CFile::Open

[Richard Ripps]

i open an existing file with with a filesize of 100 bytes, write some
buffer, and then close the file. i do something like:
.
.
.
myFile.Open("test.txt",CFile::modeWrite | CFile::modetypeText |
CFile::shareExclusive);

myFile.write(buf,50);
myFile.Close();

when i open the file for read, it has my 50 bytes at the beginning of the
file, and the remaining 50 bytes is from the existing file.

why does this happen? why doesn't it write an eof after my 50 bytes and
truncate the file at 50?

any help is appreciated

[Sam Hobbs]

CFile::Open has many modes and flags. I would try a couple more to see what
I got.

"Richard Ripps" <r...@nycap.rr.com> wrote in message
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[Mehdi Mousavi]

There are 2 approaches:

1. Try the CFile::modeCreate flag, that directs it to create a new file. If
the file already exists, it is truncated to 0 length.

2. Try CFile::SetLength(DWORD dwNewLen); in this example,
myFile.SetLength(50);

HTH,
Mehdi
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