GTK 在按钮按下时从多个小部件中检索值

Question

我正在尝试在按下按钮时从窗口中的条目字段和组合框中检索一个值。我目前正在努力这样做。有人告诉我，为了获得多个值，我需要使用结构。但是我正在努力让它发挥作用。这是我目前所拥有的：

按下按钮时运行的功能：

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

static void queue_hash (struct data *dataStruct) {

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

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

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

}

按钮：

GtkWidget *hashEntry;
GtkWidget *hashSelect;

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"); 


queueButtonBox = gtk_button_box_new(GTK_ORIENTATION_HORIZONTAL);
queueButton = gtk_button_new_with_label("Queue Hash");

gtk_fixed_put(GTK_FIXED(window_fixed), queueButtonBox, 300, 120);


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

当我运行代码时，我得到了这个错误：

(SDS-CW:16982): GLib-GObject-WARNING **: 14:42:38.659: invalid uninstantiatable type 'void' in cast to 'GtkEntry'

(SDS-CW:16982): Gtk-CRITICAL **: 14:42:38.659: gtk_entry_get_text: assertion 'GTK_IS_ENTRY (entry)' failed

任何帮助将不胜感激，谢谢。

Answer 1

manual 告诉我们"clicked" 信号的信号处理程序必须遵循这个签名：

void
user_function (GtkButton *button,
               gpointer   user_data)

您的函数只需要 1 个参数，并且对该信号无效。结果，您获取了button 指针并将其解释为您将失败的结构。

要解决此问题，请提供带有两个参数的签名，或者您可以将信号处理程序与函数 g_signal_connect_swapped 连接。

你可以像这样改变你的初始处理函数：

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

    struct data *dataStruct = user_data;

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

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

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