Well not that I know of but I may have misunderstood There is one method which is called which = checks if the meteorological wind bitmap has already been downloaded and saved to sdcard = if it has it uses that = if not it downloads a new one and saves that (this is where the error occurs
The overall methods is called as follows ThreadPool.QueueUserWorkItem(o => getwindMethod(ds)); However there are 4 buttons which send a different parameter (date or altitude) using 'ds' depending on which button is pressed. Does this constitute multiple threads? I couldnt see that it would because only one button can be pressed at a time and the previous procedure must have completed first. Secondly this error occurs even if one only presses on button and starts one thread? Have I misunderstood how threading works ? Can other threads be started even if the button is not pressed? Many thanks anyway Sri I really appreciate your help John Murray -----Original Message----- From: monodroid-boun...@lists.ximian.com [mailto:monodroid-boun...@lists.ximian.com] On Behalf Of SRI Sent: 23 September 2011 14:50 To: j...@murray.gb.com; Discussions related to Mono for Android Subject: Re: [mono-android] sharing violation trying to save a bitmap Hi Are you creating multiple Threads to call saveBMP, In that case only you will see this type of jumping in code? Best Regards, Sridharan Srinivasan Alias Sri. On Fri, Sep 23, 2011 at 6:57 PM, John Murray <j...@murray.gb.com> wrote: > I cant understand whats going on here > > In MonoDevelop I just get an unhandled exception > > In Vis studio I get more of a clue as it says theres a sharing violation > > > > Weirdly stepping through in the debugger it seems to go round the loop twice > (i.e. it steps down to Bitmap.compress then springs back to the File.Exists > line and steps through it again > > hence one can understand that if the stream is already open there may be a > sharing issue > > But why does it go round twice? It gets to the line Bitmap.Compress() then > loops back to File.Exists(); > > If I remove the File.Exists code then it crashes out at Bitmap.Compress with > the contradictory message > > System.IO.IOException: Win32 IO returned ERROR_SUCCESS > > > > If the File.Exists code is left in I get a sharing violation when it gets to > the Fielstream line > > Presumably because FS is still open having already run through that code > once before. > > What is going on why does it suddenly decide to revisit the earlier lines > of code? Or run through a line of code twice? > > > > > > public static void saveBMP(Context cntxt,string filename) > > { > > if (File.Exists(filename)) // shouldn't have to do this if > FileShare.Delete is working as I understand it > > { > > File.Delete(filename); // on second loop around it > deletes file but then there is an error with file does not exist > > } > > > > FileStream fs = new FileStream(filename, FileMode.Create, > FileAccess.Write, FileShare.Delete); > > System.IO.BufferedStream buf = new System.IO.BufferedStream(fs); > > Bitmap bmp = WXclass5.windmap; > > bmp.Compress(Bitmap.CompressFormat.Png, 90, buf); > > fs.Close(); > > buf.Close(); > > bmp = null; > > //fout.Close(); > > WXclass5.pnglist = getlistpngs(cntxt); > > } > > > > > > _______________________________________________ > Monodroid mailing list > Monodroid@lists.ximian.com > > UNSUBSCRIBE INFORMATION: > http://lists.ximian.com/mailman/listinfo/monodroid > > -- Sridharan Srinivasan Alias Sri Ph:(65)98255785/(65)63922439 www.arshu.com _______________________________________________ Monodroid mailing list Monodroid@lists.ximian.com UNSUBSCRIBE INFORMATION: http://lists.ximian.com/mailman/listinfo/monodroid _______________________________________________ Monodroid mailing list Monodroid@lists.ximian.com UNSUBSCRIBE INFORMATION: http://lists.ximian.com/mailman/listinfo/monodroid
