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/*
PsychToolbox3/Source/Common/PsychHID/PsychHIDGetNumElements.c
PROJECTS: PsychHID only.
PLATFORMS: Only OS X so far.
AUTHORS:
Allen.Ingling@nyu.edu awi
HISTORY:
4/29/03 awi Created.
TO DO:
*/
#include "PsychHID.h"
#if PSYCH_SYSTEM == PSYCH_OSX
static char useString[]= "numberOfElements=PsychHID('NumElements', deviceNumber)";
static char synopsisString[] =
"Return the the number of elements on the specified USB HID device.";
static char seeAlsoString[] = "";
PsychError PSYCHHIDGetNumElements(void)
{
int deviceIndex;
UInt32 numElements;
pRecDevice deviceRecord;
PsychPushHelp(useString, synopsisString, seeAlsoString);
if(PsychIsGiveHelp()){PsychGiveHelp();return(PsychError_none);};
PsychErrorExit(PsychCapNumOutputArgs(1));
PsychErrorExit(PsychCapNumInputArgs(1));
PsychCopyInIntegerArg(1, TRUE, &deviceIndex);
PsychHIDVerifyInit();
deviceRecord= PsychHIDGetDeviceRecordPtrFromIndex(deviceIndex);
numElements=HIDCountDeviceElements(deviceRecord, kHIDElementTypeIO);
PsychCopyOutDoubleArg(1, FALSE, (double)numElements);
return(PsychError_none);
}
#endif
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