485
edits
Make your applications work in DataFlex NextGen: Difference between revisions
Make your applications work in DataFlex NextGen (view source)
Revision as of 19:15, 27 August 2020
, 27 August 2020→Calling conventions
(Created page with "= Document scope and public resources = This is a document that is Work In Progress as it is based on information shared by Data Access in public. The scope of this document i...") |
|||
| (4 intermediate revisions by 2 users not shown) | |||
| Line 6: | Line 6: | ||
* [https://learning.dataaccess.com/courses/synergy-2019/getting-your-applications-ready-for-dataflex-nextgen/ Getting your applications ready for DataFlex NextGen by Stephen Meeley at Synergy 2019] | * [https://learning.dataaccess.com/courses/synergy-2019/getting-your-applications-ready-for-dataflex-nextgen/ Getting your applications ready for DataFlex NextGen by Stephen Meeley at Synergy 2019] | ||
* [https://learning.dataaccess.com/courses/synergy-2019/dataflex-nextgen/ DataFlex NextGen by Harm Wibier at Synergy 2019] | * [https://learning.dataaccess.com/courses/synergy-2019/dataflex-nextgen/ DataFlex NextGen by Harm Wibier at Synergy 2019] | ||
Also read the following in the documentation: | |||
* [https://docs.dataaccess.com/dataflexhelp/#t=mergedProjects/Welcome/Language_and_Code_Cleanup.htm DataFlex Help - Language and Code Cleanup] | |||
As indicated there, things ''might'' still change. | As indicated there, things ''might'' still change. | ||
| Line 89: | Line 92: | ||
There's an alias for LongPtr in DataFlex 19.1 | There's an alias for LongPtr in DataFlex 19.1 | ||
=== Calling conventions === | |||
In DataFlex 20 you should use the following calling conventions for your external DLLs | |||
* 32 bit: stdcall | |||
* 64 bit: fastcall | |||
See also: [https://renenyffenegger.ch/notes/development/languages/C-C-plus-plus/calling-convention Calling conventions] | |||
The DF20 runtime uses the library [https://en.wikipedia.org/wiki/Libffi libffi] to make the call. | |||
It is possible that for 32 bit the cdecl calling convention also works now, but it has so far only seen limited testing. | |||
= Unicode Support = | = Unicode Support = | ||
| Line 137: | Line 152: | ||
Bytes are not code points, one character can take up to 4 bytes. | Bytes are not code points, one character can take up to 4 bytes. | ||
[[Category:How To]] | |||
[[Category:Tutorials]] | |||