User data for mpr_sig_new

[Mathias Bredholt]

Hi all,

I'm using the new API and I'm trying to attach a user data pointer to a newly created signal for usage in the update handler. In the old API we had the user_data argument.

         

mapper_signal mapper_device_add_signal	(	mapper_device	dev,
		mapper_direction	dir,
		int	num_instances,
		const char *	name,
		int	length,
		char	type,
		const char *	unit,
		const void *	minimum,
		const void *	maximum,
		mapper_signal_update_handler *	handler,
		const void *	user_data
	)

In the new API it's not there.

mpr_sig_new(mpr_dev parent, mpr_dir dir, const char *name, int len, mpr_type type, const char *unit, const void *min, const void *max, int *num_inst, mpr_sig_handler *handler, int events)

Global variables are not really an option. Do you have any suggestions?

Cheers,

Mathias

[Joseph Malloch]

Hi Mathias, try this:

void handler(mpr_sig sig, mpr_sig_evt evt, mpr_id inst, int len,
             mpr_type type, const void *val, mpr_time t)
{
    void *data = mpr_obj_get_prop_as_ptr((mpr_obj)sig, MPR_PROP_DATA, 0);
}

int main()
{
    mpr_dev dev = mpr_dev_new("my_device", 0);
    
    float mn = 20.f, mx = 20000.f;
    mpr_sig sig = mpr_sig_new(dev, MPR_DIR_IN, "frequency", 1, MPR_FLT, "Hz",
                              &mn, &mx, NULL, handler, MPR_SIG_UPDATE);
                              
    void *data = ...;
    mpr_obj_set_prop((mpr_obj)sig, MPR_PROP_DATA, NULL, 1, MPR_PTR, &data);
}

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[Mathias Bredholt]

Hi Joe,

Great presentation today and thank you for your help on this. Sorry for the late reply, this got it working, I wasn't using the mpr_obj_set correctly and I didn't know that there was a MPR_PROP_DATA property type. This makes a lot of sense, thank you!

Cheers,

Mathias

Hi Mathias, try this:

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