MFC读取导航电文有问题

Question

读取文件链接: https://pan.baidu.com/s/1q1y_4be_HiRdnoWsEdsXIA?pwd=0000 提取码: 0000

利用文件读取发现无法读取，不知道是不是e-1什么的没读取进去的原因
文件读取格式如图所示

#include <math.h>
#include<fstream>
using namespace std;
#define PI 3.1415926535897932384626433832795

xl dq[200];
CString openpath;
bool flag0;

struct xl //星历
{
    char gps[10];//存储PRN和历元
    int year;
    int month;
    int day;
    int hour;
    int minute;
    int second;
    double   ClkBias;//偏差
    double   ClkDrift;//漂移
    double   ClkDriftRate;//漂移速度
    double   IODE;
    double   Crs;
    double   DetlaN;
    double   M0;
    double   Cuc;
    double   e;
    double   Cus;
    double   SqrtA;
    double   TOE;
    double   Cic;
    double   Omega;
    double   Cis;
    double   i0;
    double   Crc;
    double   omega;
    double   OmegaDot;
    double   iDot;
    double   codesOnL2Channel;
    double   GPSWeek;
    double   L2PDataFlag;
    double   SVAccuracy;
    double   SVHealth;
    double   TGD;
    double   IODC;
    double   TransTimeOfMsg;
    double   Spare1;
    double   Spare2;
    double   Spare3; 
};

void C星历文件View::readfile()
{
        CString filter(_T("17n文件|*.17n||ALL FILES||*.*|"));
        CFileDialog dlg(true, NULL, NULL, NULL, filter, this);
        if (dlg.DoModal() != IDOK)
        {
            MessageBox(_T("文件未打开"), _T("警告！"), MB_ICONWARNING);
            flag0 = false;
            return;
        }
        else
        {
        openpath = dlg.GetPathName();
        MessageBox(_T("打开文件成功"), _T("提示！"), MB_ICONWARNING);
        flag0 = true;
        }
        
        int i, j;
        char line[60];
        char line2[300];
        ifstream fp(openpath);
        for (i = 0; i < 7; i++)
        {
            fp.getline(line, 60, '\n');
        }
        for (i = 0;; i++)
        {
            fp.getline(line2, 300, '\n');
            for (j = 0; j < 300; j++)
            {
                if (line2[j] == 'D')
                    line2[j] = 'e';
            }
            sscanf_s(line2, "%s %d %d %d %d %d %d %lf %lf %lf", dq[i].gps, _countof(dq[i].gps), &dq[i].year, &dq[i].month, &dq[i].day, &dq[i].hour, &dq[i].minute, &dq[i].second, &dq[i].ClkBias, &dq[i].ClkDrift, &dq[i].ClkDriftRate);//无法读取
            fp.getline(line2, 300, '\n');
            for (j = 0; j < 300; j++)
            {
                if (line2[j] == 'D')
                    line2[j] = 'e';
            }
            sscanf_s(line2, "%lf %lf %lf %lf", &dq[i].IODE, &dq[i].Crs, &dq[i].DetlaN, &dq[i].M0);//无法读取

        }
        
}

Answer 1

你这个数据样本不太整齐啊。比如第一行前两个浮点数之间没有空格啊，这样%lf%lf输入时，第二个是不能正确读取的
仔细数了数，你的浮点数都占19位，如果是正数，那么是18位加一个空格，但如果是负数，占满了19位，导致缺少空格
既然确定长度固定，建议改为:
sscanf_s(line2, "%s %d %d %d %d %d %d %19lf%19lf%19lf", dq[i].gps, _countof(dq[i].gps), &dq[i].year, &dq[i].month, &dq[i].day, &dq[i].hour, &dq[i].minute, &dq[i].second, &dq[i].ClkBias, &dq[i].ClkDrift, &dq[i].ClkDriftRate);//无法读取