I'm using ifstream::read
to read a file,
ifstream ifs("a.txt");
char buf[1024];
ifs.read(buf, 1024);
But a.txt's size might be less than 1000 bytes
, so how am I supposed to know how many bytes have been read from ifs
?
You can get the amount of characters extracted by the last operation with std::ifstream::gcount
:
ifstream ifs("a.txt");
char buf[1024];
ifs.read(buf, 1024);
size_t extracted = ifs.gcount();
or
ifstream ifs("a.txt");
char buf[1024];
size_t extracted = ifs.read(buf, 1024).gcount();
since read(...)
returns *this
.
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