GetFontData

The GetFontData function retrieves font metric data for a TrueType font.

DWORD GetFontData(

HDC hdc,	// handle of device context
DWORD dwTable,	// metric table to query
DWORD dwOffset,	// offset into table being queried
LPVOID lpvBuffer,	// address of buffer for returned data
DWORD cbData	// length of data to query
);

Parameters

hdc

Identifies the device context.

dwTable

Specifies the name of a font metric table from which the font data is to be retrieved. This parameter can identify one of the metric tables documented in the TrueType Font Files specification published by Microsoft Corporation. If this parameter is zero, the information is retrieved starting at the beginning of the font file.

dwOffset

Specifies the offset from the beginning of the font metric table to the location where the function should begin retrieving information. If this parameter is zero, the information is retrieved starting at the beginning of the table specified by the dwTable parameter. If this value is greater than or equal to the size of the table, an error occurs.

lpvBuffer

Points to a buffer to receive the font information. If this parameter is NULL, the function returns the size of the buffer required for the font data.

cbData

Specifies the length, in bytes, of the information to be retrieved. If this parameter is zero, GetFontData returns the size of the data specified in the dwTable parameter.

Return Values

If the function succeeds, the return value is the number of bytes returned.

If the function fails, the return value is GDI_ERROR.

Remarks

An application can sometimes use the GetFontData function to save a TrueType font with a document. To do this, the application determines whether the font can be embedded by checking the otmfsType member of the OUTLINETEXTMETRIC structure. If bit 1 of otmfsType is set, embedding is not permitted for the font. If bit 1 is clear, the font can be embedded. If bit 2 is set, the embedding is read-only. If embedding is permitted, the application can retrieve the entire font file, specifying zero for the dwTable, dwOffset, and cbData parameters.

If an application attempts to use this function to retrieve information for a non-TrueType font, an error occurs.

See Also

GetTextMetrics, OUTLINETEXTMETRIC

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