Proc "debug assertion failed!"

Question

hi,
i m working on oracle 9i on windows ,when i run a proc then i get these error at end of proc, tell y m i getting these error
debug assertion failed!
program:preptty.exe
file:fprintf.c
line:56
expression:str !=null
for information on how your program can cause an assertion
failure,see the visual c++ documentation on asserts.
(please retry to debug the application)
and then
APPLICATION ERROR
this instruction at "0x0040809c" referenced memory at "0x00000010".
the memory could not be "read".
click on OK to terminate the program
click on CANCEL to debug the program
now i came to know that in my proc where i used lots of time printf command
fprintf(ptr,"Calculation Terminated Sucessfully!!!\n");
there i m having this problem but when i coment these printf commands i didnt get this error
id idnt know why this error coming now and how to resolve it ?
thanks

Answer 1

Why do you suspect an operating system issue?
I'm guessing you are on Windows. If you look at fprintf.c and line 55/56 you should see:
VALIDATERETURN( (str != NULL), EINVAL, -1);
VALIDATERETURN( (format != NULL), EINVAL, -1);
These are the checks for the file pointer and the format control string and if either is NULL an assertion is raised.
Here's an easy way to see this:
{noformat}
 * this will cause an assertion
fprintf(NULL, "bad!");
{noformat}
{noformat}
 * this will cause an assertion
fprintf(fp, NULL);
{noformat}
Have you confirmed that the assertion is raised from:
fprintf(ptr,"Calculation Terminated Sucessfully!!!\n");
Since you have "expression:str !=null" that is an indication that the file pointer is NULL. Perhaps you are not checking the file pointer before using it and it is NULL?
Regards,
Mark