[英]ROS cv_bridge in a class leads to segfault when cv_ptr->image is accessed
I'm having an issue where when I get my const sensor_msgs::ImageConstPtr &msg
in my callback function, and do a cv_ptr = cv_bridge::toCvCopy(msg, sensor_msgs::image_encodings::RGB8);
我遇到一个问题,当我在回调函数中获取我的
const sensor_msgs::ImageConstPtr &msg
并执行cv_ptr = cv_bridge::toCvCopy(msg, sensor_msgs::image_encodings::RGB8);
where cv_ptr
is a cv_bridge::CvImagePtr
, and try to do anything with the cv_ptr->image
, the line where I do toCvCopy
segfaults. 其中
cv_ptr
是cv_bridge::CvImagePtr
,并尝试使用cv_ptr->image
做任何事情,这是我执行toCvCopy
segfaults的行。 When I leave the pointer alone and maybe access its contents or something elsewhere in my class, it's seemingly fine... I'm extremely confused. 当我不理会指针并可能访问其内容或班上其他地方的内容时,这似乎还不错……我非常困惑。
Here's some of my real code: 这是我的一些真实代码:
void CNNLocalizer::imageCB(const sensor_msgs::ImageConstPtr &msg)
{
cv_bridge::CvImagePtr cv_ptr;
try
{
cv_ptr = cv_bridge::toCvCopy(msg, sensor_msgs::image_encodings::RGB8);
ROS_INFO("Attempt!");
cv::Mat image = cv_ptr->image.clone();
ROS_INFO("Success!");
image.convertTo(g_most_recent_image_, CV_32FC3);
g_img_height_ = msg->height;
g_img_width_ = msg->width;
g_got_image_ = true;
}
catch (cv_bridge::Exception &e)
{
ROS_ERROR("Failed converting the received message: %s", e.what());
return;
}
}
If I get rid of the business where I try to clone
the cv_ptr->image
, there is no segfault... Any tips or tricks? 如果我
cv_ptr->image
尝试clone
cv_ptr->image
,则不会出现段错误...有任何提示或技巧吗? Am I misunderstanding how things are working here...? 我是不是误解了这里的运作方式...?
Edit: I am running my camera data through a looping rosbag with --clock enabled. 编辑:我正在通过启用--clock的循环rosbag运行我的相机数据。
try debugging that using a try/catch block for "cv_bridge::toCvCopy" 尝试使用try / catch块对“ cv_bridge :: toCvCopy”进行调试
cv_bridge::CvImagePtr cv_ptr;
try
{
cv_ptr = cv_bridge::toCvCopy(msg, sensor_msgs::image_encodings::BGR8);
}
catch (cv_bridge::Exception& e)
{
ROS_ERROR("cv_bridge exception: %s", e.what());
return;
}
and add the exception description when it occurs. 并在发生异常时添加异常描述。
A quick fix would be changing the line : 一个快速的解决方法是更改行:
cv::Mat image = cv_ptr->image.clone();
to : 至 :
cv::Mat image = cv_ptr->image;
This should work just fine. 这应该很好。
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