经常遇到要生成许多文件,而且需要保证每个文件的文件名不同的情况,于是产生了下面的通用代码。
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 // 为了生成的文件名唯一 2 #include <stdlib.h> 3 #include <sstream> 4 #include <iomanip> 5 #include <time.h> 6 #include <iostream> 7 8 int64_t s_serialNumber = 0; 9 10 std::string GetTimePidString() { 11 struct ::tm tm_time; 12 time_t timestamp = time(0); 13 localtime_r(×tamp, &tm_time); 14 15 std::ostringstream oss; 16 17 oss << std::setfill('0') 18 << 1900+tm_time.tm_year 19 << std::setw(2) << 1+tm_time.tm_mon 20 << std::setw(2) << tm_time.tm_mday 21 << '-' 22 << std::setw(2) << tm_time.tm_hour 23 << std::setw(2) << tm_time.tm_min 24 << std::setw(2) << tm_time.tm_sec 25 << '.' 26 << getpid(); 27 return oss.str(); 28 } 29 30 int64_t GetSerialNumber() { 31 return __sync_add_and_fetch(&s_serialNumber, 1); 32 } 33 34 int main() { 35 for (int i = 0; i < 3; ++i) { 36 std::string str = GetTimePidString(); 37 int64_t var = GetSerialNumber(); 38 std::ostringstream os; 39 os << var << "_" << str << ".txt"; 40 std::cout << os.str() << std::endl; 41 } 42 }
执行,结果为:
1_20160323-165005.13921.txt
2_20160323-165005.13921.txt
3_20160323-165005.13921.txt
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