windows 8 - Save InkManager images to byte array -


i'm new win8 app programming has been assigned write windows store app capture customers' signature , save sql server. after research found great tutorial http://www.codeproject.com/articles/416878/metro-paint shows how draw , save image locally. question how use inkmanager class in tutorial save image byte arrays can save image sqlserver? thanks!

    private async void btnsavewritingasimage_click(object sender, routedeventargs e)     {         if (myinkmanager.getstrokes().count > 0)         {             try             {                 windows.storage.pickers.filesavepicker savepicker = new windows.storage.pickers.filesavepicker();                 savepicker.suggestedstartlocation = windows.storage.pickers.pickerlocationid.desktop;                 savepicker.defaultfileextension = ".png";                 savepicker.filetypechoices.add("png", new string[] { ".png" });                 savepicker.filetypechoices.add("jpg", new string[] { ".jpg" });                 storagefile filesave = await savepicker.picksavefileasync();                 ioutputstream ab = await filesave.openasync(fileaccessmode.readwrite);                 if (ab != null)                     await myinkmanager.saveasync(ab);             }              catch (exception)             {                 var msgdlg = new messagedialog("only handwriting can saved image.", "error while saving");                 msgdlg.showasync();             }         }         else         {             var msgdlg = new messagedialog("only handwriting can saved image.", "error while saving");             await msgdlg.showasync();         }     }

add: (ibuffer.toarray() defined in windowsruntimebufferextensions)

using system.runtime.interopservices.windowsruntime;

then do: 

var buffer = await fileio.readbufferasync(image);//replace ab instead of image var bytes = buffer.toarray();

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