WriteFile lpNumberOfBytesWritten less than nNumberOfBytesToWrite

Question

When called, WriteFilecan the returned one lpNumberOfBytesWrittenbe smaller nNumberOfBytesToWritein synchronous recording mode, where the error was not executed (return is TRUE)? Writing is done to a file (not a socket, pipe, or other special descriptor). lpOverlappednot used.

This is not entirely clear from the docs .

Answer 1

The documentation states:

The WriteFile function returns when one of the following conditions occurs:

• The number of bytes requested is recorded.
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, , . *lpNumberOfBytesWritten nNumberOfBytesToWrite, , , .