当我尝试将文本从文件加载到TextView时,我正在学习GTK +库,但遇到了一些问题。

// main.cpp
GtkWidget *textInput;
GtkTextBuffer *textBuffer;
[...]
//Create text input field
textInput = gtk_text_view_new();
gtk_box_pack_start(GTK_BOX (vbox), textInput, 1, 1, 0);
textBuffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW (textInput));

// Menu actions
g_signal_connect(G_OBJECT(openFile), "activate", G_CALLBACK(showOpenFileDialog), textBuffer);


当我尝试更改main.cpp中的textBuffer时,一切顺利。但...

void showOpenFileDialog(GtkTextBuffer *buffer)
{
GtkWidget *openFileDialog;
openFileDialog = gtk_file_chooser_dialog_new("Open file", GTK_WINDOW(NULL), GTK_FILE_CHOOSER_ACTION_OPEN,GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL, GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT, NULL);
gtk_dialog_run(GTK_DIALOG(openFileDialog));

const gchar *filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(openFileDialog));

ifstream file(filename);
string line;
if(file.is_open())
{
    while(getline(file, line))
    {
        GtkTextIter endOfTextInput;
        gtk_text_buffer_get_end_iter(buffer, &endOfTextInput);
        gtk_text_buffer_insert(buffer, &endOfTextInput, line.c_str(), line.size());
    }
}

gtk_widget_destroy(openFileDialog);
}


从文件加载每一行后,GTK都会将运行时错误输出到控制台:

(asdddd.exe:3872): Gtk-CRITICAL **: gtk_text_buffer_get_end_iter: assertion `GTK
_IS_TEXT_BUFFER (buffer)' failed

(asdddd.exe:3872): Gtk-CRITICAL **: gtk_text_buffer_insert: assertion `GTK_IS_TE
XT_BUFFER (buffer)' failed


我尝试这样做:

GTK_TEXT_BUFFER(buffer)


但这给了我另一个错误

(asdddd.exe:3872): GLib-GObject-WARNING **: invalid cast from `GtkMenuItem' to `
GtkTextBuffer'


谁能帮我?

最佳答案

GtkMenuItem :: activate的签名为

void signalHandler(GtkMenuItem *sender, gpointer user_data);


您的信号处理程序(在本例中为showOpenFileDialog())必须具有此签名。在您的情况下,您正在将文本缓冲区正确传递到g_signal_connect()行,但是该行已分配给了user_data参数(GtkMenuItem本身,在本例中为openFile,是sender)。

不幸的是,不能对GObject信号进行静态类型检查。我不知道是否存在可以提供帮助的静态分析工具。

关于c++ - GTK + 3.0 C++将GtkTextBuffer传递给函数,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/26702751/

10-11 23:08
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