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ofstream::setbuf

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streambuf**setbuf(char*pch***,intnLength);**

Attaches the specified reserve area to the stream’s filebuf object.

Return Value

If the file is open and a buffer has already been allocated, the function returns NULL; otherwise it returns a pointer to the filebuf cast as a streambuf. The reserve area will not be released by the destructor.

Parameters

pch

A pointer to a previously allocated reserve area of length nLength. A NULL value indicates an unbuffered stream.

nLength

The length (in bytes) of the reserve area. A length of 0 indicates an unbuffered stream.

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