堆栈内存溢出
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从C＃调用非托管C ++库（dll）会产生访问冲突错误（0xc0000005）

[英]Calling unmanaged C++ library (dll) from C# creates an access violation error (0xc0000005)

 原文  2011-06-23 13:08:31  0   2    c#/ .net/ c++/ interop/ pinvoke

问题描述

Sorry for the long question. 很抱歉这个问题很长。 I just wanted to include everything that I know about the problem at the moment. 我只是想包括我目前对这个问题所知的一切。

I'm using Visual Studio 2008 to create a Windows Form program in C# that calls a library written in C++. 我正在使用Visual Studio 2008在C＃中创建一个Windows Form程序，该程序调用用C ++编写的库。
The C++ DLL analyzes measurement data, which consists of several samples. C ++ DLL分析测量数据，该数据由几个样本组成。 The samples are passed to the library by a function ( PDSetWaveSample ) which takes a struct as a parameter. 样本通过函数（ PDSetWaveSample ）传递给库，该函数将结构作为参数。
After all samples are set, the measurement data is processed with another function ( PDPreProcess ) which also takes a struct as a parameter. 在设置所有样本之后，使用另一个函数（ PDPreProcess ）处理测量数据，该函数还将结构作为参数。
The C++ DLL is holding all the measurement data in its internal data structures and does all the processing to obtain results. C ++ DLL将所有测量数据保存在其内部数据结构中，并进行所有处理以获得结果。

Everything seems to function correctly until the program starts processing the measurement data. 在程序开始处理测量数据之前，一切似乎都能正常运行。 At that point the program crashes and exits with this error: 此时程序崩溃并退出此错误：

The program 'XXX.vshost.exe: Managed' has exited with code -1073741819 (0xc0000005). 程序'XXX.vshost.exe：Managed'已退出，代码为-1073741819（0xc0000005）。

I'll add some more debugging information and the C# source code later in this question. 我将在本问题的后面添加一些调试信息和C＃源代码。

Do you have any hints how to go forward or what probably could cause this? 您是否有任何提示如何前进或可能导致这种情况？

I am running Windows XP Professional, Version 2002 SP 3. 我正在运行Windows XP Professional，版本2002 SP 3。

When the program crashes, it first gives this error message 当程序崩溃时，它首先给出此错误消息

An unhandled exception of type 'System.ExecutionEngineException' occurred in Unknown Module. 未知模块中出现未处理的“System.ExecutionEngineException”类型异常。

and the possibility to Break or Continue. 以及打破或继续的可能性。 I choose to Break. 我选择休息。

After that I look at the assembly: 之后我看看大会：

No symbols are loaded for any call stack frame. 没有为任何调用堆栈帧加载符号。 The source code cannot be displayed. 源代码无法显示。

According to the debugger, the assembly at the point where the error happens looks like this: 根据调试器，发生错误的位置的程序集如下所示： 

7C90E4FA  call        7C90E528 
7C90E4FF  mov         eax,dword ptr [esp] 
7C90E502  mov         esp,ebp 
7C90E504  pop         ebp  
7C90E505  ret              
7C90E506  lea         esp,[esp] 
7C90E50D  lea         ecx,[ecx] 
7C90E510  mov         edx,esp 
7C90E512  sysenter         
==>7C90E514  ret              
7C90E515  lea         esp,[esp] 
7C90E51C  lea         esp,[esp] 
7C90E520  lea         edx,[esp+8] 
7C90E524  int         2Eh  
7C90E526  ret              
7C90E527  nop              
7C90E528  push        ebp  
7C90E529  mov         ebp,esp 
7C90E52B  pushfd

The execution stops at 7C90E514 ret (which I marked with ==>) 执行在7C90E514 ret处停止（我用==>标记）

The output window shows the following messages: 输出窗口显示以下消息： 

'CalculationForm.exe': Loaded 'C:\CalculationForm\CalculationForm\bin\Debug\CalculationForm.exe', No native symbols in symbol file.  
'CalculationForm.exe': Loaded 'C:\WINNT\system32\ntdll.dll'  
'CalculationForm.exe': Loaded 'C:\WINNT\system32\kernel32.dll'  
'CalculationForm.exe': Loaded 'C:\WINNT\system32\sysfer.dll'  
'CalculationForm.exe': Loaded 'C:\WINNT\system32\mscoree.dll'  
'CalculationForm.exe': Loaded 'C:\WINNT\system32\advapi32.dll'  
'CalculationForm.exe': Loaded 'C:\WINNT\system32\rpcrt4.dll'  
'CalculationForm.exe': Loaded 'C:\WINNT\system32\secur32.dll'  
'CalculationForm.exe': Loaded 'C:\WINNT\system32\shlwapi.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\gdi32.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\user32.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\msvcrt.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\imm32.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\Microsoft.NET\Framework\v2.0.50727\mscorwks.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\WinSxS\x86_Microsoft.VC80.CRT_1fc8b3b9a1e18e3b_8.0.50727.4053_x-ww_e6967989\msvcr80.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\shell32.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\WinSxS\x86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.2600.6028_x-ww_61e65202\comctl32.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\comctl32.dll'
'CalculationForm.exe': Loaded 'C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Culture.dll' 
'CalculationForm.exe': Unloaded 'C:\WINNT\Microsoft.NET\Framework\v2.0.50727\Culture.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\assembly\NativeImages_v2.0.50727_32\mscorlib\17179b71d7680399c00ce88ddc310209\mscorlib.ni.dll' 
'CalculationForm.exe' (Managed): Loaded 'C:\WINNT\assembly\GAC_32\mscorlib\2.0.0.0__b77a5c561934e089\mscorlib.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\ole32.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\MSCTF.dll' 
'CalculationForm.exe' (Managed): Loaded 'C:\Tyohakemisto\WaveRoller\CalculationForm\CalculationForm\bin\Debug\CalculationForm.exe', Symbols loaded. 
'CalculationForm.exe': Loaded 'C:\WINNT\Microsoft.NET\Framework\v2.0.50727\mscorjit.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\assembly\NativeImages_v2.0.50727_32\System\2f867d97fb1a34e4d6985780631574bb\System.ni.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\assembly\NativeImages_v2.0.50727_32\System.Drawing\f78f03ba3b1b21e3b26369402c117d33\System.Drawing.ni.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\assembly\NativeImages_v2.0.50727_32\System.Windows.Forms\06b728c1e4ea291d4febee5ca33db4b4\System.Windows.Forms.ni.dll' 
'CalculationForm.exe' (Managed): Loaded 'C:\WINNT\assembly\GAC_MSIL\System.Windows.Forms\2.0.0.0__b77a5c561934e089\System.Windows.Forms.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'CalculationForm.exe' (Managed): Loaded 'C:\WINNT\assembly\GAC_MSIL\System\2.0.0.0__b77a5c561934e089\System.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'CalculationForm.exe' (Managed): Loaded 'C:\WINNT\assembly\GAC_MSIL\System.Drawing\2.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'CalculationForm.exe': Loaded 'C:\WINNT\assembly\NativeImages_v2.0.50727_32\System.Configuration\b2f3e4c45a980474c2dd08166038d645\System.Configuration.ni.dll' 
'CalculationForm.exe' (Managed): Loaded 'C:\WINNT\assembly\GAC_MSIL\System.Configuration\2.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'CalculationForm.exe': Loaded 'C:\WINNT\assembly\NativeImages_v2.0.50727_32\System.Xml\8ee82dfeff03ca87492149cdcbfc3f21\System.Xml.ni.dll' 
'CalculationForm.exe' (Managed): Loaded 'C:\WINNT\assembly\GAC_MSIL\System.Xml\2.0.0.0__b77a5c561934e089\System.Xml.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'CalculationForm.exe': Loaded 'ImageAtBase0x10000000'
'CalculationForm.exe': Unloaded 'ImageAtBase0x10000000' 
'CalculationForm.exe': Loaded 'C:\WINNT\assembly\GAC_MSIL\Microsoft.VisualStudio.Debugger.Runtime\9.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.Debugger.Runtime.dll' 
'CalculationForm.exe' (Managed): Loaded 'C:\WINNT\assembly\GAC_MSIL\Microsoft.VisualStudio.Debugger.Runtime\9.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.Debugger.Runtime.dll' 
'CalculationForm.exe': Loaded 'C:\Program Files\Microsoft Visual Studio 9.0\Common7\Packages\Debugger\x86\Microsoft.VisualStudio.Debugger.Runtime.Impl.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\WinSxS\x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.30729.4148_x-ww_d495ac4e\msvcr90.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\uxtheme.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\xpsp2res.dll', Binary was not built with debug information. 
'CalculationForm.exe' (Managed): Loaded 'C:\CalculationForm\CalculationForm\bin\Debug\AxInterop.PDCOMMXLib.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\WinSxS\x86_Microsoft.Windows.GdiPlus_6595b64144ccf1df_1.0.6002.22509_x-ww_c7dad023\GdiPlus.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\version.dll' 
'CalculationForm.exe': Unloaded 'C:\WINNT\system32\version.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\MSCTFIME.IME' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\oleaut32.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\Microsoft.NET\Framework\v2.0.50727\diasymreader.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\clbcatq.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\comres.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\version.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\msi.dll' 
'CalculationForm.exe': Loaded 'C:\Nortek\PdCommX\PdCommX.dll', Binary was not built with debug information. 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\mfc100.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\msvcr100.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\msimg32.dll'
'CalculationForm.exe': Loaded 'C:\WINNT\system32\msvcp100.dll' 
'CalculationForm.exe': Loaded 'C:\WINNT\system32\sxs.dll' 
'CalculationForm.exe' (Managed): Loaded 'C:\ CalculationForm\CalculationForm\bin\Debug\Interop.PDCOMMXLib.dll'
'CalculationForm.exe': Loaded 'C:\WINNT\assembly\NativeImages_v2.0.50727_32\Accessibility\775f9f0da40c277eb7d460084858a2ac\Accessibility.ni.dll'
'CalculationForm.exe' (Managed): Loaded 'C:\WINNT\assembly\GAC_MSIL\Accessibility\2.0.0.0__b03f5f7f11d50a3a\Accessibility.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
The thread 'Win32 Thread' (0x1f08) has exited with code 0 (0x0).
The thread 'Win32 Thread' (0x1cc4) has exited with code 0 (0x0).
The thread 'Win32 Thread' (0x1598) has exited with code 0 (0x0).
The thread 'Win32 Thread' (0xaa8) has exited with code 0 (0x0). 
The thread 'Win32 Thread' (0x1db8) has exited with code 0 (0x0).
The thread 'Win32 Thread' (0x1e74) has exited with code 0 (0x0).
The thread 'Win32 Thread' (0x1958) has exited with code 0 (0x0).
The program '[4656] CalculationForm.exe: Managed' has exited with code 0 (0x0).
The program '[4656] CalculationForm.exe: Native' has exited with code 0 (0x0).

When program ends, the call stack is: 程序结束时，调用堆栈是： 

ntdll.dll!7c90e514()    
[Frames below may be incorrect and/or missing, no symbols loaded for ntdll.dll] 
ntdll.dll!7c90df5a()    
kernel32.dll!7c8025db()     
mscorwks.dll!79e8c639()     
mscorwks.dll!79e8c56f()     
mscorwks.dll!79f7466d()     
mscorwks.dll!7a105cf1()     
mscorwks.dll!7a105e37()     
mscorwks.dll!7a1061db()     
mscorwks.dll!7a09c314()     
mscorwks.dll!79f504da()     
mscorwks.dll!79ef4755()     
ntdll.dll!7c9032a8()    
ntdll.dll!7c90327a()    
ntdll.dll!7c92a8c3()    
ntdll.dll!7c90e48a()    
ntdll.dll!7c94b721()    
ntdll.dll!7c919f68()    
ntdll.dll!7c919f68()    
ntdll.dll!7c919f68()    
ntdll.dll!7c919f68()    
ntdll.dll!7c910385()    
ntdll.dll!7c917c51()    
ntdll.dll!7c917e8f()    
mscorwks.dll!79e71b4c()     
mscorwks.dll!79e821f9()     
mscorwks.dll!79e96571()     
mscorwks.dll!79e965a4()     
mscorwks.dll!79e965c2()     
mscorwks.dll!79ecca87()     
mscorwks.dll!79ef531b()     
mscorwks.dll!79ef6dd8()     
mscorwks.dll!79ef6e76()     
mscorwks.dll!79ef4755()     
ntdll.dll!7c9032a8()    
ntdll.dll!7c90327a()    
ntdll.dll!7c92a8c3()    
ntdll.dll!7c90e48a()    
ntdll.dll!7c917ca7()    
ntdll.dll!7c917e8f()    
mscorwks.dll!7a0ecb29()     
mscorwks.dll!79f6879a()     
mscorwks.dll!79f68780()     
mscorwks.dll!79f73f3d()     
mscorwks.dll!79ecd659()     
mscorwks.dll!79e71b4c()     
mscorwks.dll!79e821f9()     
mscorwks.dll!79e96571()     
mscorwks.dll!79e965a4()     
mscorwks.dll!79e965c2()     
mscorwks.dll!79f87ad3()     
mscorwks.dll!79f87c32()     
mscorlib.ni.dll!792d5428()  
mscorlib.ni.dll!792d51d6()  
mscorlib.ni.dll!792d50be()  
mscorwks.dll!79e71b4c()     
mscorwks.dll!79e821f9()     
mscorwks.dll!79e96571()     
mscorwks.dll!79e965a4()     
mscorwks.dll!79f29e09()     
mscorwks.dll!79f2a1e0()     
mscorwks.dll!79f2a130()     
mscorwks.dll!79f29837()     
mscorwks.dll!79f298bc()     
mscorwks.dll!79f29967()     
System.ni.dll!7a574b73()    
System.Windows.Forms.ni.dll!7b1c87be()  
mscorwks.dll!79e71b4c()     
mscorwks.dll!79e821f9()     
System.Windows.Forms.ni.dll!7b1c86a0()  
System.Windows.Forms.ni.dll!7b1c8621()  
System.Windows.Forms.ni.dll!7b6fa167()  
mscorwks.dll!79e71b4c()     
mscorwks.dll!79e821f9()     
mscorwks.dll!79fc1fe2()     
mscorwks.dll!79fc219a()     
mscorwks.dll!79fc22be()     
mscorwks.dll!79f077ad()     
mscorwks.dll!79e8c4ec()     
mscorwks.dll!79e8840b()     
mscorwks.dll!79f13cb5()     
mscorwks.dll!79f1129c()     
mscorwks.dll!79f07e17()     
mscoree.dll!7900b77b()  
mscoree.dll!7900b73d()  
mscoree.dll!79004de3()  
kernel32.dll!7c817077()

I have created a wrapper class for the C++ DLL. 我已经为C ++ DLL创建了一个包装类。 The wrapper class is based on the header file for the library: 包装类基于库的头文件： 

#ifndef _PDWAVEAPI_H__  
#define _PDWAVEAPI_H__

#ifdef PDWAVE_EXPORTS
#define PDWAVE_API __declspec(dllexport)
#else
#define PDWAVE_API __declspec(dllimport)
#endif

typedef struct {
   bool  bValid;
   float fPressure;
   float fDistance;
   float fVel[4];
   unsigned short nAmp[4];
 } PDWaveSample;

typedef struct {
    float fST[4096];
    float fWinFloor;
    float fWinCeil;
    bool bUseWindow;
    bool bSTOk;
    bool bGetRawAST;
    bool bValidBurst;
 } PDWaveBurst;


PDWAVE_API int __stdcall PDSetWaveSample(PDWaveSample *pWaveSample);
PDWAVE_API int __stdcall PDPreProcess(int nSample, PDWaveBurst *pWaveBurst);

and the C# wrapper class is: 而C＃包装类是： 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices; // DllImport

namespace Cpp_LibraryApi
{
    [StructLayout(LayoutKind.Sequential)]
    public struct PDWaveSample
    {
        public bool bValid;                             
        public float fPressure;                         
        public float fDistance;                         
        public float[] fVel;
        public ushort[] nAmp

        // Constructor to initialize tables

        public static PDWaveSample Create()
        {
            PDWaveSample DataStruct = new PDWaveSample();
            DataStruct.fVel = new float[4];
            DataStruct.nAmp = new ushort[4];
            return DataStruct;
        }
    }
    [StructLayout(LayoutKind.Sequential)]
    public  struct PDWaveBurst {
        public float[] fST;
        public float fWinFloor;
        public float fWinCeil;
        public bool bUseWindow;
        public bool bSTOk;
        public bool bGetRawAST;
        public bool bValidBurst;

        public static PDWaveBurst Create()
        {
            PDWaveBurst DataStruct = new PDWaveBurst();
            DataStruct.fST = new float[Constants.PD_MAX_WAVEMEAS_AST];
            return DataStruct;
        }
    }

    public class Cpp_LibraryWrapper
    {
        [DllImport("cpp_library.dll")]
        public static extern int PDSetWaveSample(ref PDWaveSample pWaveSample);

        [DllImport("cpp_library.dll")]
        public static extern int PDPreProcess(int nSample, ref PDWaveBurst pWaveBurst);

    }
}

The Windows Forms application is using these functions in the following way: Windows窗体应用程序以下列方式使用这些功能：

I have simplified the function a little bit. 我已经简化了一点功能。 Actually the measurements are read from a serial line using a third party ActiveX component. 实际上，使用第三方ActiveX组件从串行线读取测量值。 

using System;
using System.Configuration;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using System.Timers;
using System.Diagnostics;

namespace CalculationForm
{
    public partial class frmCalculationForm : Form
    {
        int nBurstSamples = 0;

        public frmCalculationForm()
        {
            InitializeComponent();
        }

        private void OnNewData_Event(object sender, Events_OnNewDataEvent e)
        {
            try
            {
                Cpp_LibraryApi.PDWaveSample WaveSampleData = Cpp_LibraryApi.PDWaveSample.Create();

                ReadWaveSample(ref WaveSampleData);
                SetWaveSample(WaveSampleData);

                if (++nBurstSamples > 512)
                {
                    // Process
                    ProcessBurstData(nBurstSamples);
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex.Message.ToString());
            }
        }

        public void ReadWaveSample(ref Cpp_LibraryApi.PDWaveSample WaveSampleData)
        {
            float[] dVel = new float[4] { (float)-3.26, (float)-2.808, (float)-3.651, (float)-3.43 };
            ushort[] usAmp = new ushort[4] { 41, 40, 0, 0 };
            WaveSampleData.bValid = true;
            WaveSampleData.fPressure = 12.432;
            WaveSampleData.fDistance = 2.64;
            WaveSampleData.fVel = dVel;
            WaveSampleData.nAmp = usAmp;
        }

        public void SetWaveSample(Cpp_LibraryApi.PDWaveSample WaveSampleData)
        {
            Cpp_LibraryWrapper.PDSetWaveSample(ref WaveSampleData);
        }

        public void ProcessBurstData(int nSamples)
        {
            try
            {
                Cpp_LibraryApi.PDWaveBurst WaveBurstData = Cpp_LibraryApi.PDWaveBurst.Create();

                WaveBurstData.fST = new float[4096];
                WaveBurstData.fWinFloor = (float)1.25;
                WaveBurstData.fWinCeil = 2;
                WaveBurstData.bUseWindow = false;
                WaveBurstData.bSTOk = false;
                WaveBurstData.bGetRawAST = false;
                WaveBurstData.bValidBurst = false;

                Cpp_LibraryWrapper.PDPreProcess(nSamples, ref WaveBurstData);
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex.Message.ToString());
            }
        }
    }
}

Everything seems to go well until the program reaches the measurement processing phase. 在程序到达测量处理阶段之前，一切似乎都很顺利。 When 什么时候 

Cpp_LibraryWrapper.PDPreProcess(nSamples, ref WaveBurstData);

is called, the execution stops with this error: 被调用，执行因此错误而停止：

The program 'XXX.vshost.exe: Managed' has exited with code -1073741819 (0xc0000005). 程序'XXX.vshost.exe：Managed'已退出，代码为-1073741819（0xc0000005）。

I have set these debugging options: 我已经设置了这些调试选项：

  • Enable unmanaged code debugging 启用非托管代码调试
  • Enable the Visual Studio hosting process 启用Visual Studio托管过程
  • Common Language Runtime Exceptions “Thrown” 公共语言运行时异常“抛出”
  • Win32 Exceptions -> Access violation “Thrown” Win32异常 - >访问冲突“抛出”

2 个解决方案

解决方案1
 6 已采纳  2011-06-23 13:25:58

Your structs are marshalled incorrectly because you didn't declare the arrays quite right. 您的结构被错误地编组，因为您没有正确地声明数组。 You need to tell the marshaller that they are fixed length arrays. 您需要告诉编组器它们是固定长度的数组。

EDIT 编辑

In my original answer I missed the addition error that the bool members were not marshalled correctly. 在我原来的答案中，我错过了bool成员没有正确编组的附加错误。 The default marshalling is for the 4 byte Windows BOOL but you need 1 byte C++ bool . 默认编组是针对4字节的Windows BOOL但您需要1个字节的C ++ bool 。 The code below now handles that correctly. 下面的代码现在可以正确处理。 Sorry for the confusion. 对困惑感到抱歉。 

public struct PDWaveSample
{
    [MarshalAs(UnmanagedType.I1)]
    public bool bValid;                             
    public float fPressure;                         
    public float fDistance;                         
    [MarshalAs(UnmanagedType.LPArray, SizeConst=4)]
    public float[] fVel;
    [MarshalAs(UnmanagedType.LPArray, SizeConst=4)]
    public ushort[] nAmp
}

public struct PDWaveBurst {
    [MarshalAs(UnmanagedType.LPArray, SizeConst=4096)]
    public float[] fST;
    public float fWinFloor;
    public float fWinCeil;
    [MarshalAs(UnmanagedType.I1)]
    public bool bUseWindow;
    [MarshalAs(UnmanagedType.I1)]
    public bool bSTOk;
    [MarshalAs(UnmanagedType.I1)]
    public bool bGetRawAST;
    [MarshalAs(UnmanagedType.I1)]
    public bool bValidBurst;
}

解决方案2
 1  2011-07-01 06:41:26

Actually, I had to marshall the arrays as ByValArray. 实际上，我不得不将数组编组为ByValArray。 Otherwise the running environment had something to complain about: 否则，运行环境有一些抱怨：

"A first chance exception of type 'System.TypeLoadException' occurred in CalculationForm.exe “在CalculationForm.exe中发生了'System.TypeLoadException'类型的第一次机会异常

Additional information: Cannot marshal field 'fVel' of type 'PdWaveApi.PDWaveSample': Invalid managed/unmanaged type combination (Arrays fields must be paired with ByValArray or SafeArray)." 附加信息：无法封送'PdWaveApi.PDWaveSample'类型的字段'fVel'：无效的托管/非托管类型组合（数组字段必须与ByValArray或SafeArray配对）。“

So, I changed the struct to this: 所以，我将结构更改为： 

public struct PDWaveSample
{
    [MarshalAs(UnmanagedType.I1)]
    public bool bValid;                             
    public float fPressure;                         
    public float fDistance;                         
    [MarshalAs(UnmanagedType.ByValArray, SizeConst=4)]
    public float[] fVel;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst=4)]
    public ushort[] nAmp
}

public struct PDWaveBurst {
    [MarshalAs(UnmanagedType.ByValArray, SizeConst=4096)]
    public float[] fST;
    public float fWinFloor;
    public float fWinCeil;
    [MarshalAs(UnmanagedType.I1)]
    public bool bUseWindow;
    [MarshalAs(UnmanagedType.I1)]
    public bool bSTOk;
    [MarshalAs(UnmanagedType.I1)]
    public bool bGetRawAST;
    [MarshalAs(UnmanagedType.I1)]
    public bool bValidBurst;
}

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