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If a buffer is shared as modifiable by the script and the script modifies it in an unexpected way, it could result in corrupted data that might even crash the application. If a buffer is shared to a untrusted site, possible sensitive information could be leaked. You should only share buffer with trusted site. Sharing a buffer to script has security risk. The underlying shared memory will be released when all the views are released. Each PostSharedBufferToScript will create a separate ArrayBuffer object with its own view of the memory and is separately released. The application can post the same shared buffer object to multiple web pages or iframes, or post to the same web page or iframe multiple times. The script code should call with the shared buffer as the parameter to release underlying resources as soon as it does not need access to the shared buffer any more. If the shared buffer is already closed, the API throws COMException with error code of RO_E_CLOSED. If the script tries to modify the content in a read only buffer, it will cause an access violation in WebView renderer process and crash the renderer process. If access is ReadOnly, the script will only have read access to the buffer. With a value set as chrome.webview object. This property will be undefined if additionalDataAsJson is nullptr or empty string. The event arg for that event will have the following methods and properties.Ī method that returns an ArrayBuffer object with the backing content from the shared buffer.Īn object as the result of parsing additionalDataAsJson as JSON string. The script will receive a sharedbufferreceived event from chrome.webview. ((CoreWebView2Frame)sender).PostSharedBufferToScript(buffer, CoreWebView2SharedBufferAccess.ReadOnly, additionalDataAsJson) ĪssertCondition(fileMappingHandle.IsInvalid = true, "FileMappingHandle of a disposed shared buffer should be invalid")

((CoreWebView2)sender).PostSharedBufferToScript(buffer, CoreWebView2SharedBufferAccess.ReadOnly, additionalDataAsJson)

Using (StreamWriter writer = new StreamWriter(stream)) Using (Stream stream = buffer.OpenStream())

Using (CoreWebView2SharedBuffer buffer = WebViewEnvironment.CreateSharedBuffer(bufferSize))įileMappingHandle = buffer.FileMappingHandle ĪssertCondition(fileMappingHandle.IsInvalid = false, "FileMappingHandle of a valid shared buffer should be valid") If it is not null or empty string, and it is not a valid JSON string, ArgumentException will be thrown.