[Swig-user] SWIG & C# - Default typemap to handle "unsigned char *" as array going strange

[schullq]

Hello,

I started using SWIG to wrap a C++ library, in order to use it in C#.

I am playing arround with typemaps, in order to get rid of all the
SWIGTYPE_* class (which I understand are created because did'nt know how to
wrap a certain type.

Anyway, I am having trouble with a simple typemap. I have multiple methods
that return unsigned char * in C++, which need to be consider as unsigned
char arrays. I found in "array_csharp.i" that there are multiple ways to
handle this situation. I tried them all but I never get the correct result
like the example in the doc.

Here is my c++ method:

/inline unsigned char* getData() { return d_key; };/

Here are all the implementations I tried to set the correct typemap using
%apply:

1. /%apply unsigned char OUTPUT[] { unsigned char* getData() }/
2. /%apply unsigned char OUTPUT[] { unsigned char* }/
3. /%apply unsigned char FIXED[] { unsigned char* getData() }/
/%csmethodmodifiers getData "public unsafe";/

But nothing, I always got this result:

- For tries 1 and 2:
/ public virtual byte[] getData() {
global::System.IntPtr cPtr =
libdataPINVOKE.Key_getData__SWIG_0(swigCPtr);
SWIGTYPE_p_unsigned_char ret = (cPtr == global::System.IntPtr.Zero) ?
null : new SWIGTYPE_p_unsigned_char(cPtr, false);
return ret;
}/

- For try 3:
/ public unsafe byte[] getData() {
global::System.IntPtr cPtr =
libdataPINVOKE.Key_getData__SWIG_0(swigCPtr);
SWIGTYPE_p_unsigned_char ret = (cPtr == global::System.IntPtr.Zero) ?
null : new SWIGTYPE_p_unsigned_char(cPtr, false);
return ret;
}/

I can't understand why the mapping only works for the declaration return
value.

If someone have a hint, I would be very pleased.

schullq.







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