[Swig-devel] [ swig-Bugs-2753487 ] [C#] bool & OUTPUT typemap does not work

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Bugs item #2753487, was opened at 2009-04-11 17:54
Message generated for change (Comment added) made by wsfulton
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>Category: csharp
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: Milo Yip (miloyip)
>Assigned to: William Fulton (wsfulton)
Summary: [C#] bool & OUTPUT typemap does not work

Initial Comment:
As shown in the following example, *jarg4 has not been initialized to zero, so writing to *arg4 can only write the first byte of *jarg4. If the other three bytes are non-zero initially, then after calling the wrapper in C# the bool parameter must be true, no matter what C++ side outputs.

This is non-deterministic because *jarg4 is passed by interop and it is
non-initailized.

// in Runtime.i
%include <typemaps.i>
class Runtime {
bool GetField(int object, const char* fieldName, bool& OUTPUT);
};

// Runtime.cxx

SWIGEXPORT unsigned int SWIGSTDCALL CSharp_Runtime_GetField__SWIG_1(void *
jarg1, int jarg2, char * jarg3, unsigned int * jarg4) {
unsigned int jresult ;
Mil::Script::Runtime *arg1 = (Mil::Script::Runtime *) 0 ;
Mil::Script::Object arg2 ;
char *arg3 = (char *) 0 ;
bool *arg4 = 0 ;
bool result;

arg1 = (Mil::Script::Runtime *)jarg1; 
arg2 = (Mil::Script::Object)jarg2; 
arg3 = (char *)jarg3; 
arg4 = (bool *)jarg4; 
result = (bool)(arg1)->GetField(arg2,(char const *)arg3,*arg4);
jresult = result; 
return jresult;
}

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>Comment By: William Fulton (wsfulton)
Date: 2009-04-21 20:14

Message:
I can't replicate the bug, but agree there is a problem. Fixed for
swig-1.3.40. Please wait for the new release or add in this typemap:

%typemap(in) bool *OUTPUT, bool &OUTPUT
%{ *$input = 0; 
   $1 = ($1_ltype)$input; %}



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