On Thursday, April 30, 2015 at 4:29:21 PM UTC+2, Jan Jongboom wrote:
> 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.
Solved it. I was not passing an nsIArray from JS side but a normal array.
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