【Linux系统】第六节—简易倒计时+进度条（详解）

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发布于 2025-06-02 13:06:35

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代码可运行

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代码可运行

【本节课知识点画板】

前奏知识点

1、回车和换行

回⻋概念
换⾏概念
⽼式打字机的例⼦
\r&&\n

2、⾏缓冲区

什么现象？

#include <stdio.h>
int main()
{
    printf("hello bite!\n");
    sleep(3);
    return 0;
}

什么现象？？

#include <stdio.h>
int main()
{
    printf("hello bite!");
    sleep(3);
    return 0;
}

什么现象？？？

#include <stdio.h>
int main()
{
    printf("hello bite!");
    fflush(stdout);
    sleep(3);
    return 0;
}

五、练手—倒计时小程序

#include<stdio.h>
#include<unistd.h>

int main()
{
    int cnt = 10;

    while(cnt >= 0)
    {
        printf("%-2d\r",cnt);
        fflush(stdout);
        sleep(1);
        cnt--;
    }

    printf("\n");

    return 0;
}

六、进度条

process.h

#pragma once
#include<stdio.h>

void FlushProcess();

process.c

define SIZE 101
  #define STYLE '#'
  
  //v2:根据进度，动态刷新进度条
  void FlushProcess(double total,double current)
  {
      const char* lable = "|/-\\";
      int len = strlen(lable);
      static index = 0;
      char buffer[SIZE];
      memset(buffer,0,sizeof(buffer));
  
      double rate = current*100/total;
      int num = (int)rate;
  
      int i = 0;
      for(;i < num;i++)
      {
          buffer[i] = STYLE;
      }
      printf("[%-100s][%.1lf%%][%c]\r",buffer,rate,lable[index++]);
      fflush(stdout);
      index %= len;
  
      if(num >= 100)
      {
          printf("\n");
      }
  
  }

//v1:展示进度条的基本功能
  void process()
  {
      int rate = 0;
      char buffer[SIZE];
      memset(buffer,0 , sizeof(buffer));
      const char* lable="|/-\\";
      int len = strlen(lable);
  
      while(rate <= 100)
      {
          printf("[%-100s][%d%%][%c]\r",buffer,rate,lable[rate%len]);
          fflush(stdout);
          buffer[rate] = STYLE; 
          rate++;
          usleep(50000);
      }
  
      printf("\n");
  }

main.c

#include"process.h"
  #include<stdlib.h>
  #include<time.h>
      
  double total = 1024.0;    
  double speed[] = {1.0,0.5,0.2,0.1,0.01,0.02};    
      
  void download()    
  {    
      double current = 0.0;    
      srand(time(NULL));    
      
      while(current <= total)    
      {    
         FlushProcess(total,current);    
      
          if(current == total)    
              break;    
      
          //下载代码    
          int random = rand()%6;    
          usleep(5000);    
          current += speed[random];    
          if(current >= total)    
          {    
              current = total;    
           }    
      
      
      }    
      
  }                                                                                                                                                                              
      
  int main()    
  {    
      download();    
      
      return 0;  
  }

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原始发表：2025-05-15，如有侵权请联系 cloudcommunity@tencent.com 删除

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