to do the appropriate typemapping until just a few minutes ago. I've
just committed to svn some typemaps that Antti Karanta sent in. These
provide numerous ways to marshal arrays for C#. Take a look, you can see
> I don't remember whether SWIG has an "official" way to pass arrays. Here
> is what I use:
>
> // Array marshaling for arrays of primitives
> %define %cs_marshal_array(TYPE, CSTYPE)
> %typemap(ctype) TYPE[] "void*"
> %typemap(imtype,
> inattributes="[MarshalAs(UnmanagedType.LPArray)]") TYPE[] "CSTYPE[]"
> %typemap(cstype) TYPE[] "CSTYPE[]"
> %typemap(in) TYPE[] %{ $1 = (TYPE*)$input; %}
> %typemap(csin) TYPE[] "$csinput"
> %enddef
>
> // The following macro invocations allow you to pass arrays of primitive
>
> // types. Arrays of other things such as System.Drawing.Point are also
> // possible.
> %cs_marshal_array(bool, bool)
> %cs_marshal_array(short, short)
> %cs_marshal_array(unsigned short, ushort)
> %cs_marshal_array(int, int)
> %cs_marshal_array(unsigned int, uint)
> %cs_marshal_array(long, int)
> %cs_marshal_array(unsigned long, uint)
> %cs_marshal_array(long long, long)
> %cs_marshal_array(unsigned long long, ulong)
> %cs_marshal_array(float, float)
> %cs_marshal_array(double, double)
>
> but for this to work, the function declaration needs to declare the
> parameter as TYPE[], not TYPE*. IIRC, if you then use
>
> %apply float[] { float* R_Values }
>
> ...the array typemap will be applied to your "float* R_Values" argument.
>
> I don't know whether it's possible to marshal float[,,]. You should try
> passing float[] first, and if you get that working, then try customizing
> the imtype and cstype typemaps to use float[,,] and see if it works.
>
> P.S. remember, typemaps (etc) must come before the function
> declarations.
>
>> mGetScalarI(int SchemeIndex,int index,long FromX,long ToX,long
> FromY,long
>> ToY,long FromZ,
>> long ToZ,float* R_Values);
>> -----Original Message-----
>> From: Ryan Koehnen [mailto:
ryan.koehnen@...]
>> Sent: Thursday, September 18, 2008 10:32 AM
>> To: David Piepgrass
>> Cc:
swig-user@...
>> Subject: Re: [Swig-user] Need help with C# generated code
>>
>> Ok, got it, thanks ;-)
>>
>> The next thing I'm stuck on is defining an array properly when the
> return
>> C type is float*.
>>
>> Example:
>>
>> mGetScalarI(int SchemeIndex,int index,long FromX,long ToX,long
> FromY,long
>> ToY,long FromZ,
>> long ToZ,float* R_Values);
>>
>> Where return type float* R_Values (in C#) should be float[,,] a 3
>> dimensional array (not an array of arrays).
>>
>> I know I should probably use typemaps somehow, but the examples all
> show
>> for perl,tcl and python so I'm not following them well.
>>
>> A simple example would be awesome.
>>
>> Thanks again,
>>
>> Ryan
>>
>>
>>
>> On Thu, Sep 18, 2008 at 10:15 AM, David Piepgrass
>> <
dpiepgrass@...> wrote:
>>
>>
>> SWIGTYPE_p_* represents an opaque handle. It is generated when
> SWIG
>> doesn't know how to represent a type in the target language. In this
> case
>> SWIG doesn't have typemaps for int*, so it uses SWIGTYPE_p_int.
>>
>>
>>
>> The first step to dealing with this problem is to think about
> what
>> the int* argument means. Is it an array? In that case you'll need a
>> typemap for mapping a C# array to a C++ array. Is it a reference or
> output
>> parameter? In that case you'll need a typemap for mapping a C# "ref
> int"
>> or "out int" to a C++ int*. You can see that SWIG can't deal with int*
>> automatically, because it is ambiguous.
>>
>>
>>
>> You can use SWIGTYPE_p_int directly if some other function
> returns
>> an int*. It will come out as SWIGTYPE_p_int in C#. In that case you
> can
>> pass the SWIGTYPE_p_int object to your "mCreateDataFile" function.
>>
>>
>>
>>
>> ________________________________
>>
>>
>> From:
swig-user-bounces@... [mailto:swig-user-
>>
bounces@...] On Behalf Of Ryan Koehnen
>> Sent: Thursday, September 18, 2008 8:34 AM
>> To:
swig-user@...
>> Subject: Re: [Swig-user] Need help with C# generated code
>>
>>
>>
>> Can anybody point me in the right direction on the proper use of
> the
>> generated SWIGTYPE_p classes? Could really use a clue at the moment.
>>
>> Thanks,
>>
>> Ryan
>>
>> On Wed, Sep 17, 2008 at 5:17 PM, Ryan Koehnen
>> <
ryan.koehnen@...> wrote:
>>
>> Hello list members,
>>
>> I have some questions on how to use swig C# generated code.
>> Specifically I have questions about the generated SWIGTYPE_p classes
> and
>> how to use them. If the answer is obvious, I apologize for my naivety
> on
>> this subject. Here's the example:
>>
>>
>> Source C Header snippet used as reference in .i file:
>>
>> DECLSPECIFIER int mCreateDataFile(char* FileName,char*
>> OrgName,int ClobberFlag,int* DFID);
>>
>>
>> Generated C wrapper function:
>>
>> SWIGEXPORT int SWIGSTDCALL CSharp_mCreateDataSet(char * jarg1,
> char
>> * jarg2, int jarg3, void * jarg4) {
>> int jresult ;
>> char *arg1 = (char *) 0 ;
>> char *arg2 = (char *) 0 ;
>> int arg3 ;
>> int *arg4 = (int *) 0 ;
>> int result;
>>
>> arg1 = (char *)jarg1;
>> arg2 = (char *)jarg2;
>> arg3 = (int)jarg3;
>> arg4 = (int *)jarg4;
>> result = (int)mCreateDataSet(arg1,arg2,arg3,arg4);
>> jresult = result;
>> return jresult;
>> }
>>
>>
>> Generated pinvoke call:
>>
>> [DllImport("meraf_swig_wrapper",
>> EntryPoint="CSharp_mCreateDataFile")]
>> public static extern int mCreateDataFile(string jarg1, string
>> jarg2, int jarg3, HandleRef jarg4);
>>
>>
>> Generated final C# call meant for consumption:
>>
>> public static int mCreateDataSet(string DSName, string
>> Organization, int ClobberFlag, SWIGTYPE_p_int DSIndex) {
>> int ret = Meraf_Swig_WrapperPINVOKE.mCreateDataSet(DSName,
>> Organization, ClobberFlag, SWIGTYPE_p_int.getCPtr(DSIndex));
>> return ret;
>> }
>>
>> I am having trouble using the generated custom type
> SWIGTYPE_p_int
>> class:
>>
>> public class SWIGTYPE_p_int {
>> private HandleRef swigCPtr;
>>
>> internal SWIGTYPE_p_int(IntPtr cPtr, bool futureUse) {
>> swigCPtr = new HandleRef(this, cPtr);
>> }
>>
>> protected SWIGTYPE_p_int() {
>> swigCPtr = new HandleRef(null, IntPtr.Zero);
>> }
>>
>> internal static HandleRef getCPtr(SWIGTYPE_p_int obj) {
>> return (obj == null) ? new HandleRef(null, IntPtr.Zero) :
>> obj.swigCPtr;
>> }
>> }
>>
>>
>> Here's a sample implmentation:
>>
>> static void Main(string[] args)
>> {
>> SWIGTYPE_p_int p; //what am I supposed to do with
> this
>> here? set it to null? new doesn't work.
>>
>> Meraf_Swig_Wrapper.mCreateDataFile(@"c:\temp\test12.mrf", "ryan", 1,
> p);
>> }
>>
>> How do I properly initialize this type? I get a runtime error of
>> unhandled exception of type 'System.TypeInitializationException' when
> I
>> instantiate SWIGTYPE_p_int and set it to null or set it to new
>> SWIGTYPE_p_int().
>>
>> Also if I need to set it to new somehow then why are all of the
>> constructors and method set to internal or protected? I don't wish to
>> make this part of the same assembly as my final code. Am I supposed
> to
>> inherit to use the protected constructor and then use it somehow?
>>
>>
>> Thanks for any help.
>>
>> Ryan
>>
>>
>>
>
>
>
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