GTK-按下按钮即可从小部件中检索多个值

Question

这是我先前在这里提出的问题的跟进问题：GTK Retrieve values from multiple widgets on button press

我仍在尝试解决相同的问题，但是已根据上一个问题的回答实施了建议。

这是我的完整代码：

#include <gtk/gtk.h>

struct data {
    GtkEntry *hash;
    GtkWidget *hashType;
};

static void queue_hash (GtkButton *button, gpointer user_data) {

    struct data *dataStruct = user_data;

    GtkEntry *hashWid = dataStruct->hash;
    GtkWidget *hashTypeWid = dataStruct->hashType;

    const char* hash = gtk_entry_get_text(hashWid);
    char* hashType = gtk_combo_box_text_get_active_text(GTK_COMBO_BOX_TEXT(hashTypeWid));

    g_print ("Queue Hash: %s    %s\n", hash, hashType);
}


static void init(GtkApplication* app, gpointer user_data) {
    GtkWidget *window;
    GtkWidget *window_fixed;
    GtkWidget *nodeListBox;
    GtkWidget *hashListBox;
    GtkWidget *queueButtonBox;
    GtkWidget *queueButton;
    GtkWidget *hashEntry;
    GtkWidget *hashSelect;
    GtkWidget *remHashButton;
    GtkWidget *remHashButtonBox;
    GtkWidget *logBox;
    GtkWidget *nodesLabel;
    GtkWidget *hashLabel;

    window = gtk_application_window_new (app);
    gtk_window_set_title (GTK_WINDOW (window), "HashCrack Server");
    gtk_window_set_default_size (GTK_WINDOW (window), 1000, 435);
    gtk_window_set_resizable (GTK_WINDOW(window), FALSE);

    window_fixed = gtk_fixed_new();
    gtk_container_add(GTK_CONTAINER(window), window_fixed);

    queueButtonBox = gtk_button_box_new(GTK_ORIENTATION_HORIZONTAL);
    queueButton = gtk_button_new_with_label("Queue Hash");
    remHashButtonBox = gtk_button_box_new(GTK_ORIENTATION_HORIZONTAL);
    remHashButton = gtk_button_new_with_label("Remove Selected Hash");

    nodeListBox = gtk_list_box_new();
    gtk_widget_set_size_request(nodeListBox, 250, 365);
    hashListBox = gtk_list_box_new();
    gtk_widget_set_size_request(hashListBox, 250, 325);

    nodesLabel = gtk_label_new("Connected Nodes");
    gtk_label_set_markup(GTK_LABEL(nodesLabel), "<span font_desc=\"20.0\">Connected Nodes</span>");
    gtk_fixed_put(GTK_FIXED(window_fixed), nodesLabel, 40, 15);

    hashLabel = gtk_label_new("Connected Nodes");
    gtk_label_set_markup(GTK_LABEL(hashLabel), "<span font_desc=\"20.0\">Queued Hashes</span>");
    gtk_fixed_put(GTK_FIXED(window_fixed), hashLabel, 755, 15);

    hashEntry = gtk_entry_new();
    gtk_widget_set_size_request(hashEntry, 290, 33);
    gtk_fixed_put(GTK_FIXED(window_fixed), hashEntry, 300, 75);

    hashSelect = gtk_combo_box_text_new();
    gtk_widget_set_size_request(hashSelect, 102, 25);
    gtk_fixed_put(GTK_FIXED(window_fixed), hashSelect, 595, 75);
    gtk_combo_box_text_append_text(GTK_COMBO_BOX_TEXT(hashSelect), "MD5");
    gtk_combo_box_text_append_text(GTK_COMBO_BOX_TEXT(hashSelect), "SHA1");
    gtk_combo_box_text_append_text(GTK_COMBO_BOX_TEXT(hashSelect), "ROT16");
    gtk_combo_box_text_append_text(GTK_COMBO_BOX_TEXT(hashSelect), "###");

    gtk_widget_set_size_request(queueButtonBox, 390, 25);
    gtk_widget_set_size_request(queueButton, 390, 25);
    gtk_fixed_put(GTK_FIXED(window_fixed), queueButtonBox, 300, 120);

    struct data *cb_data = g_new0(struct data, 1);
    cb_data->hash = GTK_ENTRY(hashEntry);
    cb_data->hashType = hashSelect;
    g_signal_connect_swapped(queueButton, "clicked", G_CALLBACK (queue_hash), cb_data);

    logBox = gtk_text_view_new();
    gtk_widget_set_size_request(logBox, 400, 240);
    gtk_fixed_put(GTK_FIXED(window_fixed), logBox, 300, 175);

    gtk_widget_set_size_request(remHashButtonBox, 200, 25);
    gtk_widget_set_size_request(remHashButton, 200, 25);
    gtk_fixed_put(GTK_FIXED(window_fixed), remHashButtonBox, 750, 390);

    gtk_container_add(GTK_CONTAINER(queueButtonBox), queueButton);
    gtk_container_add(GTK_CONTAINER(remHashButtonBox), remHashButton);
    gtk_fixed_put(GTK_FIXED(window_fixed), nodeListBox, 25, 50);
    gtk_fixed_put(GTK_FIXED(window_fixed), hashListBox, 725, 50);

    gtk_widget_show_all(window);
}

int main(int argc, char **argv) {
    GtkApplication *app;
    int status;

    app = gtk_application_new ("com.sds.hashcrack", G_APPLICATION_FLAGS_NONE);
    g_signal_connect (app, "activate", G_CALLBACK (init), NULL);
    status = g_application_run (G_APPLICATION (app), argc, argv);
    g_object_unref (app);

    return status;
}

当我按下按钮尝试检索值时，出现此错误：

(SDS-CW:25413): Gtk-CRITICAL **: 19:18:19.125: gtk_entry_get_text: assertion 'GTK_IS_ENTRY (entry)' failed

非常感谢您的帮助，谢谢。

Answer 1

您误解了g_signal_connect_swapped的工作原理。

如果您提供的功能与手册中提供的签名相匹配，则不得使用g_signal_connect_swapped！请改用g_signal_connect。

如果由于某些原因必须使用其他函数，而该函数仅使用一个参数，该参数与定义的签名中的第二个参数匹配，（因为使用了某些库函数，则可以使用g_signal_connect_swapped。

在链接问题中，我的答案告诉您使用g_signal_connect_swapped修复签名或。两者都不是。

正确的组合是：

static void queue_hash (GtkButton *button, gpointer user_data) {

    struct data *dataStruct = user_data;
...
}

g_signal_connect(queueButton, "clicked", G_CALLBACK (queue_hash), cb_data);

或

static void queue_hash (struct data *dataStruct) {
...
}

g_signal_connect_swapped(queueButton, "clicked", G_CALLBACK (queue_hash), cb_data);

您可以通过在调试器中运行程序并在回调函数中查看cb_data中的init和button + user_data的地址来轻松地检测到这一点。在许多情况下，在调试器中运行程序通常是一个好主意。