fg_jpeghead()

Win32 DirectX Fastgraph/Light

Prototype

int fg_jpeghead (char *filename, void *header);

Function fg_jpeghead (ByVal filename As String, header() As Any) As Long

function fg_jpeghead (filename : string; var header) : integer;

Description

The fg_jpeghead() function reads a JPEG file header into a 10-byte buffer. Strictly speaking, JPEG files do not have formal headers, but fg_jpeghead() returns relevant information from the file's start of frame segment. We call it a header for consistency with other image file formats.

Parameters

filename is the name of the JPEG file. It may include a path specification and must be terminated by a zero byte.

header is the name of the 10-byte buffer to receive the JPEG file header.

Return value

0 = Success

-1 = The specified file does not exist

-2 = The specified file is not a baseline JPEG file

Restrictions

none

See also

fg_jpegsize(), fg_showjpeg()

Examples

Image, ImgProc