vb.net - Write and read to text file on usb drive in Windows iot -


i have raspberry pi 3 windows iot core on it. i'm making app visual studio 2017.

i want read , write textfile on usb drive connected pi.

i looked around site , find same question of them don't work me.

this have!!

the mainpage

imports windows.storage imports windows.devices.usb imports windows.devices.enumeration   public notinheritable class mainpage inherits page  protected overrides sub onnavigatedto(e navigationeventargs)     opendeviceasync() end sub  private async sub opendeviceasync()     dim externaldevices storagefolder = knownfolders.removabledevices     dim externaldrives ireadonlylist(of storagefolder) = await externaldevices.getfoldersasync()     dim sdcard storagefolder = externaldrives(0)     if sdcard isnot nothing         dim storagefolder storagefolder = knownfolders.removabledevices         dim samplefile storagefile = await sdcard.createfileasync("sample.txt", creationcollisionoption.replaceexisting)     end if end sub   end class

the package.appxmanifest file addes usb capability

<capabilities> <capability name="internetclient" /> <uap:capability name="removablestorage" />   <devicecapability name="serialcommunication">       <device id="any">           <function type="name:serialport" />       </device>   </devicecapability>

and .txt extension

<extensions>     <uap:extension category="windows.filetypeassociation">       <uap:filetypeassociation name="text">         <uap:supportedfiletypes>           <uap:filetype>.txt</uap:filetype>         </uap:supportedfiletypes>       </uap:filetypeassociation>     </uap:extension>   </extensions>

then when want start app thru remote machine on pi 3, visual studio stops , give's following page "app.g.i.vb" text in yellow

#if debug andalso not disable_xaml_generated_break_on_unhandled_exception      addhandler me.unhandledexception,         sub(sender global.system.object, unhandledexceptionargs  global.windows.ui.xaml.unhandledexceptioneventargs)             if global.system.diagnostics.debugger.isattached                 global.system.diagnostics.debugger.break() <----- yellow             end if         end sub #end if

can maby me please. in future want read .jpg files usb storage


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