WriteFile/ReadFile repeat last lines

[sawer]

Hi

	do
	{
		bReadSuccess = ReadFile( hFile, strBuffer, sizeof(strBuffer), &nRead, NULL);
		bWriteSuccess = WriteFile( hFile2, strBuffer, sizeof(strBuffer), &nWrite, NULL);
	}while(bReadSuccess && bWriteSuccess && (nRead > 0));

a.txt's last line is:
315614,05r re regf

b.txt's last lines are:
315614,05r re regf
315614,05r re regf
315614,05r re

What is wrong with that loop?
Thanks.