我有一个C#程序，经过一段可变的时间后一直崩溃。我已将其跟踪到OpenALPR，现在在测试程序中重复了该问题。
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，它失败了。迭代后失败:179、221、516、429、295、150
程序输出:
...
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
失败信息:
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
一次，我还收到了另一条错误消息的一部分(不确定其是否相关):
Unable to load regex: @###@@。尽管上面的错误指向了CTOR，但是在我的普通应用程序中，我还是在识别调用期间失败了。我也已经在openalprnet.AlprNet.Dispose(Boolean)中看到了(不确定这些堆栈跟踪的准确度)，它是从alpr.Alpr.{ctor}(...调用的我的测试程序:
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runtime_data目录(我只是从示例应用程序中复制了该目录)，该目录似乎包含训练数据等。因此，显然，我正在使用C#。我正在使用Visual Studio 2010和.NET 4.0
我假设我使用的是OpenALPR错误，并且实际上没有任何问题。这似乎是一个非常基本的功能。除了修复它之外，为什么这会使我的程序崩溃，又如何捕捉并恢复呢？您会注意到我的try-catch完全无法捕获它，并且崩溃了整个应用程序。
编辑:
在运行测试应用程序时，它以2gig的内存开始，但是随着它的增长而增长。在147个循环后，它以7.7 gig崩溃。
编辑编辑:
在每次迭代后添加对Dispose的调用，现在程序可以稳定地驻留在50-75兆的内存中。
最佳答案
原来的问题是处置。
需要对象的Dispose。更好的是，不要丢弃该对象并重新使用它。只要配置不变，您就可以重用该对象。可悲的是，预扭曲位于配置中，因此您可能无法重用该对象。在对象离开作用域之前调用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
}