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Groups > comp.lang.c++.moderated > #1988

Re: Multiple files in one

Cross-posted to 2 groups.

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fryme wrote:
> [...]
> For that purpose i'm using std::ios::binary. Here is some code,
> describes that process (it is sketch, not last variant):

You expect us to find bugs in a "sketch"?

> [...]
> std::fstream m_out(output_file_path, std::ios::out |
> std::ios::binary);
> std::ifstream input_image(m_image_file_path.toUtf8().data());
                                              ^^^^^^^^^^^^^^^
All right, you are using Qt.

> input_image.seekg(0, std::ios::end);
> image_length = input_image.tellg();
> input_image.seekg(0, std::ios::beg);
>
> // writing image length to output file
> m_out.write( (const char *)&image_length, sizeof(long long) );
>
> char *buffer = new char[image_length];
> input.read(buffer, image_length);
  ^^^^^
I guess you mean "input_image", not "input".

> [...]
> std::fstream m_in(m_file_path.toUtf8().data(), std::ios::in );

There is no "std::ios::binary" here. Is this just a detail missing
from the "sketch"?

> m_in.seekg(0, std::ios::beg);
> m_in.read((char *)&image_length, sizeof(long long));
> m_in.seekg(sizeof(long long));

As far as I know, the second argument of "seekg" has no default value.

> [...]
> std::fstream fs("E:\\Temp\\out.jpg");

Again no "std::ios::binary" here.

Please, create working example code.

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Multiple files in one fryme <oleg.fry@gmail.com> - 2011-09-12 11:44 -0700
  Re: Multiple files in one Alexander Bartolich <alexander.bartolich@gmx.at> - 2011-09-12 17:31 -0700
  Re: Multiple files in one Paavo Helde <myfirstname@osa.pri.ee> - 2011-09-12 17:32 -0700
  Re: Multiple files in one red floyd <no.spam.here@its.invalid> - 2011-09-12 17:32 -0700
  Re: Multiple files in one Daniel Krügler <daniel.kruegler@googlemail.com> - 2011-09-12 17:32 -0700
  Re: Multiple files in one Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-09-12 17:34 -0700
  Re: Multiple files in one Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2011-09-13 10:51 -0700
  Re: Multiple files in one Daniel James <daniel@me.invalid> - 2011-09-13 10:53 -0700

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