追加写入txt

打开文件的时候这么写：

CStdioFile file(_T("DEMO.txt"), CFile::modeWrite | CFile::modeCreate | CFile::typeText | CFile::modeNoTruncate);

重点在CFile::modeNoTruncate，加上这么一句话就可以了。

例子：

CStdioFile file(_T("DEMO.txt"), CFile::modeWrite | CFile::modeCreate | CFile::typeText | CFile::modeNoTruncate);

file.Seek(0L, CFile::end);

ULONGLONG ullEnd = file.SeekToEnd();

file.WriteString(usedTime);

file.Close();

用两遍就发现实现了追加