Program Crash

[jonmatteo]

Hi all,
I have implemented a C++ function that uses a C library. I have no problem if i call it from main but when i call it whitin a QWidget the program crashes.
Any help?
Thanks

[spirit]

check line 45 in your source.
no, seriously provide more information and code.

[jonmatteo]

ok
the function i have to call il


void run()
{
MesDomain *domain;
domain=new MesDomain();
std::vector<MesPoint> p;
std::vector<MesEndPoints> s;
std::vector<MesPoint> v;
...
domain->setPolygon(p,s,h);
domain->computeQuadrangulation();
...
delete domain
}


here is class MesDomain



class MesDomain
{
private:
MesPolygon *polygon;
MesNodes *nodes;
MesEdges *edges;
MesElements *elements;
CQMesh *mesh;

public:
MesDomain();
~MesDomain();

void setPolygon(std::vector<MesPoint>, std::vector<MesEndPoints>, std::vector<MesPoint> );
void computeQuadrangulation();
void saveQuadrangulation(std::string);

private:
void computeTriangulation(triangulateio *);
};


and its methods:


void MesDomain::setPolygon(std::vector<MesPoint> v, std::vector<MesEndPoints> s, std::vector<MesPoint> h) {
for (std::vector<MesPoint>::iterator it=v.begin(); it!=v.end(); ++it) polygon->addVertex(*it);
for (std::vector<MesEndPoints>::iterator it=s.begin(); it!=s.end(); ++it) polygon->addSegment(*it);
for (std::vector<MesPoint>::iterator it=h.begin(); it!=h.end(); ++it) polygon->addHole(*it);
}




void MesDomain::computeQuadrangulation() {

triangulateio *triangulation;
triangulation = new triangulateio;
...
computeTriangulation(triangulation);
...
}





void MesDomain::computeTriangulation(triangulateio *out) {

triangulateio in;
...
char * opt = ...;
triangulate(opt, &in, out, 0);
}


and triangulateio and triangulate are defined in the C library

[spirit]

put a break point and check all variables. maybe some of pointers are equal to "0".


void MesDomain::computeTriangulation(triangulateio *out) {

triangulateio in;
...
char * opt = ...;//<--- put a break point here

[Lykurg]

I have no problem if i call it from main but when i call it whitin a QWidget the program crashes.

After you call "delete domain" in run() you maybe try to access any variable/function of that class? This would explain, why in main() you don't get an error, since there you don't delete it (of just leave the application afterward).

[jonmatteo]

thank you all
I cant get what was the problem but now i can run it
probably some empty pointer
Thanks