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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