en:docs:fapi:vioreadcharstr

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

2021/09/17 06:47 · prokushev
2021/08/20 05:18 · prokushev

VioReadCharStr

This call reads a string of characters from the display starting at the specified location.

Syntax

VioReadCharStr (CharStr, Length, Row, Column, VioHandle) 

Parameters

  • CharStr (PCH) - output : Address of the buffer where the character string is returned.
  • Length (PUSHORT) - input/output : Address of the buffer length in bytes.
  • Row (USHORT) - input : Starting row of the field to read, 0 is the top row.
  • Column (USHORT) - input : Starting column of the field to read, 0 is the leftmost column.
  • VioHandle (HVIO) - input : This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs.

Return Code

rc (USHORT) - return

Return code descriptions are:

  • 0 NO_ERROR
  • 355 ERROR_VIO_MODE
  • 358 ERROR_VIO_ROW
  • 359 ERROR_VIO_COL
  • 436 ERROR_VIO_INVALID_HANDLE
  • 465 ERROR_VIO_DETACHED

Remarks

If a string read comes to the end of the line and is not complete, then the string read continues at the beginning of the next line. If the read comes to the end of the screen and is not complete, the read terminates and the length is set to the number of characters read.

PM Considerations

VioReadCharStr reads a character string from the Advanced VIO presentation space starting at the specified location.

Bindings

C Binding

#define INCL_VIO
 
USHORT  rc = VioReadCharStr(CharStr, Length, Row, Column, VioHandle);
 
PCH              CharStr;       /* Character buffer */
PUSHORT          Length;        /* Length of buffer */
USHORT           Row;           /* Starting row location */
USHORT           Column;        /* Starting column location */
HVIO             VioHandle;     /* Video handle */
 
USHORT           rc;            /* return code */

MASM Binding

EXTRN  VioReadCharStr:FAR
INCL_VIO            EQU 1
 
PUSH@  OTHER   CharStr       ;Character buffer
PUSH@  WORD    Length        ;Length of buffer
PUSH   WORD    Row           ;Starting row location
PUSH   WORD    Column        ;Starting column location
PUSH   WORD    VioHandle     ;Video handle
CALL   VioReadCharStr
 
Returns WORD

Note


en/docs/fapi/vioreadcharstr.txt · Last modified: 2021/09/19 04:24 by prokushev