Conference bulova::decw_jan-89_to_nov-90

1419.0. "XT$APP_CREATE_SHELL ???" by EWBV37::HIME (I hate you FORTRAN !!) Mon Sep 11 1989 21:08

  I have a customer who is tring to use the XT$APP_CREATE_SHELL with FORTRAN
  and he is getting an ACCVIO. 

  I found out some informations about this problem in the QAR list.
  But it does not clear up the problem.

  Is this a known bug or restriction ?

  The following program reproduces his problem.
  Is there any mistakes in my program ?
  Could any one please let me know how to call it from FORTRAN ?
  
  -Toru.

$ run SAMPLE1

%SYSTEM-F-ACCVIO, access violation, reason mask=01, virtual address=5A1490D6, P
C
=000F94AA, PSL=03C00000
%TRACE-F-TRACEBACK, symbolic stack dump follows
module name     routine name                     line       rel PC    abs PC

                                                           000F94AA  000F94AA
                                                           000F970E  000F970E
                                                           000FEC6D  000FEC6D
                                                           000FF079  000FF079
                                                           000DA5A8  000DA5A8
SAMPLE1         SAMPLE1                         14154      000000B3  00000EB3



	PROGRAM SAMPLE1

	IMPLICIT	NONE
	INCLUDE		'($DSCDEF)'
	INCLUDE		'SYS$LIBRARY:DECW$DWTDEF'
	INCLUDE		'SYS$LIBRARY:DECW$XLIBDEF'

	STRUCTURE	/DESCRIPTOR/
	   INTEGER*2	LENGTH
	   BYTE		DTYPE
	   BYTE		CLASS
	   INTEGER*4	POINTER
	END STRUCTURE

	RECORD		/DESCRIPTOR/ HIERARCHY_FILE_DESCR
	CHARACTER*(*)	HIERARCHY_FILE_NAME
	PARAMETER	(HIERARCHY_FILE_NAME='T.UID')
	INTEGER*4	DB_FILENAME_VEC(0:0)
	INTEGER*4	DB_FILENAME_NUM /1/
	INTEGER*4	s_DRMHierarchy
	INTEGER*4	DUMMY_CLASS

	EXTERNAL	ACTIVATE_PROC
	EXTERNAL	CREATE_PROC
	EXTERNAL	APPLICATIONSHELLWIDGETCLASS

	CHARACTER*(*)	ACTIVATE_PROC_N
	PARAMETER	(ACTIVATE_PROC_N = 'activate_proc'//CHAR(0))
	CHARACTER*(*)	CREATE_PROC_N                     
	PARAMETER	(CREATE_PROC_N = 'create_proc'//CHAR(0))

	RECORD		/DWT$DRMREG_ARG/ REGLIST(0:1)
	INTEGER*4	REGLIST_NUM /2/

	INTEGER*4	TOPLEVEL,MIDDLE
	INTEGER*4	COMMAND_WINDOW,MAIN_WINDOW
	INTEGER*4	ARGC /0/
	INTEGER*4	HIERARCHY_STATUS
	INTEGER*4	REGISTER_STATUS
	INTEGER*4	FETCH_STATUS
	INTEGER*4	LSTATUS
	INTEGER*4	APP_CONTEXT 
	INTEGER*4	DISPLAY,disp
	INTEGER*4	COUNT
!
	RECORD		/DWT$ARG/ ARGLIST(0:1)
!                                        
	HIERARCHY_FILE_DESCR.LENGTH = LEN(HIERARCHY_FILE_NAME)
	HIERARCHY_FILE_DESCR.DTYPE = DSC$K_DTYPE_T
	HIERARCHY_FILE_DESCR.CLASS = DSC$K_CLASS_S
	HIERARCHY_FILE_DESCR.POINTER = %LOC(HIERARCHY_FILE_NAME)
	DB_FILENAME_VEC(0) = %LOC(HIERARCHY_FILE_DESCR)

	REGLIST(0).DWT$A_DRMR_NAME = %LOC(ACTIVATE_PROC_N)
	REGLIST(0).DWT$L_DRMR_VALUE = %LOC(ACTIVATE_PROC)
	REGLIST(1).DWT$A_DRMR_NAME = %LOC(CREATE_PROC_N)
	REGLIST(1).DWT$L_DRMR_VALUE = %LOC(CREATE_PROC)

	CALL DWT$INITIALIZE_DRM
	CALL XT$TOOLKIT_INITIALIZE()
	APP_CONTEXT = XT$CREATE_APPLICATION_CONTEXT()
	DISPLAY = XT$OPEN_DISPLAY(APP_CONTEXT,'EWBV37::0.0',
     *                            'TEST',
     *                            'TEST',
     *                            ARGLIST,0,
     *                            ARGC,%VAL(0))
	CALL	DWT$VMS_SET_ARG (
     *                           100,
     *                           ARGLIST,
     *                           0,
     *                           DWT$C_NX)
	CALL	DWT$VMS_SET_ARG (
     *                           100,
     *                           ARGLIST,
     *                           1,
     *                           DWT$C_NY)
	TOPLEVEL = XT$APP_CREATE_SHELL('TEST',
     *                                 'TEST',
     *                       APPLICATIONSHELLWIDGETCLASS,
     *                                  DISPLAY,
     *                                  ARGLIST,2)
                               
	HIERARCHY_STATUS = DWT$OPEN_HIERARCHY(
     *                           DB_FILENAME_NUM,
     *                           DB_FILENAME_VEC,
     *                           %VAL(0),
     *                           s_DRMHierarchy)
	IF (HIERARCHY_STATUS .NE. DWT$C_DRM_SUCCESS) THEN
	   TYPE *,'Can''t open hierarchy, status=',HIERARCHY_STATUS
	   STOP
	END IF

	REGISTER_STATUS = DWT$REGISTER_DRM_NAMES(
     *                           REGLIST,
     *                           REGLIST_NUM)
	IF (REGISTER_STATUS .NE. DWT$C_DRM_SUCCESS) THEN
	   TYPE *,'Can''t register callback, status=',REGISTER_STATUS
	   STOP
	END IF

	FETCH_STATUS = DWT$FETCH_WIDGET(
     *                           %VAL(s_DRMHierarchy),
     *                           'main',
     *                           TOPLEVEL,
     *                           MAIN_WINDOW,
     *                           DUMMY_CLASS)
	IF (FETCH_STATUS .NE. DWT$C_DRM_SUCCESS) THEN
	   TYPE *,'Can''t fetch MAIN WINDOW, status=',FETCH_STATUS
	   STOP
	END IF
	CALL XT$MANAGE_CHILD(MAIN_WINDOW)
	CALL XT$REALIZE_WIDGET(TOPLEVEL)
	CALL XT$APP_MAIN_LOOP(APP_CONTEXT)
	END

!---------------------------------------------------------------------------
!
!
	SUBROUTINE	ACTIVATE_PROC(W,TAG,REASON)
	CALL SYS$EXIT(%VAL(1))
	RETURN
	END

	SUBROUTINE	CREATE_PROC(W,TAG,REASON)
	RETURN
	END


module sample1                
	version = 'v1.0'
	names = case_sensitive

include file 'decw$include:DwtAppl.uil';

value
	popup : compound_string('popup!!');
procedure
	create_proc (integer);
	activate_proc (integer);

object
	main : dialog_box {
		arguments {
			width = 100;
			height = 100;
		};
		controls {
			push_button b1;
!			popup_dialog_box command_box;
		};
	};
	b1 : push_button {
		arguments {
			label_label = popup;
		}; 
		callbacks {
			activate = procedure activate_proc(1);
		};
	};
!	command_box : popup_dialog_box {
	command_box : dialog_box {
		arguments {
			x = 100;
			y = 100;
			width = 700;
			height = 100;
!			style = DwtModal;
!			style = DwtModeless;
		};
		callbacks {
			create = procedure create_proc(1);
		};
	};
end module;
                                                      

I tried this under VMS X5.3 (DECwindows V2), and get somewhat different
errors.  The first problem I see is that APP_CONTEXT needs to be passed
by immediate value to XT$OPEN_DISPLAY and, I think, XT$APP_MAIN_LOOP.
This is an error in the documentation (and VAX bindings).

However, when I make these changes, I then get the error:

X Toolkit Error: Error in XMultiplexInput
%DWT-F-DWTABORT, xtoolkit fatal error

I don't know how to proceed.  I can tell you that I see no evidence that
your code for calling XT$APP_CREATE_SHELL has any problems, as the program
gets all the way to the main loop before the error.

If someone can point me at a working example of this nature in some other
language, I can compare to see what is different.  Please understand that
it is not FORTRAN that is the problem, but the DECwindows VAX bindings and
their documentation.

				Steve

  I had the same problems with Ada.  I ended up importing the MIT C Binding
of XtAppCreateShell and it worked fine.

  I haven't tried XtAppMainLoop yet.  I got the error 'MultiplexInput' when
I used XtMainLoop and then realized that I needed to use XtAppNextEvent and
then XtDispatchEvent.  I used these since I multi-threaded the toolkit.

					-=> Jim <=-

  I wrote an example program multi-threading the toolkit.  It is written in
Ada and it is note 255.* in the DW_EXAMPLES conference.

  Check it out...

					-=> Jim <=-

Which node is the DW_EXAMPLES on 

>Ada and it is note 255.* in the DW_EXAMPLES conference.

	Stephen

ELKTRA::DW_EXAMPLES...  Press KP7 or select

    Note 321 in DW_EXAMPLES contains a complete PASCAL example using the
    VMS bindings.