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How Can I Allow Website to Access Local File System in CEFSharp WPF?

I'm writing a wpf app with an integrated CEFSharp webbrowser control, and I've hit a snag on a website. This website needs access to the local file system, but I'm not sure how or where to catch this on the backend and grant access. I've implemented IRequestHandler and IResourceRequestHandler, but I'm not sure what else to do.
Here's the error from the website:
Somehow, Chrome catches and handles it:
I would like to handle it in a similar fashion. Any help is appreciated.

If I am reading the documentation on the Chrome browser correctly, it seems as if Chromium is calling chrome.fileSystem.requestFileSystem(object options, function callback) automatically.
I would think if you want to handle this manually, you would need too prompt the user for this permission/action, meaning do that same API call from inside the Chromium client in CEFSharp.

Thank you, #amaitland and #Jimenemex for your responses. They really did get me going in the right direction. In the end, I needed to catch the file system request in the IRequestHandler's "OnQuotaRequest" event. The following code solved my issue:
public bool OnQuotaRequest(IWebBrowser chromiumWebBrowser, IBrowser browser, string originUrl, long newSize,
IRequestCallback callback)
{
string askingURL = Helper.GetWebsiteName(originUrl);
var infoWindow = new InformationWindow("", "Allow " + askingURL, "to store files on this device?");
infoWindow.OkButton.Visibility = Visibility.Hidden;
infoWindow.YesButton.Visibility = Visibility.Visible;
infoWindow.NoButton.Visibility = Visibility.Visible;
infoWindow.Topmost = true;
if (infoWindow.ShowDialog() == true)
{
callback.Continue(true);
return true;
}
return false;
}

Silverlight passing an array to a web page's dialog arguments

I have the following line of code to open a web page modal dialog in C# (Silverlight):
var so = (ScriptObject)HtmlPage.Window.Invoke(
"showModalDialog",
modalWindowUrl,
dialogArgs,
"dialogWidth:600px;dialogHeight:600px;");
Now, code similar to the following is being called on the page I am displaying, and I need to make sure it gets the values I'm trying to pass in (this is a MSCRM web page I don't have control over):
dialogArgs.items <-- will be an array I pass in
dialogArgs.items[i].getAttribute("oid") <-- will return something
dialogArgs.items[i].getAttribute("otype") <-- will return something
dialogArgs.items[i].values <-- will return something
What I have tried to send in (from my C# code) is this:
dialogArgs = #"{items:[{oid:" + id + ",otype:" + type + "}]}";
which will result in a JSON string... but I'm guessing this just ends up as a string within the JavaScript and not a JSON object.
Any ideas how I get this to work?
A few side notes:
I can't get IE to debug the modal dialog that results from this call. I can get the debugging tools displaying, but it won't attach to the page because it cannot refresh it.
I don't have control over this modal dialog. It's a page that is displayed using MS Dynamics CRM. For that reason I cannot mess with the JavaScript or anything to test stuff.

Looks like I won the tumbleweed award for this one! Can't believe how uncommon this scenario seems to be. The solution ended up being quite simple, but not very documented so took me a while to track down. Thought I would share here.
Firstly, a quick search across the internet reveals that we can set this up using the following:
var dialogArgs = HtmlPage.Window.CreateInstance("Object");
Which gives you a ScriptObject back. For properties:
dialogArgs.SetProperty("items", items);
Some code for setting up an array and an item should look something like this (I have just created a new GUID for the purpose of this example):
var item = HtmlPage.Window.CreateInstance("Object");
item.SetProperty("oid", Guid.NewGuid());
item.SetProperty("otype", "account");
var items = HtmlPage.Window.CreateInstance("Object");
items.SetProperty(0, item);
And finally, just pass that object straight into your dialog window like this:
var so = (ScriptObject)HtmlPage.Window.Invoke("showModalDialog", lookUpWindow, dialogArgs, "dialogWidth:600px;dialogHeight:600px;");

I must be a heretic for wanting a C# browser with both NewWindow2 and GetElementsByTagName

You can't have your cake and eat it too, apparently.
I'm currently using the System.Windows.Forms.WebBrowser in my application. The program currently depends on using the GetElementsByTagName function. I use it to gather up all the elements of a certain type (either "input"s or "textarea"s), so I can sort through them and return the value of a specific one. This is the code for that function (my WebBrowser is named web1):
// returns the value from a element.
public String FetchValue(String strTagType, String strName)
{
HtmlElementCollection elems;
HtmlDocument page = web1.Document.Window.Frames[1].Document;
elems = page.GetElementsByTagName(strTagType);
foreach (HtmlElement elem in elems)
{
if (elem.GetAttribute("name") == strName ||
elem.GetAttribute("ref") == strName)
{
if (elem.GetAttribute("value") != null)
{
return elem.GetAttribute("value");
}
}
}
return null;
}
(points to note: the webpage I need to pull from is in a frame, and depending on circumstances, the element's identifying name will be either in the name or the ref attribute)
All of that works like a dream with the System.Windows.Forms.WebBrowser.
But what it is unable to do, is redirect the opening of a new window to remain in the application. Anything that opens in a new window shoots to the user's default browser, thus losing the session. This functionality can be easily fixed with the NewWindow2 event, which System.Windows.Forms.WebBrowser doesn't have.
Now forgive me for being stunned at its absence. I have but recently ditched VB6 and moved on to C# (yes VB6, apparently I am employed under a rock), and in VB6, the WebBrowser possessed both the GetElementsByTagName function and the NewWindow2 event.
The AxSHDocVw.WebBrowser has a NewWindow2 event. It would be more than happy to help me route my new windows to where I need them. The code to do this in THAT WebBrowser is (frmNewWindow being a simple form containing only another WebBrowser called web2 (Dock set to Fill)):
private void web1_NewWindow2(
object sender,
AxSHDocVw.DWebBrowserEvents2_NewWindow2Event e)
{
frmNewWindow frmNW = new frmNewWindow();
e.ppDisp = frmNW.web2.Application;
frmNW.web2.RegisterAsBrowser = true;
frmNW.Visible = true;
}
I am unable to produce on my own a way to replicate that function with the underwhelming regular NewWindow event.
I am also unable to figure out how to replicate the FetchValue function I detailed above using the AxSHDocVw.WebBrowser. It appears to go about things in a totally different way and all my knowledge of how to do things is useless.
I know I'm a sick, twisted man for this bizarre fantasy of using these two things in a single application. But can you find it in your heart to help this foolish idealist?

I could no longer rely on the workaround, and had to abandon System.Windows.Forms.WebBrowser. I needed NewWindow2.
I eventually figured out how to accomplish what I needed with the AxWebBrowser. My original post was asking for either a solution for NewWindow2 on the System.Windows.Forms.WebBrowser, or an AxWebBrowser replacement for .GetElementsByTagName. The replacement requires about 4x as much code, but gets the job done. I thought it would be prudent to post my solution, for later Googlers with the same quandary. (also in case there's a better way to have done this)
IHTMLDocument2 webpage = (IHTMLDocument2)webbrowser.Document;
IHTMLFramesCollection2 allframes = webpage.frames;
IHTMLWindow2 targetframe = (IHTMLWindow2)allframes.item("name of target frame");
webpage = (IHTMLDocument2)targetframe.document;
IHTMLElementCollection elements = webpage.all.tags("target tagtype");
foreach (IHTMLElement element in elements)
{
if (elem.getAttribute("name") == strTargetElementName)
{
return element.getAttribute("value");
}
}
The webbrowser.Document is cast into an IHTMLDocument2, then the IHTMLDocument2's frames are put into a IHTMLFramesCollection2, then I cast the specific desired frame into an IHTMLWindow2 (you can choose frame by index # or name), then I cast the frame's .Document member into an IHTMLDocument2 (the originally used one, for convenience sake). From there, the IHTMLDocument2's .all.tags() method is functionally identical to the old WebBrowser.Document.GetElementsByTagName() method, except it requires an IHTMLElementCollection versus an HTMLElementCollection. Then, you can foreach the collection, the individual elements needing to be IHTMLElement, and use .getAttribute to retrieve the attributes. Note that the g is lowercase.

The WebBrowser control can handle the NewWindow event so that new popup windows will be opened in the WebBrowser.
private void webBrowser1_NewWindow(object sender, CancelEventArgs e)
{
// navigate current window to the url
webBrowser1.Navigate(webBrowser1.StatusText);
// cancel the new window opening
e.Cancel = true;
}
http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/361b6655-3145-4371-b92c-051c223518f2/

The only solution to this I have seen was a good few years ago now, called csExWb2, now on Google code here.
It gives you an ExWebBrowser control, but with full-on access to all the interfaces and events offered by IE. I used it to get deep and dirty control of elements in a winforms-hosted html editor.
It may be a bit of a leap jumping straight into that, mind.

Webbrowser control is not showing Html but shows webpage

I am automating a task using webbrowser control , the site display pages using frames.
My issue is i get to a point , where i can see the webpage loaded properly on the webbrowser control ,but when it gets into the code and i see the html i see nothing.
I have seen other examples here too , but all of those do no return all the browser html.
What i get by using this:
HtmlWindow frame = webBrowser1.Document.Window.Frames[1];
string str = frame.Document.Body.OuterHtml;
Is just :
The main frame tag with attributes like SRC tag etc, is there any way how to handle this?Because as i can see the webpage completely loaded why do i not see the html?AS when i do that on the internet explorer i do see the pages source once loaded why not here?
ADDITIONAL INFO
There are two frames on the page :
i use this to as above:
HtmlWindow frame = webBrowser1.Document.Window.Frames[0];
string str = frame.Document.Body.OuterHtml;
And i get the correct HTMl for the first frame but for the second one i only see:
<FRAMESET frameSpacing=1 border=1 borderColor=#ffffff frameBorder=0 rows=29,*><FRAME title="Edit Search" marginHeight=0 src="http://web2.westlaw.com/result/dctopnavigation.aspx?rs=WLW12.01&ss=CXT&cnt=DOC&fcl=True&cfid=1&method=TNC&service=Search&fn=_top&sskey=CLID_SSSA49266105122&db=AK-CS&fmqv=s&srch=TRUE&origin=Search&vr=2.0&cxt=RL&rlt=CLID_QRYRLT803076105122&query=%22LAND+USE%22&mt=Westlaw&rlti=1&n=1&rp=%2fsearch%2fdefault.wl&rltdb=CLID_DB72585895122&eq=search&scxt=WL&sv=Split" frameBorder=0 name=TopNav marginWidth=0 scrolling=no><FRAME title="Main Document" marginHeight=0 src="http://web2.westlaw.com/result/dccontent.aspx?rs=WLW12.01&ss=CXT&cnt=DOC&fcl=True&cfid=1&method=TNC&service=Search&fn=_top&sskey=CLID_SSSA49266105122&db=AK-CS&fmqv=s&srch=TRUE&origin=Search&vr=2.0&cxt=RL&rlt=CLID_QRYRLT803076105122&query=%22LAND+USE%22&mt=Westlaw&rlti=1&n=1&rp=%2fsearch%2fdefault.wl&rltdb=CLID_DB72585895122&eq=search&scxt=WL&sv=Split" frameBorder=0 borderColor=#ffffff name=content marginWidth=0><NOFRAMES></NOFRAMES></FRAMESET>
UPDATE
The two url of the frames are as follows :
Frame1 whose html i see
http://web2.westlaw.com/nav/NavBar.aspx?RS=WLW12.01&VR=2.0&SV=Split&FN=_top&MT=Westlaw&MST=
Frame2 whose html i do not see:
http://web2.westlaw.com/result/result.aspx?RP=/Search/default.wl&action=Search&CFID=1&DB=AK%2DCS&EQ=search&fmqv=s&Method=TNC&origin=Search&Query=%22LAND+USE%22&RLT=CLID%5FQRYRLT302424536122&RLTDB=CLID%5FDB6558157526122&Service=Search&SRCH=TRUE&SSKey=CLID%5FSSSA648523536122&RS=WLW12.01&VR=2.0&SV=Split&FN=_top&MT=Westlaw&MST=
And the properties of the second frame whose html i do not get are in the picture below:
Thank you

I paid for the solution of the question above and it works 100 %.
What i did was use this function below and it returned me the count to the tag i was seeking which i could not find :S.. Use this to call the function listed below:
FillFrame(webBrowser1.Document.Window.Frames);
private void FillFrame(HtmlWindowCollection hwc)
{
if (hwc == null) return;
foreach (HtmlWindow hw in hwc)
{
HtmlElement getSpanid = hw.Document.GetElementById("mDisplayCiteList_ctl00_mResultCountLabel");
if (getSpanid != null)
{
doccount = getSpanid.InnerText.Replace("Documents", "").Replace("Document", "").Trim();
break;
}
if (hw.Frames.Count > 0) FillFrame(hw.Frames);
}
}
Hope it helps people .
Thank you

For taking html you have to do it that way:
WebClient client = new WebClient();
string html = client.DownloadString(#"http://stackoverflow.com");
That's an example of course, you can change the address.
By the way, you need using System.Net;

This works just fine...gets BODY element with all inner elements:
Somewhere in your Form code:
wb.Url = new Uri("http://stackoverflow.com");
wb.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wbDocumentCompleted);
And here is wbDocumentCompleted:
void wb1DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
var yourBodyHtml = wb.Document.Body.OuterHtml;
}
wb is System.Windows.Forms.WebBrowser
UPDATE:
The same as for the document, I think that your second frame is not loaded at the time you check for it's content...You can try solutions from this link. You will have to wait for your frames to be loaded in order to see its content.

The most likely reason is that frame index 0 has the same domain name as the main/parent page, while the frame index 1 has a different domain name. Am I correct?
This creates a cross-frame security issue, and the WB control just leaves you high and dry and doesn't tell you what on earth went wrong, and just leaves your objects, properties and data empty (will say "No Variables" in the watch window when you try to expand the object).
The only thing you can access in this situation is pretty much the URL and iFrame properties, but nothing inside the iFrame.
Of course, there are ways to overcome teh cross-frame security issues - but they are not built into the WebBrowser control, and they are external solutions, depending on which WB control you are using (as in, .NET version or pre .NET version).
Let me know if I have correctly identified your problem, and if so, if you would like me to tell you about the solution tailored to your setup & instance of the WB control.
UPDATE: I have noticed that you're doing a .getElementByTagName("HTML")(0).outerHTML to get the HTML, all you need to do is call this on the document object, or the .body object and that should do it. MyDoc.Body.innerHTML should get the the content you want. Also, notice that there are additional iFrames inside these documents, in case that is of relevance. Can you give us the main document URL that has these two URL's in it so we / I can replicate what you're doing here? Also, not sure why you are using DomElement but you should just cast it to the native object it wants to be cast to, either a IHTMLDocument2 or the object you see in the watch window, which I think is IHTMLFrameElement (if i recall correctly, but you will know what i mean once you see it). If you are trying to use an XML object, this could be the reason why you aren't able to get the HTML content, change the object declaration and casting if there is one, and give it a go & let us know :). Now I'm curious too :).

How to send JavaScript code to IE using C# (.Net 3.5), run it, then get a string return value from the JS code?

We are developing an application which needs to interact with the active document in IE.
Context: The app is a C#, .Net 3.5 desktop app. The goal is to highlight specific text elements in the web page on user request. For this we need to retrieve and interpret web page elements (the need for the return value) then act on them through another JS call. The operations that must be made in the web page are not all done at the same time so we must get some kind of "snapshot" of the interesting text elements (we do this on the Mac version of our app by returning a string containing an XML representation of those elements).
In .Net we used IHTMLDocument2's execScript method successfully to run some JavaScript inside the active IE document, but we can't seem to find a way to get a return value from the call. Based on the doc execScript returns an execution success/failure constant which is not what we need.
In essence what we need to do is to load some JavaScript from a text file into a string, then send it to IE for execution. Then we need to get a string back from the called script.
Any hints on what objects to use? How to proceed to get this functionality?
Thanks in advance!
My colleague found the solution, based on what Alun Harford said:
string jsToRun = "function myTest() { return document.title; } myTest();";
mshtml.IHTMLDocument2 myIHTMLDocument2 = GetSelectedIEWindow();
IE ie = IE.AttachToIE(Find.ByUrl(myIHTMLDocument2.url));
string jsReturn = ie.Eval(jsToRun);
jsReturn then contains the string value returned from myTest() in JavaScript. Note that there is no return before the myTest() function call in the script!

Have a look at the WatiN codebase. In there, IE.Eval does exactly what you're looking for.

If you are providing the html and script yourself you can do the following:
execute the javascript function
let the js function place the result in an html element
wait till the function is done running
retrieve the html element using document.getElementById
and retrieve the value
I'm not sure if there's a easier way to do this.

Well it is nasty but it can be done.
Try this:
[Guid("626FC520-A41E-11CF-A731-00A0C9082637"), InterfaceType(ComInterfaceType.InterfaceIsDual)]
interface IHTMLDocument
{
void Script([Out, MarshalAs(UnmanagedType.Interface)] out object ppScript);
}
public object RunScript(InternetExplorer ie, string scriptText)
{
IHTMLDocument doc = (IHTMLDocument)ie.Document;
object scriptObj;
doc.Script(out scriptObj);
Type t = scriptObj.GetType();
return t.InvokeMember("eval", System.Reflection.BindingFlags.InvokeMethod, null, scriptObj, new object[] { scriptText });
}
That will return your value in the object (just cast to what ever type you expected). Of course .NET 4 makes this even easier ;)