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Re: [Swig-user] how to wrap double ** in a struct ?
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From: fmotif <fm...@ya...> - 2006-11-06 22:30:36
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William
Thanks for the answer...
The pointers defined into the struct XYZ represent
arrays, the double pointer (double **) is a matrix 2D
and (char **) represents an array of strings.
To wrap the array of strings i´m using the STRING
pattern, but about the others, any one have an example
with a case looks like this, but using only C (without
C++).
I looked at arrays_java.i, but I need an easy
example ...
Fabio
>
> fmotif wrote:
> > Hi
> >
> > at the moment i?m not expert with swig scripting
> > language...
> >
> > I?m trying to generate wrappers for JAVA to this
> > srtuct
> >
> > typedef struct
> > {
> > short *reclas;
> > char **siglas;
> > double *X;
> > double *Y;
> > double **Z;
> > char **descrZs;
> > long numZs;
> > long numSiglas;
> > } XYZ;
> >
> > the problems are the double *, double ** and short
> *,
> > that generates: SWIG_p..., I tryied resolve the
> short
> > * with:
> >
> > %include typemaps.i
> > %apply short *INPUT {short *};
> > typedef struct { ...
> > }
> >
> > but the java code doesn?t compile
> >
> > thanks
> >
>
> You need to first say how you want to marshal these
> types for Java, eg
> is reclas a pointer to a single element or an array?
> The same for all
> the pointers in your XYZ class above. The approach
> to wrap this would be
> different for each. Look at arrays_java.i for
> arrays.
>
> William
>
>
>
> ------------------------------
>
> Message: 6
> Date: Fri, 3 Nov 2006 15:57:50 -0600
> From: robert engels <re...@ix...>
> Subject: Re: [Swig-user] unsigned char pointer as
> byte[] in Java ?
> To: William S Fulton <ws...@fu...>
> Cc: swi...@li...
> Message-ID:
> <E63...@ix...>
> Content-Type: text/plain; charset=US-ASCII;
> delsp=yes; format=flowed
>
> Thank you very much. I will test it out.
>
> I confess I don't know SWIG at all (the mapping
> documents related to
> java were not very clear - at least to me). I am
> attempting to help
> out with some other projects and they used it for
> JNI integration. I
> have started to work on a custom JNI implementation
> because I could
> not get this to work.
>
> Robert
>
> On Nov 3, 2006, at 3:54 PM, William S Fulton wrote:
>
> > robert engels wrote:
> >> Hello all,
> >>
> >> I have a C struct that I am trying to use from
> Java, accessing the
> >> unsigned char * as a byte[]. (It seems that
> arrays_java.i wants to
> >> access this as a short[] for some reason).
> >>
> > It is the most appropriate type that covers all
> possible values of an
> > unsigned char array.
> >
> >> struct mystruct {
> >> unsigned char *mydata;
> >> int mydatalen;
> >> };
> >>
> >> I looked at various.i and saw the 'accessing a
> char* as a byte[], but
> >> when I create the following for an unsigned char
> *
> >>
> >> %typemap(jni) (unsigned char *BYTE) "jbyteArray"
> >> %typemap(jtype) (unsigned char *BYTE) "byte[]"
> >> %typemap(jstype) (unsigned char *BYTE) "byte[]"
> >> %typemap(in) unsigned char *BYTE { $1 = (unsigned
> char *)
> >> JCALL2(GetByteArrayElements, jenv, $input, 0);
> >> }
> >> %typemap(argout) unsigned char *BYTE {
> >> JCALL3(ReleaseByteArrayElements, jenv,
> $input, (jbyte *) $1, 0);
> >> }
> >> %typemap(javain) (unsigned char *BYTE)
> "$javainput"
> >> /* Prevent default freearg typemap from being
> used */
> >> %typemap(freearg) (unsigned char *BYTE) ""
> >>
> >> and then try to apply it using:
> >>
> >> %apply unsigned char *BYTE { (unsigned char
> *mydata) };
> >>
> >> it generates the following code
> >>
> >> public void setMydata(byte[] value) {
> >> MySwigTestJNI.mystruct_mydata_set(swigCPtr,
> value);
> >> }
> >>
> >> public byte[] getMydata() {
> >> long cPtr =
> MySwigTestJNI.mystruct_mydata_get(swigCPtr);
> >> return (cPtr == 0) ? null : new
> SWIGTYPE_p_unsigned_char(cPtr,
> >> false);
> >> }
> >>
> >> which does not compile
> >>
> >> mystruct.java:41: incompatible types
> >> found : byte[]
> >> required: long
> >> long cPtr =
> MySwigTestJNI.mystruct_mydata_get(swigCPtr);
> >>
> ^
> >> mystruct.java:42: incompatible types
> >> found : net.sf.libusb.SWIGTYPE_p_unsigned_char
> >> required: byte[]
> >> return (cPtr == 0) ? null : new
> SWIGTYPE_p_unsigned_char(cPtr,
> >> false);
> >> ^
> >> I have attached a complete testcase with
> makefile. I am sure it is
> >> something simple, but I can't seem to find it.
> >>
> > You are missing the javaout typemap. You probably
> need:
> >
> > %typemap(javaout) (unsigned char *BYTE) {
> > return $jnicall;
> > }
> >
> > Also your freearg typemap has a typo for the type,
> it should be
> > "unsigned char" not "unsignedchar".
> >
> > William
>
>
>
>
> ------------------------------
>
> Message: 7
> Date: Fri, 03 Nov 2006 22:11:14 +0000
> From: William S Fulton <ws...@fu...>
> Subject: Re: [Swig-user] Generated code for
> std::string director seems
> wrong for java...
> To: Mark Donszelmann
> <Mar...@sl...>
> Cc: swi...@li...
> Message-ID: <454...@fu...>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Mark Donszelmann wrote:
> > Hi
> >
> > the typemap in Lib/java/std_string.i
> >
> >
>
%typemap(directorout,warning=SWIGWARN_TYPEMAP_THREAD_UNSAFE_MSG)
> const
> > string &
> > %{ if(!$input) {
> > SWIG_JavaThrowException(jenv,
> SWIG_JavaNullPointerException, "null
> > std::string$
> > return $null;
> > }
> > const char *$1_pstr = (const char
> *)jenv->GetStringUTFChars($input, 0);
> > if (!$1_pstr) return $null;
> > /* possible thread/reentrant code problem */
> > static std::string $1_str($1_pstr);
> > $result = &$1_str;
> > jenv->ReleaseStringUTFChars($input, $1_pstr);
> %}
> >
> >
> > generates code like:
> >
> > static std::string
> c_result_str(c_result_pstr);
> >
> > which works the first time this method is called.
> The second time the
> > initialization of
> > c_result_str seems to not be done (g++ 4.0.1 MacOS
> X 10.4.8) so the
> > result of
> > the first call is returned.
> >
> > I fixed this by doing:
> >
> > static std::string c_result_str;
> > c_result_str = c_result_pstr;
> >
> > which does return the correct value.
> >
> > Is this a bug in SWIG (or in g++ 4.0.1 ?) or in my
> thinking of c++?
> >
>
> Definitely a SWIG bug. Your fix is the right one and
> is now committed to
> cvs.
>
> William
>
>
>
> ------------------------------
>
> Message: 8
> Date: Fri, 3 Nov 2006 14:10:45 -0800
> From: "Sohail Somani" <s.s...@fi...>
> Subject: Re: [Swig-user] Generated code for
> std::string director seems
> wrong for java...
> To: "William S Fulton" <ws...@fu...>,
> "Mark Donszelmann"
> <Mar...@sl...>
> Cc: swi...@li...
> Message-ID:
>
>
<1C1...@xb...>
> Content-Type: text/plain; charset="us-ascii"
>
> > -----Original Message-----
> > From: swi...@li...
> > [mailto:swi...@li...]
> On Behalf Of
> > William S Fulton
> > > I fixed this by doing:
> > >
> > > static std::string c_result_str;
> > > c_result_str = c_result_pstr;
> > >
> > > which does return the correct value.
> > >
> > > Is this a bug in SWIG (or in g++ 4.0.1 ?) or in
> my thinking of c++?
> > >
> >
> > Definitely a SWIG bug. Your fix is the right one
> and is now
> > committed to
> > cvs.
>
> Why does it need a static? To prevent copies? Well,
> it does a copy there
> anyway... Might as well return c_result_pstr.
>
>
>
> ------------------------------
>
> Message: 9
> Date: Fri, 03 Nov 2006 17:17:50 -0500
> From: Dave Ludwig <dl...@si...>
> Subject: [Swig-user] Hopefully an easy one -
> SWIGTYPE_p_string
> To: Swig User List <swi...@li...>
> Message-ID: <454...@si...>
> Content-Type: text/plain; charset=ISO-8859-1;
> format=flowed
>
> Using stl::string type in my C++ project.
> I have std_string.i included in my input file and
> also a "using
> namespace std" command.
>
> One of my C++ member functions is defined in C++ as:
> void SetMpeConfigFile (const string& val)
>
> In Java when I try to use
> mpe.SetMpeConfigFile("Hello.cfg");
>
> I get an error message
> The method SetMpeConfigFile(SWIGTYPE_p_string) in
> the type MpeApp is not
> applicable for the
> arguments (String)
>
> Thanks.
>
> --
> Dave Ludwig
> SISCO, Inc.
>
>
>
>
> ------------------------------
>
> Message: 10
> Date: Fri, 3 Nov 2006 22:33:40 +0000 (UTC)
> From: stef_ <st....@vi...>
> Subject: Re: [Swig-user] R: Re: Wrapping
> To: swi...@li...
> Message-ID: <loo...@po...>
> Content-Type: text/plain; charset=us-ascii
>
> st.marengo <at> virgilio.it <st.marengo <at>
> virgilio.it> writes:
>
> After a lot of attempts, I have compiled something
> working for "int *".
> There is only the problem of a memory leak. :(
>
> The next step for me is doing to same with a
> "virtual int *getValue();"
> converted to java byte[].
>
> Bye
>
> class
> Alpha {
> public:
> virtual int *getValue();
> };
>
> %include "typemaps.i"
> %include "arrays_java.i"
>
> // this affects moduleJNI.java in doing upcall()
> %typemap(javadirectorout) int * "$javacall"
>
> // this affects directorxxx.java virtual method body
> %typemap(javaout) int * { return $jnicall; }
>
> // this affects module_wrap.cxx for jresult of
> CallStaticObjectMethod()
> %typemap(jni) int * "jintArray"
>
> // this affects moduleJNI.java in return type of
> method doing upcall()
> %typemap(jtype) int * "int[]"
>
> // this affects directorxxx.java return type of
> virtual method
> %typemap(jstype) int * "int[]"
>
> // this affects module_wrap.cxx in managing result
> of CallStaticObjectMethod()
> %typemap(directorout) int * { result =
> jenv->GetIntArrayElements(jresult, 0); }
>
> // this affects module_wrap.cxx for signature in
> swig_connect_director()
> %typemap(directorin, descriptor="[I") int * ""
>
>
>
>
> ------------------------------
>
>
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>
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