Measurement Computing Personal488 rev.3.0 - Manual (Page 103)

Personal488 for Windows 95/98/Me/NT/2000 04-10-01 API Reference 6-35
OnEventVDM
Windows9x and Windows2000 Only !
Syntax INT WINAPI 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 user-defined
function, when one of the Arm ed conditions occur.
Returns -1 if error
Bus States None
Example Arm(ieee0, acSRQ);
OnEventVDM(ieee0, srqHandler);
Arms SRQ detection and sets up SRQ
function handler
See Also OnEvent, Arm, Disarm
This function is new in Driver488/W95. The OnEventVDM allows a call back to a user-specified function
in an application. The following is a full example of a console mode program using the OnEventVDM
function:
#include
#include
#include “iotieee.h”
// For debugging
#define qsk(v,x) (v=x, printf(#x “returned %d\n”, v))
void srqHandler(DevHandleT 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);
// Normally, your program would be off doing other work, for
// this example we will just hold here for a short time.
For(result = 0; result 30000; result++) {
printf(“Result is %06d\r”, result);