2021年4月，为了简化班级早自习考勤签到流程，我利用校园卡，独立制作了一个简易考勤打卡系统。整个打卡系统一共花了我32元人民币。

首先我在网购软件上购买了一个能读取IC卡卡号的读卡器（现在网购软件上随手一找最便宜的那种就行了，现在好像20元左右就可以了，我的主要是不确定我们校园卡的ID号长度所以买的读取长度长），将所有同学的校园卡卡号存储到CSV文件中并与学号和姓名一一对应。

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然后是程序的编写——通过C++文件流对CSV文件读取得到学生信息并存储到结构体中，运用标志数组判断每个同学是否已考勤……反正实现其实很简单，主要是知道读卡器上刷卡相当于在电脑在编辑的文件or程序框里面输入卡号并换行。
之后的早自习考勤，我只需要将读卡器连上电脑并运行程序，班级同学在读卡器刷一下校园卡或输入学号就可以进行考勤。

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在考勤过程中，我还可以通过自己的查询命令，实时查询当次还没打卡的同学名单。同时，考勤程序实时将考勤信息输出到CSV文件，考勤结束后我可以通过输出的文件得知各位同学考勤的具体时间。

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以下给出具体代码

#include<cstdio>
#include<iostream>
#include<cstring>
#include<windows.h>
#include<time.h>
using namespace std;
struct Student{
    string CardNum,StudentID,Name;
    int Class,Num;
    bool Sex;
}student[10000];
bool IsBeated[5050];
bool Checked[5050];
static string GetCurrentDateStr()
{
    time_t t = time(NULL);
    char ch[64] = {0};
    strftime(ch, sizeof(ch) - 1, "%Y%m%d%p", localtime(&t));
    return ch;
}
static string GetCurrentTimeStr()
{
    time_t t = time(NULL);
    char ch[64] = {0};
    strftime(ch, sizeof(ch) - 1, "%H:%M:%S", localtime(&t));
    return ch;
}
int main(){
    cout<<"----------------------------------------------------------"<<endl;
    cout<<"Welcome to AA Grade 2020,Class 1 of UESTC BeatCard System!"<<endl;
    cout<<"----------------------------------------------------------"<<endl<<endl;
    cout<<"--------------------------------------------"<<endl;
    cout<<"Loading data..."<<endl;
    freopen("data.csv","r",stdin);
    // freopen("datatry.csv","r",stdin);
    string temp;
    int num1=0;
    while(cin>>temp){
        student[num1].CardNum=temp.substr(1,18);
        student[num1].StudentID=temp.substr(21,13);
        student[num1].Name=temp.substr(37,temp.length());
        if(temp.substr(35,1).compare("b")==0)student[num1].Sex=1;
        else student[num1].Sex=0;
        char* ID=(char*)student[num1].StudentID.substr(8,5).c_str();
        student[num1].Class=(ID[0]-'0')*10+(ID[1]-'0');
        student[num1].Num=(ID[3]-'0')*10+(ID[4]-'0');
        num1++;
    }
    // for(int i=0;i<num1;i++)cout<<student[i].Name<<' '<<student[i].StudentID<<' '<<student[i].CardNum<<endl;
    cin.clear();
    for(int i=0;i<num1;i++){
        IsBeated[student[i].Class*100+student[i].Num]=0;
    }
    cout<<"Data loading sucessfully! Ready to BeatCard!"<<endl;
    cout<<"--------------------------------------------"<<endl<<endl;
    cout<<"---------------------------------------------"<<endl;
    cout<<"Just put your student ID card on the machine."<<endl;
    cout<<"Enter \"quit\" / \"exit\" to exit the system."<<endl;
    cout<<"---------------------------------------------"<<endl<<endl;
    cout<<"------------------"<<endl;
    freopen("CON","r",stdin);
    string Filename;
    string Time=GetCurrentDateStr();
    Filename="log//"+Time+".csv";
    freopen(Filename.c_str(),"a",stdout);
    cout<<"StudentID"<<','<<"Class"<<','<<"Num"<<','<<"Name"<<','<<"EnterTime"<<endl;
    flag:
    while(cin>>temp){
        Time=GetCurrentTimeStr();
        if(temp.compare("exit")==0||temp.compare("quit")==0)break;
        bool IsFound=0;
        // cout<<temp<<endl;
        for(int i=0;i<num1&&!IsFound;i++){
            if(temp.compare(student[i].CardNum)==0||temp.compare(student[i].StudentID)==0){
                IsFound=1;
                if(IsBeated[student[i].Class*100+student[i].Num]==1){
                    freopen("CON","w",stdout);
                    cout<<"You had beat the card!"<<endl<<endl;
                    freopen(Filename.c_str(),"a",stdout);
                    break;
                }
                IsBeated[student[i].Class*100+student[i].Num]=1;
                cout<<"#"+student[i].StudentID<<','<<student[i].Class<<','<<student[i].Num<<','<<student[i].Name<<','<<Time<<endl;
                freopen("CON","w",stdout);
                string Adj;
                if(student[i].Sex)Adj="handsome ";
                else Adj="beautiful ";
                cout<<"The time is "+Time<<endl;
                cout<<"Welcome "+Adj+student[i].Name<<" !"<<endl<<endl;
                freopen(Filename.c_str(),"a",stdout);
            }
        }
        if(IsFound==0){
            freopen("CON","w",stdout);
            cout<<"Error, please change another card!"<<endl<<endl;
            freopen(Filename.c_str(),"a",stdout);
        }
    }
    freopen("CON","w",stdout);
    cout<<"------------------"<<endl;
    cout<<endl<<"-------------------------------------"<<endl;
    memset(Checked,0,sizeof(Checked));
    int NoHereNum=0;
    for(int i=0;i<num1;i++){
        if(IsBeated[student[i].Class*100+student[i].Num]==0&&Checked[student[i].Class*100+student[i].Num]==0){
            NoHereNum++;
            cout<<"Class."<<student[i].Class<<" NO.";
            if(student[i].Num<10)cout<<'0';
            cout<<student[i].Num;
            if(student[i].Name.length()==4)cout<<" ";
            cout<<' '<<student[i].Name;
            if(student[i].Name.length()==4)cout<<" ";
            cout<<" is not here!"<<endl;
            Checked[student[i].Class*100+student[i].Num]=1;
            // IsBeated[student[i].Class][student[i].Num]=1;
        }
    }
    if(NoHereNum==0)cout<<"Congratulations! All people are here!"<<endl;
    cout<<"-------------------------------------"<<endl<<endl;
    cout<<"--------------------------------------------------------------"<<endl;
    cout<<"Enter \"quit\" / \"exit\" to quit or enter \"continue\" to continue."<<endl;
    cout<<"--------------------------------------------------------------"<<endl<<endl;
    cout<<"------------------"<<endl;
    while(cin>>temp){
        if(temp.compare("exit")==0||temp.compare("quit")==0)break;
        if(temp.compare("continue")==0){
            cout<<"------------------"<<endl<<endl;
            cout<<"------------------"<<endl;
            freopen(Filename.c_str(),"a",stdout);
            goto flag;
        }
    }
    cout<<"------------------"<<endl;
    return 0;
}

小彩蛋~看看当时学期始末的考勤签到情况表！绿色是请假，黄色是迟到，红色是缺勤。有坏蛋一直不来！！！

学期初考勤情况

学期末考勤情况