如何设置输入掩码和QValidator到QLineEdit一次在Qt？ [英] How to set Input Mask and QValidator to a QLineEdit at a time in Qt?

问题描述

我想要一个接受IP地址的行编辑。如果我给输入掩码：

I want a line edit which accepts an ip address. If I give input mask as:

ui->lineEdit->setInputMask("000.000.000.000");

它接受大于255的值。如果我给验证器，那么我们必须给一个点。）每三位数字后。

It is accepting values greater than 255. If I give a validator then we have to give a dot(.) after every three digits. What would the best way to handle it?

推荐答案

它接受大于255的值。 / p>

It is accepting value greater than 255.

当然，因为'0'表示 this ：

Absolutely, because '0' means this:

ASCII digit permitted but not required.

正如你所看到的，这不是你的一杯茶。至少有以下方法可以规避：

As you can see, this is not your cup of tea. There are at least the following ways to circumvent it:

• 编写自定义验证器

• Write a custom validator

使用regex

将输入拆分为四个条目，并自行验证每个条目，

Split the input into four entries and validate each entry on its own while still having visual delimiters between the entries.

正则表达式解决方案可能是快速的，但也是最难的IMHO：

The regex solution would be probably the quick, but also ugliest IMHO:

QString ipRange = "(?:[0-1]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])";
// You may want to use QRegularExpression for new code with Qt 5 (not mandatory).
QRegExp ipRegex ("^" + ipRange
                 + "\\." + ipRange
                 + "\\." + ipRange
                 + "\\." + ipRange + "$");
QRegExpValidator *ipValidator = new QRegExpValidator(ipRegex, this);
lineEdit->setValidator(ipValidator);

免责声明：这只会正确验证IP4地址，所以如果你需要未来。

Disclaimer: this will only validate IP4 addresses properly, so it will not work for IP6 should you need that in the future.

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