String array from JS -> C++ via IDL

[janjongboom]

I have an IDL file and I want to add a new attribute that contains an array of 
strings. The interface is implemented in JavaScript and I'm writing C++ code.

IDL:

readonly attribute nsIArray osPaths; // DOMString[]

Consuming in C++:

    nsCOMPtr<nsIArray> bla;
    app->GetOsPaths(getter_AddRefs(bla));
        
    uint32_t length;
    bla->GetLength(&length);
    printf("Length=%d\n", length);

All OK. Prints 'Length=1' when I add one element in the array. But now... how 
do I get the strings out of here. I found do_QueryElement and it's nsISupports* 
friends, but none of them say they can handle it...

    for (uint32_t j = 0; j < length; ++j) {
      nsCOMPtr<nsISupportsPrimitive> isp = do_QueryElementAt(bla, j);
      nsCOMPtr<nsISupportsCString> iscs = do_QueryElementAt(bla, j);
      nsCOMPtr<nsISupportsString> iss = do_QueryElementAt(bla, j);
      nsCOMPtr<nsISupportsPRBool> isb = do_QueryElementAt(bla, j);
      nsCOMPtr<nsISupportsPRUint8> isu8 = do_QueryElementAt(bla, j);
      nsCOMPtr<nsISupportsPRUint16> isu16 = do_QueryElementAt(bla, j);
      nsCOMPtr<nsISupportsPRUint32> isu32 = do_QueryElementAt(bla, j);
      nsCOMPtr<nsISupportsChar> isc = do_QueryElementAt(bla, j);
      nsCOMPtr<nsISupportsPRInt16> isi16 = do_QueryElementAt(bla, j);
      nsCOMPtr<nsISupportsPRInt32> isi32 = do_QueryElementAt(bla, j);
      nsCOMPtr<nsISupportsFloat> isf = do_QueryElementAt(bla, j);
      nsCOMPtr<nsISupportsDouble> isd = do_QueryElementAt(bla, j);
      nsCOMPtr<nsISupportsInterfacePointer> isip = do_QueryElementAt(bla, j);
      
      printf("isp=%d ", !!isp);
      printf("iscs=%d ", !!iscs);
      printf("iss=%d ", !!iss);
      printf("isb=%d ", !!isb);
      printf("isu8=%d ", !!isu8);
      printf("isu16=%d ", !!isu16);
      printf("isu32=%d ", !!isu32);
      printf("isc=%d ", !!isc);
      printf("isi16=%d ", !!isi16);
      printf("isi32=%d ", !!isi32);
      printf("isf=%d ", !!isf);
      printf("isd=%d ", !!isd);
      printf("isip=%d ", !!isip);
      printf("\n");
    }

Result: isp=0 iscs=0 iss=0 isb=0 isu8=0 isu16=0 isu32=0 isc=0 isi16=0 isi32=0 
isf=0 isd=0 isip=0

So what type is in here, and how can I get it out of the array? I just want 
normal nsString objects.
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