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#define INCL_KBD
 
USHORT KbdRegister(pszModuleName, pszEntryName, fFunctions)
PSZ pszModuleName;    /* pointer to string for module name      */
PSZ pszEntryName;     /* pointer to string for entry-point name */
ULONG fFunctions;     /* function flags                         */
 
The KbdRegister function registers a Kbd subsystem for the specified logical
keyboard. The function temporarily replaces the specified default Kbd
functions with the functions in the specified module. Once KbdRegister
replaces a function, MS OS/2 passes any subsequent call to the replaced
function to a function in the given module. If a function is not replaced,
MS OS/2 continues to call the default Kbd function.
 
Parameter      Description
────────────────────────────────────────────────────────────────────────────
 
pszModuleName  Points to the null-terminated string that contains the name
               of the dynamic-link module that specifies the replacement
               Kbd functions. The string must be a valid filename.
 
pszEntryName   Points to the null-terminated string that contains the name
               of the dynamic-link entry-point function. For a full
               description, see the following "Comments" section.
 
fFunctions     Specifies the flags for the functions to be replaced. This
               parameter can be any combination of the following values:
 
               Value              Meaning
               ─────────────────────────────────────────────────────────────
               KR_KBDCHARIN       Replace KbdCharIn.
 
               KR_KBDPEEK         Replace KbdPeek.
 
               KR_KBDFLUSHBUFFER  Replace KbdFlushBuffer.
 
               KR_KBDGETSTATUS    Replace KbdGetStatus.
 
               KR_KBDSETSTATUS    Replace KbdSetStatus.
 
               KR_KBDSTRINGIN     Replace KbdStringIn.
 
               KR_KBDOPEN         Replace KbdOpen.
 
               KR_KBDCLOSE        Replace KbdClose.
 
               KR_KBDGETFOCUS     Replace KbdGetFocus.
 
               KR_KBDFREEFOCUS    Replace KbdFreeFocus.
 
               KR_KBDGETCP        Replace KbdGetCp.
 
               KR_KBDSETCP        Replace KbdSetCp.
 
               KR_KBDXLATE        Replace KbdXlate.
 
               KR_KBDSETCUSTXT    Replace KbdSetCustXt.
 
               KR_KBDGETHWID      Replace KbdGetHWID.
 
Return Value
 
The return value is zero if the function is successful. Otherwise, it is an
error value, which may be one of the following:
 
     ERROR_KBD_INVALID_ASCIIZ
     ERROR_KBD_INVALID_MASK
     ERROR_KBD_REGISTER
 
Comments
 
MS OS/2 passes a Kbd function to the given module by preparing the stack and
calling the function pointed to by the pszEntryName parameter. The specified
module must export the entry-point function name. The entry-point function
must check the function code on the stack to determine which function is
being requested and then pass control to the appropriate function in the
module. The entry-point function can then access any additional parameters
placed on the stack by the original call to KbdRegister.
 
Only one process in a screen group can use the KbdRegister function at any
given time. That is, only one process can replace Kbd functions at any given
time. The process can restore the default Kbd functions by calling the
KbdDeRegister function. A process can replace Kbd functions any number of
times, but only by first restoring the default functions and then
reregistering the new functions.
 
The entry-point function (FuncName) must have the following form:
 
SHORT FAR FuncName(selDataSeg, usReserved1, fFunction,
    ulReserved2, usParam1, usParam2, usParam3, usParam4,
    usParam5, usParam6)
SEL selDataSeg;
USHORT usReserved1;
USHORT fFunction;
ULONG ulReserved2;
USHORT usParam1;
USHORT usParam2;
USHORT usParam3;
USHORT usParam4;
USHORT usParam5;
USHORT usParam6;
 
Parameters         Description
────────────────────────────────────────────────────────────────────────────
selDataSeg         Specifies the data-segment selector of the process that
                   calls the specified Kbd function.
 
usReserved1        Specifies a reserved value that must not be changed. This
                   value represents a return address for the MS OS/2
                   function that routes Kbd function calls.
 
fFunction          Specifies the function code of the function request. This
                   parameter can be one of the following values:
 
                   Value   Meaning
                   ─────────────────────────────────────────────────────────
                   0x0000  KbdCharIn called.
 
                   0x0001  KbdPeek called.
 
                   0x0002  KbdFlushBuffer called.
 
                   0x0003  KbdGetStatus called.
 
                   0x0004  KbdSetStatus called.
 
                   0x0005  KbdStringIn called.
 
                   0x0006  KbdOpen called.
 
                   0x0007  KbdClose called.
 
                   0x0008  KbdGetFocus called.
 
                   0x0009  KbdFreeFocus called.
 
                   0x000A  KbdGetCp called.
 
                   0x000B  KbdSetCp called.
 
                   0x000C  KbdXlate called.
 
                   0x000D  KbdSetCustXt called.
 
                   0x000E  KbdGetHWID called.
 
ulReserved2        Specifies a reserved value that must not be changed. This
                   value represents the return address of the program that
                   calls the specified Kbd function.
 
usParam1-usParam6  Specify up to six unsigned values passed with the call to
                   the Kbd function. The number and type of parameters used
                   depend on the specific function.
 
The entry-point function should determine which function is requested and
then carry out an appropriate action by using the passed parameters. If
necessary, the entry-point function can call a function within the same
module to carry out the task. The entry-point or replacement function must
leave the stack in the same state as it was received because the return
addresses on the stack must be available in the correct order to return
control to the program that originally called the KbdRegister function.
 
The registered function should return -1 to call the original function, 0 if
no error occurred, or an error value.
 
In general, to access the keyboard the replacement function must use the
input-and-output control functions for the keyboard.
 
The KbdRegister function itself cannot be replaced.
 
See Also
 
KbdDeRegister, KbdFlushBuffer
 
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