堆中的错误C＃ [英] Heap error in C#

问题描述

我有一个C＃程序来测试一个C ++ / CLI程序集（这个程序集是一个本机C ++ DLL的包装），并且我收到以下错误消息：

  TestKeyManagerApp.exe中的0x50f8fd85（msvcr90d.dll）中的未处理的异常：0xC0000005：访问冲突写入位置0x00000000。 
  

调试模式中的最后一个位置：dbgheap.c（Visual studio 2008输出）

  if（pHead == NULL）
 {
 * errno_tmp = ENOMEM; < ----- ACCESS VIOLATION 
 RTCCALLBACK（_RTC_FuncCheckSet_hook，（1））; 
} 
  

我创建一个程序集类的对象一次（我的C＃程序的私有成员），在构造函数中，我加载了本机的C ++ dll，现在如果我再次使用汇编对象（第二次调用一个测试函数）我收到了这个错误消息！

调用堆栈：

  msvcr90d.dll！_heap_alloc_dbg_impl（unsigned int nSize = 532，int nBlockUse = 2，const char * szFileName = 0x50ec24a8 ，int nLine = 588，int * errno_tmp = 0x00000000）行431 + 0x3字节C ++ 
 
 msvcr90d.dll！_nh_malloc_dbg_impl（unsigned int nSize = 532，int nhFlag = 0，int nBlockUse = 2，const char * szFileName = 0x50ec24a8，int nLine = 588，int * errno_tmp = 0x00000000）行239 + 0x19字节C ++ 
 
 msvcr90d.dll！_calloc_dbg_impl（unsigned int nNum = 1，unsigned int nSize = 532，int nBlockUse = 2，const char * szFileName = 0x50ec24a8，int nLine = 588，int * errno_tmp = 0x00000000）行593 + 0x20字节C ++ 
 
 msvcr90d.dll！_getptd_noexit（）行588 + 0x1a字节C 
 
 msvcr90d.dll！_errno（）行281 + 0x5字节C 
 
 msvcr90d.dll！_calloc_dbg（unsigned int nNum = 1，unsigned int nSize = 532，int nBlockUse = 2，const char * szFileName = 0x50ec20a4，int nLine = 373）行646 + 0x11 bytes C ++ 
 
 msvcr90d.dll！__ CRTDLL_INIT（void * hDllHandle = 0x50ec0000，unsigned long dwReason = 2，void * lpreserved = 0x00000000）行373 + 0x18 bytes C 
 
 msvcr90d.dll！_CRTDLL_INIT（void * hDllHandle = 0x50ec0000，unsigned long dwReason = 2，void * lpreserved = 0x00000000）行214 + 0x11 bytes C 
 
 ntdll.dll！77c68968（）
 [下面的框可能不正确和/或丢失，没有加载ntdll.dll的符号] 
 ntdll.dll！77c73820（）
 ntdll.dll！77c735bc（）
  

我希望你有提示或提示？ >

Thx！

解决方案

检查调用堆栈，特别是非托管堆栈。为此，您必须启用非托管代码调试。
这可能是伪造的删除或者danging /无效的指针访问。通过最小化本机DLL调用来缩小问题。

I have a C# program to test a C++/CLI assembly (this assembly is a wrapper to a native C++ dll) and I'm getting following error message:

Unhandled exception at 0x50f8fd85 (msvcr90d.dll) in TestKeyManagerApp.exe: 0xC0000005:     Access violation writing location 0x00000000.

last position in debug mode: dbgheap.c (Visual studio 2008 output)

if (pHead == NULL)
{
    *errno_tmp = ENOMEM; <----- ACCESS VIOLATION
    RTCCALLBACK(_RTC_FuncCheckSet_hook,(1));
}

I create an object of the assembly class once (private member of my C# program), in constructor I load the native C++ dll and now if I use the assembly object second time (second call of a testfunction) I got this error messages!

output of Call Stack:

msvcr90d.dll!_heap_alloc_dbg_impl(unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x50ec24a8, int nLine=588, int * errno_tmp=0x00000000)  Line 431 + 0x3 bytes C++

msvcr90d.dll!_nh_malloc_dbg_impl(unsigned int nSize=532, int nhFlag=0, int nBlockUse=2, const char * szFileName=0x50ec24a8, int nLine=588, int * errno_tmp=0x00000000)  Line 239 + 0x19 bytes   C++

msvcr90d.dll!_calloc_dbg_impl(unsigned int nNum=1, unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x50ec24a8, int nLine=588, int * errno_tmp=0x00000000)  Line 593 + 0x20 bytes   C++

msvcr90d.dll!_getptd_noexit()  Line 588 + 0x1a bytes    C

msvcr90d.dll!_errno()  Line 281 + 0x5 bytes C

msvcr90d.dll!_calloc_dbg(unsigned int nNum=1, unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x50ec20a4, int nLine=373)  Line 646 + 0x11 bytes    C++

msvcr90d.dll!__CRTDLL_INIT(void * hDllHandle=0x50ec0000, unsigned long dwReason=2, void * lpreserved=0x00000000)  Line 373 + 0x18 bytes C

msvcr90d.dll!_CRTDLL_INIT(void * hDllHandle=0x50ec0000, unsigned long dwReason=2, void * lpreserved=0x00000000)  Line 214 + 0x11 bytes  C

ntdll.dll!77c68968()    
[Frames below may be incorrect and/or missing, no symbols loaded for ntdll.dll]
ntdll.dll!77c73820()    
ntdll.dll!77c735bc()    

I hope you will have hints or tips for me?

Thx!

解决方案

Check the call stack, specially the unmanaged one. For this you must enable Unmanaged-code Debugging. This is probably bogus delete or danging/invalid pointer access. Narrow down the problem by minimizing the native DLL call.

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