fopen fails to create a file pointer

gaoanyu · #1 01-Jun-2005, 11:44

Dear Friends,

I am very glad to have found this forum, you are doing a great job!

I have a question regarding the access mode "at+" of fopen(). Please see the following pseudo codes

CPP / C++ / C Code:

void aClass::aFunction()
{
   int anInt = getValue(); // Assign a value to anInt
   FILE *pf = fopen("aTextFile.txt","at+");
   fprintf(pf,"%d",anInt);
   fclose(pf);
}

aFunction is called many times in my program. However, after a number of calls, an error occurred and the program stopped. It seems to me that fopen() can not open aTextFile, beacuse in the debugging window it showed "pf 0x00000000". Can anyone suggest a reason why it gave me this? I am using Microsoft Visual Studio .NET 2003, thank you very much in advance!

David

Dave Sinkula · #2 01-Jun-2005, 13:20

Maybe you system can tell you.

CPP / C++ / C Code:

void aClass::aFunction()
{
   int anInt = getValue(); // Assign a value to anInt
   FILE *pf = fopen("aTextFile.txt","at+");
   if ( pf )
   {
      fprintf(pf,"%d",anInt);
      fclose(pf);
   }
   else
   {
      perror("aTextFile.txt");
   }
}

WaltP · #3 01-Jun-2005, 21:33

Quote:

Originally Posted by Dave Sinkula

Maybe you system can tell you.

You may also want to read the sticky about how to post questions. You've left out important information.

gaoanyu · #4 05-Jun-2005, 11:16

Thank you for the reply Dave, and thanks also LuciWiz for correcting the format. I will make sure to post in the right format next time, WaltP.
Back to the post, the perror() function showed me "Too many open files". However, each time after a file is opened, I used fclose() to close it, so I am not sure why there are"Too many open files". Is there any other restriction? Thanks in advance!

David

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