如何重新分配 wxImage 指针

Question

I'm trying to create a kind of image editor in wxWidgets and I load and store the image in a wxImage pointer. As the user click a button it suppose to delete the pointer and assign them again to a new wxImage. The code I use look like this.

class MyFrame : public wxFrame {
  wxImage *old_image;
  void OnLoad(wxCommandEvent &event);
};

void MyFrame::OnLoad(wxCommandEvent &event) {
  // Get the image path with wxFileDialog and read it.

  wxImage *new_image = new wxImage(new_width,
                                   new_height,
                                   image_data);

  // old_image->Destroy(); // I think this also work
  delete old_image;
  old_image = new_image;
}

I know the code works the first time I load a new image, but by the second time it hangs and crash the application. So I think the error is not in the load algorithm.

How I suppose to delete the wxImage? Or there is a more reliable way to change the image?

I'm using wxWidgets 3.0.5, MinGW-w64 with gcc 8.0.1

Answer 1

With that constructor, wxImage will take ownership of image_data and will free it when deleted. In order to reuse it, you must pass true to the 4th argument ( static_data , see the docs).