Callback

Functions
int32_t	VkDaqSetDeviceNotifyCallback (device_notify_callback_t callback)
	Device online or offline notification.

Detailed Description

Function Documentation

VkDaqSetDeviceNotifyCallback()

int32_t VkDaqSetDeviceNotifyCallback

(

device_notify_callback_t

callback

)

Device online or offline notification.

data type	parameter	describe
device_notify_callback_t	callback	Input function pointer, format:： void(*device_notify_callback_t)(const char* notifyDevice, int32_t notifyType); Input function description : notifyDevice：Notification device name. notifyType：Types of device notifications： 0：Device online. 1：Device online

Returns

On success, return value >= 0.

On failure, returns a negative error number.For detail, please Call VkDaqGetLastErrorInfo

C language reference

#include <stdio.h>
#include "libvkdaq.h"
 
// Correct callback function definition
void __cdecl MyDeviceNotifyCallback(const char* deviceName, int32_t notifyType) {
    if (notifyType == VkDaq_Val_DeviceNotifyType_Added) {
        printf("[Device online] %s\n", deviceName);
    }
    else if (notifyType == VkDaq_Val_DeviceNotifyType_Removed) {
        printf("[Device offline] %s\n", deviceName);
    }
}
 
int main(int argc, char* argv[]) {
    // Registering Callbacks
    int32_t result = VkDaqSetDeviceNotifyCallback(MyDeviceNotifyCallback); 
    if (result != 0) {
        printf("Failed to set callback! error code: %d\n", result); 
        return -1;
    }
 
    while (1) {
        // Keep the program running
    }
 
    return 0;
}