std::basic_ostream::write

 

C++

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Technical Specifications

 

Input/output library

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basic_streambuf

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streamoff

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std::basic_ostream

Global objects
coutwcout	cerrwcerr	clogwclog
Member functions
basic_ostream::basic_ostream
basic_ostream::~basic_ostream
basic_ostream::operator= (C++11)
Formatted output
basic_ostream::operator<<
Unformatted output
basic_ostream::put
basic_ostream::write
Positioning
basic_ostream::tellp
basic_ostream::seekp
Miscellaneous
basic_ostream::flush
basic_ostream::swap (C++11)
Member classes
basic_ostream::sentry
Non-member functions
operator<<(std::basic_ostream)

 

basic_ostream& write( const char_type* s, std::streamsize count );

Behaves as an UnformattedOutputFunction. After constructing and checking the sentry object, outputs the characters from successive locations in the character array whose first element is pointed to by s. Characters are inserted into the output sequence until one of the following occurs:

• exactly count characters are inserted
• inserting into the output sequence fails (in which case setstate(badbit) is called)

Parameters

s	-	pointer to the character string to write
count	-	number of characters to write

Return value

*this

Notes

This function is not overloaded for the types signed char or unsigned char, unlike the formatted operator<<

Also, unlike the formatted output functions, this function does not set the failbit on failure.

Exceptions

If an exception occurs during output and exceptions() & badbit != 0, rethrows that exception.

If output fails and exceptions() & badbit != 0, throws ios_base::failure.

Example

This function may be used to output object representations, i.e. binary output

Run this code

#include <iostream>
 
int main()
{
    int n = 0x41424344;
    std::cout.write(reinterpret_cast<char*>(&n), sizeof n) << '\n';
 
    char c[]="This is sample text.";
    std::cout.write(c,4)<<'\n';
}

Possible output:

DCBA
This

See also

operator<<(std::basic_ostream)	inserts character data (function template)
put	inserts a character (public member function)