error-suppression | 易学教程

Suppress error with @ operator in PHP

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问题 In your opinion, is it ever valid to use the @ operator to suppress an error/warning in PHP whereas you may be handling the error? If so, in what circumstances would you use this? Code examples are welcome. Edit: Note to repliers. I'm not looking to turn error reporting off, but, for example, common practice is to use @fopen($file); and then check afterwards... but you can get rid of the @ by doing if (file_exists($file)) { fopen($file); } else { die('File not found'); } or similar. I guess

How to tell if an error was suppressed by the @ error control operator?

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问题 A 3rd party library I'm using uses the @ error suppression operator in its codes which causes suppressed errors via @ still cause an error output because I am using a custom error handler (set_error_handler()) . In this page it says If you have set a custom error handler function with set_error_handler() then it will still get called, but this custom error handler can (and should) call error_reporting() which will return 0 when the call that triggered the error was preceded by an @. However

Suppressing errors in LoadLibrary

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问题 I'm trying to get rid of the error messages Windows sometimes pops when loading a DLL. I tried to do the following: UINT oldErrorMode = SetErrorMode(SEM_FAILCRITICALERRORS); SetErrorMode(oldErrorMode | SEM_FAILCRITICALERRORS); LoadLibrary(myDll); SetErrorMode(oldErrorMode); But I'm still getting the error windows, I tried to load several DLLs to make sure they don't remove the SerErrorMode() so that's not the case. Does anybody has an idea what else can I try? Thanks 来源： https://stackoverflow

Suppress “WebSocket connection to 'xyz' failed”

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问题 I've written a web application that uses web-sockets. The idea is that my app tries to auto-connect to recently connected to hosts when it starts up. If it can't establish a connection to any of them, then it directs the user to the connection part and asks them to establish a connection manually. All of this works. In summary, I try each known host in order, and if 200ms later it hasn't connected (`readyState != 1), it tries the next one. All these hosts should be on the LAN so 200ms works

Convert raster images to vector graphics using OpenCV?

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问题 I'm looking for a possibility to convert raster images to vector data using OpenCV. There I found a function cv::findContours() which seems to be a bit primitive (more probably I did not understand it fully): It seems to use b/w images only (no greyscale and no coloured images) and does not seem to accept any filtering/error suppresion parameters that could be helpful in noisy images, to avoid very short vector lines or to avoid uneven polylines where one single, straight line would be the

Convert raster images to vector graphics using OpenCV?

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I'm looking for a possibility to convert raster images to vector data using OpenCV. There I found a function cv::findContours() which seems to be a bit primitive (more probably I did not understand it fully): It seems to use b/w images only (no greyscale and no coloured images) and does not seem to accept any filtering/error suppresion parameters that could be helpful in noisy images, to avoid very short vector lines or to avoid uneven polylines where one single, straight line would be the better result. So my question: is there a OpenCV possibility to vectorise coloured raster images where

PHP notice suppression; only certain circumstances/methods

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tl;dr - Is there an effective way to manage the error reporting level of PHP when working in a very strict environment, given certain processes would be made easier with a less strict level? Alright; first off, I don't believe "error suppression" is a solution. I ( am reasonably certain that I ) have never used the @ error suppression operator, and have no intention of doing so. I take advantage of set_error_handler() and ErrorException ( or some derivation of ) and I develop in an error_reporting(-1) ( future proof E_ALL | E_STRICT ) Now, I don't want to change these habits, as I find they

Check Android Permissions in a Method

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here is my code and it works perfectly fine . if (ActivityCompat.checkSelfPermission(activity, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED || ActivityCompat.checkSelfPermission(activity, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) { mMap.setMyLocationEnabled(true); } But I don't like such a big code on every check, and want to delegate it to a method in my utility class. if (Utils.hasMapLocationPermissions(getActivity())) { mMap.setMyLocationEnabled(true); } But setMyLocationEnabled has annotation @RequiresPermission And

How to disable Vim bells sounds?

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问题 I am trying to disable the error bells on vim, both visual and audio. However I cannot get them to stay off. I have the following in my vimrc : " Disable annoying beeping set noerrorbells set vb t_vb= That doesn't work, I figured some plugin or another setting was resetting it so I added it again to the end of my vimrc , still no luck. The only way I can get it to turn off is if I manually call set vb t_vb= after everything has loaded. I guess I could emulate this by adding a script to the

I miss Visual Basic's “On Error Resume Next” in C#. How should I be handing errors now?

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In Visual Basic I wrote just On Error Resume Next in the head of my program and errors were suppressed in the entire project. Here in C# I miss this feature very much. The usual try-catch handling for every single procedure is not only very time-intensive, it brings undesired effects. If an error is encountered, even if handled, the code doesn't continue from the point it occurred. With On Error Resume Next , the code continued from the point of error, skipping just the function call that caused the error. I am not deeply involved with C# yet, but maybe there exists in C# a better error