Dear All,
I have line of code
fprintf(Fp_write, "%x", *Data++);
Data is char *,
The problem in the above line of code
its says that data is char but you print in the file with binary mode
i.e "%x", this x is unsigned int.... so when we print in the file
we get the extra field as the ffffff as the prefix on most of the
data.
I can understand this problem as I am trying to take the char pointer
value but forcing the compiler to print in the unsigned int format
i.e (%x)... But I dont know how to fix ? as i only want to print
the char data into the binary.
any idea and pointer to this
Thanks In Advance.
Ranjeet 4 1165 ra***********@gmail.com wrote on 15/07/05 : fprintf(Fp_write, "%x", *Data++);
It's not recommended to use a unary operator in a parameter. The result
is implementation-dependent, and the semantic is unclear...
Prefer
fprintf (Fp_write, "%x", *Data);
Data++;
Data is char *,
If so, there is a type problem. "%x" is expecting an unsigned int. Note
also that a char could be signed (it's implementation-dependent). To
have it right, I suggest :
fprintf (Fp_write, "%x", (unsigned) (unsigned char) *Data);
Data++;
--
Emmanuel
The C-FAQ: http://www.eskimo.com/~scs/C-faq/faq.html
The C-library: http://www.dinkumware.com/refxc.html
"Clearly your code does not meet the original spec."
"You are sentenced to 30 lashes with a wet noodle."
-- Jerry Coffin in a.l.c.c++
Emmanuel Delahaye wrote: ra***********@gmail.com wrote on 15/07/05 : fprintf(Fp_write, "%x", *Data++); It's not recommended to use a unary operator in a parameter. The result is implementation-dependent, and the semantic is unclear...
Prefer
fprintf (Fp_write, "%x", *Data); Data++;
Data is char *,
If so, there is a type problem. "%x" is expecting an unsigned int. Note also that a char could be signed (it's implementation-dependent). To have it right, I suggest :
fprintf (Fp_write, "%x", (unsigned) (unsigned char) *Data); Data++;
Thanks Emmanuel you cleared my issue, Thanks
Ranjeet -- Emmanuel The C-FAQ: http://www.eskimo.com/~scs/C-faq/faq.html The C-library: http://www.dinkumware.com/refxc.html
"Clearly your code does not meet the original spec." "You are sentenced to 30 lashes with a wet noodle." -- Jerry Coffin in a.l.c.c++
Hello Emmanuel,
Emmanuel Delahaye <em***@YOURBRAnoos.fr> wrote: ra***********@gmail.com wrote on 15/07/05 : fprintf(Fp_write, "%x", *Data++);
It's not recommended to use a unary operator in a parameter. The result is implementation-dependent, and the semantic is unclear...
Prefer fprintf (Fp_write, "%x", *Data); Data++;
Can you please elaborate where the problem is in this construction of
the OP? I do not see any problem in it as long as fprintf() is not a
makro. As Data is not used more than once in this line, it seems
well-defined to me.
Regards,
Spiro.
Spiro Trikaliotis wrote: Hello Emmanuel,
Emmanuel Delahaye <em***@YOURBRAnoos.fr> wrote:
ra***********@gmail.com wrote on 15/07/05 : fprintf(Fp_write, "%x", *Data++);
It's not recommended to use a unary operator in a parameter. The result is implementation-dependent, and the semantic is unclear...
Prefer fprintf (Fp_write, "%x", *Data); Data++;
Can you please elaborate where the problem is in this construction of the OP? I do not see any problem in it as long as fprintf() is not a makro. As Data is not used more than once in this line, it seems well-defined to me.
*Data++ is indeed well-defined, and a well-known idiom. I think Emmanuel was
concerned that the OP was not using "good style", although I think on this
occasion there wasn't anything wrong with it. We are, after all, supposed
to be writing C, not BASIC.
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999 http://www.cpax.org.uk
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