c++ - Creating a text file with a timestamp in the title -

i'm trying write program outputs lot of data in separate text files. want title of each file poker_log_timestamp_datestamp.txt however, doesn't create file, nor throw errors!

here's code:

#include <fstream> #include <iostream> #include <ctime> #include <string> using namespace std;  int main(){     char sdate[9];     char stime[9];     fstream log;     _strdate_s(sdate);     _strtime_s(stime);     string filename = "poker_log_";     filename.append(stime);     filename.append("_");     filename.append(sdate);     filename.append(".txt");     cout<<"filename == "<<filename<<endl;     log.open(filename.c_str());     log<<"\n\nhuman won tournament.\n";     log.close();     system("pause"); } 

how make work? 1 other thing: if comment out filename.append(stime) , filename.append(sdate), works fine.

solved :d file name cant have slashes or colons, replaced them both dashes. here working code:

#include <fstream> #include <iostream> #include <ctime> #include <string> #include <cstdio>  using namespace std;  int main(){     char sdate[9];     char stime[9];     ofstream log;     _strdate_s(sdate);     _strtime_s(stime);     string filename = "poker_log_";     filename.append(stime);     filename.append("_");     filename.append(sdate);     filename.append(".txt");     for(int = 0; i<filename.length(); ++i){         if (filename[i] == '/' || filename[i] == ':')             filename[i] = '-';     }     log.open(filename.c_str());     if (log.fail())         perror(filename.c_str());      log<<"\n\nhuman won tournament.\n";     log.close();     system("pause"); } 

the date , time strings may have characters in them (like colons) may not legal characters file system.