利用GTK 和 libxml 编写词典软件

天天生活在linux下面，又是热岑于读英文文档的人，没有词典软件好悲剧啊。只能天天在浏览器里开有道来翻译。这个让人感觉太麻烦了。

虽然linux下也有几个不错的词典软件，如gold-dict之类的，gnome自带的那个软件我是没有用成功过，总是在卡死状态。

自己这一段也略懂点GTK，干脆自己写个算了。嘿嘿，当然功能还是很简单的啊。

主要还是通过有道词典的网页版来实现的。只不过将网页里面的信息进行提取，显示出来了。先上张效果图看看。

既然是linux下的软件，就要有点linux的风范。在单词查找框中输入ctrl + l的时候会清除原有的输入.

嗯。这个快捷键我是很喜欢啊。别人做的软件很多时候不会满足自己的一些需求啊。

贴完图就的贴代码，还是那样的，程序员之间代码才是最直接的交流语言。

#include <stdio.h>#include <string.h>#include <gtk/gtk.h>#include <libxml/parser.h>#include <libxml/tree.h>#include <libxml/HTMLparser.h>#include <libxml/xpath.h>#define KEY_WORD_XPATH "//div[@id='phrsListTab']"#define KEY_URL_PREFIX "http://dict.youdao.com/search?q="#define KEY_URL_SUFIX "&keyfrom=dict.index"GPtrArray * dict_get_translate(const gchar * keyword){gchar * key_url = NULL;htmlDocPtr html_doc = NULL;xmlDocPtr doc = NULL;xmlNodePtr clone = NULL;xmlXPathContextPtr ctx = NULL;xmlXPathObjectPtr obj = NULL;xmlNodeSetPtr nodeset = NULL;gchar * tmp_str = NULL;GPtrArray * result = NULL;gint i;key_url = g_strjoin(NULL, KEY_URL_PREFIX, keyword, KEY_URL_SUFIX, NULL);g_debug("KEY-URL: %s", key_url);html_doc = htmlReadFile(key_url, NULL, HTML_PARSE_NOWARNING | HTML_PARSE_NOERROR);if (!html_doc){g_message("KEY-URL %s get failed", key_url);goto out;}ctx = xmlXPathNewContext((xmlDocPtr)html_doc);if (!ctx){g_message("XPath context creat failed");goto out;}obj = xmlXPathEvalExpression(KEY_WORD_XPATH, ctx);if (!obj){g_message("XPath eval key word xpath failed");goto out;}if (xmlXPathNodeSetIsEmpty(obj->nodesetval)){g_message("XPath search keyword failed");goto out;}nodeset = obj->nodesetval;g_debug("Key word node set have %d object", nodeset->nodeNr);clone = xmlCopyNode(nodeset->nodeTab[0], 1);if (!clone)goto out;doc = xmlNewDoc("1.0");if (!doc)goto out;xmlDocSetRootElement(doc, clone);xmlXPathFreeContext(ctx);ctx = NULL;xmlXPathFreeObject(obj);obj = NULL;ctx = xmlXPathNewContext(doc);if (!ctx)goto out;obj = xmlXPathEvalExpression("//span[@class='keyword']", ctx);if (!obj)goto out;nodeset = obj->nodesetval;tmp_str = xmlNodeGetContent(nodeset->nodeTab[0]->xmlChildrenNode);g_debug("The word to search %s", tmp_str);xmlFree(tmp_str);tmp_str = NULL;xmlXPathFreeObject(obj);obj = NULL;obj = xmlXPathEvalExpression("//ul/li", ctx);if (!obj)goto out;if (xmlXPathNodeSetIsEmpty(obj->nodesetval)){g_message("Result value is empty");goto out;}nodeset = obj->nodesetval;result = g_ptr_array_sized_new(nodeset->nodeNr + 1);for (i = 0; i < nodeset->nodeNr; ++i){tmp_str = xmlNodeGetContent(nodeset->nodeTab[i]->xmlChildrenNode);g_ptr_array_add(result, tmp_str);}g_ptr_array_add(result, NULL);out:if (doc)xmlFreeDoc(doc);if (key_url)g_free(key_url);if (html_doc)xmlFreeDoc((xmlDocPtr)html_doc);if (ctx)xmlXPathFreeContext(ctx);if (obj)xmlXPathFreeObject(obj);return result;}void dict_present_result(gpointer data, gpointer user_data){g_printf("result: %s\n", data);}void dict_free_the_result(gpointer data, gpointer user_data){if (data)xmlFree(data);}#define DICTIONARY_TYPE_PANEL (dictionary_panel_get_type())#define DICTIONARY_PANEL(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), DICTIONARY_TYPE_PANEL, DictionaryPanel))#define DICTIONARY_IS_PANEL(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), DICTIONARY_TYPE_PANEL))#define DICTIONARY_PANEL_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass), DICTIONARY_TYPE_PANEL, DictionaryPanelClass))#define DICTIONARY_IS_PANEL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), DICTIONARY_TYPE_PANEL))#define DICTIONARY_PANEL_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj), DICTIONARY_TYPE_PANEL, DictionaryPanelClass))typedef struct _DictionaryPanel DictionaryPanel;typedef struct _DictionaryPanelClass DictionaryPanelClass;struct _DictionaryPanel{GtkWindow window;GtkWidget * entry;GtkWidget * text_view;GtkWidget * search_button;};struct _DictionaryPanelClass{GtkWindowClass parent_class;};GType dictionary_panel_get_type(void);static void dictionary_panel_class_init(DictionaryPanelClass * klass){}void dict_translate_word(GtkWidget * button, DictionaryPanel * panel){GPtrArray * result;GtkTextBuffer * text_buffer;const gchar * keyword = gtk_entry_get_text(GTK_ENTRY(panel->entry));gchar * tip;//here we should check the keywordif (strlen(keyword) == 0)return;text_buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(panel->text_view));result = dict_get_translate(keyword);if (result){tip = g_strjoinv("\n", (gchar **)result->pdata);g_ptr_array_foreach(result, dict_free_the_result, NULL);g_ptr_array_free(result, TRUE);}else{tip = g_strjoin(NULL, "Word ", keyword, " not found", NULL);}gtk_text_buffer_set_text(text_buffer, tip, -1);g_free(tip);}gboolean dict_filter_input_word(GtkWidget * entry, GdkEventKey * key, DictionaryPanel * panel){switch (key->keyval){case GDK_KEY_Return:dict_translate_word(NULL, panel);return TRUE;case GDK_KEY_L:case GDK_KEY_l:if (key->state & GDK_CONTROL_MASK){gtk_entry_set_text(GTK_ENTRY(panel->entry), "");return TRUE;}break;default:break;}return FALSE;}static void dictionary_panel_init(DictionaryPanel * self){GtkWidget * hbox, * vbox;GtkWidget * scrolled_window;GtkWidget * window = GTK_WIDGET(&self->window);gtk_widget_set_size_request(window, 500, 300);gtk_container_set_border_width(GTK_CONTAINER(window), 10);gtk_window_set_title(GTK_WINDOW(window), "Dictionary");g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);self->entry = gtk_entry_new();gtk_widget_add_events(self->entry, GDK_KEY_PRESS_MASK);g_signal_connect(window, "key-press-event", G_CALLBACK(dict_filter_input_word), self);self->text_view = gtk_text_view_new();gtk_text_view_set_editable(GTK_TEXT_VIEW(self->text_view), FALSE);self->search_button = gtk_button_new_from_stock(GTK_STOCK_FIND);g_signal_connect(self->search_button, "clicked", G_CALLBACK(dict_translate_word), self);hbox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 5);gtk_box_pack_start(GTK_BOX(hbox), self->entry, TRUE, TRUE, 0);gtk_box_pack_start(GTK_BOX(hbox), self->search_button, FALSE, FALSE, 0);scrolled_window = gtk_scrolled_window_new(NULL, NULL);gtk_container_add(GTK_CONTAINER(scrolled_window), self->text_view);vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 10);gtk_box_pack_start(GTK_BOX(vbox), hbox, FALSE, FALSE, 0);gtk_box_pack_start(GTK_BOX(vbox), scrolled_window, TRUE, TRUE, 0);gtk_container_add(GTK_CONTAINER(window), vbox);}GType dictionary_panel_get_type(void){static GType type = 0;if (type == 0){const GTypeInfo info = {sizeof (DictionaryPanelClass),NULL,NULL,(GClassInitFunc)dictionary_panel_class_init,NULL,NULL,sizeof(DictionaryPanel),0,(GInstanceInitFunc)dictionary_panel_init};type = g_type_register_static(GTK_TYPE_WINDOW, "Dictionary", &info, 0);}return type;}GtkWidget * dictionary_panel_new(void){DictionaryPanel * dict;dict = g_object_new(DICTIONARY_TYPE_PANEL, "type", GTK_WINDOW_TOPLEVEL, NULL);return GTK_WIDGET(dict);}int main(int ac, char ** av){GtkWidget * dict;gtk_init(&ac, &av);dict = dictionary_panel_new();gtk_widget_show_all(dict);gtk_main();return 0;}

顺便把 Makefile里面的东西也弄出来吧。这个代码里面需要引用libxml的东西

dict:dict.ccc -g -o $@ $< `pkg-config --cflags --libs libxml-2.0` `pkg-config --cflags --libs gtk+-3.0`

在解析有道词典返回的页面的时候认识到了XPath的东西。这个是个好东西啊。有时间的话，大家可以了解一下，很简单，但是很有用啊。

另外，这回写的代码采用了gobject的对象管理功能，代码写起来就是不一样啊，main函数一些简单了许多啊。并且传递参数也简单了许多。