your right it should really be as easy as that , like the test I did between two functions which worked no problem , but somehow I am missing something here ,maby the string in the class/structure should be converted . I don't know and that's why I am jumping on the delusional highway lol , I wil figure it out sooner or later .

I don't believe that I will really need it , because I stil have to try out skills ,if it turns out that I need it for some reason and I still couldn't figure out what I did wrong I wil simply resort to a dll function or two .

aaaaah and like magic I jumped on the issue without realising it , I took away the string in the packet class and dropped in a int value which should be supported across from c# to the engine dll and what do you know , tadaaa it works as it was supposed to .

so the conclusion : I need to marshal/convert the string or any unsupported members of the packet class ,or use different supported types .

so you used a string and no char array? lol

yup but I am sure I can still marshal it as an array or whatever (man I am really tired of writing marshal ) hurpy durpy

thanks for the help this was my solution