DirectX11 CreateWICTextureFromMemory Using PNG - directx

Question

I've currently got textures loading using CreateWICTextureFromFile however I'd like a little more control over it, and I'd like to store images in their byte form in a resource loader. Below is just two sets of test code that return two separate results and I'm looking for any insight into a possible solution.
ID3D11ShaderResourceView* srv;
std::basic_ifstream<unsigned char> file("image.png", std::ios::binary);
file.seekg(0,std::ios::end);
int length = file.tellg();
file.seekg(0,std::ios::beg);
unsigned char* buffer = new unsigned char[length];
file.read(&buffer[0],length);
file.close();
HRESULT hr;
hr = DirectX::CreateWICTextureFromMemory(_D3D->GetDevice(), _D3D->GetDeviceContext(), &buffer[0], sizeof(buffer), nullptr, &srv, NULL);
As a return for the above code I get Component not found.
std::ifstream file;
ID3D11ShaderResourceView* srv;
file.open("../Assets/Textures/osg.png", std::ios::binary);
file.seekg(0,std::ios::end);
int length = file.tellg();
file.seekg(0,std::ios::beg);
std::vector<char> buffer(length);
file.read(&buffer[0],length);
file.close();
HRESULT hr;
hr = DirectX::CreateWICTextureFromMemory(_D3D->GetDevice(), _D3D->GetDeviceContext(), (const uint8_t*)&buffer[0], sizeof(buffer), nullptr, &srv, NULL);
The above code returns that the image format is unknown.
I'm clearly doing something wrong here, any help is greatly appreciated. Tried finding anything even similar on stackoverflow, and google to no avail.

Answer 1

Hopefully someone trying to do the same thing will find this solution.
Below is the code I used to solve this problem.
std::basic_ifstream<unsigned char> file("image.png", std::ios::binary);
if (file.is_open())
{
file.seekg(0,std::ios::end);
int length = file.tellg();
file.seekg(0,std::ios::beg);
unsigned char* buffer = new unsigned char[length];
file.read(&buffer[0],length);
file.close();
HRESULT hr;
hr = DirectX::CreateWICTextureFromMemory(_D3D->GetDevice(), _D3D->GetDeviceContext(), &buffer[0], (size_t)length, nullptr, &srv, NULL);
}
The important change being (size_t)length in CreateWICTextureFromMemory
It was indeed a stupid error.