C++如何实现一个命令行进度条_在C++控制台程序中显示任务进度的技巧

#include <iostream>
#include <iomanip>
#include <thread>
#include <chrono>
<p>void showProgressBar(int current, int total) {
float progress = static_cast<float>(current) / total;
int barWidth = 50;</p><pre class='brush:php;toolbar:false;'>std::cout << "\r[";
int pos = barWidth * progress;
for (int i = 0; i < barWidth; ++i) {
    if (i < pos) std::cout << "=";
    else if (i == pos) std::cout << ">";
    else std::cout << " ";
}
std::cout << "] " << int(progress * 100.0) << "%";
std::cout.flush(); // 确保立即输出

class ProgressBar {
public:
    ProgressBar(int total, int width = 50)
        : total_(total), width_(width), start_(std::chrono::high_resolution_clock::now()) {}
<pre class='brush:php;toolbar:false;'>void update(int current) {
    auto now = std::chrono::high_resolution_clock::now();
    auto duration = std::chrono::duration_cast<std::chrono::seconds>(now - start_).count();
    float progress = static_cast<float>(current) / total_;
    int pos = width_ * progress;

    std::cout << "\r[";
    for (int i = 0; i < width_; ++i) {
        if (i < pos) std::cout << "=";
        else if (i == pos) std::cout << ">";
        else std::cout << " ";
    }
    std::cout << "] " << std::setw(3) << int(progress * 100) << "% ";
    if (current > 0) {
        float rate = duration / static_cast<float>(current);
        int remaining = static_cast<int>(rate * (total_ - current));
        std::cout << remaining << "s left";
    }
    std::cout.flush();
}

void done() {
    std::cout << std::endl;
}

ProgressBar pb(200);
for (int i = 0; i <= 200; ++i) {
    pb.update(i);
    std::this_thread::sleep_for(std::chrono::milliseconds(50));
}
pb.done();