instantiating c++ category c# controlling p/invoke around pointer

i am importing createiceefilegen() duty unmanaged dll mscorpe.dll c# application, method beget pe file. duty advantage pointer an c++ vigilant , there any proceed i opening fields category around c# i need an unmanaged coupling dll?

the formula i'm controlling now follows:-

[dllimport(@"c:\windows\microsoft.net\framework\v2.0.50727\mscorpe.dll", entrypoint = "createiceefilegen")]
static extern vacant createiceefilegen(out intptr iceefilegenpointer);
...
intptr fileptr;
createiceefilegen(out fileptr);    

n.b.: i know identical things .net libraries nonetheless i need unmanaged libraries purposes.