c# - C# 中的堆错误

Question

我有一个 C# 程序来测试 C++/CLI 程序集(此程序集是 native C++ dll 的包装器)并且我收到以下错误消息:

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

Debug模式下的最后位置:dbgheap.c(Visual studio 2008 输出)

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

我创建了一次程序集类的对象(我的 C# 程序的私有(private)成员)，在构造函数中我加载了 native C++ dll，现在如果我第二次使用程序集对象(第二次调用测试函数)我得到这个错误消息!

调用堆栈的输出:

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()    

我希望你能给我一些提示或技巧？

谢谢!

Answer 1

检查调用堆栈，特别是非托管调用堆栈。为此，您必须启用非托管代码调试。这可能是虚假删除或悬空/无效指针访问。通过最小化 native DLL 调用来缩小问题范围。