GString基本操作一

alimyso

GString是Gtk+中非常实用的一个字符串操作结构，可以使对C语言中字符串操作指针不熟悉的程序员，快速的操作字符串，而且不出错，下面的代码演示了GString操作Append(追加)，Insert(指定位置插入)，OverWrite(指定位置复写)，Erase(指定位置删除)和Equal(比较)
作者：AlimysoYang

2. #include <gtk/gtk.h>
4. GtkWidget *wnd;
5. GtkWidget *vbox,*hbox,*et1,*et2,*et3,*btn,*btninsert,*btnoverwrite,*btnerase,*btnequal;
7. void ui_init()
8. {
9.     wnd = gtk_window_new(GTK_WINDOW_TOPLEVEL);
10.     gtk_window_set_title(GTK_WINDOW(wnd),"GString about prepend");
11.     gtk_window_set_position(GTK_WINDOW(wnd),GTK_WIN_POS_CENTER);
12.    
13.     vbox = gtk_vbox_new(TRUE,2);
14.     gtk_container_add(GTK_CONTAINER(wnd),vbox);
15.    
16.     et1 = gtk_entry_new();
17.     et2 = gtk_entry_new();
18.     et3 = gtk_entry_new();
19.     gtk_entry_set_editable(GTK_ENTRY(et3),FALSE);
20.    
21.     hbox = gtk_hbox_new(TRUE,2);
22.     btn = gtk_button_new_with_label("GString prepend");
23.     btninsert = gtk_button_new_with_label("GString insert");
24.     btnoverwrite = gtk_button_new_with_label("GString overwrite");
25.     btnerase = gtk_button_new_with_label("GString erase");
26.     btnequal = gtk_button_new_with_label("GString equal");
27.    
28.     gtk_box_pack_start_defaults(GTK_BOX(vbox),et1);
29.     gtk_box_pack_start_defaults(GTK_BOX(vbox),et2);
30.     gtk_box_pack_start_defaults(GTK_BOX(vbox),et3);
31.     gtk_box_pack_start_defaults(GTK_BOX(vbox),hbox);
32.    
33.     gtk_box_pack_start_defaults(GTK_BOX(hbox),btn);
34.     gtk_box_pack_start_defaults(GTK_BOX(hbox),btninsert);
35.     gtk_box_pack_start_defaults(GTK_BOX(hbox),btnoverwrite);
36.     gtk_box_pack_start_defaults(GTK_BOX(hbox),btnerase);
37.     gtk_box_pack_start_defaults(GTK_BOX(hbox),btnequal);
38.    
39.     gtk_widget_show_all(wnd);
40. }
42. static void btn_clicked(GtkButton *button,gpointer user_data)
43. {
44.     const gchar *str1 = gtk_entry_get_text(GTK_ENTRY(et1));
45.     const gchar *str2 = gtk_entry_get_text(GTK_ENTRY(et2));
46.     GString *gstr = g_string_new(str1);
47.     g_string_prepend(gstr,str2);
48.     g_string_up(gstr);
49.     gtk_entry_set_text(GTK_ENTRY(et3),gstr->str);
50.     g_string_free(gstr,TRUE);
51. }
53. static void btninsert_clicked(GtkButton *button,gpointer user_data)
54. {
55.     const gchar *str1 = gtk_entry_get_text(GTK_ENTRY(et1));
56.     const gchar *str2 = gtk_entry_get_text(GTK_ENTRY(et2));
57.     GString *gstr = g_string_new(str1);
58.     int len = gstr->len;
59.     int pos = len - 2;
60.     if (pos<0)
61.     pos = 0;
62.     g_string_insert(gstr,pos,str2);
63.     g_string_down(gstr);
64.     gtk_entry_set_text(GTK_ENTRY(et3),gstr->str);
65.     g_string_free(gstr,TRUE);
66. }
68. static void btnoverwrite_clicked(GtkButton *button,gpointer user_data)
69. {
70.     const gchar *str1 = gtk_entry_get_text(GTK_ENTRY(et1));
71.     const gchar *str2 = gtk_entry_get_text(GTK_ENTRY(et2));
72.     GString *gstr = g_string_new(str1);
73.     int len = gstr->len;
74.     int pos = len - 2;
75.     if (pos<0)
76.     pos = 0;
77.     g_string_overwrite(gstr,pos,str2);
78.     gtk_entry_set_text(GTK_ENTRY(et3),gstr->str);
79.     g_string_free(gstr,TRUE);
80. }
82. static void btnerase_clicked(GtkButton *button,gpointer user_data)
83. {
84.     const gchar *str = gtk_entry_get_text(GTK_ENTRY(et1));
85.     GString *gstr = g_string_new(str);
86.     int len = gstr->len;
87.     gssize pos = len - 4;
88.     g_string_erase(gstr,pos,2);
89.     gtk_entry_set_text(GTK_ENTRY(et3),gstr->str);
90.     g_string_free(gstr,TRUE);
91. }
93. static void btnequal_clicked(GtkButton *button,gpointer user_data)
94. {
95.     const gchar *str1 = gtk_entry_get_text(GTK_ENTRY(et1));
96.     const gchar *str2 = gtk_entry_get_text(GTK_ENTRY(et2));
97.     GString *gstr1,*gstr2;
98.     gstr1 = g_string_new(str1);
99.     gstr2 = g_string_new(str2);
100.     if (g_string_equal(gstr1,gstr2))
101.     g_printf("the same strings\n");
102.     else
103.     g_printf("the different strings\n");
104.     g_string_free(gstr1,TRUE);
105.     g_string_free(gstr2,TRUE);
106. }
108. int main(int argc,char *argv[])
109. {
110.     gtk_init(&argc,&argv);
111.    
112.     ui_init();
113.    
114.     g_signal_connect(G_OBJECT(wnd),"destroy",G_CALLBACK(gtk_main_quit),NULL);
115.     g_signal_connect(G_OBJECT(btn),"clicked",G_CALLBACK(btn_clicked),NULL);
116.     g_signal_connect(G_OBJECT(btninsert),"clicked",G_CALLBACK(btninsert_clicked),NULL);
117.     g_signal_connect(G_OBJECT(btnoverwrite),"clicked",G_CALLBACK(btnoverwrite_clicked),NULL);
118.     g_signal_connect(G_OBJECT(btnerase),"clicked",G_CALLBACK(btnerase_clicked),NULL);
119.     g_signal_connect(G_OBJECT(btnequal),"clicked",G_CALLBACK(btnequal_clicked),NULL);
120.     gtk_main();
121.     return 0;
122. }

复制代码

Tom

GString确实很方便，不用自己去考虑空间等问题了，学习了。。。

gtk-inkscape

先学习，再收藏。哈哈~~谢谢LZ。

liufanwei30