Zero-based strings (Delphi)
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Type |
Switch |
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Syntax |
{$ZEROBASEDSTRINGS ON} or {$ZEROBASEDSTRINGS OFF} |
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Default |
{$ZEROBASEDSTRINGS ON} for Delphi mobile compilers |
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Scope |
Local |
Remarks
{$ZEROBASEDSTRINGS} controls the indexing used locally for string types:
- {$ZEROBASEDSTRINGS OFF} is the default for the Delphi desktop compilers (DCC32, DCC64, DCCOSX, DCCLINUX64), which use 1-based indexing for strings.
- $ZEROBASEDSTRINGS ON} is the default for the Delphi mobile compilers (DCCIOSARM, DCCIOS32), which use 0-based indexing for strings.
- Caution: You can use {$ZEROBASEDSTRINGS} to change the local string indexing scheme. For example, in a Delphi application for mobile platforms, you can define {$ZEROBASEDSTRINGS OFF} to change to 1-based string indexing.
For example, {$ZEROBASEDSTRINGS} is useful if you have an isolated instance of in-place string editing that you cannot revise at the moment.
However, the mobile compilers and the RTL for the Delphi mobile use 0-based strings by default, so you must use 0-based strings when you are using the RTL in Delphi applications for mobile platforms.
Do not define {$ZEROBASEDSTRINGS} in mobile code larger than a snippet. Results would be unpredictable for an entire module or application for mobile platforms.
- Caution: You can use {$ZEROBASEDSTRINGS} to change the local string indexing scheme. For example, in a Delphi application for mobile platforms, you can define {$ZEROBASEDSTRINGS OFF} to change to 1-based string indexing.