Question

我正在试图弄清楚如何从Windows窗体调用Windows相机UI。

我这样做了它确实编译了：

Public Function ShootPicture() As StorageFile
    Dim captureUI As New CameraCaptureUI
    captureUI.PhotoSettings.Format = CameraCaptureUIPhotoFormat.Jpeg
    captureUI.PhotoSettings.AllowCropping = False
    Dim GetPhotoTask As Task(Of StorageFile) = captureUI.CaptureFileAsync(CameraCaptureUIMode.Photo)
    GetPhotoTask.Wait() ' Blocks current thread until CaptureFileAsync task completes'
    Dim result As StorageFile = GetPhotoTask.Result
    Return result
End Function

但是.capturefileAsync（）上存在'System.InvalidCastException'执行错误：类型'System._ComObject'不能被转换为'System.threading.tasks.task'

有人会对如何解决这个问题有任何想法吗？感谢

如果它可以帮到这里是c＃代码翻译：

public StorageFile ShootPicture()
{
    CameraCaptureUI captureUI = new CameraCaptureUI();
    captureUI.PhotoSettings.Format = CameraCaptureUIPhotoFormat.Jpeg;
    captureUI.PhotoSettings.AllowCropping = false;
    Task<StorageFile> GetPhotoTask = captureUI.CaptureFileAsync(CameraCaptureUIMode.Photo);
    GetPhotoTask.Wait();
    // Blocks current thread until CaptureFileAsync task completes
    StorageFile result = GetPhotoTask.Result;
    return result;
}

Answer 1

CaptureFileAsync返回IAsyncOperation，因此请尝试使用await而不是任务：

Dim result As StorageFile = Await captureUI.CaptureFileAsync(CameraCaptureUIMode.Photo)

使用CaptureFileAsync（）转换问题

1 个答案: