C++ Binary File I/O

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Class RWbostream specializes the abstract base class RWvostream to store variables in binary format. The results can be restored by using its counterpart RWbistream.

You can think of it as a binary veneer over an associated std:: Because the RWbostream retains no information about the state of streambuf in binary mode associated streambufits use can be freely exchanged with other users of the streambuf such as std:: Note that variables should not be separated with white space.

Such white space would be interpreted literally and would have to be read back in as a character string.

RWbostream can be interrogated as to the stream state using member functions goodbadeofetc. See RWbistream for an example of how the file " data. Construct an RWbostream from the streambuf s.

For DOS, the streambuf in binary mode must have been opened in binary mode. Construct an RWbostream from the streambuf associated with the output stream str. This can be done by specifying ios:: Using the example above, the line to create the ofstream would read, ofstream fstr "data. Redefined from class RWvostream. Store the character string starting at s to the output stream in binary.

The character string is expected to be null terminated. Store the wide character string starting at ws to the output stream in binary.

The wide character string is expected to be null terminated. Store the char c to the output stream in binary. Store the wide char wc to the output stream in binary. Store the unsigned char c to the output stream in binary. Store the double d to the output stream in binary. Store the long double d to the output stream in binary. This operator function is only available if your compiler supports the long double d type. Store the float f to the output stream in binary.

Store the int i to the output stream in binary. Store the unsigned int i to the output stream in binary. Store the long l to the output stream in binary.

Store the long long l to the output stream in binary. This operator function is only available if your compiler supports the long long l type. Store the unsigned long l to the output stream in binary. Store the unsigned streambuf in binary mode long to the output stream in binary.

This operator function is only available if your compiler supports the unsigned long long type. Streambuf in binary mode the short s to the output stream in binary. Store the unsigned short s to the output stream in binary. Inherited via RWvostream from RWvios. Store the char c to the output stream.

Store the wide character wc to the output stream. Store the unsigned binary options 0 1 net 10 terms and conditions c to the output stream. Store the vector of char s starting at p to the output stream in binary. Store the vector of wide char s starting at p to the output stream in binary. Store the vector of unsigned char s starting at p to the output stream in binary.

Store the vector of short s starting at p to the output stream in binary. Store the vector of unsigned short s starting at p to the output stream in binary. Store the vector of int s starting at p to the output stream in binary. Store the vector of unsigned int s streambuf in binary mode at streambuf in binary mode to the output stream in binary.

Store the vector of long s starting at p to the output stream in binary. Store the vector of long long s starting at p to the output stream in binary. This operator function is only available if your compiler supports the const long long type. Store the streambuf in binary mode of unsigned long s starting at p to the output stream in binary. Store the vector of unsigned long long s starting at p to the output stream in binary.

This operator function is only available if your compiler supports the const unsigned long long type. Store the vector streambuf in binary mode float s starting at p streambuf in binary mode the output stream in binary.

Store the vector of double s starting at p to the output stream in binary. Store the vector of long double s starting at p to the output stream in binary. This operator function is only available if your compiler supports the const long double type.

Data is formatted as a string containing N streambuf in binary mode. Store the character string, including embedded nullsstarting at s to the output string. All other trademarks are the property of their respective owners. Contact Rogue Wave about documentation or support issues.

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So you want to copy a file quickly and easily, and most important, completely portably. Code it up and try it. In particular, they break up on whitespace. Why a pointer to streambuf and not just a streambuf? Well, the [io]streams hold pointers or references, depending on the implementation to their buffers, not the actual buffers. This allows polymorphic behavior on the chapter of the buffers as well as the streams themselves. The pointer is easily retrieved using the rdbuf member function.

Therefore, the easiest way to copy the file is:. I have seen instances where it is implemented, but the character extraction process removes all the whitespace, leaving you with no blank lines and only "Thequickbrownfox Others don't compile at all. This isn't going to try and be a complete tutorial on reading and writing binary files because "binary" covers a lot of ground , but we will try and clear up a couple of misconceptions and common errors.

There are other things that normal mode does, but that's the most obvious. Because ifstream and ofstream exist for the purpose of formatting , not reading and writing. This may or may not be what you want, see below. Notice how all the problems here are due to the inappropriate use of formatting functions and classes to perform something which requires that formatting not be done?

There are a seemingly infinite number of solutions, and a few are listed here:. This is a Bad Thing, because while the compiler would probably be just fine with it, other humans are going to be confused.

The overloaded bitshift operators have a well-defined meaning formatting , and this breaks it. Well, this is easy to make work, and easy to break, and is pretty equivalent to using:: While not trivial for the beginner, this is the best of all solutions.

How to go about using streambufs is a bit beyond the scope of this document at least for now , but while streambufs go a long way, they still leave a couple of things up to you, the programmer. As an example, byte ordering is completely between you and the operating system, and you have to handle it yourself.

Deriving a streambuf or filebuf class from the standard ones, one that is specific to your data types or an abstraction thereof is probably a good idea, and lots of examples exist in journals and on Usenet. Using the standard filebufs directly either by declaring your own or by using the pointer returned from an fstream's rdbuf is certainly feasible as well.

One area that causes problems is trying to do bit-by-bit operations with filebufs. If you're trying to read or write a few bits at a time, you're going about it the wrong way. Another area of problems is opening text files in binary mode. Generally, binary mode is intended for binary files, and opening text files in binary mode means that you now have to deal with all of those end-of-line and end-of-file problems that we mentioned before. An instructive thread from comp.

The subject heading is "binary iostreams" on both comp. Briefly, the problems of byte ordering and type sizes mean that the unformatted functions like ostream:: Binary Input and Output.