Re: [webkit-dev] KJS::JSObject question
On May 15, 2009, at 7:35 AM, Jack Wootton wrote: 4. Create the context: JSGlobalContextRef context = JSGlobalContextCreate(globalObjectClass); You will only do this if you’re using JavaScript outside of a web page. If you want to do this in conjunction with WebKit you’ll need to get the context from WebKit APIs. On Mac OS X the relevant API is - [WebFrame globalContext]. 1. Who should share the context? Is a single context used for a single webpage / frame? See my answer above. 2. Where do I define the class that will actually handle the implementation of any methods on my new object? I don’t understand the “where” question. Do it wherever makes sense in your program, and call JSClassCreate. Then when it's time to make an object, pass the JSClassRef to JSObjectMake. 3. The object has been made using JSObjectMake, but how is it added to WebKit? A common thing to do is to create an object and then put it in a property of the window object, which is the global object inside the web browser. That’s done on Mac OS X by implementing the webView:windowScriptObjectAvailable: method of the frame load delegate. The window script object is a WebScriptObject, and you can get the JSObject version of it by calling the JSObject method on it. Then you can set your object as a property of the window object with the JSObjectSetProperty function. -- Darin ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
[webkit-dev] building errors about cmd.exe
nbsp; nbsp;Hi, there's some errors when I built webkit on Windows following instructions on webkit.org. It seems to be something wrong with cmd.exe. I've read a lot of posts in this maillist, and found no solution for this kind of error. I post it again, hoping to move further. nbsp; Attached is my error info: nbsp; * 16-- Build started: Project: TestNetscapePlugin, Configuration: Release Win32 -- 16Performing Pre-Build Event... 16Project : error PRJ0002 : Error result 1 returned from 'c:\WINDOWS\system32\cmd.exe'. 16Project : warning PRJ0018 : The following environment variables were not found: 16$(PRODUCTION) 16Build log was saved at file://C:\cygwin\home\Administrator\WebKit\WebKitBuild\obj\TestNetscapePlugin\Release\BuildLog.htm 16TestNetscapePlugin - 1 error(s), 0 warning(s) 17-- Build started: Project: ImageDiff, Configuration: Release Win32 -- 17Performing Pre-Build Event... 17Project : error PRJ0002 : Error result 1 returned from 'c:\WINDOWS\system32\cmd.exe'. 17Project : warning PRJ0018 : The following environment variables were not found: 17$(PRODUCTION) 17Build log was saved at file://C:\cygwin\home\Administrator\WebKit\WebKitBuild\obj\ImageDiff\Release\BuildLog.htm 17ImageDiff - 1 error(s), 0 warning(s) 18-- Build started: Project: DumpRenderTree, Configuration: Release Win32 -- 18Performing Pre-Build Event... 18Project : error PRJ0002 : Error result 1 returned from 'c:\WINDOWS\system32\cmd.exe'. 18Project : warning PRJ0018 : The following environment variables were not found: 18$(PRODUCTION) 18Build log was saved at file://C:\cygwin\home\Administrator\WebKit\WebKitBuild\obj\DumpRenderTree\Release\BuildLog.htm 18DumpRenderTree - 1 error(s), 0 warning(s) == Build: 15 succeeded, 3 failed, 0 up-to-date, 0 skipped == = BUILD FAILED == Please ensure you have run WebKit/WebKitTools/Scripts/update-webkit to install depenedencies. You can view build errors by checking the BuildLog.htm files located at: /home/Administrator/WebKit/WebKitBuild/obj/project/config. *** nbsp; PS:nbsp; It'snbsp; really depressing these 3 errors occur at the very last, all the things before are fine. And another important thing is : if I run build-webkit again, I will get succeeded, the info is : nbsp; *** 1JavaScriptCoreGenerated - 0 error(s), 0 warning(s) 2-- Build started: Project: WebCoreGenerated, Configuration: Release Win32 -- 2Performing Makefile project actions 2make: Nothing to be done for `all'. 2make: Nothing to be done for `all'. 2Build log was saved at file://C:\cygwin\home\Administrator\WebKit\WebKitBuild\obj\WebCoreGenerated\Release\BuildLog.htm 2WebCoreGenerated - 0 error(s), 0 warning(s) 3-- Build started: Project: InterfacesGenerated, Configuration: Release Win32 -- 3Performing Makefile project actions 3make: Nothing to be done for `all'. 3Build log was saved at file://C:\cygwin\home\Administrator\WebKit\WebKitBuild\obj\InterfacesGenerated\Release\BuildLog.htm 3InterfacesGenerated - 0 error(s), 0 warning(s) 4-- Build started: Project: TestNetscapePlugin, Configuration: Release Win32 -- 4Performing Pre-Build Event... 4Compiling... 4### COMPILING 3 FILES USING AT MOST 2 PARALLEL INSTANCES OF cl.exe ### 4main.cpp 4TestObject.cpp 4PluginObject.cpp 4Compiling resources... 4Performing Pre-Link Event... 4Linking... 4nbsp;nbsp; Creating library C:\cygwin\home\Administrator\WebKit\WebKitBuild\lib\npTestNetscapePlugin.lib and object C:\cygwin\home\Administrator\WebKit\WebKitBuild\lib\npTestNetscapePlugin.exp 4Generating code 4Finished generating code 4Embedding manifest... 4Performing Post-Build Event... 4Project : warning PRJ0018 : The following environment variables were not found: 4$(PRODUCTION) 4Build log was saved at file://C:\cygwin\home\Administrator\WebKit\WebKitBuild\obj\TestNetscapePlugin\Release\BuildLog.htm 4TestNetscapePlugin - 0 error(s), 0 warning(s) 5-- Build started: Project: ImageDiff, Configuration: Release Win32 -- 5Performing Pre-Build Event... 5Compiling... 5### COMPILING 1 FILES USING AT MOST 2 PARALLEL INSTANCES OF cl.exe ### 5ImageDiffCG.cpp 5Performing Pre-Link Event... 5Linking... 5Generating code 5Finished generating code 5Embedding manifest... 5Performing Post-Build Event... 5Project : warning PRJ0018 : The following environment variables were not found: 5$(PRODUCTION) 5Build log was saved at file://C:\cygwin\home\Administrator\WebKit\WebKitBuild\obj\ImageDiff\Release\BuildLog.htm 5ImageDiff - 0 error(s), 0 warning(s) 6-- Build started: Project: DumpRenderTree, Configuration: Release Win32 -- 6Performing Pre-Build Event...
Re: [webkit-dev] JSObjectCallAsFunctionCallback question
Hi, Su Yes, this is the key point of the problem. In my program, many Object use the same staticFunc entry[Program Architecture]. So, in the getValue_cb callback function, we need do extra two things: 1.Get the Object name, here is myObject; [WE CAN NOW] 2.Get the propertyName of the method, here is getValues; [WE CAN NOT NOW] After both get the Object and method's name, we can identify another callback function. Therefore, implement a way to get the propertyName of the method via 'function object' is needed. Thanks. -Xiong On Fri, May 15, 2009 at 3:28 PM, Zhe Su james...@gmail.com wrote: AFAIK, there is no way to achieve what you want by using staticFunc structure. Of course, if you use different C functions for each staticFunc entry, you actually don't need the name. Regards James Su On Fri, May 15, 2009 at 3:24 PM, Xiong browse...@gmail.com wrote: Thanks Su. I think i know you mean. To get the method name [getValue] via attach a private data to function object which create by JSObjectMake(). Yes, it's a better way, but not for me. In my program, we have many Object and it's method and now all in staticFunc structure. Thanks again. -Xiong On Fri, May 15, 2009 at 11:57 AM, Zhe Su james...@gmail.com wrote: If you create a JSObject with JSObjectMake() function, you can have a private data associated to the newly created JSObject. You can store anything you want in the private data. So following approach might be feasible for you: 1. define a special JSClass for your function, which has finalize and callAsFunction set. In finalize() method, you need destroy the private data associated to the JSObject, if necessary. callAsFunction points to your getValue_cb. 2. create the getValue function object by calling JSObjectMake() with the function name getValue as private data. 3. attach the function object to myObject with name getValue. It might be done in myObject class's initialize() method. 4. in getValue_cb function you can retrieve the private data (which contains the name) by calling JSObjectGetPrivate(function). The only drawback of this approach: you can't declare the function statically in staticFunctions. Regards James Su On Fri, May 15, 2009 at 10:53 AM, Xiong browse...@gmail.com wrote: Thanks Darin. For the first problem, as you said, all the functions are objects, and also have **properties**. So,can we add a member for the function object to store the method name[here is getValues] in theoretical ? And this also like the JSObjectRef object variable in the callback prototype,we can get the class name like this: toJS(object)-className().data() Thanks. -Xiong On Fri, May 15, 2009 at 10:29 AM, Darin Adler da...@apple.com wrote: On May 14, 2009, at 7:03 PM, Xiong wrote: 1what is the purpose of the JSObjectRef function variable? In my case, we never use. It’s fine to not use this if you don’t need to. In JavaScript, functions are objects. Like other objects they can have properties. This argument is passed to your C implementation so that it can get access to properties of the function object if it has some reason to. In many cases there is no need to do this. 2In this function, i want to get the propertyName of the method, in this case, we need getValues, can be implemented ? No, there's no way to do that, for a good architectural reason. A JavaScript function is a first class object. Using JSObjectMake will create an object with a prototype that has functions stored in its properties, but there’s nothing to prevent the JavaScript program from taking that function and storing it somewhere else, in a property with another name. When the function is called, it’s just an object, and there’s no way to go back in time and find out where that object came from. Consider the similar situation of a data property. When you get the length of an array, it's a number 1, not a number 1 that knows it came from a property named length. -- Darin ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
