examples: remove the curlgtk.c example

- it does not add a lot of value
- we do not test-build it to verify because of its dependencies
- unclear for what GTK versions it works or not

Reported-by: odek86 on github

Fixes #10197
Closes #10198

docs/examples/Makefile.inc

@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2023, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -123,7 +123,6 @@ check_PROGRAMS = \
 COMPLICATED_EXAMPLES = \
   cacertinmem.c \
   crawler.c \
-  curlgtk.c \
   ephiperfifo.c \
   evhiperfifo.c \
   ghiper.c \

docs/examples/curlgtk.c

@@ -1,119 +0,0 @@
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (c) 2000 - 2022 David Odin (aka DindinX) for MandrakeSoft
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at https://curl.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- * SPDX-License-Identifier: curl
- *
- ***************************************************************************/
-/* <DESC>
- * use the libcurl in a gtk-threaded application
- * </DESC>
- */
-
-#include <stdio.h>
-#include <gtk/gtk.h>
-
-#include <curl/curl.h>
-
-GtkWidget *Bar;
-
-static size_t my_write_func(void *ptr, size_t size, size_t nmemb, FILE *stream)
-{
-  return fwrite(ptr, size, nmemb, stream);
-}
-
-static size_t my_read_func(char *ptr, size_t size, size_t nmemb, FILE *stream)
-{
-  return fread(ptr, size, nmemb, stream);
-}
-
-static int my_progress_func(GtkWidget *bar,
-                            double t, /* dltotal */
-                            double d, /* dlnow */
-                            double ultotal,
-                            double ulnow)
-{
-/*  printf("%d / %d (%g %%)\n", d, t, d*100.0/t);*/
-  gdk_threads_enter();
-  gtk_progress_set_value(GTK_PROGRESS(bar), d*100.0/t);
-  gdk_threads_leave();
-  return 0;
-}
-
-static void *my_thread(void *ptr)
-{
-  CURL *curl;
-
-  curl = curl_easy_init();
-  if(curl) {
-    gchar *url = ptr;
-    const char *filename = "test.curl";
-    FILE *outfile = fopen(filename, "wb");
-
-    curl_easy_setopt(curl, CURLOPT_URL, url);
-    curl_easy_setopt(curl, CURLOPT_WRITEDATA, outfile);
-    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, my_write_func);
-    curl_easy_setopt(curl, CURLOPT_READFUNCTION, my_read_func);
-    curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
-    curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, my_progress_func);
-    curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, Bar);
-
-    curl_easy_perform(curl);
-
-    fclose(outfile);
-    /* always cleanup */
-    curl_easy_cleanup(curl);
-  }
-
-  return NULL;
-}
-
-int main(int argc, char **argv)
-{
-  GtkWidget *Window, *Frame, *Frame2;
-  GtkAdjustment *adj;
-
-  /* Must initialize libcurl before any threads are started */
-  curl_global_init(CURL_GLOBAL_ALL);
-
-  /* Init thread */
-  g_thread_init(NULL);
-
-  gtk_init(&argc, &argv);
-  Window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
-  Frame = gtk_frame_new(NULL);
-  gtk_frame_set_shadow_type(GTK_FRAME(Frame), GTK_SHADOW_OUT);
-  gtk_container_add(GTK_CONTAINER(Window), Frame);
-  Frame2 = gtk_frame_new(NULL);
-  gtk_frame_set_shadow_type(GTK_FRAME(Frame2), GTK_SHADOW_IN);
-  gtk_container_add(GTK_CONTAINER(Frame), Frame2);
-  gtk_container_set_border_width(GTK_CONTAINER(Frame2), 5);
-  adj = (GtkAdjustment*)gtk_adjustment_new(0, 0, 100, 0, 0, 0);
-  Bar = gtk_progress_bar_new_with_adjustment(adj);
-  gtk_container_add(GTK_CONTAINER(Frame2), Bar);
-  gtk_widget_show_all(Window);
-
-  if(!g_thread_create(&my_thread, argv[1], FALSE, NULL) != 0)
-    g_warning("cannot create the thread");
-
-  gdk_threads_enter();
-  gtk_main();
-  gdk_threads_leave();
-  return 0;
-}