No se trata de una función de la API de Windows si no una función de delphi:
Cita:
Writes the contents of a buffer to the current position in a file.
Unit
SysUtils
Category
file management routines
Delphi syntax:
function FileWrite(Handle: Integer; const Buffer; Count: Integer): Integer;
C++ syntax:
extern PACKAGE int __fastcall FileWrite(int Handle, const void *Buffer, unsigned Count);
Description
FileWrite writes Count bytes to the file given by Handle from the buffer specified by Buffer. Handle is a file handle returned by the FileOpen or FileCreate method.
The return value is the number of bytes actually written, or -1 if an error occurred.
: Do not mix routines that take or return file handles with those that use Delphi language file variables (typically seen as var F). To write to a file specified by a Delphi file variable, use Write, Writeln, or BlockWrite instead.
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Saludos.