gtk_entry_get_text：assertion'GTK_IS_ENTRY（entry）'failed

我正在用C++和GTK 3创建一个小程序（刚刚学习它），并且我遇到了这个问题。所以，我孤立了有问题的部分。gtk_entry_get_text：assertion'GTK_IS_ENTRY（entry）'failed

它被用来获取条目并在按钮被点击时打印它。

这是代码：

#include <iostream> 
#include <gtk/gtk.h> 

using namespace std; 

GtkWidget *wventana; 
GtkWidget *wgrid; 

//FUNCS 

void ventana(string titulo, int margen) 
{ 
    const char * tituloc = titulo.c_str(); 

    wventana = gtk_window_new (GTK_WINDOW_TOPLEVEL); 
    gtk_window_set_position (GTK_WINDOW (wventana), GTK_WIN_POS_CENTER); 
    gtk_window_set_title (GTK_WINDOW (wventana), tituloc); 
    gtk_container_set_border_width(GTK_CONTAINER(wventana), margen); 
} 

void grid() 
{ 
    wgrid = gtk_grid_new(); 
    gtk_container_add(GTK_CONTAINER(wventana), wgrid); 
    gtk_grid_set_row_spacing (GTK_GRID (wgrid), 10); 
    gtk_grid_set_column_spacing (GTK_GRID (wgrid), 25); 
} 

void boton_clic (GtkEntry *wentrada, gpointer user_data) 
{ 
    const char *nombre; 
    nombre = gtk_entry_get_text(wentrada); 
    cout << nombre << endl; 
} 

void entrada(int x, int y, int lx, int ly) 
{ 
    GtkWidget *wentrada; 
    wentrada = gtk_entry_new(); 
    gtk_grid_attach (GTK_GRID (wgrid), wentrada, x, y, lx, ly); 
} 

void boton(string texto, int x, int y, int lx, int ly) 
{ 
    const char * wtexto = texto.c_str(); 

    GtkWidget *wboton; 
    wboton = gtk_button_new_with_label (wtexto); 
    gtk_grid_attach (GTK_GRID (wgrid), wboton, x, y, lx, ly); 

    g_signal_connect (GTK_BUTTON (wboton), "clicked", G_CALLBACK (boton_clic), G_OBJECT  (wventana)); 
} 

//MAIN 

int main(int argc, char *argv[]) 
{ 
    gtk_init (&argc, &argv); 

    ventana("ventana",10); 
    grid(); 
    entrada(1, 1, 1, 1); 
    boton("Aprietame", 1, 2, 1, 1); 

    gtk_widget_show_all (wventana); 
    gtk_main(); 

    return 0; 
}

它没有得到的条目，并显示以下错误消息：

(boton:6669): Gtk-CRITICAL **: gtk_entry_get_text: assertion 'GTK_IS_ENTRY (entry)' failed

任何人都可以告诉的问题是什么？而且，我怎样才能使它工作？或者无论如何，这样做有什么好的选择？（它必须与分开的功能）

在此先感谢。

谢谢您的回答@ptomato，我想与大家提出的修改替换，得到了新的代码：

#include <iostream> 
#include <gtk/gtk.h> 

using namespace std; 

GtkWidget *wventana; 
GtkWidget *wgrid; 

//FUNCS 

void ventana(string titulo, int margen) 
{ 
    const char * tituloc = titulo.c_str(); 

    wventana = gtk_window_new (GTK_WINDOW_TOPLEVEL); 
    gtk_window_set_position (GTK_WINDOW (wventana), GTK_WIN_POS_CENTER); 
    gtk_window_set_title (GTK_WINDOW (wventana), tituloc); 
    gtk_container_set_border_width(GTK_CONTAINER(wventana), margen); 
} 

void grid() 
{ 
    wgrid = gtk_grid_new(); 
    gtk_container_add(GTK_CONTAINER(wventana), wgrid); 
    gtk_grid_set_row_spacing (GTK_GRID (wgrid), 10); 
    gtk_grid_set_column_spacing (GTK_GRID (wgrid), 25); 
} 

void boton_clic (GtkButton *wboton, GtkEntry *wentrada) 
{ 
    const char *nombre; 
    nombre = gtk_entry_get_text (wentrada); 
    cout << nombre << endl; 
} 

void entrada(int x, int y, int lx, int ly) 
{ 
    GtkWidget *wentrada; 
    wentrada = gtk_entry_new(); 
    gtk_grid_attach (GTK_GRID (wgrid), wentrada, x, y, lx, ly); 
} 

void boton(string texto, int x, int y, int lx, int ly) 
{ 
    const char * wtexto = texto.c_str(); 

    GtkWidget *wboton; 
    wboton = gtk_button_new_with_label (wtexto); 
    gtk_grid_attach (GTK_GRID (wgrid), wboton, x, y, lx, ly); 

    g_signal_connect (wboton, "clicked", G_CALLBACK (boton_clic), wentrada); 
} 

//MAIN 

int main(int argc, char *argv[]) 
{ 
    gtk_init (&argc, &argv); 

    ventana("ventana",10); 
    grid(); 
    entrada(1, 1, 1, 1); 
    boton("Aprietame", 1, 2, 1, 1); 

    gtk_widget_show_all (wventana); 
    gtk_main(); 

    return 0; 
}

但是当我尝试编译它，它表明：

In file included from /usr/include/glib-2.0/gobject/gobject.h:28:0, 
       from /usr/include/glib-2.0/gobject/gbinding.h:29, 
       from /usr/include/glib-2.0/glib-object.h:23, 
       from /usr/include/glib-2.0/gio/gioenums.h:28, 
       from /usr/include/glib-2.0/gio/giotypes.h:28, 
       from /usr/include/glib-2.0/gio/gio.h:26, 
       from /usr/include/gtk-3.0/gdk/gdkapplaunchcontext.h:28, 
       from /usr/include/gtk-3.0/gdk/gdk.h:32, 
       from /usr/include/gtk-3.0/gtk/gtk.h:30, 
       from boton.cpp:2: 
boton.cpp: In function ‘void boton(std::string, int, int, int, int)’: 
boton.cpp:51:64: error: ‘wentrada’ was not declared in this scope 
    g_signal_connect (wboton, "clicked", G_CALLBACK (boton_clic), wentrada); 
                   ^
/usr/include/glib-2.0/gobject/gsignal.h:472:73: note: in definition of macro  ‘g_signal_connect’ 
    g_signal_connect_data ((instance), (detailed_signal), (c_handler), (data), NULL,  (GConnectFlags) 0) 
                      ^
Compilation failed.

有什么不对？我该怎么办？？？

请您再解释一下第二个参数吗？（英语不是我的母语，这部分对我来说有点令人困惑：P）

再次感谢。

来源

2014-08-28 Ffff

boton_clic信号处理程序有两个参数：GtkWidget *和指向您指定的某些用户数据的指针。第一个参数始终是发送信号的对象，因此是wboton;但是您标记了参数wentrada，并将其视为GtkEntry *，因此显示错误消息。

第二个参数是连接信号时指定的用户数据。在您的g_signal_connect()致电中，您在此处通过wventana。但是如果您想访问信号处理程序中的条目，则应该改为wentrada。

因此，它应该是这样的：

void boton_clic (GtkButton *wboton, GtkEntry *wentrada) 
{ 
    const char *nombre; 
    nombre = gtk_entry_get_text (wentrada); 
    cout << nombre << endl; 
} 

... 

g_signal_connect (wboton, "clicked", G_CALLBACK (boton_clic), wentrada);

来源

2014-08-28 15:39:50 ptomato

gtk_entry_get_text：assertion'GTK_IS_ENTRY（entry）'failed

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