Question

使用此处的Xamarin.Forms相机示例 - https://github.com/XForms/Xamarin-Forms-Labs-Samples/tree/master/XF.Labs.CameraSample我可以选择或拍照。然后我需要将此图像转换为二进制

所以这是选择图像的代码：

private async Task SelectPicture()
{
    mediaPicker = DependencyService.Get<IMediaPicker>();
    imageSource = null;
        var mediaFile = await mediaPicker.SelectPhotoAsync(new CameraMediaStorageOptions
            {
                DefaultCamera = CameraDevice.Front,
                MaxPixelDimension = 400
            });
        imageSource = ImageSource.FromStream(() => mediaFile.Source);
        img.Source  = imageSource;

}

和拍摄图像的代码非常相似

private async Task TakePicture()
{
    mediaPicker = DependencyService.Get<IMediaPicker>();
    imageSource = null;
        var mediaFile = await mediaPicker.TakePhotoAsync(new CameraMediaStorageOptions
            {
                DefaultCamera = CameraDevice.Front,
                MaxPixelDimension = 400
            });
        imageSource = ImageSource.FromStream(() => mediaFile.Source);
        img.Source  = imageSource;

}

如何从上面获取实际的字符串imagePath，以便我可以在下面调用DependencyService？

    public  byte[] ImageToBinary(string imagePath)
    {

        FileStream fileStream = new FileStream(imagePath, FileMode.Open, FileAccess.Read);
        byte[] buffer = new byte[fileStream.Length];
        fileStream.Read(buffer, 0, (int)fileStream.Length);
        fileStream.Close();
        return buffer;
    }

Answer 1

不应该这样做累了

它内置于MediaFile中，所以答案就是mediaFile.Path.ToString（）;

Answer 2

mediaFile.Path将为您提供实际路径

Xamarin.Forms获取图像路径

2 个答案: