How to disable printing in Cefsharp
By FoxLearn 6/29/2024 2:43:42 AM 332
Unfortunately, CefSharp does not provide a direct method to disable printing through properties. However, you can achieve this indirectly by modifying the command line arguments that are passed to Chromium (CEF's core).
Use the CommandLineArgsDisabled
property of CefSettings
to pass specific arguments to Chromium that disable printing features:
CefSettings settings = new CefSettings(); // Disable printing-related command line arguments settings.CefCommandLineArgs.Add("disable-print-preview", "1"); settings.CefCommandLineArgs.Add("disable-pdf-extension", "1"); // Initialize CefSharp with modified settings Cef.Initialize(settings);
Using disable-print-preview
to disable print preview functionality.
Using disable-pdf-extension
to disable the PDF extension which is used for printing to PDF.
Additionally, you can also interact with it using window.print
.
CefSettings settings = new CefSettings(); // Initialize cef with the provided settings Cef.Initialize(settings); ChromiumWebBrowser chromeBrowser = new ChromiumWebBrowser("www.foxlearn.com");
In CefSharp, you can attach a listener to every frame using the FrameLoadStart
event of the ChromiumWebBrowser
control. This event fires when a frame has finished loading.
chromeBrowser.FrameLoadEnd += (sender, args) => { // Check if the frame has finished loading successfully if (args.Frame.IsMain) { // Add a script to the frame to override window.print args.Frame.ExecuteJavaScriptAsync(@" window.print = function() { // Optionally, you can handle the print function differently here console.log('Printing is disabled.'); // Or you can just prevent any action return false; }; "); } };
You can attach a listener to every frame that is launched and remove the JavaScript window.print
default function.
/ Assign FrameLoadStart event listener chromeBrowser.FrameLoadStart += onFrameLoadStart; private void onFrameLoadStart(object sender, FrameLoadStartEventArgs args) { args.Frame.ExecuteJavaScriptAsync("window.print = function(){};"); }
To disable printing in CefSharp, you can attach a method to the FrameLoadStart
event. This method will execute plain JavaScript that overrides window.print
with an empty function, effectively disabling printing.
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