Ubuntu 17.10下C++定时最小化所有窗口的简易实现方案咨询

Hey there! Since you're new to C++ and don't have much experience with system-specific libraries, let's keep this solution as straightforward as possible. We'll build on your existing code and use a basic Linux tool to handle the window-minimizing part—no fancy GUI libraries required!

Step 1: Install the Required Tool #

First, we need wmctrl, a lightweight command-line tool that lets us control windows on Ubuntu's X11 desktop. Open your terminal and run this to install it:

sudo apt update && sudo apt install wmctrl

Step 2: Full Working Code #

Here's a complete, heavily commented version of the code that does exactly what you need. It's easy to follow even if you're new to C++:

#include <iostream>
#include <chrono>
#include <thread>
#include <cstdlib> // Needed for the system() function

int main() {
    int minutes;
    std::cout << "Enter the number of minutes to wait: ";
    
    // Make sure we get a valid positive number (no letters/negatives)
    while (!(std::cin >> minutes) || minutes <= 0) {
        std::cout << "Oops, please enter a positive whole number: ";
        // Clear invalid input from the buffer so we can try again
        std::cin.clear();
        std::cin.ignore(1000, '\n');
    }

    // Convert minutes to seconds (since our sleep function uses seconds)
    int seconds = minutes * 60;
    std::cout << "Waiting " << minutes << " minutes (" << seconds << " seconds)...\n";

    // Pause the program for the specified time
    std::this_thread::sleep_for(std::chrono::seconds(seconds));

    // Run the wmctrl command to minimize all windows (show desktop)
    std::cout << "Time's up! Minimizing all windows now...\n";
    system("wmctrl -k on");

    return 0;
}

Step 3: What Each Part Does #

Let's break it down so you understand every line:

• Input Check: The loop makes sure you can't enter invalid values (like letters or negative numbers) by prompting you again until you get it right.
• Timing: We use std::this_thread::sleep_for from your existing <chrono> and <thread> libraries to pause the program—this is the "timer" part.
• Window Minimization: The system() function runs the wmctrl -k on command, which tells Ubuntu to "show the desktop"—this automatically minimizes all open windows in one go.

Step 4: Compile and Run #

To get the program working:

1. Save the code as timer.cpp (or any name you prefer).
2. Open your terminal, navigate to the folder where you saved the file, and run this to compile:

g++ timer.cpp -o timer -std=c++11

(The -std=c++11 flag is required because the <chrono> library needs C++11 or newer.)

3. Run the program with:

./timer

Just enter the number of minutes when prompted, and wait—when the timer ends, all your windows will minimize automatically!

内容的提问来源于stack exchange，提问作者Mohammad Jawad Barati