calcExpress completeExtension ConvertFromWideString ConvertToWideString copyTo createDirectories createDirectory deleteDirectory deleteDirectoryRecursive deleteFile dirPath eraseVectorMinDistance exists extension FileInfo FileInfo FileName fileName fileNamePure filePath FontInfoVec gb2312ToUnicode gb2312ToUtf8 gb2312ToUtf8 GbkToUtf8 getDirectoryContent getFontFileInfo getFontWidth getNormalFontWidth getTempFileName getTempPath hasExtension isChinese isDigit isDir isFile isLetter isReadable isSymbol isWritable lastModified lastRead pathToString Permissions renameFile setFile setFile setPermissions size string2wstring stringToPath toStdWString unicodeToUTF8 utf8ToGB2312 wstring2string

isDir() bool isDir ( ) const Checks if it is a directory (not a file)