Increasing Size of Vector

[Cyclone]

HI, I need to increase the size of my vector. However the program crashes.
How do I increase the size and prevent it from crashing. Below is the vector in question.

Thanks.

    const size_t width = 256, height = 256;
    size_t no_elems = width * height * 4;
    using Image = std::vector<unsigned char>;
    std::vector<Image> Image_PNG(6000, Image(no_elems));

[Peter87]

You can resize a vector using the resize member function.

vec.resize(new_size);

or

vec.resize(new_size, value_of_new_elements);

[Cyclone]

When I do that I get an "Unhandled Exception: System.AccessViolationExeption: Attempted to read or write protected memory. This is often an indication that other memory is corrupt"

[Peter87]

We don't have enough information to tell what is wrong. It might be that you're accessing an array element out of bounds (e.g. Image_PNG[6005].resize(85000);) but it could also be something completely unrelated. UB/memory corruption does not necessary crash right away but can sometimes cause bugs in other parts of the program. Using a memory debugger such as valgrind (not available on Windows) or an UB/address sanitizer (supported by all major compilers, e.g. with GCC you can enable it using the compiler flag -fsanitize=address,undefined) can often help you find these kind of problems (the cause, which is not necessarily close to where the crash happens). Otherwise if you cannot figure it out yourself I recommend creating a minimal example that demonstrates the problem and post it here so that we can have a look. https://en.wikipedia.org/wiki/Minimal_reproducible_example