涉及函数三个：
CFile::Open
CFile::Read
CFile::Write
网上搜索“CFile 二进制”会得到大量示例。
BYTE value = 0x9H;
CFile out("aaa.txt", CFile::modeCreate | CFile::modeWrite);
CString outstring;
outstring.Format(_T("%02X", value);
out.Write(outstring, outstring.GetLength());
out.Close();
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