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VioGlobalReg allows a subsystem to receive notification at the completion of VIO calls issued by all applications running in full-screen sessions.


VioGlobalReg (ModuleName, EntryPoint, FunctionMask1, FunctionMask2, 0)


ModuleName (PSZ) - input
Address of the ASCIIZ string containing the 1-8 character file name of the subsystem. The maximum length of the ASCIIZ string is 9 bytes including the terminating byte of zero. The module must be a dynamic link library but the name supplied must not include the .DLL extension.
EntryPoint (PSZ) - input
Address of the ASCIIZ name string containing the dynamic link entry point name of the routine in the subsystem to receive control when any of the registered functions is called. The maximum length of the ASCIIZ string is 33 bytes including the terminating byte of zero.
FunctionMask1 (ULONG) - input
A bit mask where each bit identifies a video function being registered. The bit definitions are shown below. The first word pushed onto the stack contains the high-order 16 bits of the function mask, and the second word contains the low-order 16 bits.
31 VioPrtScToggle 15 VioWrtCharStr
30 VioEndPopUp 14 VioWrtTTY
29 VioPopUp 13 VioWrtNCell
28 VioSavRedrawUndo 12 VioWrtNAttr
27 VioSavRedrawWait 11 VioWrtNChar
26 VioScrUnLock 10 VioReadCellStr
25 VioScrLock 9 VioReadCharStr
24 VioPrtSc 8 VioShowBuf
23 VioGetAnsi 7 VioSetMode
22 VioSetAnsi 6 VioSetCurType
21 VioScrollRt 5 VioSetCurPos
20 VioScrollLf 4 VioGetPhysBuf
19 VioScrollDn 3 VioGetBuf
18 VioScrollUp 2 VioGetMode
17 VioWrtCellStr 1 VioGetCurType
16 VioWrtCharStrAtt 0 VioGetCurPos
FunctionMask2 (ULONG) - input
A bit mask where each bit identifies a video function being registered. The bit mask has the format shown below. The first word pushed onto the stack contains the high order 16 bits of the function mask, and the second word contains the low order 16 bits. Unused bits are reserved and must be set to zero.
31-11 Reserved, must be set to zero.
10    VioDeRegister
9     VioRegister
8     VioSetState
7     VioGetState
6     VioSetFont
5     VioGetCp
4     VioSetCp
3     VioGetConfig
2     VioGetFont
1     VioModeUndo
0     VioModeWait
Reserved (LONG) - input
Reserved and must be zero.

Return Code

rc (USHORT) - return
Return code descriptions are:
  • 0 NO_ERROR


Notification of VIO calls issued within the hard error handler and DOS (real mode) sessions is not provided.

When control is routed to EntryPoint, the stack appears as it did after the original VIO call except that four additional values have been pushed onto the stack. The first is the index number (WORD) of the routine called. The second is a near pointer (WORD). The third is the caller's DS register (WORD). The fourth is the return address (DWORD) to the VIO router.

For example, if VioSetCurPos were a registered function, the stack would appear as if the following instruction sequence were executed if VioSetCurPos were called and control routed to EntryPoint:

PUSH     WORD     Row
PUSH     WORD     Column
PUSH     WORD     VioHandle
CALL     FAR      VioSetCurPos
PUSH     WORD     Index
CALL     NEAR     Entry point in Vio router
PUSH     WORD     Caller's DS
CALL     FAR      Dynamic link entry point

The index numbers that correspond to the registered functions are listed below:

 VioGetPhysBuf    22 VioSetAnsi       1
 VioGetBuf        23 VioGetAnsi       2
 VioShowBuf       24 VioPrtSc         3
 VioGetCurPos     25 VioScrLock       4
 VioGetCurType    26 VioScrUnLock     5
 VioGetMode       27 VioSavRedrawWait 6
 VioSetCurPos     28 VioSavRedrawUndo 7
 VioSetCurType    29 VioPopUp         8
 VioSetMode       30 VioEndPopUp      9
 VioReadCharStr   31 VioPrtScToggle  10
 VioReadCellStr   32 VioModeWait     11
 VioWrtNChar      33 VioModeUndo     12
 VioWrtNAttr      34 VioGetFont      13
 VioWrtNCell      35 VioGetConfig    14
 VioWrtCharStr    36 VioSetCp        15
 VioWrtCharStrAtt 37 VioGetCp        16
 VioWrtCellStr    38 VioSetFont      17
 VioWrtTTY        39 VioGetState     18
 VioScrollUp      40 VioSetState     19
 VioScrollDn      41 VioRegister     20
 VioScrollLf      42 VioDeRegister   21
 VioScrollRt      43

On entry to the global subsystem, AX contains the return code that is returned to the application that issued the VIO call. The global subsystem must return with all stack parameters and all general purpose registers, including AX, restored to the same values as on entry.

All VIO functions within a session are serialized on a thread basis. That is, when a global subsystem receives control, it can safely assume that it is not called again from the same session until the current call has completed. Note, however, that VIO calls across different sessions are not serialized.

VioGlobalReg may only be issued during system initialization. After system initialization, VioGlobalReg returns ERROR_VIO_REGISTER. A globally registered subsystem is active for the life of the system.

If multiple global subsystems are registered, they are given control in the order that they are registered.

A globally registered subsystem receives control on VIO calls issued from all full-screen sessions except the hard error handler and DOS (real mode) sessions.



#define INCL_VIO

USHORT  rc = VioGlobalReg(ModuleName, EntryPoint, FunctionMask1,
                           FunctionMask2, 0);

PSZ     ModuleName;    /* Module name  */
PSZ     EntryPoint;    /* Entry point name */
ULONG   FunctionMask1; /* Function mask 1  */
ULONG   FunctionMask2; /* Function mask 2  */
LONG    0;             /* Reserved (must be zero) */

USHORT  rc;            /* return code */


EXTRN VioGlobalReg:FAR
INCL_VIO            EQU 1

PUSH@ ASCIIZ ModuleName      ;Module name
PUSH@ ASCIIZ EntryPoint      ;Entry point name
PUSH  DWORD  FunctionMask1   ;Function mask 1
PUSH  DWORD  FunctionMask2   ;Function mask 2
PUSH  DWORD  0               ;Reserved (must be zero)
CALL  VioGlobalReg

Returns WORD