Question

我有一个C＃程序在一段时间后崩溃了。我已经将它跟踪到OpenALPR，现在已经在测试程序中重复了这个问题。

我基本上要求在while循环中从图像中获取印版。经过一堆迭代后失败了。迭代后失败：179,221,516,429,295,150

节目输出：

...
  Iter (219)  No Plates Found in image 71197e9d829d4d429e74a71c983380dc_09032015
134103267.jpg
Config file location provided via API
LBP Time: 0.005ms.
Total Time to process image: 1.916ms.
  Iter (220)  No Plates Found in image 71197e9d829d4d429e74a71c983380dc_09032015
134103267.jpg
Config file location provided via API
LBP Time: 0.003ms.
Total Time to process image: 4.071ms.
  Iter (221)  No Plates Found in image 71197e9d829d4d429e74a71c983380dc_09032015
134103267.jpg
Config file location provided via API

失败消息：

Unhandled Exception:
Unhandled Exception: System.AccessViolationException: Attempted to read or write
 protected memory. This is often an indication that other memory is corrupt.
   at openalprnet.AlprNet.Dispose(Boolean )
System.AccessViolationException: Attempted to read or write protected memory. Th
is is often an indication that other memory is corrupt.
   at alpr.Alpr.{ctor}(Alpr* , basic_string<char\,std::char_traits<char>\,std::a
llocator<char> >* , basic_string<char\,std::char_traits<char>\,std::allocator<ch
ar> >* , basic_string<char\,std::char_traits<char>\,std::allocator<char> >* )
   at openalprnet.AlprNet..ctor(String country, String configFile, String runtim
eDir)
   at AlprTest.Program.Main(String[] args) in C:\Users\foo\Desktop\c#LPR\A
lprTest\Program.cs:line 25

有一次，我还收到了另一条错误消息的一部分（不确定它是否相关）：Unable to load regex: @###@@。虽然上面的错误指向了CTOR，但在我的正常应用中，我在识别呼叫期间失败了。我也看到了（不确定这些堆栈跟踪的准确程度）openalprnet.AlprNet.Dispose(Boolean)从alpr.Alpr.{ctor}(...调用

我的测试程序：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using openalprnet;

namespace AlprTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string chipPath = "71197e9d829d4d429e74a71c983380dc_09032015134103267.jpg";
            string confPath = Path.GetFullPath(".\\openalpr.conf");
            string runtimeDirPath = Path.GetFullPath(".\\runtime_data");
            int i = 0;
            while (true)
            {
                ++i;
                try
                {
                    // Look at target velocity and pick a conf file to use.
                    //
                    AlprNet alpr = new AlprNet("us", confPath, runtimeDirPath);

                    if (!alpr.isLoaded())
                    {
                        return;
                    }
                    // Optionally apply pattern matching for a particular region
                    alpr.DefaultRegion = "va"; // was md
                    alpr.DetectRegion = true;

                    AlprResultsNet results = alpr.recognize(chipPath);

                    if (results.plates.Count < 1)
                    {
                        Console.WriteLine("  Iter ({1})  No Plates Found in image {0}", chipPath, i);
                    }
                    else
                    {
                        int j = 0;
                        foreach (var result in results.plates)
                        {
                            Console.WriteLine("Plate {0}: {1} result(s)", ++j, result.topNPlates.Count);
                            Console.WriteLine("  Processing Time: {0} msec(s)", result.processing_time_ms);
                            foreach (var plate in result.topNPlates)
                            {
                                Console.WriteLine("  - {0}\t Confidence: {1}\tMatches Template: {2}", plate.characters,
                                                    plate.overall_confidence, plate.matches_template);
                            }
                        }
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine("Exception caught in LPR processing.  Ex={0}", ex);
                    return;
                }
            }
        }
    }
}

该程序取决于openalpr发行版和相应的opencv dll。 openalpr-net.dll, liblept170.dll, opencv_core248.dll, opencv_features2d248.dll, opencv_ffmpeg248.dll, opencv_flann248.dll, opencv_highgui248.dll, opencv_imgproc248.dll, opencv_objdetect248.dll, opencv_video248.dll。它还使用了一个runtime_data目录（我只是从示例应用程序中复制而来），它似乎包含训练数据等。

所以，显然，我正在使用C＃。我使用的是Visual Studio 2010和.NET 4.0

我假设我使用OpenALPR是错误的，事实上，它没有任何问题。这似乎是一个非常基本的功能。除了修复它...为什么这会使我的程序崩溃，我怎样才能抓住它并恢复？您注意到我的try-catch完全无法捕获它并且它会使整个应用程序崩溃。

编辑：在运行测试应用程序时，它从2gig的内存开始，但它只是增长，增长和增长。它在147次循环后以7.7 gig坠毁。

编辑编辑：在每次迭代后调用Dispose时添加，现在程序在50-75兆内存中非常稳定。

Answer 1

原来问题是Dispose。

需要Dispose对象。更好的是，不要处理对象并重新使用它。只要配置没有改变，您就可以重用该对象。遗憾的是，prewarp在配置中，因此您可能无法重用该对象。在对象离开范围之前调用Dispose。

            try
            {
                // Look at target velocity and pick a conf file to use.
                //
                AlprNet alpr = new AlprNet("us", confPath, runtimeDirPath);

                if (!alpr.isLoaded())
                {
                    return;
                }
                // Optionally apply pattern matching for a particular region
                alpr.DefaultRegion = "va"; // was md
                alpr.DetectRegion = true;

                AlprResultsNet results = alpr.recognize(chipPath);

                ...

                alpr.Dispose(); // Dispose of the object so it can clean up
            }

OpenALPR崩溃 - 尝试读取或写入受保护的内存

1 个答案: