内容讲义ni培训lesson development

1、Lesson 4 DevelopmentIntroductionAutomating Development TasksCode ReviewsA. IntroductionThe focus of this stage is development of the applicationFor the LabVIEW Architect, this stage involves:Implementing the software architectureSelecting or developing tools to assist programmers in developing the r

2、est of the projectConducting code reviews to evaluate the code that is developedRequirements GatheringDesignDevelopmentValidationDeploymentDevelopment DeliverablesTools for automating processesCode review documentationCompleted softwareB. Automating Development TasksWhy automate a development task?R

3、educe time spent by developers on common tasksEnsure that task is performed in the same way every timeRoles Regarding Automation ToolsLabVIEW architectDecide which development tasks will be automatedDevelop the tools to automate those tasksLabVIEW developerUse the automation tool throughout developm

4、entProvide feedback to the architect regarding functionality and usability of the toolCommon Development TasksCreating a LabVIEW projectSynchronization with source code controlRunning a build specificationDocumentation of VIsMethods of AutomationProject APIUsing VI Server to access LabVIEW functiona

5、lityVI ScriptingExpands the functionality available to VI ServerLabVIEW start-up wizards and assistantsProject APIProgrammatically accesses the LabVIEW ProjectContains a VI Server and ActiveX InterfaceProject API Use CasesTasks normally performed interactively with the Project ExplorerCreate a proje

6、ct Save and load a project from disk Add or delete a file or VI to or from the project Add or delete a folder to or from the project Use or modify a build specification of the project Class HierarchyClass HierarchyProjectProjectItemBuildSpecificationLibraryxControlLibraryTargetItemXML-Based Project

7、InformationExample of information stored in XML-based file (.lvproj)Project File XML SchemaProject API Create Project ExampleExample: Create a project with a folder and save the projectProject API Create Project Example XML FileExercise 4-1: Project Creation ToolUse the Project API to programmatical

8、ly create a new LabVIEW project.Exercise 4-1: Project Creation ToolIf a previously created VI also has a build script associated with it, that .bld file can be converted into a build specification for the LabVIEW project. The project API allows you perform nearly any method available with the LabVIE

9、W project. What about automatic creation of LabVIEW code?VI ScriptingExposes many additional VI Server classes, properties, and methodsCreate new VIsCreate front panel controlsCreate block diagram objects and wires Traverse diagram object hierarchies Modify codeInstalling VI ScriptingFeature is avai

10、lable for download from NI Developer Zone Downloads are available for:Windows XPWindows VistaMac OSXLinuxInstall and activate (for Windows) VI Scripting VI Scripting APIThree new VIs added to the Functions PaletteNew VIOpen VI Object ReferenceNew VI ObjectVI Scripting Sample Properties and MethodsVI

11、 ScriptingOpen and explore a VI scripting exampleVI Scripting HelpDocumentationmanualsVI Scripting Getting Started.pdfExamplesexamplesVIScriptingTechnical SupportAPI Community on NI Developer ZoneVI Scripting CaveatsTechnical SupportVI Scripting is an NI Labs productNI does not support LabVIEW Scrip

12、ting through Applications EngineeringAll technical issues should be posted on the API CommunityFuture Version SupportThe Scripting API is subject to change between LabVIEW versionsNo guarantees that any feature or behavior associated with the Scripting API will exist, migrate automatically, or have

13、a functionally equivalent behavior in different versions of LabVIEWLabVIEW Start-Up Wizards and AssistantsLabVIEW provides a number of wizards and assistants that can be used to reduce development timeDAQ AssistantInstrument I/O AssistantReal-Time Project WizardC. Code ReviewsOften conducted as a pe

14、er reviewInvolves taking others on a tour of your code“The best code reviews are the ones that actually get done.”Most problems will be found by the author while explaining the codeCode review A systematic examination of source code with the intent of finding and fixing mistakes that were overlooked

15、 during development. Benefits of a Code ReviewIdentify bugs and potential issues earlier in the product life cycleDevelopers improve their programming skills through feedbackAdditional people e familiar with the programCost of NOT Conducting a Code ReviewPotential problems may be missed until after

16、product releasesMaintenance of code es difficult if standards were not adhered toReadabilityScalabilityExcuses for Avoiding Code ReviewsEffort required to follow good coding practicesLack of consistency among code reviewersDeveloper does not have any peers who can review the codeTime involved in pre

17、paring for and performing a code reviewPreparing for a Code ReviewAdd descriptions and block diagram documentationEliminate performance issues and race conditionsUse programming style chosen by your organizationPreparation can be automated using VI AnalyzerEliminate as many problems as possible BEFO

18、RE the review!Choosing Your ReviewersReviews are most effective when both author and reviewers know LabVIEWBug fixes or minor changes Peer reviewNew application or features Manager reviewConducting a Code ReviewIs the code easy to maintain?What happens if the code returns an error?Is too much functi

19、onality located in a single VI?Have global or local variables been overused?Exercise 4-2: Code ReviewReview a code the implementation of a code module for the Theatre Light Control project.Exercise 4-2: Code ReviewIf you have assembled your own list of style and coding guidelines, you can use them i

20、n the place of the LabVIEW Style Checklist.What do we do with the information/corrections that we gather from the review?Post-Review TasksDocument any problems that were not fixed during the reviewCorrect these problems laterBug-tracking software is available online and in many project management to

21、olsFollow-up review after suggested changes have been implementedSummary QuizWhich of the following is the LabVIEW architect responsible for during development? (multiple answers)Designing the software architectureDeveloping application code modulesSelecting tools for automating common development t

22、asksOrganizing code reviewsSummary QuizWhich of the following is the LabVIEW architect responsible for during development? (multiple answers)Software architectureDeveloping application code modulesTools for automating common development tasksOrganizing code reviewsSummary QuizWhich of the following is an example of a task that