PureBasic Forums - English

Posted: **Thu Mar 25, 2021 1:32 pm**

I found out that the web gadget on Linux is not as complete as its Windows counterpart. I did find this thread with a couple of improvements but nothing for #PB_Web_Busy.

Has anyone found a workaround for this?

Posted: **Thu Mar 25, 2021 2:51 pm**

If you want to use #PB_Web_Busy to detect when a download has ended by polling for #False, I don't advise this method because I have already made the experience that on some websites #PB_Web_Busy changes sometimes to #False and shortly afterwards back to #True because some components still need loading and therefore the download is still not completed. The best method on WebGadgets using WebKit should be to evaluate the signal "document-load-finished" (tested successfully on Linux Mint 19.3 x64 'Tricia' with Cinnamon using PB 5.73 x64):

Code: Select all

URL.S = "http://www.google.com"

ProcedureC DocumentLoadCompleted(WebView.I, WebFrame.I, UserData.I)
  MessageRequester("Info", "Loading of web page has completed!")
EndProcedure

WindowID = OpenWindow(#PB_Any, 0, 0, 1000, 800,
  "Detect completion of loading web page",
  #PB_Window_SystemMenu | #PB_Window_ScreenCentered)
WebGadget(0, 5, 5, WindowWidth(WindowID) - 10, WindowHeight(WindowID) - 10, URL)

g_signal_connect_(GadgetID(0), "document-load-finished",
  @DocumentLoadCompleted(), 0)

Repeat
Until WaitWindowEvent() = #PB_Event_CloseWindow

If you want to find out the current status when loading a website, you may try the following example:

Code: Select all

Enumeration WebKitLoadStatus
  #WEBKIT_LOAD_PROVISIONAL
  #WEBKIT_LOAD_COMMITTED
  #WEBKIT_LOAD_FINISHED
  #WEBKIT_LOAD_FIRST_VISUALLY_NON_EMPTY_LAYOUT
  #WEBKIT_LOAD_FAILED
EndEnumeration

ImportC "-lwebkitgtk-3.0"
  webkit_web_view_get_load_status(*WebView)
EndImport

URL.S = "https://www.google.de"

WindowID = OpenWindow(#PB_Any, 100, 100, 1000, 800,
  "Display status of loading web page",
  #PB_Window_SystemMenu | #PB_Window_ScreenCentered)
WebGadget(0, 5, 5, WindowWidth(WindowID) - 10, WindowHeight(WindowID) - 10, URL)

Repeat
  WindowEvent = WaitWindowEvent()

  If WebPageLoadCompleted = #False
    Select webkit_web_view_get_load_status(GadgetID(0))
      Case #WEBKIT_LOAD_PROVISIONAL
        Debug "No data received yet, empty structures have been allocated"
      Case #WEBKIT_LOAD_COMMITTED
        Debug "First data chunk has arrived"
      Case #WEBKIT_LOAD_FINISHED
        WebPageLoadCompleted = #True
        Debug "Loading of web page has completed"
      Case #WEBKIT_LOAD_FIRST_VISUALLY_NON_EMPTY_LAYOUT
        Debug "First layout with visual content has started"
      Case #WEBKIT_LOAD_FAILED
        WebPageLoadCompleted = #True
        Debug "Loading of web page has failed"
        Break
    EndSelect
  EndIf
Until WindowEvent = #PB_Event_CloseWindow

Posted: **Thu Mar 25, 2021 5:59 pm**

Thank you for this. I'm unfamiliar with this library and "document-load-finished" works as expected. You're right that the page can do other things that will cause the value to flip. But what is it?

Is it JavaScript? Websites are telling me that it's not enabled; tested on Debian 9.x and CentOS 7.x but I can confirm that content can continue to load.

Tested on https://www.whatismybrowser.com/detect/ ... pt-enabled

I'm also having problems if the site I try to visit has Cloudflare.

PureBasic Forums - English

Has anyone found a workaround for #PB_Web_Busy on Linux?

Has anyone found a workaround for #PB_Web_Busy on Linux?

Re: Has anyone found a workaround for #PB_Web_Busy on Linux?

Re: Has anyone found a workaround for #PB_Web_Busy on Linux?