Hi,
sorry if i write a droll question, i´m realy new to this....
I have written a short testprogram which is reading from a messageQ.
The code is written in C.
If i get a message the printf with the much ***** is comming ok but afterwards
the program chrashes...
What is the problem with my code? Can somebody help me?
Patrick
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Multiline_Output.H>
#include <FL/Fl_Button.H>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/shm.h>
#include <time.h>
#include <unistd.h>
#include <string.h>
struct my_msgbuf
{
int mtype;
int mtext;
char message[50];
};
/* Hauptfenster */
Fl_Window *window;
/* Mehrzeiliger output */
Fl_Multiline_Output *output;
/* Button */
Fl_Button *button;
Fl_Button *button2;
void readmessage(Fl_Widget *,void *)
{
struct my_msgbuf buf;
int msqid;
key_t key;
key = 67890;
int counter = 0;
char text[100];
if ((msqid = msgget(key, 0644 | IPC_CREAT)) == -1)
{
perror("msgget");
exit(1);
}
printf("msqid = %i\n", msqid);
if (msgrcv(msqid, (struct msgbuf *)&buf, sizeof(buf), 0, 0) == -1)
{
perror("msgrcv");
}
else
{
counter++;
printf("********************************************************************\n");
printf("%05i Receive: mtype: %i, mtext: %i, message:
%s\n",counter, buf.mtype, buf.mtext, buf.message);
printf("********************************************************************\n");
// sprintf(text, "%05i Receive: mtype: %i, mtext: %i, message:
%s\n",counter, buf.mtype, buf.mtext, buf.message);
// output->value(text);
}
}
void cb_hallo(Fl_Widget *,void *)
{
output->value("Hallo");
}
int main(int argc, char **argv)
{
window = new Fl_Window(400,400);
button = new Fl_Button(100, 50, 200, 50, "MessageQ");
button->callback(readmessage);
button2 = new Fl_Button(100, 120, 200, 50, "Hallo");
button2->callback(cb_hallo);
output = new Fl_Multiline_Output(100,200,200,100,"Textoutput");
output->align(FL_ALIGN_BOTTOM);
window->show(argc,argv);
return Fl::run();
}
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