Couldn't create nsIXMLHttpRequest instance! Source Code

[tanbo19820704]

In Firfox's Source TestNativeXMLHttpRequest.cpp
xhr Is Null
1
nsCOMPtr<nsIXMLHttpRequest> xhr =
do_CreateInstance(NS_XMLHTTPREQUEST_CONTRACTID, &rv);
TEST_ENSURE_SUCCESS(rv, "Couldn't create nsIXMLHttpRequest instance!");
NS_NAMED_LITERAL_CSTRING(getString, "GET");
NS_NAMED_LITERAL_CSTRING(testURL, TEST_URL);
const nsAString& empty = EmptyString();

printf("*** About to see an expected warning about mPrincipal:\n");
rv = xhr->OpenRequest(getString, testURL, PR_FALSE, empty, empty);
printf("*** End of expected warning output.\n");
TEST_ENSURE_FAILED(rv, "OpenRequest should have failed!");

2 Other Way
nsCOMPtr<nsIXMLHttpRequest> request = do_GetService(NS_XMLHTTPREQUEST_CONTRACTID, &rv);
The request is Null also

AnyBody Know how to Create nsIXMLHttpRequest instance?
My SDK IS Gecko_SDK 1.9.2

Thanks.


2010-09-13



tanbo19820704