Windows 8 Metro style development (8)-Image Compression

Currently, there is no image compression API in the Win8 SDK, which can only be processed by third-party class libraries. Unfortunately, there are no third-party class libraries dedicated to Win8 image compression. However, Win8 APIs are similar to Silverlight APIs, so you can port them directly from Silverlight.

I found a library source code for the Silverlight version of lib2.16.net. After a simple modification, I changed it to the image compression processing class library of the Win8 version. This class library can compress images by quality percentage.

BelowCode.

     Protected   Override   Async   Void  Onnavigatedto (navigationeventargs e ){  String STR = "  Http://gimg.vancl.com/img/02/8705542.jpg  "  ; VaR Storagefile = Await Windows. Storage. storagefile. createstreamedfilefromuriasync ( "  Temp.jpg  " , New Uri (STR, urikind. Absolute ), Null  );  VaR File = Await  Storagefile. openasync (Windows. Storage. fileaccessmode. Read );  //  Source image Bitmapimage bitimage1 = New  Bitmapimage (); bitimage1.setsource (File); IMG. Source = Bitimage1; TXT. Text = "  Source image size:  " + File. size;  //  Source image compression              VaR Required image = New  Using Image (file. asstream (); system. Io. memorystream stream =New  Memorystream (); writable image. writejpeg (stream,  New Compressionparameters () {Quality = 20 }); //  The compression quality is 20%.              Byte [] Buffer = New   Byte  [Stream. Length]; stream. Seek (  0  , Seekorigin. Begin); stream. Read (buffer,  0 , Buffer. Length );  VaR Ibuffer = Cryptographicbuffer. createfrombytearray (buffer); inmemoryrandomaccessstream memoryrandomstream = New  Inmemoryrandomaccessstream ();  Await  Memoryrandomstream. writeasync (ibuffer); memoryrandomstream. Seek (  0  ); Bitmapimage bitimage2 = New Bitmapimage (); bitimage2.setsource (memoryrandomstream); img2.source = Bitimage2; txt2.text = "  Size of the compressed image:  " + Memoryrandomstream. size ;} 

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