This call returns the mode of the display.
VioGetMode (ModeData, VioHandle)
ModeData (PVIOMODEINFO) - input/output Far address of a structure where mode characteristics are returned.
length (USHORT) Input parameter to VioGetMode. Length specifies the length of the data structure in bytes including length itself. The value specified on input controls the amount of mode data returned. The minimum structure size required is 2 bytes, and the maximum structure size required is 34 bytes. For OS/2 1.2, a length of 2 returns the size of the maximum structure required for all the mode data. When length is not equal to 2, the length field is modified on output to reflect the actual number of bytes returned.
type (UCHAR) Mode characteristics bit mask:
| Bit | Description |
|---|---|
| 7-4 | Reserved |
| 3 | 0 = VGA-compatible modes 0 thru 13H |
| 1 = Native mode | |
| 2 | 0 = Enable color burst |
| 1 = Disable color burst | |
| 1 | 0 = Text mode |
| 1 = Graphics mode | |
| 0 | 0 = Monochrome compatible mode |
| 1 = Other. |
numcolors (UCHAR) Number of colors defined as a power of 2. This is equivalent to the number of color bits that define the color, for example:
| Value | Definition |
|---|---|
| 0 | Monochrome modes 7, 7+, and F. |
| 1 | 2 colors |
| 2 | 4 colors |
| 4 | 16 colors |
| 8 | 256 colors |
textcols (USHORT) Number of text columns.
textrows (USHORT) Number of text rows.
pelcols (USHORT) Horizontal resolution, number of pel columns.
pelrows (USHORT) Vertical resolution, number of pel rows.
Attribute Format (UCHAR) Format of the attributes.
Number of Attributes (UCHAR) Number of attributes in a character cell.
Buffer Address (ULONG) 32-bit physical address of the physical display buffer for this mode.
Buffer Length (ULONG) Length of the physical display buffer for this mode.
Full Buffer Size (ULONG) Size of the buffer required for a full save of the physical display buffer for this mode.
Partial Buffer Size (ULONG) Size of the buffer required for a partial (pop-up) save of the physical display buffer for this mode.
Extended Data Area Address (PCH) Far address to an extended mode data structure or zero if none. The format of the extended mode data structure is determined by the device driver and is unknown to OS/2.
VioHandle (HVIO) - input Reserved word of 0s.
rc (USHORT) - return Return code descriptions are:
| 0 | NO_ERROR |
| 436 | ERROR_VIO_INVALID_HANDLE |
| 438 | ERROR_VIO_INVALID_LENGTH |
| 465 | ERROR_VIO_DETACHED |
| 494 | ERROR_VIO_EXTENDED_SG |
Remarks
Refer to VioSetMode for examples.
typedef struct _VIOMODEINFO { USHORT cb; /* Length of the entire data structure */ UCHAR fbType; /* Bit mask of mode being set */ UCHAR color; /* Number of colors (power of 2) */ USHORT col; /* Number of text columns */ USHORT row; /* Number of text rows */ USHORT hres; /* Horizontal resolution */ USHORT vres; /* Vertical resolution */ UCHAR fmt_ID; /* Attribute format */ UCHAR attrib; /* Number of attributes */ ULONG buf_addr; ULONG buf_length; ULONG full_length; ULONG partial_length; PCH ext_data_addr; } VIOMODEINFO; typedef VIOMODEINFO far *PVIOMODEINFO; #define INCL_VIO USHORT rc = VioGetMode(ModeData, VioHandle); PVIOMODEINFO ModeData; /* Mode characteristics */ HVIO VioHandle; /* Vio handle */ USHORT rc; /* return code */
VIOMODEINFO struc viomi_cb dw ? ;Length of the entire data structure viomi_fbType db ? ;Bit mask of mode being set viomi_color db ? ;Number of colors (power of 2) viomi_col dw ? ;Number of text columns viomi_row dw ? ;Number of text rows viomi_hres dw ? ;Horizontal resolution viomi_vres dw ? ;Vertical resolution viomi_fmt_ID db ? ;Attribute format viomi_attrib db ? ;Number of attributes viomi_buf_addr dd ? ; viomi_buf_length dd ? ; viomi_full_length dd ? ; viomi_partial_length dd ? ; viomi_ext_data_addr dd ? ; VIOMODEINFO ends EXTRN VioGetMode:FAR INCL_VIO EQU 1 PUSH@ OTHER ModeData ;Mode characteristics PUSH WORD VioHandle ;Vio handle CALL VioGetMode Return WORD