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POCreating a text file with a timestamp in the title
 

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  1. POCreating a text file with a timestamp in the title
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    <p>I'm trying to write a program which outputs a lot of data in separate text files. I want the title of each file to be <em>Poker_Log_timestamp_datestamp.txt</em> However, it doesn't actually create the file, nor does it throw any errors!</p> <p>Here's the code:</p> <pre><code>#include &lt;fstream&gt; #include &lt;iostream&gt; #include &lt;ctime&gt; #include &lt;string&gt; 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&lt;&lt;"Filename == "&lt;&lt;filename&lt;&lt;endl; log.open(filename.c_str()); log&lt;&lt;"\n\nHuman won the tournament.\n"; log.close(); system("Pause"); } </code></pre> <p>How do I make this work? One other thing: If I comment out <code>filename.append(stime)</code> and <code>filename.append(sdate)</code>, it works fine.</p> <p>SOLVED :D The file name cant have any slashes or colons, so i replaced them both with dashes. Here is the working code:</p> <pre><code>#include &lt;fstream&gt; #include &lt;iostream&gt; #include &lt;ctime&gt; #include &lt;string&gt; #include &lt;cstdio&gt; 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 i = 0; i&lt;filename.length(); ++i){ if (filename[i] == '/' || filename[i] == ':') filename[i] = '-'; } log.open(filename.c_str()); if (log.fail()) perror(filename.c_str()); log&lt;&lt;"\n\nHuman won the tournament.\n"; log.close(); system("Pause"); } </code></pre>
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    1. USMagicaxis
    1. USMagicaxis
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      1. VTUpMod
    1. COI don't know what these `_strdate_s` and `_strtime_s` functions are, but if the `cout << ...` line immediately before `log.open` prints what you expect it to print, then your problem is *not* with the construction of the filename. You're not checking for errors in `log.open` -- fstreams do *not* (by default) signal failure by throwing an exception. If you add `if (log.fail()) perror(filename.c_str());` immediately after the `log.open` line, what does it print? (May need to add `#include <cstdio>` for that to compile.)
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      1. USzwol
    2. COIt says "Poker_log_17:18:13_03/01/13.txt: Invalid Arguement. I thought maybe the '/'s were confusing it, so i removed the date, but it says the same thing about the time-only version.
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      1. USMagicaxis
    3. COColons may be a problem, too, depending on your file system.
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      1. USAdrian McCarthy
 

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