windows 新行未写入文件（Qt）
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New Line not being written on file (Qt)
提问by Maxes
i am keeping a log of activities in my software using qtextedit. later when i want to save it as a text using toPlainText(), the resulting text file is a single line without any line breaks. I start logging by plainText() and add subsequent additions using append().
我正在使用 qtextedit 在我的软件中记录活动日志。稍后当我想使用 toPlainText() 将其保存为文本时，生成的文本文件是一行，没有任何换行符。我从plainText() 开始记录并使用append() 添加后续添加项。
void rocketscience::saveLog(){
QFile logFile;
QTextStream logOut;
QString logfName;
QSettings prevSet("us","fr");
if (defaultDir.exists(prevSet.value("settings/logPath").toString()))
logfName= QFileDialog::getSaveFileName(this,"Save File",fName,"Text (*.txt");
if (logfName!=NULL){
logFile.setFileName(logfName);
logFile.open(QIODevice::WriteOnly);
logOut.setDevice(&logFile);
logOut<<ui.statusReport->toPlainText();
logFile.close();
}
}
}
采纳答案by Tim Meyer
From the QTextStream class reference (that line is a bit hidden):
从 QTextStream 类参考（该行有点隐藏）：
Note: On Windows, all '\n' characters are written as '\r\n' if QTextStream's device or string is opened using the QIODevice::Text flag.
注意：在 Windows 上，如果使用 QIODevice::Text 标志打开 QTextStream 的设备或字符串，则所有 '\n' 字符都写为 '\r\n'。
where '\n' is the UNIX line ending and '\r\n' is the Windows line ending (CR/LF).
其中 '\n' 是 UNIX 行结尾，'\r\n' 是 Windows 行结尾 (CR/LF)。
Remove the QTextStream initialisation at the start of your method and change the if statement to this:
在方法开始时删除 QTextStream 初始化并将 if 语句更改为：
if (!logfName.isEmpty())
{
logFile.setFileName(logfName);
logFile.open(QIODevice::WriteOnly);
QTextStream logOut(&logFile, QIODevice::Text);
logOut<<ui.statusReport->toPlainText();
logFile.close();
}
Also note how I changed the if condition. logfName is by default set to "", I'm not sure if comparing to NULL will work. You're better off using the QString::isEmpty() function
还要注意我是如何改变 if 条件的。logfName 默认设置为 ""，我不确定与 NULL 比较是否有效。你最好使用 QString::isEmpty() 函数
回答by Frank Osterfeld
Probably the file is written using UNIX line endings? You should open the file in text, to get the local (Windows) line-endings:
该文件可能是使用 UNIX 行结尾编写的？您应该以文本形式打开文件，以获取本地 (Windows) 行结尾：
logFile.open(QIODevice::WriteOnly|QIODevice::Text);
回答by GTRONICK
I had the same issue. However, the solution given by @Tim Meyer, did not work for me. In the line:
我遇到过同样的问题。但是，@Tim Meyer 给出的解决方案对我不起作用。在行中：
QTextStream logOut(&logFile, QIODevice::Text);
An error is shown. So, I did the following and worked for QT5.8:
显示错误。所以，我做了以下工作并为 QT5.8 工作：
/**
* Method to save a text file.
* @param asFileName: Complete file path, including name and extension.
* @param asText: Text to be written in the file
* @return true if the save was successful, false otherwise.
*/
bool MainWindow::saveFile(QString asFileName, QString asText)
{
QFile file(asFileName);
if (!file.open(QIODevice::WriteOnly | QIODevice::Text)){
QMessageBox::critical(this,"Error","File could not be opened");
return false;
}
QTextStream out(&file);
out << asText;
file.close();
return true;
}
