如何解决使用g_timeout_add并更新GUI
我只是重新开始编程，需要一些帮助。我对GTK3完全陌生，并且不使用编码蜘蛛网。
我正在编写的程序基本上会读取每秒内出现的GPS GPGGA数据字符串的串行端口，解析数据并计算字符串之间的距离，并在达到用户输入距离并重复时触发输出。我在树莓派PI上用C编写，使用Glade制作了接口和Code :: Block IDE。
现在，我有时间g_timeout_add在工作，金达。如果我从gtk_label_set_text函数中删除了calc_display，它将每500毫秒运行并运行一次该函数（GPIO上有一个LED确认-删除代码以简化阅读）。但是GUI没有响应，也不会更新。
如果我在函数中具有gtk_label_set_text和gtk_main_iteration()，它将运行一次并冻结（更新显示时带GPS，但LED指示灯不闪烁）。我在这里搞砸了什么，我已经阅读了GTK参考资料，但没有发现任何问题，我怀疑这是一个新手愚蠢的错误。有什么想法吗？
代码如下：
#include <gtk/gtk.h>
#include <stdio.h>
#include <stdlib.h>
#include <wiringPi.h>
#include "serial_gps.h"
#include "pin_names.h"
#include "gps_distance.h"
typedef struct
{
GtkWidget *w_shot_spacing_ent; // generic pointer for entered text
GtkWidget *w_num_shots_val;
GtkWidget *w_gps_q_val;
GtkWidget *w_total_dist_val;
GtkWidget *w_avg_space_val;
GtkWidget *w_lat_val;
GtkWidget *w_long_val;
GtkWidget *w_pause_but;
GtkWidget *w_start_but;
GtkWidget *w_serial_in;
} app_widgets;
int start =0; // used in the "Start button clicked" function
int port_fd = 0; // file descriptor for the serial port
float spacing = 0; // global for the shor spacing value
gint input_type = 1; // for picking USB or DB9 serial
guint event_id = 0;
char port_data[100]; // big buffer for the port data
int toggle = FALSE;
void flash_leds(void);
void ini_data(void);
void calc_display(app_widgets *app_wdgts);
void calc_display_f(void);
int main (int argc,char *argv[])
{
GtkBuilder *builder;
GtkWidget *window;
// instantiate structure,allocating memory for it
app_widgets *widgets = g_slice_new(app_widgets);
wiringPiSetup(); // initialise the wiring Pi library
flash_leds();
ini_data(); // ini the data structure
gtk_init(&argc,&argv);
builder = gtk_builder_new_from_file ("glade/ShotMaster.glade");
window = GTK_WIDGET(gtk_builder_get_object (builder,"window_main"));
// get pointers to label widgets
widgets->w_shot_spacing_ent= GTK_WIDGET(gtk_builder_get_object(builder,"shot_spacing_ent"));
widgets->w_num_shots_val= GTK_WIDGET(gtk_builder_get_object(builder,"shot_num_val"));
widgets->w_total_dist_val= GTK_WIDGET(gtk_builder_get_object(builder,"total_dist_val"));
widgets->w_avg_space_val= GTK_WIDGET(gtk_builder_get_object(builder,"avg_space_val"));
widgets->w_gps_q_val= GTK_WIDGET(gtk_builder_get_object(builder,"gps_q_val"));
widgets->w_lat_val= GTK_WIDGET(gtk_builder_get_object(builder,"lat_val"));
widgets->w_long_val= GTK_WIDGET(gtk_builder_get_object(builder,"long_val"));
widgets->w_pause_but= GTK_WIDGET(gtk_builder_get_object(builder,"pause_but"));
widgets->w_start_but= GTK_WIDGET(gtk_builder_get_object(builder,"start_but"));
widgets->w_serial_in= GTK_WIDGET(gtk_builder_get_object(builder,"serial_in"));
gtk_builder_connect_signals(builder,widgets);
g_object_unref(builder);
gtk_widget_show(window);
gtk_main();
g_slice_free(app_widgets,widgets); // free up memory,usually done by OS,but good pratice
return 0;
}
void on_reset_but_clicked (GtkButton *button,app_widgets *app_wdgts)
{
// just some test code
gtk_label_set_text(GTK_LABEL (app_wdgts->w_num_shots_val),"3");
gtk_label_set_text(GTK_LABEL (app_wdgts->w_total_dist_val),"2");
gtk_label_set_text(GTK_LABEL (app_wdgts->w_avg_space_val),"1");
}
void calc_display(app_widgets *app_wdgts)
{
char buffer[20];
int num_buf;
double F_buff;
shot_trigger(); // this code works,has no GTK functions in it works with the "data" struct for collecting data
GString *temp = g_string_new("0000");
num_buf = data.num_shots;
F_buff = data.latitude;
F_buff = data.longitude;
sprintf(buffer,"%i",data.num_shots);
gtk_label_set_text(GTK_LABEL (app_wdgts->w_num_shots_val),buffer);
sprintf(buffer,data.gps_q);
gtk_label_set_text(GTK_LABEL (app_wdgts->w_gps_q_val),buffer );
sprintf(buffer,"%f",data.total_dist);
gtk_label_set_text(GTK_LABEL (app_wdgts->w_total_dist_val),data.avg_space);
gtk_label_set_text(GTK_LABEL (app_wdgts->w_avg_space_val),data.latitude);
gtk_label_set_text(GTK_LABEL (app_wdgts->w_lat_val),data.longitude);
gtk_label_set_text(GTK_LABEL (app_wdgts->w_long_val),buffer );
}
gtk_main_iteration(); // update the display
}
void on_start_but_clicked(GtkButton *button,app_widgets *app_wdgts) // Main function that starts serial data grabbing/ calculations
{
int port_err = 0;
data.spacing = gtk_spin_button_get_value(GTK_SPIN_BUTTON(app_wdgts->w_shot_spacing_ent));
input_type = gtk_combo_box_get_active(GTK_COMBO_BOX(app_wdgts->w_serial_in)); // returns a 0 for USB and 1 for DBc
port_fd = start_serial(input_type,9600); //open the port
flush_port(port_fd); // start with a clean buffer
port_err= get_serial_string(port_data,port_fd); // get a line of GPS data
data.run=TRUE;
if (port_err != 0)
{
// error found,-1 = buffer overflow
}
if(start == 0) // initial condition
{
event_id = g_timeout_add(500,(GSourceFunc) calc_display,app_wdgts);
start = 1;
gtk_button_set_label(button,"Change"); //once started you can only change things..
}
else // after program has Started,button in "Change" mode
{
spacing = gtk_spin_button_get_value(GTK_SPIN_BUTTON(app_wdgts->w_shot_spacing_ent)); // get new value
}
}
void on_pause_but_clicked (GtkButton *button,app_widgets *app_wdgts)
{
if(data.run == TRUE)
{
gtk_button_set_label(button,"RUN");// change button label
data.run = FALSE;
}
else
{
data.run = TRUE;
gtk_button_set_label(button,"PAUSE");// change button label
}
}
void on_quit_but_clicked(void)
{
stop_serial( port_fd); // close the serial port
gtk_main_quit();
}
void on_window_main_destroy(void)
{
stop_serial( port_fd); // close the serial port
gtk_main_quit();
}
void flash_leds(void)
{
pinMode(test_LED,OUTPUT); // set pin(s) to outputs
pinMode(trig_LED,OUTPUT); // set pin(s) to outputs
pinMode(gps_LED,OUTPUT); // set pin(s) to outputs
pinMode(error_LED,OUTPUT); // set pin(s) to outputs
digitalWrite(test_LED,HIGH); // high is LED off
digitalWrite(trig_LED,HIGH); // high is LED off
digitalWrite(gps_LED,HIGH); // high is LED off
digitalWrite(error_LED,HIGH); // high is LED off
digitalWrite(test_LED,LOW);
digitalWrite(trig_LED,LOW);
digitalWrite(gps_LED,LOW);
digitalWrite(error_LED,LOW);
delay(1000);
digitalWrite(test_LED,HIGH); // high is LED off
}
void ini_data(void)
{
data.spacing = 0;
data.num_shots =0;
data.gps_q = 0;
data.total_dist = 0;
data.avg_space = 0;
data.latitude = 0;
data.longitude = 0;
data.run = FALSE;
}
解决方法
好的，我的实现是正确的（或者足够正确，它可以工作）。我的错误是超时和从串行端口读取之间的某些时间冲突。只是让公众感到尴尬。。。我最初是用Python编写的，但后来改用C进行更快的计算，并坚持了一些假设....楔住屁股，然后就走了！
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