the words in red color is some more detail explanation
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/*** this section I have filled a buffer by the file input stream ***/
GError *error = NULL;
GInputStream *input_stream;
GFile *file = g_file_new_for_path("../Pictures/123.png");
GFileInfo *file_info = g_file_query_info(file, "*", G_FILE_QUERY_INFO_NONE, NULL, &error);
guint64 file_size = g_file_info_get_attribute_uint64(file_info, G_FILE_ATTRIBUTE_STANDARD_SIZE);
input_stream = g_file_read(file, NULL, &error);
guchar *buffer = g_malloc0(file_size);
g_printf("file size:%d, %d\n", sizeof(buffer), file_size);
g_input_stream_read(input_stream, buffer, file_size, NULL, &error);
/*** and in this section I use GdkPixbufLoader to load the data which in buffer into a Pixbuf, the gdk_pixbuf_loader_write() method returns true ***/
/*** thus the gdk_pixbuf_loader_close() method is called subsequently ***/
/*** but the two callback method below both never been called at all ***/
/*** is there anything wrong with my code ? ***/
/*** please help me ... thanks very much ***/
GdkPixbuf *pixbuf = NULL;
GdkPixbufLoader *loader = gdk_pixbuf_loader_new();
//GdkPixbufLoader *loader = gdk_pixbuf_loader_new_with_type("png",&error);
g_signal_connect(loader, "area-prepared", G_CALLBACK(gdk_pixbuf_loader_area_prepared), &pixbuf);
g_signal_connect(loader, "size-prepared", G_CALLBACK(gdk_pixbuf_loader_size_prepared), &pixbuf);
//g_signal_connect(loader, "closed", G_CALLBACK(gdk_pixbuf_loader_area_prepared), &pixbuf);
if(TRUE == gdk_pixbuf_loader_write(loader, buffer, sizeof(buffer), &error)){
//g_printf("Error Code: %d, Message: %s\n",error->code, error->message);
g_printf("success.\n");
}
gdk_pixbuf_loader_close(loader, NULL);
g_printf("loader closed.\n");
if(error != NULL){
g_error_free(error);
}
}
}
void gdk_pixbuf_loader_size_prepared(GdkPixbufLoader *loader, gint width, gint height, gpointer user_data) {
g_printf("%d, %d\n",width, height);
}
void gdk_pixbuf_loader_area_prepared(GdkPixbufLoader *loader, gpointer user_data){
g_printf("enter area_prepared handler.\n");
GdkPixbuf *pixbuf = *(GdkPixbuf **)user_data;
pixbuf = gdk_pixbuf_loader_get_pixbuf(loader);
image = gtk_image_new_from_pixbuf(pixbuf);
GdkRectangle rect;
rect.x = 0;
rect.y = 0;
rect.width = gdk_window_get_width(window->window);
rect.height = gdk_window_get_height(window->window);
gdk_window_invalidate_region(window->window, gdk_region_rectangle(&rect), TRUE);
gdk_window_process_updates(window->window, TRUE);
}
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