EGD_GET_NUMCH(3)

✨ EGD_GET_NUMCH ✨

okay bestie, so this is a page from the EEGDEV library manual (manual section 3, the library-call girlies 💅) and it's literally all about counting channels. like, how many channels of a given sensor type is your device actually sampling? that's the whole vibe. let's get into it 🎀

🌸 NAME 🌸

egd_get_numch — get the number of channels sampled by type 💖

🦋 SYNOPSIS 🦋

#include <eegdev.h>

int egd_get_numch(const struct eegdev* dev, int stype);

✨ DESCRIPTION ✨

so egd_get_numch() hands you back the number of channels of type stype that are being sampled by the recording device that dev points at. no cap, that's it, that's the function 🫶

and like, important detail: stype has to be one of the values that egd_sensor_type(3) gives you. don't just freestyle a random int in there, okay? 👑

💖 RETURN VALUE 💖

on a successful slay, the function returns a non-negative value — that's your number of channels of type stype. and yes, it can legitimately be 0, because sometimes a device just doesn't sample that type of data at all and that's valid of it 🙈

but if things go wrong? it returns -1 and sets errno accordingly. classic. 💀

😭 ERRORS 😭

egd_get_numch() will fail if:

• EINVAL — dev is NULL, or stype is not a valid value. literally the two ways to break it, bestie.

👑 SEE ALSO 👑

• egd_get_cap(3)
• egd_sensor_type(3)

and that's the whole page, no notes 💜 this icon was brought to you by EPFL, dated 2011, and it lives in the EEGDEV library manual — go count some channels, you've got this 🌈⭐🎀