This function will be called during file operations when a READ is required.

Declaration:

typedef LONG (ACCUAPI LPFNIG_READ) ( 
        LONG fd, 
        LPBYTE lpBuffer, 
        LONG lSize 
);

Arguments:

Return Value:

Return the number of bytes read, or -1 to indicate that an error occurred.

Supported Raster Image Formats:

This function does not process image pixels.

Sample:

IOSET

Example:

See the example for function IG_file_IO_register().

Remarks:

This type of function is established by calling IG_file_IO_register() function.