Re: Pango/GLib debugging in VS2015

Chun-wei Fan (范君維) via gtk-list <gtk-list@xxxxxxxxx> · Tue, 6 Jun 2017 08:45:51 +0800



    Hi Jeffrey,

      
      The issue seems like that we need to get PangoWin32 (and if you
      are doing this via Cairo, Cairo) thread-safe on Windows.  You
      might need to for the time being use a private thread (or so) to
      do this.

      
      With blessings, and cheers!

    
    Jeffrey Sheen 於 2017/6/6 上午 07:35 寫道:

    
      N.B. I've found pdb files related to the GTK DLLs
        distributed as part of the hexchat gtk-win32 project (https://github.com/hexchat/gtk-win32).
        

        Executing with these in place, the VS 2015 debugger is
          showing me that there is an intermittent issue when
          "pango_layout_clear_lines" is called.
        

        Ultimately a NULL pointer is passed to glib's
          "magazine_chain_prepare_fields" function.
        

        The issue can be recreated by creating and destroying a UI
          dialogue a specific number of times. Each text block in the UI
          dialogue is rendered by creating and destroying PangoLayout
          and PangoFontDescription objects.

          
          As this is an intermittent issue, and at a glib memory
          management level, I am not sure how to proceed.

          
          Any advice would be appreciated.

          
            On 5 June 2017 at 20:08, Jeffrey
              Sheen <jeffrey.sheen00@xxxxxxxxxxxxxxxxxxxxx>
              wrote:

              
                Dear list,

                  
                  I've got an issue with Pango, and have tried
                    asking around in the GTK channel on gnome.org, but no
                    bites.
                  

                  Memory Access Violations are occurring upon
                    PangoLayout function calls. I'm developing in MS
                    VS2015, with no error text sent to output terminal.

                    
                    It's a post "pango_layout_set_text" call to
                    "pango_layout_get_pixel_extents" that's bombing
                    out in "gobject-2.0.dll".

                    
                    Do you have any tips on how to debug GTK in  VS?

                  
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