?
Solved

Is XtAppAddWorkProc the proper way to launch a Popup at startup?  Getting crashes...

Posted on 2004-09-02
2
1 solution
Medium Priority
?
539 Views
Last Modified: 2010-05-18
When my app starts it reads a user config file and based on the contents of that file may need to launch a dialog to get user inputs before proceeding.  In Java I can run initialization blocks which include dialogs prior to launching the main window GUI with .show().  How can I do this in Motif?  I tried using XtAppAddWorkProc as in the following code, but what I get is a dialog which pops up and disappears without even waiting for a user response.  (All this code runs OK when I don't use the WorkProc).

Widget toplevel;

main (int argc, char *argv[])
{
  XtAppContext app;
  Widget main_window;

  XtSetLanguageProc (NULL, NULL, NULL);
  toplevel = XtVaAppInitialize (&app, "App", NULL, 0, &argc, argv, NULL,
              XmNtitle,    "...",
              NULL);
  main_window = XtVaCreateManagedWidget ("main_window",
               xmMainWindowWidgetClass, toplevel,
               NULL);

    create_menu_bar (main_window);
    create_forms (main_window);
 
    XtRealizeWidget (toplevel);

    XtAppAddWorkProc (app, run_startup, (XtPointer) toplevel);

    XtAppMainLoop (app);
}

static Boolean run_startup (XtPointer client_data)
{
  static done=false;
  Widget dialog;

  if (!done) {
      dialog = XmCreateQuestionDialog (toplevel, "notice", NULL, 0);
      XtVaSetValues (dialog,
                 XmNdialogTitle, XmStringCreateLocalized ("Response"),
                 XmNmessageString, XmStringCreateLocalized ("Question to user"),
                 XmNokLabelString, XmStringCreateLocalized ("Yes"),
                 XmNcancelLabelString, XmStringCreateLocalized ("No"),
                 NULL);
      XtAddCallback (dialog, XmNokCallback, question_cb, NULL);
      XtAddCallback (dialog, XmNcancelCallback, question_cb, NULL);
      XtUnmanageChild (XmMessageBoxGetChild (dialog, XmDIALOG_HELP_BUTTON));
      XtManageChild (dialog);
      XtPopup (XtParent (dialog), XtGrabNone);
  }
  done=true;

  return True;
}

void question_cb (Widget parent, XtPointer client_data, XtPointer call_data)
{
    XmAnyCallbackStruct *cbs = (XmAnyCallbackStruct *) call_data;

     switch (cbs->reason) {
    case XmCR_OK :
      strcpy (Ans,"Y");
      break;
    case XmCR_CANCEL :
      strcpy (Ans,"N");
      XtPopdown (XtParent (parent));
      break;
    case XmCR_ACTIVATE :
      break;
    case XmCR_HELP :
    }
}
0
Comment
Question by:jimdgar
2 Comments
 
LVL 11

Accepted Solution

by:
griessh earned 2000 total points
ID: 11966834
Hi jimdgar,

No need to use a workproc, they are just ugly beasts sunning in the background. Just run you program like this

#include <Xm/Xm.h>
#include <Xm/MainW.h>
#include <Xm/RowColumn.h>
#include <Xm/MessageB.h>

Widget toplevel;
void question_cb (Widget parent, XtPointer client_data, XtPointer call_data);

main (int argc, char *argv[])
{
  XtAppContext app;
  Widget main_window;

  XtSetLanguageProc (NULL, NULL, NULL);
  toplevel = XtVaAppInitialize (&app, "App", NULL, 0, &argc, argv, NULL,
            XmNtitle,    "...",
            NULL);
  main_window = XtVaCreateManagedWidget ("main_window",
             xmMainWindowWidgetClass, toplevel,
             NULL);

//    create_menu_bar (main_window);
//    create_forms (main_window);

    XtRealizeWidget (toplevel);


    Widget dialog = XmCreateQuestionDialog (toplevel, "notice", NULL, 0);
    XtVaSetValues (dialog,
               XmNdialogTitle, XmStringCreateLocalized ("Response"),
               XmNmessageString, XmStringCreateLocalized ("Question to user"),
               XmNokLabelString, XmStringCreateLocalized ("Yes"),
               XmNcancelLabelString, XmStringCreateLocalized ("No"),
               NULL);
    XtAddCallback (dialog, XmNokCallback, question_cb, NULL);
    XtAddCallback (dialog, XmNcancelCallback, question_cb, NULL);
    XtUnmanageChild (XmMessageBoxGetChild (dialog, XmDIALOG_HELP_BUTTON));
    XtManageChild (dialog);
    XtPopup (XtParent (dialog), XtGrabNone);

    XtAppMainLoop (app);
}


void question_cb (Widget parent, XtPointer client_data, XtPointer call_data)
{
    XmAnyCallbackStruct *cbs = (XmAnyCallbackStruct *) call_data;

    switch (cbs->reason) {
    case XmCR_OK :
//      strcpy (Ans,"Y");
      break;
    case XmCR_CANCEL :
//      strcpy (Ans,"N");
      XtPopdown (XtParent (parent));
      break;
    case XmCR_ACTIVATE :
      break;
    case XmCR_HELP :
      break;
    }
}


======
Werner
0
 

Author Comment

by:jimdgar
ID: 11967990
I tried that method previously and it didn't work, but now that I try your short example it's OK.  Obviously something else is wrong with my full code.

Thanks
0

Featured Post

What Kind of Coding Program is Right for You?

There are many ways to learn to code these days. From coding bootcamps like Flatiron School to online courses to totally free beginner resources. The best way to learn to code depends on many factors, but the most important one is you. See what course is best for you.

Take the quiz
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

If You Don't Need Interface Builder.
Article by: pgnatyuk
Preface I don't like visual development tools that are supposed to write a program for me. Even if it is Xcode and I can use Interface Builder. Yes, it is a perfect tool and has helped me a lot, mainly, in the beginning, when my programs were small…
Pointer Arithmetic and Function Pointer.
Article by: Subrat
Summary: This tutorial covers some basics of pointer, pointer arithmetic and function pointer. What is a pointer: A pointer is a variable which holds an address. This address might be address of another variable/address of devices/address of fu…
Basic File Writing in C
Video by: Grant
The goal of this video is to provide viewers with basic examples to understand opening and writing to files in the C programming language.
Basic Recursion in C
Video by: Grant
The goal of this video is to provide viewers with basic examples to understand recursion in the C programming language.
Advertise Here

568 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Advertise Here