IPrintOemUni3::SetBandSize method (prcomoem.h)

Artikel
02/22/2024

The IPrintOemUni3::SetBandSize method can be used with Unidrv-supported printers to specify the desired band size on the printed output.

Syntax

HRESULT SetBandSize(
  [in] PDEVOBJ pdevobj,
  [in] INT     iFormat,
  [in] DWORD   dwPageWidthBytes,
  [in] DWORD   dwPageHeight,
  [in] DWORD   dwMaxHeight,
  [in] PDWORD  pdwRequiredHeight
);

Parameters

[in] pdevobj

A caller-supplied pointer to a DEVOBJ structure.

[in] iFormat

An integer value that specifies the format of the bitmap in terms of the number of bits of color information per pixel that are required. This parameter can be one of the following values.

Value	Meaning
BMF_1BPP	Monochrome
BMF_4BPP	4 bits per pixel
BMF_8BPP	8 bits per pixel
BMF_16BPP	16 bits per pixel
BMF_24BPP	24 bits per pixel
BMF_32BPP	32 bits per pixel
BMF_4RLE	4 bits per pixel; run length encoded
BMF_8RLE	8 bits per pixel; run length encoded

[in] dwPageWidthBytes

A Unidrv-supplied value that specifies the width of the printing area, in bytes.

[in] dwPageHeight

A Unidrv-supplied value that specifies the height of the printing area, in pixels.

[in] dwMaxHeight

A Unidrv-supplied value that specifies the maximum allowable height of the printing area, in pixels.

[in] pdwRequiredHeight

A caller-supplied pointer to a DWORD that contains the height of the printing area, in pixels, required by the rendering plug-in.

Return value

The method must return one of the following values:

Return code	Description
S_OK	The operation succeeded. See Note.
E_FAIL	The operation failed. See Note.
E_NOTIMPL	Unidrv should compute the banding size.

Remarks

This method is available in Windows Vista and later.

This method is used by a rendering plug-in to specify band size using the plug-in's own calculations, rather than using Unidrv's band size calculations.

You can disable banding operations by Unidrv by setting the dwPageHeight value to *pdwRequiredHeight, but you should consider the performance effect of the height value that the rendering plug-in requests. For rendering, Unidrv needs at least the amount of memory that is calculated by multiplying dwPageWidthBytes by *pdwRequiredHeight. If the rendering plug-in supports the IPrintOemUni::DriverDMS method and that method returns "S_OK", IPrintOemUni3::SetBandSize is not called.

If this method is defined and the printer's generic printer description (GPD) file indicates that preanalysis is disabled (the GPD file includes "*PreAnalysisOptions: 0"), Unidrv calls this method to calculate band size. For information about the PreAnalysisOptions attribute, see Preanalysis Infrastructure.

If the rendering plug-in supports IPrintOemUni::DriverDMS and that method returns S_OK, IPrintOemUni3::SetBandSize is not called.

Requirements

Requirement	Value
Target Platform	Desktop
Header	prcomoem.h (include Prcomoem.h)

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