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 (e-mail address removed)

This ist my code so fare:

std:fstream fileout(_T("C:\\COMbin.hex"),std::ios:ut
|std::ios::trunc|std::ios::binary);

// fileout.setf(std::ios::showbase |std::ios::hex);

int i=0x01;

fileout<< i;

 

[John Harrison]

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 (e-mail address removed)

This ist my code so fare:

std:fstream fileout(_T("C:\\COMbin.hex"),std::ios:ut
|std::ios::trunc|std::ios::binary);

// fileout.setf(std::ios::showbase |std::ios::hex);

int i=0x01;

fileout<< i;

Use write for binary output

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

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

john

 

[Rolf Magnus]

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

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]

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

 

[Kevin Goodsell]

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

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