WriteFile

Writes bytes to a file or I/O device.

Module: Windows

Microsoft documentation: WriteFile

Signature

func WriteFile(file: *opaque, buffer: *const opaque,
    bytesToWrite: uint32, bytesWritten: *uint32,
    overlapped: *opaque) -> bool32;

Parameters

Name	Description
file	Open writable handle.
buffer	Source buffer.
bytesToWrite	Requested byte count.
bytesWritten	Receives the actual count for synchronous I/O.
overlapped	Overlapped state, or null for synchronous I/O.

Returns

bool32 — nonzero on completed success or zero on failure/pending overlapped I/O. A successful device write can report fewer bytes than requested.

See also

• ReadFile — read bytes
• File I/O — file API overview