环境：Qt 5.14.0 + macOS Catalina 10.15.2
读取文件
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QFile* configFile = new QFile();
configFile->setFileName(str+"/.blogPosition.cfg");
// 读取配置
bool openFlag = configFile->open(QIODevice::ReadOnly | QIODevice::Text);
if (!openFlag){
return;
} else {
QTextStream textStream(configFile);
QString leastFolder = textStream.readLine();
ui->BlogPositionEdit->setText(leastFolder);
}
configFile->close();
写入文件
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QString str=QDir::homePath();
QFile* configFile = new QFile();
configFile->setFileName(str+"/.blogPosition.cfg");
// 写入配置
bool openFlag = configFile->open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Truncate);
if (!openFlag){
return -1;
} else {
QTextStream textStream(configFile);
textStream << pos;
}
configFile->close();
其中，QIODevice::Truncate为删除原内容写入，改为QIODevice::append即为追加写入
