A simple c++ script to send a notification cross-platform.

notification.cpp

#include <iostream>
#include <string>

#if defined(_WIN32) || defined(_WIN64)
#include <windows.h>
#elif defined(__APPLE__)
#include <unistd.h>
#include <sys/wait.h>
#elif defined(__linux__)
#include <unistd.h>
#include <sys/wait.h>
#endif

#if defined(__APPLE__) || defined(__linux__)
void sendLinuxNotification(const std::string &title, const std::string &message) {
    pid_t pid = fork();
    if (pid == 0) {
        execlp("notify-send", "notify-send", title.c_str(), message.c_str(), (char *) NULL);
        _exit(1);
    } else if (pid > 0) {
        wait(NULL);
    }
}

void sendMacNotification(const std::string &title, const std::string &message) {
    pid_t pid = fork();
    if (pid == 0) {
        execlp("osascript", "osascript", "-e", 
               ("display notification \"" + message + "\" with title \"" + title + "\"").c_str(), 
               (char *) NULL);
        _exit(1);
    } else if (pid > 0) {
        wait(NULL);
    }
}
#endif

void sendNotification(const std::string &title, const std::string &message) {
#if defined(_WIN32) || defined(_WIN64)
    MessageBox(0, message.c_str(), title.c_str(), MB_OK | MB_ICONINFORMATION);
#elif defined(__APPLE__)
    sendMacNotification(title, message);
#elif defined(__linux__)
    sendLinuxNotification(title, message);
#else
    std::cerr << "Unsupported platform!" << std::endl;
#endif
}

int main() {
    sendNotification("Hello", "This is a notification");
    return 0;
}