开始从文件读取时，QTextStream atEnd（）返回true(QTextStream atEnd() is returning true when starting to read from

开始从文件读取时，QTextStream atEnd（）返回true(QTextStream atEnd() is returning true when starting to read from a file)

我想在linux机器上读取和解析/ proc / PID / status文件的内容，但是QTextStream.atEnd在开始读取时总是返回true。 代码：

QString procDirectory = "/proc/"; procDirectory.append(QString::number(PID)); procDirectory.append("/status"); QFile inputFile(procDirectory); if (inputFile.open(QIODevice::ReadOnly)) { QTextStream in(&inputFile); QString line; while (!in.atEnd()) { line = in.readLine();

文件存在，如果我在没有while表达式的情况下手动读取行，则会正常读取文件。

我错过了一些明显的东西吗

（Debian 8 x64，QT 5.4.1 x64，gcc 4.9.2）

I want to read and parse contents of the /proc/PID/status file on a linux machine, but the QTextStream.atEnd is always returning true when starting to read. The code:

QString procDirectory = "/proc/"; procDirectory.append(QString::number(PID)); procDirectory.append("/status"); QFile inputFile(procDirectory); if (inputFile.open(QIODevice::ReadOnly)) { QTextStream in(&inputFile); QString line; while (!in.atEnd()) { line = in.readLine();

File exists and if I read lines manually without the while expression, the files are read normally.

Did I miss something obvious?

(Debian 8 x64, QT 5.4.1 x64, gcc 4.9.2)

最满意答案

循环遍历这些流的首选方法是使用do / while循环。 这是为了允许流在进行任何查询（如atEnd）之前正确检测Unicode。

QTextStream stream(stdin); QString line; do { line = stream.readLine(); } while (!line.isNull());

The preferred way oft looping over these streams is with a do/while loop. This is for allowing the stream to detect Unicode correctly before any queries (like atEnd) are made.

QTextStream stream(stdin); QString line; do { line = stream.readLine(); } while (!line.isNull());