[Vxl-users] vgui: basic_manager load_image function causing problems with saving to file

[maziyar <ma...@ua...>]

Hi,

I am using the basic_manager tutorial provided for vxl gui (vgui), except I 
have modified it by adding an extra menu item to save data to an external 
file.  The code is below.  Basically, when I call my_save(), it first loads an 
image (using load_image(), the unmodified code provided by the basic_manager 
tutorial), then it calls my function "save_data()" which should then save a 
vector to a file.  The problem is this: if I don't call load_image(), or if I 
cancel load_image at the browse dialog box, the save_data WORKS and creates an 
external file, "my_object.bvl", to save the data in.  However, if load_imag is 
called, and an image is selected, then the save data no longer creates the 
"my_object.bvl" file and thus does not save the data to the external file.  
All the other code is exactly the same as the basic_manager tutorial provided 
in the VXL installation.  My only modification is the addition of the 
my_save() menu item and the save_data() member function.

Any assistance would be greatly appreciated.  Thanks

void basic_manager::my_save()
{
	load_image();
	save_data();

}

bool basic_manager::save_data()
{
	if (!messagebox("Would you like to save the training set?")){
		return false;
	}
	//else, save data
	vsl_b_ofstream bfs("my_object.bvl");
	if (!bfs){
		vcl_cerr<<"Failed to open my_object.bvl for output."<<vcl_endl;
	}
	else{
		vcl_vector<float> test(4);
		test[0] = 1.0;
		test[1] = 1.0;
		test[2] = 1.0;
		test[3] = 1.0;
        vsl_b_write(bfs,test);
		bfs.close();
	}
	return true;
}

//Function to load an image then redraw so image appears
void basic_manager::load_image()
{
	vgui_dialog load_image_dlg("Load image file");
	static vcl_string image_filename = "";
	static vcl_string ext = "*.*";
	load_image_dlg.file("Image Filename:", ext, image_filename);

	if (!load_image_dlg.ask())
		return;

	img_ = vil1_load(image_filename.c_str());
	itab_->set_image(img_);

}