GreQueryFontFileDescriptions

GreQueryFontFileDescriptions determines whether a file is a font file and, if so, returns the family and face names for the fonts in the file.

This function is supported by the graphics engine.

Syntax
GreQueryFontFileDescriptions(hdc, pszFileName, pcFonts, paszNames, pInstance, lFunction);

Parameters

 * hdc (HDC) - input
 * Device context handle.


 * pszFileName (PSZ) - input
 * Pointer to the file path and name of the font file.


 * pcFonts (PULONG) - input
 * Pointer.


 * Pointer to a count of the maximum number of family and face name pairs to be returned. On completion, this count is updated to the number of pairs actually returned.


 * paszNames (PSZ) - input
 * Pointer.


 * Pointer to an array of family and face name pairs whose size is 2 x pcFonts. The family name is the first in each pair.


 * pInstance (PVOID) - input
 * Pointer to instance data.


 * lFunction (ULONG) - input
 * High-order WORD=flags; low-order WORD=NGreQueryFontFileDescriptions.

Returns

 * rc (ULONG) - returns
 * Return codes.


 * This function returns the number of fonts not returned, or it returns GPI_ALTERROR if an error occurs.


 * Possible Errors Detected:  When an error is detected, the graphics engine calls WinSetErrorInfo to post the condition. Reasons for failure of this function include:


 * PMERR_BASE_ERROR
 * PMERR_INV_FONT_FILE_DATA


 * Refer to the "Error Explanations" section of the Presentation Manager Programming Reference for further explanation.

Sample

 * 1) define INCL_GRE_FONTS
 * 2) include 

HDC      hdc;          /*  Device context handle. */ PSZ      pszFileName;  /*  Pointer to the file path and name of the font file. */ PULONG   pcFonts;      /*  Pointer. */ PSZ      paszNames;    /*  Pointer. */ PVOID    pInstance;    /*  Pointer to instance data. */ ULONG    lFunction;    /*  High-order WORD=flags; low-order WORD=NGreQueryFontFileDescriptions.

*/ ULONG    rc;           /*  Return codes. */

rc = GreQueryFontFileDescriptions(hdc, pszFileName,      pcFonts, paszNames, pInstance, lFunction);

Remarks
The names are returned at the location addressed by paszNames. Typically, the calling routine calls GreQueryFontFileDescriptions twice. The first call sets pcFonts to 0 and determines the number of fonts in the file. When sufficient storage is allocated for the names, GreQueryFontFileDescriptions is called again with pcFonts pointing to the font count.