func (c *Camera) FileReader(folder string, fileName string) io.ReadCloser {
cfr := new(cameraFileReader)
cfr.camera = c
cfr.folder = folder
cfr.fileName = fileName
cfr.offset = 0
cfr.closed = false
cFileName := C.CString(cfr.fileName)
cFolderName := C.CString(cfr.folder)
defer C.free(unsafe.Pointer(cFileName))
defer C.free(unsafe.Pointer(cFolderName))
C.gp_file_new(&cfr.cCameraFile)
C.gp_camera_file_get(c.camera, cFolderName, cFileName, C.GP_FILE_TYPE_NORMAL, cfr.cCameraFile, c.context)
var cSize C.ulong
C.gp_file_get_data_and_size(cfr.cCameraFile, &cfr.cBuffer, &cSize)
cfr.fullSize = uint64(cSize)
return cfr
}
//DownloadImage saves image pointed by path to the provided buffer. If leave on camera is set to false,the file will be deleted from the camera internal storage
func (file *CameraFilePath) DownloadImage(buffer io.Writer, leaveOnCamera bool) error {
gpFile, err := newGpFile()
if err != nil {
return err
}
defer C.gp_file_free(gpFile)
fileDir := C.CString(file.Folder)
defer C.free(unsafe.Pointer(fileDir))
fileName := C.CString(file.Name)
defer C.free(unsafe.Pointer(fileName))
if retval := C.gp_camera_file_get(file.camera.gpCamera, fileDir, fileName, FileTypeNormal, gpFile, file.camera.gpContext); retval != gpOk {
return fmt.Errorf("Cannot download photo file, error code :%v", retval)
}
err = getFileBytes(gpFile, buffer)
if err != nil && leaveOnCamera == false {
C.gp_camera_file_delete(file.camera.gpCamera, fileDir, fileName, file.camera.gpContext)
}
return err
}