GTK 在按下按钮时从多个小部件中检索值

Question

我试图在按下按钮时从 window 中的 Entry 字段和 ComboBox 中检索值。我目前正在努力这样做。有人告诉我，为了获得多重价值，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：

按钮按下时运行的功能：

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

非常感谢任何帮助，谢谢。

Answer 1

manual 告诉我们 "clicked" 信号的信号处理程序必须遵循此签名：

void
user_function (GtkButton *button,
               gpointer   user_data)

您的函数只需要 1 个参数并且对于此信号无效。结果，您使用 button 指针并将其解释为将失败的结构。

要解决此问题，要么提供一个带有两个参数的签名，要么您可以将信号处理程序与函数 g_signal_connect_swapped.

连接起来

您可以像这样更改您的初始处理函数：

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);
}

GTK 在按下按钮时从多个小部件中检索值

GTK Retrieve values from multiple widgets on button press

c

gtk

parsing

button

gtk3