我已经完成了读取传感器数据并将其存储到CSV文件中的任务。但是每次我想停止阅读&存储传感器数据,我必须关闭EXE文件。由于出厂操作,他们希望在一个月内不关闭EXE文件的情况下连续运行该程序。我被要求修改代码以在一段时间后生成新的CSV文件(例如1小时(。因此,文件名可能:20190516_10H0M0S,20190516_11H0M0S,20190516_12H0M0S ...
我尝试使用(struct tm)
和for(;timeinfo->tm_min < 60;)
来制作60'后生产的新CSV。但是,每个循环,项目数据,时间,频道都会再次写入CSV。看起来很奇怪。但是,当我创建文件dest并将dest.open放在外部循环外时,它仅存储正确的数据格式,而无需创建新的CSV。请建议我如何使其作为期望。
void EX_GetMultiValue(LONG i_lDriverHandle,
WORD i_wSlotID,
struct SlotInfo &i_SlotInfo)
{
char filename[20], filename2[20];
time_t rawtime;
struct tm * timeinfo;
time(&rawtime);
timeinfo = localtime(&rawtime);
timeinfo->tm_mon++; // Because the range of tm_mon is 0~11, so we need to increment it by 1
timeinfo->tm_year = timeinfo->tm_year + 1900; // Because year counted since 1900
clock_t start = clock();
sprintf(filename,
"%04d%02d%02d_%02dh%02dm%02ds.csv",
timeinfo->tm_year,
timeinfo->tm_mon,
timeinfo->tm_mday,
timeinfo->tm_hour,
timeinfo->tm_min,
timeinfo->tm_sec);
printf("nFilename: %s", filename);
ofstream dest2;
dest2.open(filename, ios_base::app | ios_base::out);
dest2 << "Date" << "," << "Time" << "," << "milisecond" << ","
<< "Channel 0" << "," << "Channel 1" << "," << "Channel 2" << ","
<< "Channel 3" << "," << "Channel 4" << "," << "Channel 5" << ","
<< "Channel 6" << "," << "Channel 7" << "," << "Channel 8" << ","
<< "Channel 9" << "," << "Channel 10" << "," << "Channel 11" << ","
<< endl;
for (; timeinfo->tm_min < 60;)
{
ofstream dest;
dest.open(filename, ios_base::app | ios_base::out);
LONG lGetMultiValueResult = AIO_GetValues(i_lDriverHandle,
i_wSlotID,
wRawValue); //get raw value
if (ERR_SUCCESS == lGetMultiValueResult)
{
clock_t timeElapsed = clock() - start;
unsigned secElapsed = timeElapsed / CLOCKS_PER_SEC;
unsigned msElapsed = timeElapsed / CLOCKS_PER_MS;
while (msElapsed >= 1000)
msElapsed -= 1000;
while ((timeinfo->tm_sec + secElapsed) > 59)
{
timeinfo->tm_sec -= 60;
timeinfo->tm_min++;
}
while (timeinfo->tm_min > 59)
{
timeinfo->tm_min -= 60;
timeinfo->tm_hour++;
}
while (timeinfo->tm_hour > 23)
{
timeinfo->tm_hour -= 24;
timeinfo->tm_mday++;
}
dest << timeinfo->tm_year << "-" << timeinfo->tm_mon << "-"
<< timeinfo->tm_mday << "," << timeinfo->tm_hour << "h"
<< timeinfo->tm_min << "m" << timeinfo->tm_sec + secElapsed
<< "s" << ",";
dest << msElapsed << "ms" << ",";
for (iCnt = 0; iCnt < g_ChannelNum; iCnt++)
{
wRangeType = *(i_SlotInfo.wChRange + iCnt); //get range type
EX_ScaleRawValue(wRangeType,
wRawValue[iCnt],
&dScaledValue,
cUnit); //get scale value
if (strcmp(cUnit, "UN") != 0)
{
printf("Channel %d raw data is 0x%04X, scaled value is %.4f %s.n",
iCnt,
wRawValue[iCnt],
dScaledValue,
cUnit);
dest << dScaledValue << ",";
Sleep(1);
}
else
printf("Channel %d range is unknown.n", iCnt);
}
dest << endl;
}
else
printf("Fail to get value, error code = %dn",
lGetMultiValueResult);
dest.close();
dest2.close();
if (dest == NULL)
{
perror("Error creating file: ");
return;
}
}
使用标准C - 设施和Howard Hinnants date.h
:
#include <chrono>
#include <string>
#include <iostream>
#include "date.h"
int main()
{
auto now{ std::chrono::system_clock::now() };
std::string filename{ date::format("%Y%m%e_%Hh%Mm%Ss.csv", now) };
std::cout << filename << 'n';
}
我不知道您要使用什么代码,所以...