open
Syntax:
#include <fstream> void open( const char *filename ); void open( const char *filename, openmode mode = default_mode );
The function open() is used with file streams. It opens filename and associates it with the current stream. The optional io_stream_mode_flag mode defaults to ios::in for ifstream, ios::out for ofstream, and ios::in|ios::out for fstream. If open() fails, the resulting stream will evaluate to false when used in a Boolean expression. For example:
ifstream inputStream; inputStream.open("file.txt"); if( !inputStream ) { cerr << "Error opening input stream" << endl; return; }
Related Topics: I/O Constructors, close, C++ I/O Mode Flags