我正在尝试将格式为HHMMSS.SS,DD,MM,YYYY的时间转换为unix时间。问题是然后调用mktime,返回相同的time_t。
ConvertTime(std::string input)
{
std::vector<std::string> tokens;
//splits input into tokens
Tokenize(input, tokens);
int hrs = atoi( tokens.at(0).substr(0,2).c_str() );
int mins = atoi( tokens.at(0).substr(2,2).c_str() );
int secs = atoi( tokens.at(0).substr(4,2).c_str() );
int day = atoi( tokens.at(1).c_str() );
int month = atoi( tokens.at(2).c_str() );
int year = atoi( tokens.at(3).c_str() );
struct tm tm = {0};
time_t msgTime = 0;
tm.tm_sec = secs;
tm.tm_min = mins;
tm.tm_hour = hrs;
tm.tm_mday = day;
tm.tm_mon = month-1;
tm.tm_year = year-1900;
tm.tm_isdst = -1;
msgTime = mktime(&tm);
printf("time: %f\n",msgTime);
}
Input ex:
154831.90,22,07,2016
154832.10,22,07,2016
154832.30,22,07,2016
154832.50,22,07,2016
154832.70,22,07,2016
154832.90,22,07,2016
154833.10,22,07,2016
Output ex:
1469202560.00
1469202560.00
1469202560.00
1469202560.00
1469202560.00
1469202560.00
1469202560.00
我觉得我没有初始化某些东西,或者值没有被改变,但是tm结构不应该在ConvertTime的调用之间进行,所以我不确定是什么问题。
答案 0 :(得分:1)
这里的问题是尝试将time_t(msgTime)值用作double,而不进行强制转换。
解决方案是简单地将msgTime转换为double,如下所示:
printf("time %f\n",(double)msgTime);
这使得功能:
ConvertTime(std::string input)
{
std::vector<std::string> tokens;
//splits input into tokens
Tokenize(input, tokens);
int hrs = atoi( tokens.at(0).substr(0,2).c_str() );
int mins = atoi( tokens.at(0).substr(2,2).c_str() );
int secs = atoi( tokens.at(0).substr(4,2).c_str() );
int day = atoi( tokens.at(1).c_str() );
int month = atoi( tokens.at(2).c_str() );
int year = atoi( tokens.at(3).c_str() );
struct tm tm = {0};
time_t msgTime = 0;
tm.tm_sec = secs;
tm.tm_min = mins;
tm.tm_hour = hrs;
tm.tm_mday = day;
tm.tm_mon = month-1;
tm.tm_year = year-1900;
tm.tm_isdst = -1;
msgTime = mktime(&tm);
printf("time: %f\n",(double)msgTime);
}
Input ex:
154831.90,22,07,2016
154832.10,22,07,2016
154832.30,22,07,2016
154832.50,22,07,2016
154832.70,22,07,2016
154832.90,22,07,2016
154833.10,22,07,2016
Output ex:
1469202511.00
1469202512.00
1469202512.00
1469202512.00
1469202512.00
1469202512.00
1469202513.00