scanner.go

package grcode

// #cgo LDFLAGS: -lzbar
// #include <zbar.h>
import "C"

// Scanner is wrapper of zbar_image_scanner
type Scanner struct {
	image_scanner *C.zbar_image_scanner_t
}

// NewScanner returns new Scanner
func NewScanner() *Scanner {
	r := &Scanner{image_scanner: C.zbar_image_scanner_create()}
	// runtime.SetFinalizer() works well for automatically free()'ing cgo memory allocations!
	// the finalizer will be called when the garbage collector is invoked.
	// we can derfer destroy on our own
	// runtime.SetFinalizer(r, (*Scanner).Destroy)
	return r
}

// SetConfig sets scanner config
// 0 for success, non-0 for failure
func (s *Scanner) SetConfig(symbology C.zbar_symbol_type_t, config C.zbar_config_t, value int) int {
	return int(C.zbar_image_scanner_set_config(s.image_scanner, symbology, config, C.int(value)))
}

// Scan scans image, the image format must be "Y800" or "GRAY".
// returns:
// >0, if symbols were successfully decoded from the image
//  0, if no symbols were found or
// -1, if an error occurs
func (s *Scanner) Scan(img *ZbarImage) int {
	return int(C.zbar_scan_image(s.image_scanner, img.image))
}

// Close suicides
func (s *Scanner) Close() {
	C.zbar_image_scanner_destroy(s.image_scanner) // void function
}