WP7串流并返回 [英] WP7 string to stream and back

问题描述

大家好...


我正在Windows Phone 7中工作，我需要将字符串转换为流.

我得到了一个照片流，并已将其转换为字符串as-

hye all...


i m working in Windows Phone 7 and i need to convert a string to a stream.

i got a photo stream to which i have converted into string as-

StreamReader sr = new StreamReader(photoStream);
                string str = sr.ReadToEnd();

现在我想将该字符串转换回流，然后将图像转换为-

now i want to convert that string back to stream and then to image as -

byte[] data = Encoding.UTF8.GetBytes(str);
            MemoryStream memStream = new MemoryStream(data);
            memStream.Seek(data.Length, 0);
            WriteableBitmap bimg = PictureDecoder.DecodeJpeg(memStream);
            image1.Source = bimg;

但随着它的来临

WriteableBitmap bimg = PictureDecoder.DecodeJpeg(memStream);

它给出了异常-参数不正确."

现在我该怎么办...:confused:
请帮忙...
在此先感谢...

but as it come to the line

WriteableBitmap bimg = PictureDecoder.DecodeJpeg(memStream);

it gives the exception - "The parameter is incorrect."

now what should i do...:confused:
please help...
thanks in advance...

推荐答案

如果这是图像数据，则我不会将其转换为字符串:默认转换需要Unicode文本数据，而不是Unicode文本数据二进制文件，并将更改换行符，依此类推.相反，可以考虑使用Stream.GetBuffer将其转换为byte []

If this is image data, then I wouldn''t convert it to a string: the default conversion expects unicode text data rather than binary, and will change newlines and so forth. Instead, consider converting it to a byte[] using Stream.GetBuffer

大家好，

我已将照片流转换为Windows Phone 7(C#.net)中的字符串.

使用的名称空间:
使用System.Windows.Controls；使用System.IO;使用System.Windows.Media.Imaging;
使用System.Windows.Media;

流到字符串:

hye all,

I have converted a photo stream to string as in Windows Phone 7 (C#.net)

namespaces used :
using System.Windows.Controls; using System.IO; using System.Windows.Media.Imaging;
using System.Windows.Media;

Stream to String :

BitmapImage bimg = new BitmapImage();
                bimg.SetSource(photoStream); //photoStream is a stream containing data for a photo
                
                byte[] bytearray = null;
                using (MemoryStream ms = new MemoryStream())
                {
                    WriteableBitmap wbitmp = new WriteableBitmap(bimg);
                    wbimg.SaveJpeg(ms, wbitmp.PixelWidth, wbitmp.PixelHeight, 0, 100);
                    ms.Seek(0, SeekOrigin.Begin);
                    bytearray = ms.GetBuffer();
                }
                string str = Convert.ToBase64String(bytearray);

要流式传输然后是图像的字符串:

String to Stream and then to Image :

byte[] data = Convert.FromBase64String(str);
                        
            Stream memStream = new MemoryStream(data);

            WriteableBitmap wbimg = PictureDecoder.DecodeJpeg(memStream);

            image1.Source = wbimg;

谢谢

thanks

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