istream::read
istream& read (char* s, streamsize n ); | istream |
cplusplus.com |
Read a block of data.
Reads a block of data of the length specified by n.
Data is read sequentially, so
if the End-Of-File is reached before the whole block could be
read the buffer will contain the elements read until End-Of-File.
Parameters.
Return Value.
The functions return *this
Example.
// read a file into memory #include <iostream> #include <fstream> using namespace std; int main () { int length; char * buffer; ifstream is; is.open ("test.txt", ios::binary ); // get length of file: is.seekg (0, ios::end); length = is.tellg(); is.seekg (0, ios::beg); // allocate memory: buffer = new char [length]; // read data as a block: is.read (buffer,length); is.close(); cout.write (buffer,length); return 0; }
Basic template member declaration ( basic_istream<charT,traits> ):
typedef charT char_type; basic_istream& read ( char_type* s, streamsize n ); |
See also.
get,
operator>>
istream class