Volume 6A: Motif Programming Manual

The C string "A Label" (which is 7 chars long, plus 1 NULL byte) is automatically converted into a compound

string by the toolkit using a pre−installed type converter. This method can also be used to change the label for a

widget using XtVaSetValues().

Since compound strings are dynamically created and destroyed, you cannot statically declare an argument list that

contains a pointer to a compound string. For example, it would be an error to do the following:

static Arg list[] = {

...

XmNlabelString, XmStringCreateLocalized ("A label"),

...

};

label = XtCreateManagedWidget ("name",

xmLabelWidgetClass, parent,

list, XtNumber (list));

This technique causes an error because you cannot create a compound string in a statically declared array. For a

complete discussion of compound strings, see Chapter 19, Compound Strings.

12.1.3 Images as Labels

A Label widget or gadget can display an image instead of text by setting the XmNlabelType resource to

XmPIXMAP. As a result of this resource setting, the Label displays the -pixmap specified for the XmNlabelPixmap

resource. the source code demonstrates how pixmaps can be used as labels. XtSetLanguageProc() is only

available in X11R5; there is no corresponding function in X11R4.

/* pixmaps.c −− Demonstrate simple label gadgets in a row column.

* Each command line argument represents a bitmap filename. Try

* to load the corresponding pixmap and store in a RowColumn.

*/

#include <Xm/LabelG.h>

#include <Xm/RowColumn.h>

main(argc, argv)

int argc;

char *argv[]; ...