如何解决如何在Xamarin.iOS中获取照片的字节[]
我正在Xamarin.iOS中开发摄影软件。 我正在使用PHPhoto类。
拍照时,我正在尝试将其发送到网络上。 我打算以byte []的形式发送它们。 我可以从DidFinishCapture方法中获取照片的数据? 当我开始调试启动时,我看到 PHPhotoLibrary.SharedPhotoLibrary.PerformChanges()会自动将照片保存到照片库中。
如何按字节[]检索照片? 我在PhotoData中找不到它。
我认为LivePhotoCompanionMovieUrl中存在用于保存照片的路径,但这始终为空。
public partial class PhotoCaptureDelegate : AVCapturePhotoCaptureDelegate
{
public override void DidFinishCapture(AVCapturePhotoOutput captureOutput,AVCaptureResolvedPhotoSettings resolvedSettings,NSError error)
{
PHPhotoLibrary.RequestAuthorization(status =>
{
if (status == PHAuthorizationStatus.Authorized)
{
PHPhotoLibrary.SharedPhotoLibrary.PerformChanges(() =>
{
var creationRequest = PHAssetCreationRequest.CreationRequestForAsset();
creationRequest.AddResource(PHAssetResourceType.Photo,PhotoData,null);
var url = LivePhotoCompanionMovieUrl;
if (url != null)
{
var livePhotoCompanionMovieFileResourceOptions = new PAssetResourceCreationoptions
{
ShouldMoveFile = true
};
creationRequest.AddResource(PHAssetResourceType.PairedVideo,url,livePhotoCompanionMovieFileResourceOptions);
}
},(success,err) =>
{
if (err != null)
Debug.WriteLine($"Error occurered while saving photo to photo library: {error.LocalizedDescription}");
});
}
});
}
}
}
解决方法
如果要将照片转换为字节数组,可以使用Nuget的插件 Media.Plugin 来拍照。
await CrossMedia.Current.Initialize();
if (!CrossMedia.Current.IsCameraAvailable || !CrossMedia.Current.IsTakePhotoSupported)
{
DisplayAlert("No Camera",":( No camera available.","OK");
return;
}
var file = await CrossMedia.Current.TakePhotoAsync(new Plugin.Media.Abstractions.StoreCameraMediaOptions
{
SaveToAlbum = true,Name = "test.jpg"
});
if (file == null)
return;
然后先将其转换为 Stream ,然后再将其转换为字节数组。
Stream stream = file.GetStream();
public byte[] GetImageStreamAsBytes(Stream input)
{
var buffer = new byte[16*1024];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = input.Read(buffer,buffer.Length)) > 0)
{
ms.Write(buffer,read);
}
return ms.ToArray();
}
}
现在您可以像下面这样获取字节数组
var imgDate = GetImageStreamAsBytes(stream);
更新
您可以使用UIImagePickerController
UIImagePickerController imagePicker;
并在需要拍照时调用以下行
imagePicker = new UIImagePickerController
{
SourceType = UIImagePickerControllerSourceType.Camera,MediaTypes = UIImagePickerController.AvailableMediaTypes(UIImagePickerControllerSourceType.Camera)
};
// Set event handlers
imagePicker.FinishedPickingMedia += ImagePicker_FinishedPickingMedia; ;
imagePicker.Canceled += ImagePicker_Canceled; ;
// Present UIImagePickerController;
this.PresentViewController(imagePicker,true,null);
private void ImagePicker_Canceled(object sender,EventArgs e)
{
imagePicker.DismissModalViewController(true);
}
private void ImagePicker_FinishedPickingMedia(object sender,UIImagePickerMediaPickedEventArgs args)
{
UIImage image = args.EditedImage ?? args.OriginalImage;
if (image != null)
{
// Convert UIImage to .NET Stream object
NSData data;
if (args.ReferenceUrl.PathExtension.Equals("PNG") || args.ReferenceUrl.PathExtension.Equals("png"))
{
data = image.AsPNG();
}
else
{
data = image.AsJPEG(1);
}
Stream stream = data.AsStream();
}
else
{
}
imagePicker.DismissModalViewController(true);
}
public byte[] GetImageStreamAsBytes(Stream input)
{
var buffer = new byte[16*1024];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = input.Read(buffer,read);
}
return ms.ToArray();
}
}
现在您可以像下面这样获取字节数组
var imgDate = GetImageStreamAsBytes(stream);
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