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Table of Contents
This is part of Family API which allow to create dual-os version of program runs under OS/2 and DOS
Note: This is legacy API call. It is recommended to use 32-bit equivalent
This call releases ownership of (unlocks) the physical display buffer.
- VioHandle (HVIO) - input : Reserved word of 0s.
rc (USHORT) - return
Return code descriptions are:
- 0 NO_ERROR
- 367 ERROR_VIO_UNLOCK
- 430 ERROR_VIO_ILLEGAL_DURING_POPUP
- 436 ERROR_VIO_INVALID_HANDLE
- 465 ERROR_VIO_DETACHED
- 494 ERROR_VIO_EXTENDED_SG
This call releases the screen lock that is set by VioScrLock. The VioScrUnLock call must be issued by a thread in the same process as the thread that issued VioScrLock.
Family API Considerations
Some options operate differently in the DOS mode than in the OS/2 mode. Therefore, the following restriction applies to VioScrUnLock when coding in the DOS mode:
The status always indicates the unlock is successful (return code = 0).
#define INCL_VIO USHORT rc = VioScrUnLock(VioHandle); HVIO VioHandle; /* Video handle */ USHORT rc; /* return code */
EXTRN VioScrUnLock:FAR INCL_VIO EQU 1 PUSH WORD VioHandle ;Video handle CALL VioScrUnLock Returns WORD
Text based on http://www.edm2.com/index.php/VioScrUnLock_(FAPI)