Hi folks,
I've just encountered a very strange exception in one of my Gtk# apps, which
makes use of webkit-sharp. It occurs every time I try to load some HTML into
the WebView:
Exception in Gtk# callback delegate
Note: Applications can use GLib.ExceptionManager.UnhandledException to
handle the exception.
System.Exception: args.RetVal or 'out' property unset or set to incorrect type
in WebKit.NavigationRequestedHandler callback
at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e,
Boolean is_terminal) in /usr/src/packages/BUILD/gtk-
sharp-2.12.9/glib/ExceptionManager.cs:line 58
at WebKit.WebView.NavigationRequestedSignalCallback(IntPtr arg0, IntPtr
arg1, IntPtr arg2, IntPtr gch)
at WebKit.WebView.webkit_web_view_load_html_string(IntPtr , IntPtr , IntPtr
)
at WebKit.WebView.LoadHtmlString(System.String content, System.String
base_uri)
at iwawi.cockpits.TeleSalesCockpit.ReadBrowserPage(Int32 customerID) in
/home/jacek/Documents/Projects/iwawi/iwawi/cockpits/TeleSalesCockpit.cs:line
314
at
iwawi.cockpits.TeleSalesCockpit.OnCustomerSelectionTreeViewItemActivated(System.Object
o, Gtk.RowActivatedArgs args) in
/home/jacek/Documents/Projects/iwawi/iwawi/cockpits/TeleSalesCockpit.cs:line
210
This is my sourcecode:
private void InitBrowser ()
{
browser = new WebView();
this.browser.Editable = false;
this.browser.LoadHtmlString("<html></html>", null);
this.browser.NavigationRequested +=
new
NavigationRequestedHandler(this.OnLinkActivatedInBrowser);
this.browser.HoveringOverLink +=
new
HoveringOverLinkHandler(OnHoveringOverLinkInBrowser);
this.browserScrollPane.AddWithViewport(this.browser);
this.browserScrollPane.ShowAll();
}
private void ReadBrowserPage (int customerID)
{
string html = "";
this.Hourglass = true;
StringBuilder sb = new StringBuilder();
try {
IDbCommand cmd =
this.handler.conn.CreateCommand();
sb.Append("SELECT * FROM
appdata.skeleton_cockpit_telesales (\'");
sb.Append(ApplicationInfo.language);
sb.Append("\', ");
sb.Append(customerID);
sb.Append(") AS cockpit_page;");
cmd.CommandText = sb.ToString();
IDataReader r = cmd.ExecuteReader();
if ((r.Read())) {
html = (r ["cockpit_page"]).ToString();
}
r.Close();
r = null;
this.Hourglass = false;
}
catch (NpgsqlException ex) {
this.Hourglass = false;
GeneralUseDialog errorDialog = new
GeneralUseDialog
("Cockpit konnte nicht aufgebaut
werden. Ursache:\n" + ex.Message,
"Abfrage gescheitert",
Gtk.IconTheme.Default.LoadIcon("gtk-dialog-error",
32, 0),
false);
}
this.browser.LoadHtmlString(html, null);
}
First I call InitBrowser() to initialize the browser window and to implant it
into my application. Then I add two event handlers (one for hovering, one for
navigation events). And when I try to put some HTML into the browser by
calling ReadBrowserPage(), the crash happens.
However, when I do not add the navigation event handler, everything works
fine.
Any ideas how to get this issue resolved? Thank you for all helpful advice.
Regards
Jacek Rużyczka
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