Debug assertion failed ! problem

[Muhammed Salman]

Hi,
I am having this problem when i try to execute the .exe of my application
"Debug assertion failed !, Expression invalid null pointer"

After a bit of googling i think so i know where the problem lies, but have no idea how to solve it.

Below is the relevant piece of code.

size_t idx;
// create the initial texture
atlases.push_back(new TextureAtlas( image_names.size()));
// load the texture
for (idx = 0; idx < image_names.size(); ++idx) {

//load the image
TextureInformation *ti = new TextureInformation (idx, folder_location_str, image_names[idx]);


During the execution of the code at the line where ti is initialized and declared the values at local tab(in ms visual c++ 2008) are something like below.


ti TextureInformation *
idx CXX0030: Error: expression cannot be evaluated
image_path {npos=4294967295 _Bx={...} _Mysize=??? ...} std::basic_string<char,std::char_traits<char>,std::allocator<char> >
image_name {npos=4294967295 _Bx={...} _Mysize=??? ...} std::basic_string<char,std::char_traits<char>,std::allocator<char> >
image CXX0017: Error: symbol "" not found


For some reason: idx and image shows error here and this only happens during the first iteration of the for loop. Below is the content of ti during the second iteration

idx 0 unsigned int
+ image_path ".....Related\PNG\" std::basic_string<char,std::char_traits<char>,std::allocator<char> >
+ image_name "basn0g01.png" std::basic_string<char,std::char_traits<char>,std::allocator<char> >
+ image 0x00812830 {m_info={...} m_pixbuf={...} } png::image<png::basic_rgba_pixel<unsigned char> > *


This is how my TextualInformation looks


class TextureInformation
{
public:
TextureInformation(size_t index, std::string path, std::string name)
: idx(index), image_path(path), image_name(name)
{
image = new png::image<png::rgba_pixel>(image_path + image_name,
png::convert_color_space<png::rgba_pixel>());
}
~TextureInformation(void)
{
delete image;
}
....
....
private:
size_t idx;
std::string image_path;
std::string image_name;
png::image<png::rgba_pixel>* image;
};

Please tell me if other details are required. Thanks