| DWORD GetFontData(hdc, dwTable, dwOffset, lpvBuffer, cbData) | |||||
| HDC hdc; | /* device-context handle | */ | |||
| DWORD dwTable; | /* metric table to query | */ | |||
| DWORD dwOffset; | /* offset into table being queried | */ | |||
| LPVOID lpvBuffer; | /* buffer for returned data | */ | |||
| DWORD cbData; | /* length of data to query | */ | |||
The GetFontData function retrieves font metric data from a scalable font file. The data to retrieve is identified by specifying an offset into the font file and the length of the data to return.
hdc
Identifies the device context.
dwTable
Specifies the name of the metric table to be returned. This parameter can be 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 table at which to 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, GetFontData returns zero.
lpvBuffer
Points to a buffer that receives the font information. If this parameter is NULL, the function returns the size of the buffer required for the font data specified in the dwTable parameter.
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.
The return value specifies the number of bytes returned in the buffer pointed to by the lpvBuffer parameter, or -1 if the function does not succeed.
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 and then retrieves the entire font file, specifying zero for the dwTable, dwOffset, and cbData parameters.
Applications can determine whether a 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 an application attempts to use this function to retrieve information for a non-TrueType font, the GetFontData function returns -1.
GetTextMetrics