WriteableBitmap或BitmapImage到C ++ \ CLI中的StorageFile [英] WriteableBitmap or BitmapImage to StorageFile in C++\CLI

问题描述

任何想法如何将WriteableBitmap或BitmapImage保存到存储文件或使它们成为Stream以便我可以保存图像？

图像只能以那些格式找到它不是文件只是一个BitmapImage。



我在c＃中知道这种方式如何用C ++编写它？

Any ideas how to save a WriteableBitmap or BitmapImage to a Storagefile or make them into Stream so i can save the image?
The image can be found only in those format its not a file its just a BitmapImage.

I know this way in c# any ideas how to make it in C++?

private static async Task<StorageFile> SaveAsJpeg(WriteableBitmap wb)
{
     byte[] pixels;
     using (var stream = wb.PixelBuffer.AsStream())
     {
        pixels = new byte[(uint)stream.Length];
        await stream.ReadAsync(pixels, 0, pixels.Length);
     }
     var name = String.Format("{0}_{1:yyyy-MM-dd_HH-mm-ss}.jpg", "MyApp", DateTime.Now);
     var outputFile = await KnownFolders.PicturesLibrary.CreateFileAsync(name, CreationCollisionOption.ReplaceExisting);
     using (var writeStream = await outputFile.OpenAsync(FileAccessMode.ReadWrite))
     {
        var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, writeStream);
        encoder.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Premultiplied,
                             (uint)wb.PixelWidth, (uint)wb.PixelHeight,
                             96, 96, pixels);
        await encoder.FlushAsync();

        using (var outputStream = writeStream.GetOutputStreamAt(0))
        {
           await outputStream.FlushAsync();
        }
     }
     return outputFile;
}

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