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Passing a TopoDS_Shape as an Argument in a QT Signal and Slot

AP's picture
Forums: 

Hello There,

is there anyway of passing a TopoDS_Shape as a signal and slot argument.
I have been trying to no success.

when i call emit finishshape( myshape) the connected SLOTS are not called, i switch the signature of my SIGNAL AND SLOT to work with an int and it works, so it seems like the SIGNAL and SLOT mechanism in QT works only with standard types and QObject types, or i could be mistaken.

is this connected to the fact the TopoDS_Shape doesnt have a == operator and or its const & definition? ---> dont quote me on any of this, im not a computer scientist, so i dont understand most of these concepts.

my last resort will be to make a simple QObject wrapper that contains a TopoDS_Shape and use it as a message object.
I am trying to avoid this option, hopefully the solution could be solve with a typedef.

Best,

AlexP

**************************************

this is my class:

#pragma once

#include
#include

class booleanthread : public QThread
{
Q_OBJECT
public:
booleanthread(QObject *parent = 0,TopoDS_Shape& sh1 = TopoDS_Shape(),TopoDS_Shape& sh2 = TopoDS_Shape())
: QThread(parent),theshape1(sh1),theshape2(sh2)
{
int nullcount = 0;
if(sh1.IsNull()) nullcount++;
if(sh2.IsNull()) nullcount++;

theshape1 = sh1;
theshape2 = sh2;

if(theshape1.IsNull()) nullcount++;
if(theshape2.IsNull()) nullcount++;

inputs

};
~booleanthread(void);

signals:
void finishedshape(TopoDS_Shape newval);

protected:
void run();

private:

TopoDS_Shape& theshape1;
TopoDS_Shape& theshape2;
QList inputs;

};

#include "booleanthread.h"
#include
#include

booleanthread::~booleanthread(void)
{
}

void booleanthread::run()
{
//BRepAlgoAPI_BooleanOperation* myop = new BRepAlgoAPI_BooleanOperation(obj1, obj2, BOP_COMMON);
//myop->Build();
//TopoDS_Shape result = myop->Shape();
//int counter = 0;
// if(theshape1.IsNull()) return;
// if(theshape2.IsNull()) return;

//BRepAlgoAPI_Common* bcom = new BRepAlgoAPI_Common(theshape1,theshape2);
TopoDS_Shape intcrv = hsf::move(theshape1,gp_Vec(0,0,10));

emit finishedshape(intcrv);

/*try{ const TopoDS_Shape & result = bcom->Shape();
emit finishedshape(result);
} catch(...) {
int errorstat = bcom->ErrorStatus();
qDebug() }
*/

//while(!bcom->IsDone())
// {
//
//
// }

/*const TopoDS_Shape & result = bcom->Shape();*/

//int nbp;
//TopoDS_Shape result = hsf::AddNewIntersectionPointMulti(obj1,obj2);

};

**************************************************

// i am calling from this other code on the main function.

booleanthread* bt = new booleanthread(this,shapelist[0],EOS);
threadlist

connect(threadlist.last(),SIGNAL(finishedshape( TopoDS_Shape )),this,SLOT(appendtolist( TopoDS_Shape )));
threadlist.last()->start();

Thorsten's picture

Hi,

perhaps the type has to be marshaled. Have a look at:
http://doc.qt.nokia.com/latest/qmetatype.html#details

I had to
Q_DECLARE_METATYPE(TopoDS_Shape);
to use TopoDS_Shape with QVariant

Regards
SK

Roman Lygin's picture

Alex,
Use const TopoDS_Shape& and not TopoDS_Shape. This will avoid unnecessary copying. No Qt declaration is required.
HTH.
Roman

AP's picture

Thank you very much Roman. will test this immediately.

Best

AlexP

AP's picture

Thanks spam killer!

P Dolbey's picture

Maybe its just me, but wouldn't it make sense to access the TopoDS_Shape by handle, then you could use something like a simple pointer to a Handle_TopoDS_Shape to pass the object pointer in the signal, which you could de-ref in the slot. I've successfully tried this in the past.

Pete

AP's picture

Dear Peter,

Thanks for the tip, didn't know you could make a handle of the TopoDS_Shape, nice to know.

Best,

AlexP

P Dolbey's picture

Apologies - its the TopoDS_TShape that can be accessed by handle.
Pete

P Dolbey's picture

... Although there is a handle wrapper class as well TopoDS_HShape.

Francois Lauzon's picture

Hello Alex,
to use a new type in signal/slot BETWEEN THREAD (it's not needed if it's not between thread), you need to register the argument with Qt first, like this:
qRegisterMetaType("TopoDS_Shape");

Good Luck,
Francois.

AP's picture

Dear Francois,

Thank You very much, will try this one out right now, im new to threading! thanks for the tip.

Best,

AlexP

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