Using external libraries.

[TurkeyLurkerParticipant]

I have a library that I have tested and successfully used in C. The library has a function:

void swe_set_ephe_path(char *path)

I am importing the library where this function is stored into monkey2, but I am not sure about the extern declaration. I also am not sure on how to properly use the function in Monkey2. What could I be doing wrong?

Monkey

[crayon-5cba89fa79a6d418484895 inline="true" ]#Import "<mojo>" #Import "<std>" Using mojo.. Using std.. #Import "../../sweph/lib/libswe.a" #Import "../../sweph/src/swephexp.h" Extern Function _swe_set_ephe_path:Void(path:Byte Ptr) 'This line compiles fine. Public Function Main() Print "This is the beginning of EphTest.monkey2..." _swe_set_ephe_path("../../ephemeris") 'When I try to use the function, I get this error. How would I convert? End Function

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[crayon-5cba89fa79a6d418484895 inline="true" ]#Import "<mojo>" #Import "<std>"   Using mojo.. Using std..   #Import "../../sweph/lib/libswe.a" #Import "../../sweph/src/swephexp.h"   Extern Function _swe_set_ephe_path:Void(path:Byte Ptr)  'This line compiles fine. Public   Function Main() Print "This is the beginning of EphTest.monkey2..." _swe_set_ephe_path("../../ephemeris") 'When I try to use the function, I get this error.  How would I convert? End Function

[/crayon]

[CopperCircleParticipant]

Hi, take a look at other modules that use c libs:

http://monkeycoder.co.nz/forums/topic/tinyaes-wrapper/

[DruggedBunnyParticipant]

Can’t see anything obviously wrong, but also of course can’t test it. Might be worth trying to change path:Byte Ptr to path:CString, though I suspect they work out the same…

This was my earlier effort at importing an external function, though slightly different circumstances… yours looks pretty much the same setup, though:

http://monkeycoder.co.nz/forums/topic/simple-win32-api-call-attempt/

What was the error message?

[abakoboParticipant]

Mx2 strings are not Cstrings. Checkout the toCString method.

[Mark SiblyKeymaster]

Use the built-in CString type for extern char* type strings, eg:

Monkey

#Import “../../sweph/lib/libswe.a” #Import “../../sweph/src/swephexp.h” extern function swe_set_ephe_path( path:CString ) public function Main() swe_set_ephe_path( "blah" ) end

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#Import “../../sweph/lib/libswe.a” #Import “../../sweph/src/swephexp.h”   extern   function swe_set_ephe_path( path:CString )   public   function Main()     swe_set_ephe_path( "blah" ) end

[TurkeyLurkerParticipant]

Thank you all! I set the name of the function to the C++ equivalent (no underscore at the beginning), and changed the Byte Ptr to CString in the extern, and now it all works.

Monkey

[crayon-5cba89fa856a9284684059 inline="true" ]#Import "<mojo>" #Import "<std>" Using mojo.. Using std.. #Import "../../sweph/lib/libswe.a" #Import "../../sweph/src/swephexp.h" Extern Function swe_set_ephe_path:Void(path:CString) Public Function Main() Print "This is the beginning of EphTest.monkey2..." Local pth:String = "../../ephemeris" swe_set_ephe_path(pth) End Function

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[crayon-5cba89fa856a9284684059 inline="true" ]#Import "<mojo>" #Import "<std>"   Using mojo.. Using std..   #Import "../../sweph/lib/libswe.a" #Import "../../sweph/src/swephexp.h"   Extern Function swe_set_ephe_path:Void(path:CString) Public   Function Main() Print "This is the beginning of EphTest.monkey2..." Local pth:String = "../../ephemeris" swe_set_ephe_path(pth) End Function

[/crayon]

[abakoboParticipant]

Wow though I had to convert it myself!

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