El jue, 19-09-2013 a las 18:51 +0300, Egor Egorov escribió: > Hello. > > This simple reduced test case crashes at JSStringGetMaximumUTF8CStringSize(). > Actually I tried a few options to get the string value back from webkit2 > instance and googled a lot to no avail. > > It segfaults both on gtk webkit 2.0.4 and 2.1.92, both built by gcc 4.8.1 on > Ubuntu 13.04 with all packages updated. > > Any chance to fix it?
The problem is that you are not including the JSC headers required to
use the JSC API, simply add:
#include <JavaScriptCore/JSStringRef.h>
#include <JavaScriptCore/JSValueRef.h>
And it works. I wonder why that builds, giving only compile warnings,
though.
> #include <gtk/gtk.h>
> #include <webkit2/webkit2.h>
>
>
> void gotInnerHtml(GObject *object, GAsyncResult *result, gpointer data) {
> WebKitJavascriptResult *js_result;
> JSValueRef value;
> JSGlobalContextRef context;
> GError *error = NULL;
>
> GtkWidget *webView = (GtkWidget *) data;
>
> js_result =
> webkit_web_view_run_javascript_finish(WEBKIT_WEB_VIEW(webView), result,
> &error);
> if (!js_result) {
> g_warning ("Error running javascript: %s", error->message);
> g_error_free (error);
> return;
> }
>
> context = webkit_javascript_result_get_global_context(js_result);
> value = webkit_javascript_result_get_value(js_result);
>
> if (JSValueIsString (context, value)) {
> JSStringRef js_str_value;
> gchar *str_value;
> gsize str_length;
>
> js_str_value = JSValueToStringCopy (context, value, NULL);
>
> str_length = JSStringGetMaximumUTF8CStringSize(js_str_value);
> // crashes here
> str_value = (gchar *)g_malloc (str_length);
>
> JSStringGetUTF8CString (js_str_value, str_value, str_length);
> JSStringRelease (js_str_value);
>
> g_print ("Script result: %s\n", str_value);
> g_free (str_value);
> } else {
> g_warning ("Error running javascript: unexpected return value");
> }
>
> webkit_javascript_result_unref (js_result);
> }
>
> void getInnerHtml(GtkWidget *webView) {
> webkit_web_view_run_javascript(WEBKIT_WEB_VIEW(webView), "'a little
> string';", NULL, gotInnerHtml, webView);
> }
>
> gboolean doGetHtml(gpointer data) {
> getInnerHtml((GtkWidget *)data);
> return FALSE;
> }
>
> int main(int argc, char* argv[]) {
> printf("Version %d.%d.%d\n", webkit_get_major_version(),
> webkit_get_minor_version(), webkit_get_micro_version());
> gtk_init(&argc, &argv);
>
> GtkWidget *mainWebWindow = gtk_window_new(GTK_WINDOW_TOPLEVEL);
> gtk_window_set_default_size(GTK_WINDOW(mainWebWindow), 800, 600);
>
> GtkWidget *webView = webkit_web_view_new();
>
> gtk_container_add(GTK_CONTAINER(mainWebWindow), webView);
>
> WebKitURIRequest *request =
> webkit_uri_request_new("http://www.google.com/";);
> webkit_web_view_load_request(WEBKIT_WEB_VIEW(webView), request);
>
> GtkWidget *window1 = gtk_widget_get_toplevel(webView);
> gtk_widget_show_all(window1);
>
> g_timeout_add(2000, doGetHtml, webView);
>
> gtk_main();
>
> return 0;
> }
>
>
>
--
Carlos Garcia Campos
http://pgp.rediris.es:11371/pks/lookup?op=get&search=0xF3D322D0EC4582C3
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