Syntax for callback as class member function

Hi! I'm trying to make a C++ class that handles a DAQmx data aquisition task. I am using DAQmxRegisterEveryNSamplesEvent to call a callback when I collected enough samples to process. I wanted to add the callback as a member function of my class, but doing so causes errors:

E0167 argument of type "int32 (__cdecl NiDAQmxHandler::*)(TaskHandle handle, int32 everyNsamplesEventType, uInt32 nSamples, void *callbackData)" is incompatible with parameter of type "DAQmxEveryNSamplesEventCallbackPtr"

C3867 'NiDAQmxHandler::readData': non-standard syntax; use '&' to create a pointer to member

Removing the function from the class and simply keeping it in the cpp file works fine.

What is the syntax for adding a callback as a member function of a class?

Here's a slimmed down example:

main.cpp

#include "nidaqmxhandler.h"

int main(int argc, char *argv[])
{
    NiDAQmxHandler taskhandler;

    taskhandler.initDataCollection();
    taskhandler.startTask();

    return 0;
}

 nidaqmxhandler.h

#pragma once
#include <NIDAQmx.h>

class NiDAQmxHandler
{
public:
    NiDAQmxHandler();
    ~NiDAQmxHandler() = default;

    void initDataCollection(void);
    void startTask();
private: 
    int32 CVICALLBACK readData(TaskHandle taskHandle, int32 everyNsamplesEventType, uInt32 nSamples, void* callbackData);

    TaskHandle taskHandle;

};

nidaqmxhandler.cpp

#include "nidaqmxhandler.h"
#include <vector>

#define DAQmxErrChk(functionCall) if( DAQmxFailed(error=(functionCall)) ) goto Error; else

int32 CVICALLBACK NiDAQmxHandler::readData(TaskHandle handle, int32 everyNsamplesEventType, uInt32 nSamples, void* callbackData)
{
    printf("Test successful");
    return 0;
}

void NiDAQmxHandler::initDataCollection(void)
{
    DAQmxCreateTask("", &taskHandle);
    DAQmxCreateAIVoltageChan(taskHandle, "Dev3/ai0", "", DAQmx_Val_Cfg_Default, -10.0, 10.0, DAQmx_Val_Volts, NULL);
    DAQmxCfgSampClkTiming(taskHandle, "", 1000.0, DAQmx_Val_Rising, DAQmx_Val_ContSamps, 100);
    DAQmxRegisterEveryNSamplesEvent(taskHandle, DAQmx_Val_Acquired_Into_Buffer, 100, 0, readData, NULL);

    return;
}

void NiDAQmxHandler::startTask()
{
    DAQmxStartTask(taskHandle);
    return;
}

Thanks!