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Onscreen Keyboard

, 21 Mar 2000
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An onscreen keyboard for pen computing and touchscreens
  • Download source files - 143 Kb

    Sample Image - OnscreenKeyboard.gif

    I needed a simple onscreen keyboard to interface with a touch / pen based computer that I bought through an online auction. Although Microsoft supplies one with its Pen Extensions 2.0 it only works win Win95 and I wanted to use NT.

    All of the available onscreen keyboards I found were either too expensive, or they were only designed to operate with 3.1 and 9x so (of course) I decided to see if I could make one. Along the way I learned a little about how the keyboard is handled, and the thread keyboard maps.

    Included with this article is a working, but simple, onscreen keyboard. I submitted it mostly as an example of the methods:

    • AttachThreadInput
    • keybd_event
    • VkKeyScan
    • GetKeyState

    This program has one nasty limitation, and that is that it "flashes" since it does not prevent the changing of focus to itself when clicked, and then back to the target window when the keystroke is generated. If someone wants to tackle that one please feel free Wink | ;-)

  • License

    This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

    A list of licenses authors might use can be found here


    About the Author

    Randy More
    United States United States
    No Biography provided

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    Comments and Discussions

    Generalajka454 Pin
    ajka45426-Jan-14 23:00
    professionalajka45426-Jan-14 23:00 
    Questioncomments Pin
    graceman201217-Aug-12 20:28
    membergraceman201217-Aug-12 20:28 
    Questionsendkey is sometimes failing Pin
    Member 815507614-Aug-12 3:35
    memberMember 815507614-Aug-12 3:35 
    QuestionI need help to port web based G7 onscreen-keypad to Windows Native application. Pin
    Member 815507611-Aug-12 2:16
    memberMember 815507611-Aug-12 2:16 
    QuestionHealth Pin
    kate198321-Feb-12 2:48
    memberkate198321-Feb-12 2:48 
    QuestionGood sample Pin
    BaoSaka27-Jun-11 6:45
    memberBaoSaka27-Jun-11 6:45 
    GeneralMy vote of 5 Pin
    Chandru08021-Jun-11 21:01
    memberChandru08021-Jun-11 21:01 
    Very Nice article
    Generalcan't run the source code manually Pin
    noordiana21-Oct-10 5:38
    membernoordiana21-Oct-10 5:38 
    GeneralOn Screen Keyboard - Korean Pin
    Member 31486272-Mar-10 9:55
    memberMember 31486272-Mar-10 9:55 
    Questiononscreen keyboard Pin
    saranshs24-Oct-09 6:53
    membersaranshs24-Oct-09 6:53 
    QuestionChording-like Keyboard like Onscreen Keyboard Pin
    mike spano5-Mar-09 11:33
    membermike spano5-Mar-09 11:33 
    Generaldisabled keyboard Pin
    phantoms3316-Oct-08 16:42
    memberphantoms3316-Oct-08 16:42 
    QuestionFor Vb.NET 2005 .. 2.0 Pin
    ferozasi25-Mar-08 5:53
    memberferozasi25-Mar-08 5:53 
    GeneralTo stop flashing Pin
    Vibes8-May-07 19:04
    memberVibes8-May-07 19:04 
    GeneralRe: To stop flashing Pin
    cxcui5-Jun-07 10:28
    membercxcui5-Jun-07 10:28 
    GeneralRe: To stop flashing Pin
    Member 364201630-Jun-09 18:53
    memberMember 364201630-Jun-09 18:53 
    Questionvirtual keyboard using java Pin
    Member #37203626-Mar-07 7:47
    memberMember #37203626-Mar-07 7:47 
    AnswerRe: virtual keyboard using java Pin
    akash214713-Jul-10 3:41
    memberakash214713-Jul-10 3:41 
    QuestionDaniel Pin
    otaku191-Feb-07 23:56
    memberotaku191-Feb-07 23:56 
    QuestionI have a problem with the address bar Pin
    arrodenas4-Nov-06 11:35
    memberarrodenas4-Nov-06 11:35 
    AnswerRe: I have a problem with the address bar Pin
    storein20-Dec-06 0:57
    memberstorein20-Dec-06 0:57 
    GeneralRe: I have a problem with the address bar Pin
    arrodenas2-Jan-07 9:33
    memberarrodenas2-Jan-07 9:33 
    GeneralFixed the ESC key Pin
    cfo5ter5-Sep-06 13:31
    membercfo5ter5-Sep-06 13:31 
    GeneralRe: Fixed the ESC key Pin
    storein17-Dec-06 15:58
    memberstorein17-Dec-06 15:58 
    raeesa4-Sep-06 4:47
    memberraeesa4-Sep-06 4:47 
    brahmma9-May-07 8:55
    memberbrahmma9-May-07 8:55 
    QuestionCan we change initial size? Pin
    peterpecker10-Mar-06 6:43
    memberpeterpecker10-Mar-06 6:43 
    QuestionRe: Can we change initial size? Pin
    gidtitan21-Mar-07 11:06
    membergidtitan21-Mar-07 11:06 
    Generala better Onscreen Virtual keyboard Pin
    Ilanbm1-Mar-06 3:11
    memberIlanbm1-Mar-06 3:11 
    GeneralRe: a better Onscreen Virtual keyboard - Link Pin
    Ilanbm1-Mar-06 3:12
    memberIlanbm1-Mar-06 3:12 
    GeneralRe: a better Onscreen Virtual keyboard - Link Pin
    jmelgaard17-Jan-07 2:57
    memberjmelgaard17-Jan-07 2:57 
    GeneralTentative Enhancement Pin
    dickch20-Dec-05 14:19
    memberdickch20-Dec-05 14:19 
    QuestionRe: Tentative Enhancement Pin
    JYCiou5-Mar-06 15:20
    memberJYCiou5-Mar-06 15:20 
    QuestionRe: Tentative Enhancement Pin
    Homero De la Garza5-Aug-07 9:37
    memberHomero De la Garza5-Aug-07 9:37 
    GeneralRe: Tentative Enhancement Pin
    gidtitan21-Mar-07 11:07
    membergidtitan21-Mar-07 11:07 
    QuestionJapanese? Pin
    matsnas6-Dec-05 23:07
    membermatsnas6-Dec-05 23:07 
    GeneralTimer Pin
    simcon8-Jun-05 0:20
    susssimcon8-Jun-05 0:20 
    Generalexecute Pin
    Simon Potzkai30-May-05 0:58
    memberSimon Potzkai30-May-05 0:58 
    GeneralKill keyboard from another app Pin
    barnes1022@yahoo.com16-Feb-05 12:10
    memberbarnes1022@yahoo.com16-Feb-05 12:10 
    GeneralRe: Kill keyboard from another app Pin
    Dirk Moshage21-Feb-05 7:26
    memberDirk Moshage21-Feb-05 7:26 
    GeneralRe: Kill keyboard from another app Pin
    jbarnes102225-Feb-05 7:45
    memberjbarnes102225-Feb-05 7:45 
    GeneralUsing the Windows OSK Pin
    Alex Evans29-Jan-05 19:35
    memberAlex Evans29-Jan-05 19:35 
    GeneralRe: Using the Windows OSK Pin
    EjayBoy1-Aug-06 13:04
    memberEjayBoy1-Aug-06 13:04 
    GeneralRe: Using the Windows OSK Pin
    EjayBoy1-Aug-06 14:10
    memberEjayBoy1-Aug-06 14:10 
    GeneralDon't work on remote desktop logon window Pin
    yoslee20-Jan-05 22:11
    memberyoslee20-Jan-05 22:11 
    GeneralOnscreen Keyboard Internationalization Matter ... Pin
    Duranti Loris11-Jan-05 3:04
    sussDuranti Loris11-Jan-05 3:04 
    Generalabt OnScreen Keyboard Pin
    Tripura.K3-Dec-04 1:06
    memberTripura.K3-Dec-04 1:06 
    Generalabt OnScreen Keyboard Pin
    Anonymous2-Dec-04 23:31
    sussAnonymous2-Dec-04 23:31 
    GeneralCan't Compile Pin
    rajwsinder singh2-Dec-04 0:57
    memberrajwsinder singh2-Dec-04 0:57 
    GeneralRe: Can't Compile Pin
    EP70L-PGKDSG7-Dec-04 2:47
    memberEP70L-PGKDSG7-Dec-04 2:47 

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