// Create an ImageInput subclass instance that is able to read the given file and open it,
// returning the opened ImageInput if successful. If it fails, return error.
func OpenImageInput(filename string) (*ImageInput, error) {
c_str := C.CString(filename)
defer C.free(unsafe.Pointer(c_str))
cfg := unsafe.Pointer(nil)
ptr := C.ImageInput_Open(c_str, cfg)
in := newImageInput(ptr)
return in, in.LastError()
}
// Open file with given name. Return true if the file was found and opened okay.
func (i *ImageInput) Open(filename string) error {
i.Close()
deleteImageInput(i)
c_str := C.CString(filename)
defer C.free(unsafe.Pointer(c_str))
cfg := unsafe.Pointer(nil)
ptr := C.ImageInput_Open(c_str, cfg)
i.ptr = ptr
return i.LastError()
}