAX_TIMEOUT, out a);
//if (ec != ErrorCode.None) throw new Exception(UsbDevice.LastErrorString);
}
/// <summary>
/// 将 USB_CMD_BUF 转换成 byte数组
/// </summary>
/// <param name="buf">USB_CMD_BUF对象</param>
/// <returns>byte数组</returns>
private byte[] getBytes(USB_CMD_BUF buf)
{
int size = Marshal.SizeOf(buf);
byte[] arr = new byte[size];
IntPtr ptr = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(buf, ptr, true);
Marshal.Copy(ptr, arr, 0, size);
Marshal.FreeHGlobal(ptr);
return(arr);
}
