QSettings::value
时间: 2023-09-12 18:13:18 浏览: 95
QSettings::value() is a function in the Qt framework that returns the value associated with a given key in a QSettings object. When called, it takes in a QString representing the key for which the value is being requested, and an optional QVariant representing a default value to return if the key does not exist in the QSettings object.
For example, the following code snippet retrieves the value associated with the "username" key in a QSettings object:
```
QSettings settings("MyCompany", "MyApp");
QString username = settings.value("username", "").toString();
```
In this case, if the "username" key exists in the QSettings object, the variable `username` will be set to its value. If the key does not exist, the default value of an empty string will be returned and converted to a QString using `toString()`.
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