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The old contents are not being wiped out.
Instead the data is being written over, so I still see old contents.
What did I not do?
hFile = CreateFile(fname, // open testfile.txt
GENERIC_WRITE, // open for reading
0, // do not share
NULL, // default security
OPEN_ALWAYS, //
FILE_ATTRIBUTE_NORMAL, // normal file
NULL); // no attribute template
dwBytesToWrite = buff.GetLength();
WriteFile(hFile, buff.GetBuffer(100), dwBytesToWrite, &dwBytesWritten, NULL);
You have specified the wrong value for
dwCreationDisposition. You need to specifyCREATE_ALWAYS.