Measurement-computing Personal488 rev.3.0 For DOS & Windows 3.Xi Manual de usuario descargar pdf (Pagina 349)

15B. Driver488/SUB, W31, W95, & WNT III. COMMAND REFERENCES - 15. Command References

III-334 Personal488 User’s Manual, Rev. 3.0

OnEventVDM

Driver488/W95 (Console Mode Applications only)

SYNTAX

INT pascal OnEventVDM(DevHandleT devHandle, EventFuncT func);

devHandle

refers to either an interface or an external device.

func

is a user-specified interrupt-handler function that is to perform some

function, defined by the user, when one of the

Arm

ed conditions occur.

RETURNS

-1 if error

MODE

Any

SEE ALSO

OnEvent, Arm, Disarm

BUS STATES

None

EXAMPLE

qsk(x,Arm(ieee0, acSRQ));

qsk(x,OnEventVDM(ieee0, srqHandler));

Arm SRQ detection and set

up SRQ function handler

This function is new in Driver488/W95. The

OnEventVDM

(

VDM

refers to Virtual DOS Machine)

allows a call back to a user-specified function in a console mode application. The following is a full

example of a console mode program using the

OnEventVDM

function:

#include <windows.h>

#include <stdio.h>

#include “iotieee.h”

// For debugging

#define qsk(v,x) (v=x, printf(#x “ returned %d/n, v))

void

srqHandler(DevHandlerT devHandle, UINT mask)

{

LONG xfered;

printf(“\007\n\nEVENT-FUNCTION on %d mask 0x%04x\n”,devHandle,

mask);

qsk(xfered, Spoll(devHandle));

printf(“\n\n”);

}

void

main(void)

{

LONG result, xfered;

int ioStatus, x;

DevHandleT ieee0, wave14, wave16;

TermT myTerm;

UCHAR buffer[500];

printf(“\n\nSRQTEST program PID %d\n”,GetCurrentProcessId ());

qsk(ieee0, OpenName(“ieee0”));

qsk(wave14, OpenName(“Wave14”));

qsk(wave16, OpenName(“Wave16”));

qsk(result, Abort(wave14));

qsk(result, Abort(wave16));

qsk(x, Hello(ieee0, buffer));

printf(“\n%s\n\n”, buffer);

myTerm.EOI = 1;

myTerm.nChar = 0;

myTerm.termChar[0] = ‘\r’;

myTerm.termChar[1] = ‘\n’;

// Arm SRQ detection and set up SRQ function handler

qsk(x, Arm(ieee0, acSRQ));

qsk(x, OnEventVDM(ieee0, srqHandler));

// Tell the Wave to assert SRQ in 3 seconds

qsk(xfered,Output(wave16,“t3000x”,6L,1,0,&myTerm,0,&ioStatus));

printf(“Completion code: 0x%04x\n”, ioStatus);

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Measurement-computing Personal488 rev.3.0 For DOS & Windows 3.Xi Manual de usuario Pagina 349

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