I want to clip lines but I get runtime error

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hi I use clip library with C++, but I get run time error when execute below instruction.
c.AddPaths(subj, ptSubject, false); if I use true instead of false, I don't get run time error, but I don't want to clip polygon. I want to clip lines.
look below code.

C++

Paths subj(2), clip(1), solution;
subj[0] <<IntPoint(180, 200) << IntPoint(260, 200);
subj[1] <<IntPoint(215, 160) << IntPoint(230, 190);
clip[0] <<IntPoint(190, 210) << IntPoint(240, 210) <<IntPoint(240, 130) << IntPoint(190, 130);
Clipper c;
c.AddPaths(subj, ptSubject, false);// run time error here
c.AddPaths(clip, ptClip, true);
c.Execute(ctIntersection, solution, pftNonZero, pftNonZero);

I get below run time error.

Unhandled exception at 0x77004598 in sample.exe: Microsoft C++ exception: ClipperLib::clipperException at memory location 0x009BF054.

Posted 19-Sep-15 12:08pm

kave2011

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barneyman 19-Sep-15 19:46pm

have you tried catching the exception and using the what() method?

kave2011 19-Sep-15 20:03pm

error is at line of 1060 from clipper.cpp inside AddPath method, at below instruction
int highI = (int)pg.size() -1;
sample.exe!ClipperLib::ClipperBase::AddPath(const std::vector<clipperlib::intpoint,std::allocator<clipperlib::intpoint> > & pg, ClipperLib::PolyType PolyTyp, bool Closed) Line 1060 C++

barneyman 20-Sep-15 0:45am

http://sourceforge.net/p/polyclipping/code/HEAD/tree/trunk/cpp/clipper.cpp#l1061

it's not excepting on that line, but throwing just before it ...

learn how to catch and handle exceptions

http://www.tutorialspoint.com/cplusplus/cpp_exceptions_handling.htm

Richard MacCutchan 20-Sep-15 7:49am

What is the value of variable c and what is the value of the parameters on the line that causes the error?

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