QLineEdit::setInputMask(const QString &inputMask)方法可以使Edit控制元件只允許輸入自定義的格式字串，inputMask引數設定格式化字串的掩碼。

inputMask可以是下列字元的組合

Character	Meaning
A

ASCII alphabetic character required. A-Z, a-z.

a

ASCII alphabetic character permitted but not required.

N

ASCII alphanumeric character required. A-Z, a-z, 0-9.

n

ASCII alphanumeric character permitted but not required.

X

Any character required.

x

Any character permitted but not required.

9

ASCII digit required. 0-9.

0

ASCII digit permitted but not required.

D

ASCII digit required. 1-9.

d

ASCII digit permitted but not required (1-9).

#

ASCII digit or plus/minus sign permitted but not required.

H

Hexadecimal character required. A-F, a-f, 0-9.

h

Hexadecimal character permitted but not required.

B

Binary character required. 0-1.

b

Binary character permitted but not required.

>

All following alphabetic characters are uppercased.

<

All following alphabetic characters are lowercased.

!

Switch off case conversion.

\

Use \ to escape the special characters listed above to use them as separators.

 

示例：

“000.000.000.000;”是一個IP地址。

“HH:HH:HH:HH:HH:HH;0”是一個MAC地址。

“\\0\\xHHHH;0”是隻允許輸入一個16位的十六進位制數。

另外，一個很有用的技巧是組合使用QLineEdit::setInputMask和QLineEdit::setValidator可實現更復雜的輸入遮蔽和驗證。