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

Posted on 2004-09-02

1 solution

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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 :
}
}

Comment

Question by:jimdgar

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2 Comments

LVL 11

Accepted Solution

by:griessh

griessh earned 500 total points

ID: 119668342004-09-02

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

Author Comment

by:jimdgar

ID: 119679902004-09-02

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

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