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/*
PsychSourceGL/Source/Common/Eyelink/EyelinkReadFromTracker.c
PLATFORMS: All
PROJECTS: Eyelink
AUTHORS:
nuha@sr-research.com nj
HISTORY:
11-03-09 nj created
*/
#include "PsychEyelink.h"
static char useString[] = "[result, reply] = Eyelink('ReadFromTracker', VariableName);";
static char synopsisString[] =
"Sends a text variable 'VariableName' name whose value is to be read and returned by the tracker as a text string.\n"
"Returns text with reply to last read request.\n";
static char seeAlsoString[] = "";
/*
ROUTINE: EyelinkReadFromTracker
PURPOSE:
Sends a text variable name whose value is to be read and returned by the tracker as a text string.
Returns text with reply to last read request. */
PsychError EyelinkReadFromTracker(void)
{
int result;
char *varbuf;
char replybuf[100] = "";
int t;
//all sub functions should have these two lines
PsychPushHelp(useString, synopsisString, seeAlsoString);
if(PsychIsGiveHelp()){PsychGiveHelp();return(PsychError_none);};
//check to see if the user supplied superfluous arguments
PsychErrorExit(PsychCapNumInputArgs(1));
PsychErrorExit(PsychRequireNumInputArgs(1));
PsychErrorExit(PsychCapNumOutputArgs(2));
// Verify eyelink is up and running
EyelinkSystemIsConnected();
EyelinkSystemIsInitialized();
PsychAllocInCharArg(1, TRUE, &varbuf);
result = eyelink_read_request(varbuf);
if (!result){
t = current_msec();
// Waits for a maximum of 500 msec
while(current_msec()-t < 500)
{
if(eyelink_read_reply(replybuf) == OK_RESULT)
{
break;
}
// OS friendly wait for at least 1 msec before retry:
PsychYieldIntervalSeconds(0.001);
}
}
PsychCopyOutDoubleArg(1, TRUE, result);
PsychCopyOutCharArg(2, TRUE, replybuf);
return(PsychError_none);
}
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