Path: utzoo!attcan!utgpu!news-server.csri.toronto.edu!rutgers!usc!jarthur!uunet!mstan!jordan
From: jordan@Morgan.COM (Jordan Hayes)
Newsgroups: comp.windows.x
Subject: Re: A yes/no dialog (or synchronous operations)
Message-ID: <2245@s6.Morgan.COM>
Date: 21 Nov 90 22:56:36 GMT
References: <1990Nov19.050221.20537@ncsuvx.ncsu.edu>
Organization: Morgan Stanley, & Co., Inc. / New York City, NY
Lines: 58

George Browning <george@hobbes.catt.ncsu.edu> writes:

	Is the following possible?

	    void mycode()
	    {
	        if (Confirm("Do you wish to exit the program?"))
	            exit(0);
	    }
	
	    where Confirm() displays a yes/no dialog with the question and
	    sends a Boolean back.

Here's what I do in Motif; your mileage may vary:

-----

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

void
Confirm(p, str, yesFunc, noFunc, acb)
	Widget		p;
	String		str;
	VPF		yesFunc;
	VPF		noFunc;
	XtPointer	acb;
{
	Widget		mb;
	XmString	msg;

	msg = XmStringCreateLtoR(str, XmSTRING_DEFAULT_CHARSET);

	FIRSTARG(XmNmessageString, msg)
	NEWARG(XmNdeleteResponse, XmDESTROY)
	mb = XmCreateWarningDialog(p, "confirm", sArgs, ArgIndex);
	XmStringFree(msg);

	if (yesFunc)
		XtAddCallback(mb, XmNokCallback, yesFunc, acb);

	if (noFunc)
		XtAddCallback(mb, XmNcancelCallback, noFunc, acb);

	XtManageChild(mb);
}

-----

Then I can say:

SafeExit(top)
	Widget	top;
{
	Confirm(top, "Do you really want to exit?", exit, NULL, NULL);
}

/jordan