在 2014年11月1日星期六UTC+8下午5时58分46秒，Bobby Holley写道： > I think you're probably out of luck - the method was de-COMed, and is now > not accessible from external C++ code. > > In generally, using nsIDOM* interfaces from external applications is > explicitly not supported. If you want to do DOM stuff, you should do so > from JS, and communicate with your JS code using a JS-implemented XPCOM > component. > > bholley > > On Sat, Nov 1, 2014 at 10:52 AM, <[email protected]> wrote: > > > 在 2014年11月1日星期六UTC+8下午4时40分57秒，David Rajchenbach-Teller写道： > > > I believe that the methods have migrated to > > > > > http://dxr.mozilla.org/mozilla-central/source/dom/xslt/xpath/XPathResult.h?from=XPathResult#47 > > > > > > Cheers, > > > David > > > > > > On 01/11/14 08:43, [email protected] wrote: > > > > Hi, > > > > > > > > Xulrunner 33.x is different from the former releases. I cannot compile > > my C++ XPCOMs because the new interface of nsIDOMXPathResult has not the > > methods to get the values. > > > > > > > > What should I do? > > > > _______________________________________________ > > > > dev-platform mailing list > > > > [email protected] > > > > https://lists.mozilla.org/listinfo/dev-platform > > > > > > > > > > > > > -- > > > David Rajchenbach-Teller, PhD > > > Performance Team, Mozilla > > > > After I have included the header file XPathResult.h, one compilation error > > appears as follows: > > > > xulrunner-sdk-33.0\include\nsStringFwd.h(15): fatal error C1189: #error > > : Internal string headers are not available from external-linkage code > > > > My xpcom is coded as follows: > > > > nsCOMPtr<nsISupports> results; > > rv = oEvaluator->Evaluate(path, checkDom, nsnull, > > nsIDOMXPathResult::BOOLEAN_TYPE, nsnull, getter_AddRefs(results)); > > if(NS_FAILED(rv)) { > > ...; > > } > > nsRefPtr<mozilla::dom::XPathResult> oResult = do_QueryObject(results); > > if(oResult == nsnull) { > > ... > > } > > mozilla::ErrorResult errorResult; > > bool boolVal = oResult->GetBooleanValue(errorResult); > > if(errorResult.Failed()) { > > ... > > }else if(!boolVal) { > > ... > > } > > > > The VC compiler tells me that the parameter "path" in the method > > Evaluate() can not be casted from nsAutoString to const nsAString. I guess > > it was the cause of the compilation error. > > > > Am I wrong somewhere? > > _______________________________________________ > > dev-platform mailing list > > [email protected] > > https://lists.mozilla.org/listinfo/dev-platform > >
What a terrible news! I have many C++ XPCOMs evaluating xpath expressions. They must be coded in C++ for high speed. Are there alternative nsIxxx interfaces for xpath evaluation? I guess it would be very costly to migrate the codes from C++ to javascript. Are there better ways? _______________________________________________ dev-platform mailing list [email protected] https://lists.mozilla.org/listinfo/dev-platform
