validation - QRegExp for IP Address of QlineEDit in QT -


how can validate qlineedit control when want enter ip address qlineedit control, control should allow ip address . don't allow alphabets ,characters except dot(.) parts should in range of 0-255

ip address contain 4 parts , must 3 dots(.): first part should contain 3 digits.(must) second part should contain min 1 digit , max 3 digits.. third part should contain min 1 digit , max 3 digits. 4 part should contain minimun 1 digit.

ex: 122.234.245.211 121.112.112.44 255.255.136.132 133.231.123.2 255.0.0.0 121.0.0.23

below address should not accept: should give errormessage box

ex: 24.253.321.422 442.445.552.444 23535.35.353.33 3532.333.332

you can make use of qregexpvalidator class. , regex this:

[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}

after use qlineedit::setvalidator () function set validator.

hope helps...


-

Comments

Post a Comment

Popular posts from this blog

amazon web services - S3 Pre-signed POST validate file type? -

i know it's possible put limit on file size content-length-range header. possible validate file type? https://docs.aws.amazon.com/amazons3/latest/dev/httppostforms.html#policyconditions i see there content-type header, if set say, audio/mp3 allow mp3 files , return error if file not mp3? i found previous question answers mention validating file size: s3 direct upload restricting file size , type you can specify content-type @ post request. you can specify @ signature, post must done content-type: { "expiration": "2007-12-01t12:00:00.000z", "conditions": [ {"acl": "public-read" }, {"bucket": "johnsmith" }, {"content-type: "audio/mp3"} ] } creating html form (using aws signature version 4) edit: @ previous question found, checking content-type.
Read more

c# - Check Keyboard Input Winforms -

i wondering if instead of doing this protected override void onkeydown(keyeventargs e) { if (e.keycode == keys.a) console.writeline("the key down."); } i set bool method , this: if(keydown(keys.a)) // whatever here i've been sitting here ages trying figure out how it. can't wrap head around it. in case wondering, plan call bool inside different method, check input. since want perform action after pressing key, using keydown event enough. but in cases suppose want check if specific key down in middle of process, can use getkeystate method way: [dllimport("user32.dll", charset = charset.auto, exactspelling = true)] public static extern short getkeystate(int keycode); public const int key_pressed = 0x8000; public static bool iskeydown(keys key) { return convert.toboolean(getkeystate((int)key) & key_pressed); } you should know, each time check key state using example iskeydown(keys.a) method returns true if ke...
Read more