GString基本操作一
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
#include <gtk/gtk.h>
GtkWidget *wnd;
GtkWidget *vbox,*hbox,*et1,*et2,*et3,*btn,*btninsert,*btnoverwrite,*btnerase,*btnequal;
void ui_init()
{
wnd = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(wnd),"GString about prepend");
gtk_window_set_position(GTK_WINDOW(wnd),GTK_WIN_POS_CENTER);
vbox = gtk_vbox_new(TRUE,2);
gtk_container_add(GTK_CONTAINER(wnd),vbox);
et1 = gtk_entry_new();
et2 = gtk_entry_new();
et3 = gtk_entry_new();
gtk_entry_set_editable(GTK_ENTRY(et3),FALSE);
hbox = gtk_hbox_new(TRUE,2);
btn = gtk_button_new_with_label("GString prepend");
btninsert = gtk_button_new_with_label("GString insert");
btnoverwrite = gtk_button_new_with_label("GString overwrite");
btnerase = gtk_button_new_with_label("GString erase");
btnequal = gtk_button_new_with_label("GString equal");
gtk_box_pack_start_defaults(GTK_BOX(vbox),et1);
gtk_box_pack_start_defaults(GTK_BOX(vbox),et2);
gtk_box_pack_start_defaults(GTK_BOX(vbox),et3);
gtk_box_pack_start_defaults(GTK_BOX(vbox),hbox);
gtk_box_pack_start_defaults(GTK_BOX(hbox),btn);
gtk_box_pack_start_defaults(GTK_BOX(hbox),btninsert);
gtk_box_pack_start_defaults(GTK_BOX(hbox),btnoverwrite);
gtk_box_pack_start_defaults(GTK_BOX(hbox),btnerase);
gtk_box_pack_start_defaults(GTK_BOX(hbox),btnequal);
gtk_widget_show_all(wnd);
}
static void btn_clicked(GtkButton *button,gpointer user_data)
{
const gchar *str1 = gtk_entry_get_text(GTK_ENTRY(et1));
const gchar *str2 = gtk_entry_get_text(GTK_ENTRY(et2));
GString *gstr = g_string_new(str1);
g_string_prepend(gstr,str2);
g_string_up(gstr);
gtk_entry_set_text(GTK_ENTRY(et3),gstr->str);
g_string_free(gstr,TRUE);
}
static void btninsert_clicked(GtkButton *button,gpointer user_data)
{
const gchar *str1 = gtk_entry_get_text(GTK_ENTRY(et1));
const gchar *str2 = gtk_entry_get_text(GTK_ENTRY(et2));
GString *gstr = g_string_new(str1);
int len = gstr->len;
int pos = len - 2;
if (pos<0)
pos = 0;
g_string_insert(gstr,pos,str2);
g_string_down(gstr);
gtk_entry_set_text(GTK_ENTRY(et3),gstr->str);
g_string_free(gstr,TRUE);
}
static void btnoverwrite_clicked(GtkButton *button,gpointer user_data)
{
const gchar *str1 = gtk_entry_get_text(GTK_ENTRY(et1));
const gchar *str2 = gtk_entry_get_text(GTK_ENTRY(et2));
GString *gstr = g_string_new(str1);
int len = gstr->len;
int pos = len - 2;
if (pos<0)
pos = 0;
g_string_overwrite(gstr,pos,str2);
gtk_entry_set_text(GTK_ENTRY(et3),gstr->str);
g_string_free(gstr,TRUE);
}
static void btnerase_clicked(GtkButton *button,gpointer user_data)
{
const gchar *str = gtk_entry_get_text(GTK_ENTRY(et1));
GString *gstr = g_string_new(str);
int len = gstr->len;
gssize pos = len - 4;
g_string_erase(gstr,pos,2);
gtk_entry_set_text(GTK_ENTRY(et3),gstr->str);
g_string_free(gstr,TRUE);
}
static void btnequal_clicked(GtkButton *button,gpointer user_data)
{
const gchar *str1 = gtk_entry_get_text(GTK_ENTRY(et1));
const gchar *str2 = gtk_entry_get_text(GTK_ENTRY(et2));
GString *gstr1,*gstr2;
gstr1 = g_string_new(str1);
gstr2 = g_string_new(str2);
if (g_string_equal(gstr1,gstr2))
g_printf("the same strings\n");
else
g_printf("the different strings\n");
g_string_free(gstr1,TRUE);
g_string_free(gstr2,TRUE);
}
int main(int argc,char *argv[])
{
gtk_init(&argc,&argv);
ui_init();
g_signal_connect(G_OBJECT(wnd),"destroy",G_CALLBACK(gtk_main_quit),NULL);
g_signal_connect(G_OBJECT(btn),"clicked",G_CALLBACK(btn_clicked),NULL);
g_signal_connect(G_OBJECT(btninsert),"clicked",G_CALLBACK(btninsert_clicked),NULL);
g_signal_connect(G_OBJECT(btnoverwrite),"clicked",G_CALLBACK(btnoverwrite_clicked),NULL);
g_signal_connect(G_OBJECT(btnerase),"clicked",G_CALLBACK(btnerase_clicked),NULL);
g_signal_connect(G_OBJECT(btnequal),"clicked",G_CALLBACK(btnequal_clicked),NULL);
gtk_main();
return 0;
}
GString确实很方便，不用自己去考虑空间等问题了，学习了。。。 先学习，再收藏。哈哈~~谢谢LZ。
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