gphoto2如何处理失焦警告

Question

以下是我如何用相机拍摄图像

import logging
import gphoto2 as gp
def main():
    def callback(level, domain, string, data=None):
        print('Callback: level =', level, ', domain =', domain, ', string =', string)
        if data:
            print('Callback data:', data)

    logging.basicConfig(
        format='%(levelname)s: %(name)s: %(message)s', level=logging.WARNING)
    callback_obj = gp.check_result(gp.use_python_logging())

    camera = gp.Camera()
    camera.init()
    try:
        camera_file_path = gp.check_result(camera.capture(gp.GP_CAPTURE_IMAGE))
    except gp.GPhoto2Error as ex:
        print("callback: ", ex, ex.code, ex.message, ex.string)
    camera.exit()

if __name__ == "__main__" : exit(main())

如果相机无法对焦，则会产生以下错误

...
WARNING: gphoto2: (ptp_usb_getresp [usb.c:466]) PTP_OC 0x90c8 receiving resp failed: Out of Focus (0xa002)
WARNING: gphoto2: (camera_nikon_capture [library.c:3153]) 'ret' failed: 'Out of Focus' (0xa002)
WARNING: gphoto2: (gp_context_error) Out of Focus
WARNING: gphoto2: (gp_camera_capture [gphoto2-camera.c:1340]) 'camera->functions->capture (camera, type, path, context)' failed: -1
('callback: ', GPhoto2Error('[-1] Unspecified error',), -1, '[-1] Unspecified error', 'Unspecified error')

异常错误代码为-1，但如何捕获Out of Focus警告

更新

从日志中筛选出不必要的错误

import logging
import gphoto2 as gp
from datetime import datetime
def main():
    def callback(level, domain, string, data=None):
        err_codes = ("(0x2005)", "(0x2019)")
        if not string.decode().endswith(err_codes):
            print("[{0}] {1}: {2}".format(datetime.utcnow(), domain.decode(), string.decode()))
        if data:
            print('Callback data:', data)

    callback_obj = gp.check_result(gp.gp_log_add_func(gp.GP_LOG_ERROR, callback))
    camera = gp.Camera()
    try:
        camera.init()
    except gp.GPhoto2Error as err:
        exit(err.code)

    try:
        camera_file_path = camera.capture(gp.GP_CAPTURE_IMAGE)
    except gp.GPhoto2Error as err:
        exit(err.code)
    camera.exit()

if __name__ == "__main__" : exit(main())

Answer 1

您已经定义了一个回调函数，在该函数中您可以解析错误字符串以检测失焦，但是您还没有安装回调，因此libgphoto2没有使用它。使用gp_log_add_func安装回调

另外，您正在将返回值camera.capture传递给gp.check_result。这是不正确的，因为camera.capture已经检查了结果，如果出现错误，将引发异常

Answer 2

如果您能够找出记录器的名称，那么您可以向其添加自己的处理程序并进行自己的日志处理

使用相机库的名称调用“getLogger”将获得记录器

使用自定义处理程序在该记录器上调用AddHandler将允许您对来自该记录器的日志进行自己的日志处理

请参阅Python's Logging Cookbook for more info

希望这有帮助