将位图图像转换为字节数组(Windows Phone 8) [英] Convert Bitmap Image to byte array (Windows phone 8)

问题描述

我是Windows Phone开发人员的新手.我的小应用程序需要图像(照片库)中的字节数组.我尝试了多种方法进行转换，但效果不佳.

I am new to windows phone dev. My small app need a bytesarray from image (photo gallery). I tried many ways to convert, but it did not work fine.

这是我的代码:

public static byte[] ConvertBitmapImageToByteArray(BitmapImage bitmapImage)
    {
        using (var ms = new MemoryStream())
        {
            var btmMap = new WriteableBitmap(bitmapImage.PixelWidth, bitmapImage.PixelHeight);
            // write an image into the stream
            btmMap.SaveJpeg(ms, bitmapImage.PixelWidth, bitmapImage.PixelHeight, 0, 100);
            return ms.ToArray();
        }
    }

但是后来我将此字节数组保存到照相馆的图像中，我当时是黑色图像！

But then I saved this byte array to image in photogallery, I was be a black image!

public static void SavePicture2Library(byte[] bytes)
    {
        var library = new MediaLibrary();
        var name = "image_special";
        library.SavePicture(name, bytes);
    }

有人可以帮助我吗? 请测试您的代码:(非常感谢！

Could anyone help me? Please test your code :( Thanks so much!

更新已解决！

var wBitmap = new WriteableBitmap(bitmapImage);
            wBitmap.SaveJpeg(stream, wBitmap.PixelWidth, wBitmap.PixelHeight, 0, 100);
            stream.Seek(0, SeekOrigin.Begin);
            data = stream.GetBuffer();

推荐答案

对于发现此问题的任何人，此方法都有效；

To anyone who finds this, this works;

图像到字节；

public static byte[] ImageToBytes(BitmapImage img)
        {
            using (MemoryStream ms = new MemoryStream())
            {
                WriteableBitmap btmMap = new WriteableBitmap(img);
                System.Windows.Media.Imaging.Extensions.SaveJpeg(btmMap, ms, img.PixelWidth, img.PixelHeight, 0, 100);
                img = null;
                return ms.ToArray();
            }
        }

字节为图像

public static BitmapImage BytesToImage(byte[] bytes)
        {
            BitmapImage bitmapImage = new BitmapImage();
            try
            {
                using (MemoryStream ms = new MemoryStream(bytes))
                {
                    bitmapImage.SetSource(ms);
                    return bitmapImage;
                }
            }
            finally { bitmapImage = null; }
        }

这篇关于将位图图像转换为字节数组(Windows Phone 8)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！