保存并加载writablebitmap [英] Save and load a writablebitmap

问题描述

我必须将一个writablebitmap写入一个文件，然后从同一个文件加载writablebitmap。

我的图像是正方形（ss x ss resolution）

此代码将writablebitmap写入文件

 StreamWriter writeFile = new StreamWriter（new IsolatedStorageFileStream（" tmp / tmp。 img"，FileMode.Create，myStore））; 
 BinaryWriter bw = new BinaryWriter（writeFile.BaseStream）; 
 for（int i = 0; i< wb.Pixels.Length; i ++）
 {
 bw.Write（wb.Pixels [i]）; 
} 
 writeFile.Flush（）; 
 writeFile.Close（）; 
 writeFile.Dispose（）; 

此代码读取相同的文件

 
 StreamReader sr = new StreamReader（new IsolatedStorageFileStream（" tmp / tmp.img"，FileMode.Open，myStore））; 
 BinaryReader br = new BinaryReader（sr.BaseStream）; 
 WriteableBitmap wb = new WriteableBitmap（（int）Math.Sqrt（sr.BaseStream.Length / sizeof（int）），（int）Math.Sqrt（sr.BaseStream.Length / sizeof（int）））; 
 
 int k = 0; 
 
 sr.BaseStream.Seek（0，SeekOrigin.Begin）; 
 while（sr.BaseStream.Position< sr.BaseStream.Length）
 {
 wb.Pixels [k] = br.ReadInt32（）; 
 k ++; 
} 
  wb.Invalidate（）; 
&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; sr.Close（）; 
&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; sr.Dispose（）; 
 
 

但阅读速度非常慢。

如何提高代码的速度？

谢谢

解决方案

您是否考虑过使用
SaveJpeg 和
LoadJpeg ？

I have to write a writablebitmap to a file and then load the writablebitmap from the same file.

My image is square (ss x ss resolution)

This code write the writablebitmap to a file

StreamWriter writeFile = new StreamWriter(new IsolatedStorageFileStream("tmp/tmp.img", FileMode.Create, myStore));
            BinaryWriter bw = new BinaryWriter(writeFile.BaseStream);
            for (int i = 0; i < wb.Pixels.Length; i++)
            {
                bw.Write(wb.Pixels[i]);
            }
            writeFile.Flush();
            writeFile.Close();
            writeFile.Dispose();

And this code read the same file

  StreamReader sr = new StreamReader(new IsolatedStorageFileStream("tmp/tmp.img", FileMode.Open, myStore));
                BinaryReader br = new BinaryReader(sr.BaseStream);
                WriteableBitmap wb =  new WriteableBitmap((int)Math.Sqrt(sr.BaseStream.Length/sizeof(int)), (int)Math.Sqrt(sr.BaseStream.Length/sizeof(int)));
                
                int k=0;

                sr.BaseStream.Seek(0, SeekOrigin.Begin);
                while(sr.BaseStream.Position<sr.BaseStream.Length)
                {
                    wb.Pixels[k] = br.ReadInt32();
                    k++;
                }
 		wb.Invalidate();
                sr.Close();
                sr.Dispose();

But to read is very very slow.

How can I improve the speed of my code?

Thanks

解决方案

Have you considered using SaveJpeg and LoadJpeg?

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