Reading binary files in C++.

[Jason Heyes]

I tried to use this function to read a binary file. It only reads a few
thousand bytes and not the entire file. How do I change it to read a whole
binary file? Thanks in advance.

bool read_file(const char *fname, std::string &data)
{
std::ifstream in(fname);
if (!in.is_open())
return false;

std::stringstream ss;
if (!(ss << in.rdbuf()))
return false;

data = ss.str();
return true;
}

[Karl Heinz Buchegger]

Jason Heyes wrote:

I tried to use this function to read a binary file. It only reads a few
thousand bytes and not the entire file. How do I change it to read a whole
binary file? Thanks in advance.

bool read_file(const char *fname, std::string &data)
{
std::ifstream in(fname);
if (!in.is_open())
return false;

std::stringstream ss;
if (!(ss << in.rdbuf()))
return false;

data = ss.str();
return true;
}

OPen the file in binary mode.

--
Karl Heinz Buchegger
kb******@gascad.at

[Mike Wahler]

"Jason Heyes" <ja********@optusnet.com.au> wrote in message
news:43**********************@news.optusnet.com.au ...

I tried to use this function to read a binary file. It only reads a few
thousand bytes and not the entire file. How do I change it to read a whole
binary file? Thanks in advance.

bool read_file(const char *fname, std::string &data)
{
std::ifstream in(fname);
std::ifstream in(fname, std::ios::binary); /* needs #include <ios> */
if (!in.is_open())
return false;

std::stringstream ss;
if (!(ss << in.rdbuf()))
return false;

data = ss.str();
return true;
}

-Mike