By default, _REPORTPREVIEW refers to ReportPreview.App, located in the main Visual FoxPro directory.

You can also specify an application to use in _REPORTPREVIEW using the File Locations tab in the Options dialog box. For more information, see File Locations Tab, Options Dialog Box.

The application in _REPORTPREVIEW is passed a NULL reference parameter, into which it must place an object reference to an instance of a class supporting the The Preview Container API. The application must then terminate, returning the Preview Container object reference:

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pc = .NULL. DO (_REPORTPREVIEW) WITH pc

The variable pc will now contain an object reference.

Consider the following statements:

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rl = NEWOBJECT("Reportlistener") rl.ListenerType = 1 REPORT FORM customers.frx OBJECT rl

When Visual FoxPro executes these commands, it checks the Reportlistener's PreviewContainer property for a valid object reference. If it does not find one, it obtains one by calling the _REPORTPREVIEW application.

Visual FoxPro will generate an error if it does not locate an application for _REPORTPREVIEW during a report preview.

Note
When distributing report preview factory programs with your applications, you may find it convenient to explicitly set _REPORTPREVIEW in the Visual FoxPro configuration file, Config.fpw. For more information, see Including Report Files for Distribution and Setting Configuration Options at Startup.

Reference