![]() Ask Javier questions on Twitter at on the Xojo Forum. He lives in Castellón, Spain and hosts regular Xojo hangouts en español. This example uses the Right function to return the last 5 characters from a String: Var result As String Var source As String 'Hello World' result source.Right(5) // returns 'World'. Javier Menendez is an engineer at Xojo and has been using Xojo since 1998. If you need to read bytes rather than characters, use the MemoryBlock class. You’ll probably want to move this property to the Session object in your Web projects so every connected user to the app can handle their own generated PDF documents.Īnd… that’s all! Run the project, click the button and see how it works. With the HTMLViewer1 control selected in the Layout Editor, click on the four lock icons under the Locking section from the associated Inspector Panel so they are closed.įinally, add the expected WebFile property to the Web page using the following values in the associated Inspector Panel: ![]() Next, drag the HTMLViewer control from the Library and drop it below the WebButton added in the previous step. Select the Web item in the Navigator again so it is visible in the Layout Editor. Now, add an HTMLViewer control to the Web page. And, finally, preview the PDF Document loading it in theĪs you can see here, this simple fragment of code is in charge of creating a sample PDF document, downloading it and also previewing it in an HTMLViewer instance. set the ForceDownload property back to False Because we want to display the PDF file in an HTMLViewer the Download method on our WebFile instance Frustrated by the current choice of offerings of UI controls by other third parties and the specific lack of certain controls I set out to create. What is XUI XUI (pronounced Zoo-ee) is a collection of gorgeous cross-platform user interface (UI) controls and helper/utility modules for Xojo. …so the file is, in effect, downloaded when calling Hello everyone, I’m really pleased to announce the immediate release of the XUI Desktop framework. It's important to set the right MIMEType for the file so assign that to the "data" property of the the inner contents of the PDF document at this point returns as a MemoryBlock (Direct conversion to String) This is the thing: the PDFDocument.ToData method Of course, as Xojo is a native multi-platform development environment, the FolderItem class is available for all the supported deployment platforms: desktop (macOS, Windows, Linux, Raspberry Pi), console, web or iOS. to the wf property added to the Web page Creating a new WebFile instance and assigning it Double click on the Container in the Library so it is added to the Navigator in the IDE. Here is where the **important** thing starts Creating the Base Container Open Xojo and create a new Desktop project. G.DrawText("Really simple PDF content", 20, 20) Next, add the Pressed Event Handler to it and type the following snippet of code in the associated Code Editor: // Nothing really interesting here ![]() In the associated Inspector Panel for the button change the following property: And since that is not something unexpected, relying on the KeyNotFoundException is unnecessary.To start, create a Web project, select Web in the Navigator and drop a WebButton from the Library onto the upper-center of the page in the Layout Editor. So if you do expect situations where a key may not be found then you can account for it with these methods. But you can avoid that by using either the Dictionary (to apply a default if the key is not found) or the Dictionary methods. If the key is not found you'll get a KeyNotFoundException. For example, with a Dictionary you use the Value method to fetch a value based on a key. One reason is that when testing, the Debugger is displayed for any event that is raised if you have "Break On Exceptions" enabled in the Project menu. Since exceptions are for unexpected behavior, if you are able to avoid an error by preventing the exception from occurring then it is more efficient to do so. To do this, select Project > Break On Exceptions in the menu so that it has a checkmark next to it. When an exception is encountered in your code, you can choose to have the Debugger displayed at the line causing the exception. The act of causing an exception to occur is called raising an exception.Īll exception are subclasses of the RuntimeException class. These errors will crash your application if you do not handle them in some way. Once you've found the source of errors, you want to make sure you handle them properly.Įxceptions are a type of error that occur when something unexpected happens. The debugger can help you verify that your code is working as you expect and it can help you find errors.
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