Cloning wxEvtHandler from a costum class Topic is solved

[the_drow]

I have a problem with copying a wxEvtHandler instance.

I have this class:

Code: Select all

class A : public wxEvtHandler
{
  B obj;
public:
  A() {
        obj.handler = this;
      }
//...
};

class B
{
   B()
   {
      //raises event
   }
};

This code crashes for some reason.
Any ideas?

[frank_frl]

Hi the_drow,

you are using a member 'handler' of class B in the ctor of class A, but this member is not declared in class B.

Code: Select all

class A : public wxEvtHandler
{
  B obj;
public:
  A() {
        obj.handler = this;
      }
//...
};

class B
{
   B()
   {
      //raises event
   }
};

Regards

Frank

[the_drow]

Hi the_drow,

you are using a member 'handler' of class B in the ctor of class A, but this member is not declared in class B.

Code: Select all

class A : public wxEvtHandler
{
  B obj;
public:
  A() {
        obj.handler = this;
      }
//...
};

class B
{
   B()
   {
      //raises event
   }
};

Regards

Frank

oh you're being petty lol. I did declare it in my code.
The program crashes on runtime.

[stef]

I have a problem with copying a wxEvtHandler instance.

I have this class:

Code: Select all

class A : public wxEvtHandler
{
  B obj;
public:
  A() {
        obj.handler = this;
      }
//...
};

class B
{
   B()
   {
      //raises event
   }
};

This code crashes for some reason.
Any ideas?

The problem is that the construction of object "obj" inside class A happens before the handler is assigned.

There are a couple of possibilities:
- don't raise the event in the B constructor (but sometimes later)
- set B's handler to a default handler initially
- allocate the B object on the heap with the handler as an argument.

and probably more

[the_drow]

I have a problem with copying a wxEvtHandler instance.

I have this class:

Code: Select all

class A : public wxEvtHandler
{
  B obj;
public:
  A() {
        obj.handler = this;
      }
//...
};

class B
{
   B()
   {
      //raises event
   }
};

This code crashes for some reason.
Any ideas?

The problem is that the construction of object "obj" inside class A happens before the handler is assigned.

There are a couple of possibilities:
- don't raise the event in the B constructor (but sometimes later)
- set B's handler to a default handler initially
- allocate the B object on the heap with the handler as an argument.

and probably more

I moved it from the constructor and now it just doesn't raise the event.

EDIT:
I used AddPendingEvent instead of ProcessEvent and that caused the problem.