VARPTR

From QB64 Phoenix Edition Wiki
Revision as of 01:20, 29 January 2023 by RhoSigma (talk | contribs)
Jump to navigation Jump to search

The VARPTR function returns an INTEGER value that is the offset part of the variable or array memory address within it's segment.


Syntax

offset% = VARPTR(variable_name[(reference_index%)])


  • If variablename is not defined before VARPTR or VARSEG is called, the variable is created and it's address is returned.
  • Reference index is used to set the offset address of an array index, not necessarily the lowest index.
  • When a string variable, VARPTR returns the offset address location of the first byte of the string.
  • Because many QBasic statements change the locations of variables in memory, use the values returned by VARPTR and VARSEG immediately after the functions are used!
  • Integer array sizes are limited to 32767 elements when using VARPTR in QB and QB64!. Create a larger array using _BYTE. Example: DIM SHARED Memory (65535) AS _UNSIGNED _BYTE
  • Warning: DEF SEG, VARSEG , VARPTR, PEEK or POKE access QB64's emulated 16 bit conventional memory block!
It is highly recommended that QB64's _MEM memory system be used to avoid running out of memory.


See also



Navigation:
Main Page with Articles and Tutorials
Keyword Reference - Alphabetical
Keyword Reference - By usage
Report a broken link