Question

我有一个项目，其中我仅使用语音命令来执行一些不同的功能，其中之一是使用Hololens拍照。因此，我使用StartCoroutine(photoshoot());函数来调用IEnumerator photoshoot()。 IEnumerator photoshoot()称为TakePhotosnap();。

可以完美拍摄照片，但是拍摄后出现问题，它无法返回到IEnumerator。

它将停止代码，并且无法执行任何其他功能。

您可以在我的代码中看到（我输入了一些数字来帮助我解释功能）

我叫StartCoroutine(photoshoot());第11行，在IEnumerator photoshoot()叫TakePhotosnap();第12行，它执行拍照直到第13行Debug.Log("we finish taking photo successfully ");，然后停下来。它应该转到IEnumerator photoshoot()中的第14行。

这是我的一些代码

private void Takephoto()

{

// this function is to call to take a photo and save it in a special folder

Debug.Log("Take Photo function call is started");

11 StartCoroutine(photoshoot());

Debug.Log("Take Photo for Hololens");

}

IEnumerator photoshoot()

{

Debug.Log(" The taking photo coroutine is started ");

yield return new WaitForEndOfFrame();

Debug.Log("Take Photo");

12 TakePhotosnap();

14 Debug.Log("Finish taking Hi again ");

yield return new WaitForEndOfFrame();

GameObject.Find("Cube").transform.localPosition = new Vector3(Random.Range(-1, 1), 0, Random.Range(1, 3));

GameObject.Find("Cube").SetActive(true);

}

--------------------------------------------

private void TakePhotosnap()

{

Debug.Log("TakePhoto Call StartPhotoModeAsync () method to start the photo mode");

Debug.Log("snap pic taken");

PhotoCapture.CreateAsync(false, OnPhotoCaptureCreated);

}

void OnPhotoCaptureCreated(PhotoCapture captureObject)

{

//Store objects, configure shooting parameters and start shooting mode.

Debug.Log("Start taking photo calling function");

photoCaptureObject = captureObject;

Debug.Log("set camera parameters");

Resolution cameraResolution = PhotoCapture.SupportedResolutions.OrderByDescending((res) => res.width * res.height).First();

CameraParameters c = new CameraParameters();

/// c= CameraParameters

c.hologramOpacity = 1.0f;

c.cameraResolutionWidth = cameraResolution.width;

c.cameraResolutionHeight = cameraResolution.height;

c.pixelFormat = CapturePixelFormat.BGRA32;

Debug.Log("camera parameters finish");

captureObject.StartPhotoModeAsync(c, OnPhotoModeStarted);

}

private void OnPhotoModeStarted(PhotoCapture.PhotoCaptureResult result)

{

if (result.success)

{

//string filename = string.Format(@"CapturedImage{0}_n.jpg", Time.time);

string filename = string.Format(@"alc.jpg", Time.time);

Debug.Log("FileName: =" + filename);

string filePath = System.IO.Path.Combine(Application.persistentDataPath, filename);

Debug.Log("filePath: =" + filePath);

/////

string targetPath = @"C: \Users\ABC\Pictures\Camera Roll";

string destFile = System.IO.Path.Combine(targetPath, filename);

Debug.Log("destFile: =" + destFile);

if (!System.IO.File.Exists(filePath))

{

//System.IO.File.Create(filePath);

System.IO.File.Create(filePath).Dispose();

}

// https://blog.csdn.net/Lee_gc/java/article/details/79919042

Debug.Log("filePath filePath: =" + filePath);

string filePath2 = System.IO.Path.Combine(Application.dataPath, filename);

Debug.Log("filePath2: =" + filePath2);

Debug.Log("finish to set photo file path and name");

//photoCaptureObject.TakePhotoAsync(filePath, PhotoCaptureFileOutputFormat.JPG, OnCapturedPhotoToDisk);

Debug.LogError("Saved That Image Somewhere" + "FileName: =" + filename + " FilePath: = " + filePath + " FilePath2: = " + filePath2);

Debug.Log("finish to copy photo to new directory");

Debug.Log("finish photo");

photoCaptureObject.TakePhotoAsync(filePath, PhotoCaptureFileOutputFormat.JPG, OnCapturedPhotoToDisk);

13 Debug.Log("we finish taking photo successfuly ");

}

else

{

Debug.LogError("Unable to start photo mode!");

}

}

// clean up

void OnStoppedPhotoMode(PhotoCapture.PhotoCaptureResult result)

{

Debug.Log("result=" + result);

photoCaptureObject.Dispose();

photoCaptureObject = null;

}

void OnCapturedPhotoToDisk(PhotoCapture.PhotoCaptureResult result)

{

if (result.success)

{

Debug.Log("Saved Photo to disk!");

photoCaptureObject.StopPhotoModeAsync(OnStoppedPhotoMode);

}

else

{

Debug.Log("Failed to save Photo to disk");

}

}

}

我的代码有什么问题？还有其他解决方法吗？

Answer 1

实际上，代码14的运行时间比您想象的要早。在TakePhotosnap函数中，运行异步方法PhotoCapture.CreateAsync()时，该方法将控制权返回给调用方法，然后立即输出“再次完成Hi动作”。另外，由于异步的原因，在TakePhotoAsync方法返回的任何结果之前，将输出代码13，因此不会标记照片已成功拍摄。

因此，我们建议您在代码中添加断点以确定是否执行代码14，然后尝试将log语句移至回调。例如：

photoCaptureObject.TakePhotoAsync(filePath, PhotoCaptureFileOutputFormat.JPG, OnCapturedPhotoToDisk);

Debug.Log("we finish taking photo successfuly ");

=>

photoCaptureObject.TakePhotoAsync(filePath, PhotoCaptureFileOutputFormat.JPG, OnCapturedPhotoToDisk);


void OnCapturedPhotoToDisk(PhotoCapture.PhotoCaptureResult result)

{
    if (result.success)

    {

        Debug.Log("we finish taking photo successfuly ");

    }
}

此外，此文档值得您阅读：Asynchronous programming with async and await

带有语音命令功能的IEnumerator

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