Volume 6A: Motif Programming Manual

if (status != MrmSUCCESS)

error ("Unable to open hello_world.uid file.");

status = MrmRegisterNames (callback_list, XtNumber (callback_list));

if (status != MrmSUCCESS)

error ("Unable to register callback functions with Mrm.");

status = MrmFetchWidget (hierarchy, /* hierarchy to search */

"hello_main", /* object name */

toplevel, /* parent */

&hello_main, /* widget created */

&class_code); /* widget's class code */

if (status != MrmSUCCESS)

error ("Unable to create interface from UID file");

MrmCloseHierarchy (hierarchy);

XtManageChild (hello_main);

XtRealizeWidget (toplevel);

XtAppMainLoop (app_context);

}

Compiling this program is similar to any other Motif application−−we just need to add the Mrm library to the link

line. Because the program consists of a single file, we can use the following command to compile it on most UNIX

systems:

cc −o hello_world hello_world.c −lMrm −lXm −lXt −lX11

You should note that this program, like any program that uses Mrm, includes the file <Mrm/MrmAppl.h>. This file

contains the function prototypes and constant definitions necessary to use Mrm. It also includes the <Xm/Xm.h> file,

which contains the necessary declarations and definitions for the Motif library. When you use Mrm, there's no need to

include a header file for each type of widget in the interface because the interface is not created directly in C.

However, if your application uses any widget convenience functions, you do need to include the appropriate widget

header file(s).

23.5.1 Initializing ...