我有一个带有异步 OnSurfaceTextureUpdated 方法的活动(使用 ISurfaceTextureListener),在该方法中我调用异步 SendPixel 方法:
public async void OnSurfaceTextureUpdated(SurfaceTexture surface)
{
bool sendPixel = false;
[...]
if (Settings.Pixel.period >= 0)
{
if (stopWatch.ElapsedMilliseconds >= Settings.Pixel.nextSending)
{
if (Settings.Pixel.period > 0)
Settings.Pixel.nextSending += Settings.Pixel.period * ((int)((stopWatch.ElapsedMilliseconds - Settings.Pixel.nextSending) / Settings.Pixel.period) + 1);
sendPixel = true;
}
}
[...]
if (sendPixel)
await SendPixel();
}
这是异步 SendPixel 方法:
async Task SendPixel()
{
try
{
if (Ev3Messaging.IsConnected())
{
Color color = new Color(bm.GetPixel(Settings.Camera.viewport.X_VpToCv(Settings.Pixel.x), Settings.Camera.viewport.X_VpToCv(Settings.Pixel.y)));
Ev3Messaging.AddNumberMessage("MC_Hue", color.GetHue());
Ev3Messaging.AddNumberMessage("MC_Brightness", color.GetBrightness());
Console.WriteLine("SendPixel");
await Ev3Messaging.SendMessages();
Console.WriteLine("SendPixelEnd");
}
}
catch (Exception ex)
{
Console.WriteLine("Error SendPixel: " + ex.Message);
}
}
ISurfaceTextureListener 读取一个视频流,然后多次调用 SendPixel 方法。问题是控制台很好地显示“SendPixel”,但不显示“SendPixelEnd”,并且没有抛出错误。之后,当我关闭活动时,会显示每个丢失的“SendPixelEnd”。
编辑: EV3Messaging.SendMessages 发送在前几行中添加的消息(通过蓝牙):
static List<byte> btMessage = new List<byte>();
static public async Task SendMessages()
{
if (_socket != null)
await _socket.OutputStream.WriteAsync(btMessage.ToArray(), 0, btMessage.Count);
}
为什么会发生这种情况,我该如何解决?
提前致谢。
PS:对不起我的英语不好^^