C++ io-stream how to write a real hex file

[Markus Hämmerli]

I ll try to write a file with a iostram. It is ok for ASCII but don't work
for hex .

So when i send a "01" I get ASCII 31 but Iwant a real 01 in the file.



Thanks Markus m.haemmerli@sol net.ch

This ist my code so fare:

std::ofstream fileout(_T("C:\ \COMbin.hex"),s td::ios::out
|std::ios::trun c|std::ios::bin ary);

// fileout.setf(st d::ios::showbas e |std::ios::hex) ;

int i=0x01;

fileout<< i;

[John Harrison]

Re: C++ io-stream how to write a real hex file


"Markus Hämmerli" <m.haemmerli@so lnet.ch> wrote in message
news:3f54e954$0 $20058$fb624d75 @newsspool.soln et.ch...[color=blue]
>
> I ll try to write a file with a iostram. It is ok for ASCII but don't[/color]
work[color=blue]
> for hex .
>
> So when i send a "01" I get ASCII 31 but Iwant a real 01 in the file.
>
>
>
> Thanks Markus m.haemmerli@sol net.ch
>
> This ist my code so fare:
>
> std::ofstream fileout(_T("C:\ \COMbin.hex"),s td::ios::out
> |std::ios::trun c|std::ios::bin ary);
>
> // fileout.setf(st d::ios::showbas e |std::ios::hex) ;
>
> int i=0x01;
>
> fileout<< i;
>[/color]

Use write for binary output

fileout.write(( char*)&i, sizeof i);

Also use read for binary input. << is for text only.

john

[Rolf Magnus]

Re: C++ io-stream how to write a real hex file

Markus Hämmerli wrote:
[color=blue]
>
> I ll try to write a file with a iostram. It is ok for ASCII but don't
> work for hex .[/color]

Well, operator<< is for formatted text output. So it will convert
everything you have to text and write that text.
If you want to write binary data (I assume that's what you mean by
"hex"), you should read the faq at

http://www.parashift.com/c++-faq-lite/

Look especially at the chapter about serialization.

[Xenos]

Re: C++ io-stream how to write a real hex file

Don't use the stream operators, you will get ASCII. Use the read/write
methods.

"Markus Hämmerli" <m.haemmerli@so lnet.ch> wrote in message
news:3f54e954$0 $20058$fb624d75 @newsspool.soln et.ch...[color=blue]
>
> I ll try to write a file with a iostram. It is ok for ASCII but don't[/color]
work[color=blue]
> for hex .
>
> So when i send a "01" I get ASCII 31 but Iwant a real 01 in the file.
>
>
>
> Thanks Markus m.haemmerli@sol net.ch
>
> This ist my code so fare:
>
> std::ofstream fileout(_T("C:\ \COMbin.hex"),s td::ios::out
> |std::ios::trun c|std::ios::bin ary);
>
> // fileout.setf(st d::ios::showbas e |std::ios::hex) ;
>
> int i=0x01;
>
> fileout<< i;
>
>
>[/color]

[Kevin Goodsell]

Re: C++ io-stream how to write a real hex file

Xenos wrote:
[color=blue]
> Don't use the stream operators, you will get ASCII. Use the read/write
> methods.[/color]

Please don't top-post. Re-read section 5 of the FAQ for posting guidelines.

http://www.parashift.com/c++-faq-lite/

Your assumption that the implementation uses the ASCII character set is
unfounded.

-Kevin



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