Hi all,
we are trying to port a fairly large c++ library to windows using
Visual Studio.net 2003, and are running into some unexpected problems
with the stream handling. Since our development is more or less
Unix-based, I am afraid I am quite a novice to all Windows - specific
stuff, so please excuse my naive terminology. :-)
In our library, we have a string handling class, which contains the
following piece of code:
inline
std::istream& String::getline (std::istream& s, char delimiter)
throw()
{
static char line_buffer[8192];
s.getline(line_ buffer, 8191, delimiter);
set(line_buffer );
return s;
}
If I compile the library as a static .lib, and write a program using the
following code:
int main(int argc, char **argv)
{
std::ifstream f("bla", std::ios::in);
String line;
while (f.good())
{
line.getline(f) ;
std::cout << line << std::endl;
}
return 0;
}
everything works perfectly. But as soon as I compile the library as a dll,
f.good() does nothing. It always returns true, no matter where in the stream
I am. Leading, of course, to abnormal program termination since it reads one
line past the end. The same happens with f.eof(), f.fail(), or f.bad()
I have been told that strange things might happen if you compile the library
and the executable with different versions of the CRT, but as far as I can
see, both use the same: both compilations set a compiler swith /MD
Anyone got any idea what is happening here? And why it works when using a
static lib but not when using a dll?
Thanks a lot,
Andreas Hildebrandt
we are trying to port a fairly large c++ library to windows using
Visual Studio.net 2003, and are running into some unexpected problems
with the stream handling. Since our development is more or less
Unix-based, I am afraid I am quite a novice to all Windows - specific
stuff, so please excuse my naive terminology. :-)
In our library, we have a string handling class, which contains the
following piece of code:
inline
std::istream& String::getline (std::istream& s, char delimiter)
throw()
{
static char line_buffer[8192];
s.getline(line_ buffer, 8191, delimiter);
set(line_buffer );
return s;
}
If I compile the library as a static .lib, and write a program using the
following code:
int main(int argc, char **argv)
{
std::ifstream f("bla", std::ios::in);
String line;
while (f.good())
{
line.getline(f) ;
std::cout << line << std::endl;
}
return 0;
}
everything works perfectly. But as soon as I compile the library as a dll,
f.good() does nothing. It always returns true, no matter where in the stream
I am. Leading, of course, to abnormal program termination since it reads one
line past the end. The same happens with f.eof(), f.fail(), or f.bad()
I have been told that strange things might happen if you compile the library
and the executable with different versions of the CRT, but as far as I can
see, both use the same: both compilations set a compiler swith /MD
Anyone got any idea what is happening here? And why it works when using a
static lib but not when using a dll?
Thanks a lot,
Andreas Hildebrandt
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