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.
BIT REGISTERED FUNCTION BIT REGISTERED FUNCTION 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.
- rc (USHORT) - return
- Return code descriptions are:
- 0 NO_ERROR
- 349 ERROR_VIO_INVALID_MASK
- 403 ERROR_VIO_INVALID_ASCIIZ
- 426 ERROR_VIO_REGISTER
- 494 ERROR_VIO_EXTENDED_SG
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