Using C in Swift

While programming in Swift, sometime it is necessary to deal with C libraries. This presentation will give you quick overview of how to use C library from your swift apps, and/or swift frameworks. [swift3]

Transcript

1. Using C in swift Kaz Yoshikawa
2. About me
3. Kaz Yoshikawa • Electricwoods LLC ୅ද / Digital Lynx Systems Inc. ෭୅ද • e-mail: kaz@digitallynx.com • twitter: @codelynx1 • Working History • Adobe Systems (Tokyo) • Lionbridge (Tokyo) • Quark (Tokyo / Denver) • Hummingbird Communications (Mt. View, USA) • Fact International (Vancouver, Canada) • Perle Systems (Toronto, Canada), etc.
4. Using C Library
5. Using C in Swift • SQLite • OpenSSL • zlib • libxml2 • mysqllib • libetpan • commonCrypto
6. Using C library in 
 your swift app case: 'sqlite3'
7. Create Bridging Header
8. Adding Any ObjC Classes
9. Create Bridging Header
10. Bridging Header
11. Don't forget adding 
 C libraries
12. The code…
13. Yah!! !
14. Using C Libraries in your swift Framework
15. There are some problems…
16. Bridging Header 
 cannot be used
 for Frameworks "
17. # Then what should I do?
18. Using Module Map $
19. What is module map? Module maps
 
 Module maps are specified as separate files (each named module.modulemap) alongside the headers they describe, which allows them to be added to existing software libraries without having to change the library headers themselves. http://clang.llvm.org/docs/Modules.html#module-maps
20. Creating a folder
21. sqlite.h build for both simulator and device
22. Header Search Paths
23. Import Paths
24. Now you can use C identifiers in swift code JNQPSU
    6*,JU
    JNQPSU
    TRMJUF
    QVCMJD
    DMBTT
    5FTU4RMJUF@J04
    /40CKFDU
    \
    
    QVCMJD
    DMBTT
    GVOD
    UFTU
    \
    
    
    MFU
    GJMFQBUI
    
    /45FNQPSBSZ%JSFDUPSZ
    BT
    /44USJOH BQQFOEJOH1BUI$PNQPOFOU UFTUTRMJUF
    
    
    WBS
    EC
    0QBRVF1PJOUFS
    
    OJM
    
    
    MFU
    TUBUVT
    
    TRMJUF@PQFO@W GJMFQBUI
    EC
    42-*5&@01&/@3&"%83*5&
    ]
    42-*5&@01&/@$3&"5&
    OJM
    
    
    TXJUDI
    TUBUVT
    \
    
    
    DBTF
    42-*5&@0,
    
    
    
    QSJOU TRMJUF
    PQFO
    
    
    
    MFU
    TUBUVT
    
    TRMJUF@DMPTF EC
    
    
    
    TXJUDI
    TUBUVT
    \
    
    
    
    DBTF
    42-*5&@0,
    
    
    
    
    QSJOU TRMJUF
    DMPTFE
    
    
    
    EFGBVMU
    
    
    
    
    QSJOU TRMJUF
    FSSPS= TUBUVT 
    
    
    
    ^
    
    
    EFGBVMU
    
    
    
    QSJOU TRMJUF
    FSSPS= TUBUVT 
    
    
    ^
    
    ^
    ^
    make sure it's public
25. Yes!! %
26. make sure
 Header file in Framework 48*'5@$-"44 @5U$UFTU@TRMJUF@JPT@GSBNFXPSL5FTU4RMJUF@J04
    !JOUFSGBDF
    5FTU4RMJUF@J04
    
    /40CKFDU
    
    WPJE UFTU
    
    OPOOVMM
    JOTUBODFUZQF JOJU
    0#+$@%&4*(/"5&%@*/*5*"-*;&3
    !FOE
27. Yes!! &
28. module.modulemap
29. Clang
30. module.modulemap NPEVMF
    TRMJUF
    <TZTUFN>
    \
    
    IFBEFS
    TRMJUFI
    
    FYQPSU
    
    ^
    
31. module-id NPEVMF
    TRMJUF
    <TZTUFN>
    \
    
    IFBEFS
    TRMJUFI
    
    FYQPSU
    
    ^
    
32. Attributes NPEVMF
    TRMJUF
    <TZTUFN>
    \
    
    IFBEFS
    TRMJUFI
    
    FYQPSU
    
    ^
    The system attribute specifies that the module is a system module. When a system module is rebuilt, all of the module’s headers will be considered system headers, which suppresses warnings. This is equivalent to placing #pragma GCC system_header in each of the module’s headers.
33. header NPEVMF
    TRMJUF
    <TZTUFN>
    \
    
    IFBEFS
    TRMJUFI
    
    FYQPSU
    
    ^
    
34. export NPEVMF
    TRMJUF
    <TZTUFN>
    \
    
    IFBEFS
    TRMJUFI
    
    FYQPSU
    
    ^
    Export declaration¶ An export-declaration specifies which imported modules will automatically be re-exported as part of a given module’s API.
 
 The export-declaration names a module or a set of modules that will be re-exported to any translation unit that imports the enclosing module. Each imported module that matches the wildcard-module-id up to, but not including, the first * will be re-exported.
35. module map issues
36. Can't open declaration cmd + click
37. github: UsingCinSwift
38. github: ZUnzip
39. github: SqliteKit
40. Yes!! &
41. C-callback
42. C style callback • CGPathApplierFunction() • CGPatternCallbacks() • CGPDFOperatorTableSetCallback()
43. Oh well…. CGPath's C style callback
44. may the force is with you Stay tuned…..
45. Wrap Up
46. Wrap Up • There are so many good libraries out there! • Use Bridging Header, if you like to use C library in your app • Use module, if you like to use C library in your framework
47. Thank you Kaz Yoshikawa
 kaz@digitallynx.com