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-rw-r--r--docs/examples/smooth-gtk-thread.c217
1 files changed, 217 insertions, 0 deletions
diff --git a/docs/examples/smooth-gtk-thread.c b/docs/examples/smooth-gtk-thread.c
new file mode 100644
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+++ b/docs/examples/smooth-gtk-thread.c
@@ -0,0 +1,217 @@
+/*****************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * $Id$
+ *
+ * This is a multi threaded application that uses a progress bar to show
+ * status. It uses Gtk+ to make a smooth pulse.
+ *
+ * Written by Jud Bishop after studying the other examples provided with
+ * libcurl.
+ *
+ * To compile (on a single line):
+ * gcc -ggdb `pkg-config --cflags --libs gtk+-2.0` -lcurl -lssl -lcrypto
+ * -lgthread-2.0 -dl smooth-gtk-thread.c -o smooth-gtk-thread
+ */
+
+#include <stdio.h>
+#include <gtk/gtk.h>
+#include <glib.h>
+#include <unistd.h>
+#include <pthread.h>
+
+#include <curl/curl.h>
+#include <curl/types.h> /* new for v7 */
+#include <curl/easy.h> /* new for v7 */
+
+#define NUMT 4
+
+pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
+int j = 0;
+gint num_urls = 9; /* Just make sure this is less than urls[]*/
+char *urls[]= {
+ "90022",
+ "90023",
+ "90024",
+ "90025",
+ "90026",
+ "90027",
+ "90028",
+ "90029",
+ "90030"
+};
+
+size_t write_file(void *ptr, size_t size, size_t nmemb, FILE *stream)
+{
+ /* printf("write_file\n"); */
+ return fwrite(ptr, size, nmemb, stream);
+}
+
+/* http://xoap.weather.com/weather/local/46214?cc=*&dayf=5&unit=i */
+void *pull_one_url(void *NaN)
+{
+ CURL *curl;
+ CURLcode res;
+ gchar *http;
+ FILE *outfile;
+ gint i;
+
+ /* Stop threads from entering unless j is incremented */
+ pthread_mutex_lock(&lock);
+ while ( j < num_urls )
+ {
+ printf("j = %d\n", j);
+
+ http =
+ g_strdup_printf("xoap.weather.com/weather/local/%s?cc=*&dayf=5&unit=i\n",
+ urls[j]);
+
+ printf( "http %s", http );
+
+ curl = curl_easy_init();
+ if(curl)
+ {
+
+ outfile = fopen(urls[j], "w");
+ /* printf("fopen\n"); */
+
+ /* Set the URL and transfer type */
+ curl_easy_setopt(curl, CURLOPT_URL, http);
+
+ /* Write to the file */
+ curl_easy_setopt(curl, CURLOPT_WRITEDATA, outfile);
+ curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_file);
+
+ j++; /* critical line */
+ pthread_mutex_unlock(&lock);
+
+ res = curl_easy_perform(curl);
+
+ fclose(outfile);
+ printf("fclose\n");
+
+ curl_easy_cleanup(curl);
+ }
+ g_free (http);
+
+ /* Adds more latency, testing the mutex.*/
+ sleep(1);
+
+ } /* end while */
+ return NULL;
+}
+
+
+gboolean pulse_bar(gpointer data)
+{
+ gdk_threads_enter();
+ gtk_progress_bar_pulse (GTK_PROGRESS_BAR (data));
+ gdk_threads_leave();
+
+ /* Return true so the function will be called again;
+ * returning false removes this timeout function.
+ */
+ return TRUE;
+}
+
+void *create_thread(void *progress_bar)
+{
+ pthread_t tid[NUMT];
+ int i;
+ int error;
+
+ /* Make sure I don't create more threads than urls. */
+ for(i=0; i < NUMT && i < num_urls ; i++) {
+ error = pthread_create(&tid[i],
+ NULL, /* default attributes please */
+ pull_one_url,
+ NULL);
+ if(0 != error)
+ fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
+ else
+ fprintf(stderr, "Thread %d, gets %s\n", i, urls[i]);
+ }
+
+ /* Wait for all threads to terminate. */
+ for(i=0; i < NUMT && i < num_urls; i++) {
+ error = pthread_join(tid[i], NULL);
+ fprintf(stderr, "Thread %d terminated\n", i);
+ }
+
+ /* This stops the pulsing if you have it turned on in the progress bar
+ section */
+ g_source_remove(GPOINTER_TO_INT(g_object_get_data(G_OBJECT(progress_bar),
+ "pulse_id")));
+
+ /* This destroys the progress bar */
+ gtk_widget_destroy(progress_bar);
+
+ /* [Un]Comment this out to kill the program rather than pushing close. */
+ /* gtk_main_quit(); */
+
+
+ return NULL;
+
+}
+
+static gboolean cb_delete(GtkWidget *window, gpointer data)
+{
+ gtk_main_quit();
+ return FALSE;
+}
+
+int main(int argc, char **argv)
+{
+ GtkWidget *top_window, *outside_frame, *inside_frame, *progress_bar;
+ GtkAdjustment *adj;
+
+ /* Init thread */
+ g_thread_init(NULL);
+ gdk_threads_init ();
+ gdk_threads_enter ();
+
+ gtk_init(&argc, &argv);
+
+ /* Base window */
+ top_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+
+ /* Frame */
+ outside_frame = gtk_frame_new(NULL);
+ gtk_frame_set_shadow_type(GTK_FRAME(outside_frame), GTK_SHADOW_OUT);
+ gtk_container_add(GTK_CONTAINER(top_window), outside_frame);
+
+ /* Frame */
+ inside_frame = gtk_frame_new(NULL);
+ gtk_frame_set_shadow_type(GTK_FRAME(inside_frame), GTK_SHADOW_IN);
+ gtk_container_set_border_width(GTK_CONTAINER(inside_frame), 5);
+ gtk_container_add(GTK_CONTAINER(outside_frame), inside_frame);
+
+ /* Progress bar */
+ progress_bar = gtk_progress_bar_new();
+ gtk_progress_bar_pulse (GTK_PROGRESS_BAR (progress_bar));
+ /* Make uniform pulsing */
+ gint pulse_ref = g_timeout_add (300, pulse_bar, progress_bar);
+ g_object_set_data(G_OBJECT(progress_bar), "pulse_id",
+ GINT_TO_POINTER(pulse_ref));
+ gtk_container_add(GTK_CONTAINER(inside_frame), progress_bar);
+
+ gtk_widget_show_all(top_window);
+ printf("gtk_widget_show_all\n");
+
+ g_signal_connect(G_OBJECT (top_window), "delete-event",
+ G_CALLBACK(cb_delete), NULL);
+
+ if (!g_thread_create(&create_thread, progress_bar, FALSE, NULL) != 0)
+ g_warning("can't create the thread");
+
+ gtk_main();
+ gdk_threads_leave();
+ printf("gdk_threads_leave\n");
+
+ return 0;
+}
+