Load image from dll ressource file

[Daoudou]

hello

I want to know if it's possible to load a image png from a .dll with OpenSceneGraph ?
i load the png with the function LoadImage (yes i on MFC) but i don't know how to give it to OpenSceneGraph.

Thanks in advance

Daoudou

[robertosfield]

Try getting a pointer to the memory block then adapting this to a std::istream, then passing this to the to the appropriate RenderWriter::read(stream) method. Sorry it's a bit high level, I've not used the OSG in any significant capacity since 2018. For modern application development you are very likely better off using the OSG's successor the VSG.

[Daoudou]

Thanks

i tried to do this , i get the memory block to a std::istream. but it a little difficulte to passing to the appropriate RenderWriter::read(stream) ^^'

[Daoudou]

IT'S A SUCCESSSSSSS

i write it here if sommeone want to do the same thing :

`
HINSTANCE module = LoadLibrary(L"ressources3D.dll");
if (module == NULL)
{
cout << "Load of the dll, failed" << endl;
}
else
{
cout << "Load of the dll, success" << endl;

    HRSRC rsrc = FindResource(module, MAKEINTRESOURCE(IDB_PNG_TEST), L"PNG");
    if (!rsrc)
    {
        cout << "Load of the img from the dll, failed" << endl;
    }
    else
    {
        cout << "Load of the img from the dll, success" << endl;
        unsigned int myResourceSize = ::SizeofResource(module, rsrc);
        HGLOBAL myResourceData = ::LoadResource(module, rsrc);

        void* memoryOfPng = ::LockResource(myResourceData);
        size_t memory_file = SizeofResource(module, rsrc);
        string casted_memory(static_cast<char*>(memoryOfPng), memory_file);
        istringstream stream(casted_memory);

        osgDB::ReaderWriter* rw = osgDB::Registry::instance()->getReaderWriterForExtension("png");
        osgDB::ReaderWriter::ReadResult rr = rw->readImage(stream);
        if (rr.success())
            imgTest = rr.takeImage();
        
        cout << "test" << endl;
    }
}`