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From: kit@EXPO.LCS.MIT.EDU (Chris D. Peterson)
Newsgroups: comp.windows.x
Subject: Re: floats and XtSetArg
Message-ID: <9007021441.AA14934@expo.lcs.mit.edu>
Date: 2 Jul 90 14:41:10 GMT
References: <9007021151.AA13264@expo.lcs.mit.edu>
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 30


> How can I use XtSetArg to send a float to my widget? 

Here is some code that sets the "shown" resource of the Athena Scrollbar widget.
This is in the Athena R4 widget documentation, for those of you who have it.

	top = 0.5;
	if (sizeof(float) > sizeof(XtArgVal)) {
	/*
	 * If a float is larger than an XtArgVal then pass this 
	 * resource value by reference.
	 */
		XtSetArg(args[0], XtNshown, &top);
	}
	else {
	/*
	 * Convince C not to perform an automatic conversion, which
	 * would truncate 0.5 to 0. 
	 */
		XtArgVal * l_top = (XtArgVal *) &top;
		XtSetArg(args[0], XtNshown, *l_top);
	}


						Chris D. Peterson     
						MIT X Consortium 

Net:	 kit@expo.lcs.mit.edu
Phone:   (617) 253 - 9608	
Address: MIT - Room NE43-213