将 WriteableBitmap 转换为 WP8 上的流 [英] Converting WriteableBitmap to stream on WP8

问题描述

如何将 WriteableBitmap 转换为 WP8 平台上的流?

How can I convert a WriteableBitmap to stream on WP8 platform?

最终目标是使用 SavePictureToCameraRoll(filename, stream)

推荐答案

您可以使用 WritableBitmap.SaveJpeg 方法将位图编码为流，并将此流用作 MediaLibrary.SavePictureToCameraRoll 的参数.
注意:在调用 MediaLibrary.SavePictureToCameraRoll 之前，如果您使用的是 MemoryStream，请不要忘记将流位置设置为 0.像这样:

You can encode your bitmap to stream with WritableBitmap.SaveJpeg method and use this stream as a parameter to MediaLibrary.SavePictureToCameraRoll.
Note: before calling MediaLibrary.SavePictureToCameraRoll don't forget to set the stream position to 0 if you're using a MemoryStream. Like this:

var wb = new WriteableBitmap(bitmap);
var fileStream = new MemoryStream();
wb.SaveJpeg(fileStream, wb.PixelWidth, wb.PixelHeight, 100, 100);
fileStream.Seek(0, SeekOrigin.Begin);

var m = new MediaLibrary();
m.SavePictureToCameraRoll("test", fileStream);

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