IPrintOemUni::DownloadCharGlyph method (prcomoem.h)

Artikel
10/21/2021

The IPrintOemUni::DownloadCharGlyph method enables a rendering plug-in for Unidrv to send a character glyph for a specified soft font to the printer.

Syntax

HRESULT DownloadCharGlyph(
        PDEVOBJ     pdevobj,
        PUNIFONTOBJ pUFObj,
        HGLYPH      hGlyph,
        PDWORD      pdwWidth,
  [out] OUT DWORD   *pdwResult
);

Parameters

pdevobj

Caller-supplied pointer to a DEVOBJ structure.

pUFObj

Caller-supplied pointer to a UNIFONTOBJ structure.

hGlyph

Caller-supplied glyph handle.

pdwWidth

Caller-supplied pointer to receive the method-supplied width of the character.

[out] pdwResult

Receives a method-supplied value representing the amount of printer memory, in bytes, required to store the character glyph. If the operation fails, the returned value should be zero.

Return value

The method must return one of the following values.

Return code	Description
S_OK	The operation succeeded.
E_FAIL	The operation failed
E_NOTIMPL	The method is not implemented.

Remarks

The IPrintOemUni::DownloadCharGlyph method is used for supporting soft fonts on printers that do not accept PCL commands. Its purpose is to enable a rendering plug-in to send a character glyph to the printer.

If a rendering plug-in implements the IPrintOemUni::DownloadCharGlyph method, Unidrv calls the method immediately after sending the command string specified by the CmdSetCharCode command entry, which is contained in the printer's GPD file. (GPD files are described in Microsoft Universal Printer Driver.) The method should do the following:

Call the UNIFONTOBJ_GetInfo function to obtain the glyph image specified by hGlyph.
Call IPrintOemDriverUni::DrvWriteSpoolBuf to send the glyph to the printer.
Call the UNIFONTOBJ_GetInfo function again to obtain the glyph's width, then store the width in the address pointed to by pdwWidth.
Return the amount of printer memory required to store the glyph by placing it in the location specified by pdwResult.

The IPrintOemUni::DownloadCharGlyph method is optional. If a rendering plug-in implements this method, the plug-in's IPrintOemUni::GetImplementedMethod method must return S_OK when it receives "DownloadCharGlyph" as input.

If you implement the IPrintOemUni::DownloadCharGlyph method, you must also implement the IPrintOemUni::DownloadFontHeader method.

For additional information see Customized Font Management.

Requirements

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

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