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
}

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
}

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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 *);
};

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 *);
};

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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::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);
}

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void MesDomain::computeQuadrangulation() {
 
    triangulateio *triangulation;
    triangulation = new triangulateio;
    ...
    computeTriangulation(triangulation);
    ... 
}

void MesDomain::computeQuadrangulation() {

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

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void MesDomain::computeTriangulation(triangulateio *out) {
 
    triangulateio in;
    ...
    char * opt = ...;
    triangulate(opt, &in, out, 0);
}

void MesDomain::computeTriangulation(triangulateio *out) {

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

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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

void MesDomain::computeTriangulation(triangulateio *out) {
 
    triangulateio in;
    ...
    char * opt = ...;//<--- put a break point here

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[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