LASERWRITER 8.7 DRIVER

This library is only available while the LaserWriter 8 Print Dialog is present. Similarly, there are cases where the nBytes parameter passed to psOutputFilterWrite is negative. LaserWriter 8 obtains the displayed version information from the ‘vers’ resource ID number 1. Lib” file provided with the sample code as part of building the filter. PostScript output filters are code fragments that live in the data fork of files that reside within the “Printing Plug-ins” folder contained in the Extensions folder. The section Filter Basics discusses how filters work with LaserWriter 8. At this point, a filter’s psOutputFilterPostFlight routine is called to allow the filter to dispose of any memory it allocated during its operation.

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The call to psOutputFilterPreFlight can be used for several purposes.

A given filter can add zero or more panels. If a filter exports the psOutputFilterPreFlight routine, this routine must return noErr ; otherwise, the filter is not added to the filter chain. The user interface programming interface for filters is described in detail in the section User Interface APIs.

Specifically, each filter has its own private Collection Manager collection in which to store the job settings from its UI code. Returning an error from psOutputFilterPreFlight does not affect the print job or any other filters; it just ensures that a filter does not run. Without any additional information, a filter would have to parse this data to determine its contents. LaserWriter 8 version 8. This routine is called only once per print job. These resources are optional, and, if either of these resources is not available, the information is indicated as unavailable.

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The ID field is an SInt Debugging that situation will be difficult because the filter cannot be loaded at filter output execution time if it has hard links to LW8UILiband therefore the filter output routines are not called. The phrase “filter output routines” refers to these routines.

Because the communication channel isn’t established and no job queries have been generated, the communication channel characteristics aren’t fully known.

It is also called each time a printer is deselected while the panel is visible. Filters must be careful to skip parsing of the laserwrter in this situation.

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If a filter wants to omit PostScript from the stream, it should not call psWriteNextFilter with that data but should instead return noErr. The user can save this set and order using the Save Settings button on the dialog. The routines specific to a given panel provide a lot of flexibility and power in order to allow a filter to configure itself and manage its user interface. The section Sample Code discusses the two sample filters provided as part of this technote.

The first phase occurs laseerwriter the communication channel is being opened and the chain of output lasegwriter is being constructed. PostScript output filters are code fragments that live in the data fork of files that reside within the “Printing Plug-ins” folder contained in the Extensions folder.

To accomplish this, LaserWriter 8 calls the filter’s psPanelRegister routine repeatedly until the filter indicates it wants to stop adding panels. At this point, a filter’s psOutputFilterPostFlight routine is called to allow the filter to dispose of any memory it allocated during its operation. The collection corresponding to the current printer’s defaults is available to a filter through the LWGetPrInfoCollection routine.

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If a filter is enabled by the user but the psPanelSetCriteria routine indicates a filter should not run, the remaining routines listed here are not executed. It is used to store a filter’s private hints collection into the job collection and printer defaults collection.

A PSPosition structure allows generators of PostScript output to communicate structural information about the data they are writing. Log In Not a Member? As with all of the LaserWriter 8 settings in the Print Dialog, the settings in this panel are saved on a printer-by-printer basis. This routine also requires a filter to specify the data needed for each panel.

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LaserWriter 8 calls this routine to lqserwriter the filter to configure itself for the print job dialog. The second phase occurs when data is being written to the output filter chain. The data if any pointed to by the info value coincides with the data being written to the output stream. This means that no data can be written during execution of psOutputFilterPreFlight.