Re: Using string correctly
Felix Bollenbeck <feboll@gmx.de> wrote:
Hi all,
I bet there is a more elegant (more OO-like) alternative to this C
like construct
char buff[255];
sprintf(buff,"out%03d.tif",i++);
writer->SetFileName(buff);
Can anybody point me to the right direction - Im new to C++
Regards,
Felix.
std::ostringstream os
os << "out" << std::setfill('0') << std::setw(3) << i++ << ".tif";
writer->SetFileName(os.str().c_str));
this is a C++ way. Since the string involved is 10 chars long it
should be sufficiently fast. but with a small string like this
and a C api for the string,
char buff[11]; // the string length + 1 == 11.
if(i < 1000)
{
sprintf(...);
writer->SetFileName(buf);
}
else throw some_error();
is probably more efficient and safe.
if you have snprintf() it is safer as there is no chance for a
buffer overrun, [not present in this example since we are creating
a fixed length string]
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