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Ask the Wizard Questions

DECwindows: Access DISPLAY info

The Question is:

I am looking for a utility which can get me the characteristics
of the DECWINDOWsDISPLAY (i.e. transport mode) from a
program written in C or FORTRAN. The logical DECW$DISPLAY
does not give enough information. It is inconvenient to
use a DCL-procedure since that will not work when the program
has to be run in detached mode.


The Answer is:

//  The DECwindows IO$M_WS_DISPLAY I/O codes are neither documented
//  nor supported.

#define IO$M_WS_DISPLAY         64
#define DECW$C_WS_DSP_NODE       1
#define DECW$C_WS_DSP_SERVER     3
#define DECW$C_WS_DSP_SCREEN     4

#define RETBUFSIZ 80

    int RetStat;
    short IOChan;
    unsigned short int IOSB[2];
    short int RetLen;
    char RetBuf[RETBUFSIZ];

    RetStat = sys$assign( &DECwDevice, &IOChan, 0, 0 );
    if ( !$VMS_STATUS_SUCCESS( RetStat ))
	lib$signal( RetStat );

    RetStat = sys$qiow( 0, IOChan,
        IOSB, 0, 0, RetBuf, RETBUFSIZ - 1,
    if ( !$VMS_STATUS_SUCCESS( RetStat ))
	lib$signal( RetStat );
    if ( !$VMS_STATUS_SUCCESS( IOSB[0] ))
	lib$signal( IOSB[0] );

    RetLen = IOSB[2];
    printf( "Transport:  %*.*s\n", RetLen, RetLen, RetBuf );

    return SS$_NORMAL;