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c++ - Microsoft C++ 异常：来自 DLL 的函数中内存位置的 std::bad_array_new_length

问题描述

我使用 Visual Studio 2019。我编写了两个测试项目：exe 和 dll。我的 dll 包括 noexported 类和导出函数：

#pragma once

#include <vector>

#ifdef DLL_EXPORT
#define DLL __declspec(dllexport)
#else
#define DLL __declspec(dllimport)
#endif


struct dll
{
public:
    std::vector<int> a;
    std::vector<int> b;
    std::vector<int> c;
    int d;

};
extern "C" DLL dll * _data1();

及实现功能：

#include "dll.h"

dll* _data1()
{
    dll* a = new dll;
    return a;
}

然后，我的 exe 包括 main.cpp，它调用函数_data1()：

#include "../Dll1/dll.h"
#include <windows.h>

#pragma comment(lib, "../Project1/Debug/Dll1.lib")

int APIENTRY WinMain(HINSTANCE hInst, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int    nCmdShow)
{
    dll* b = _data1();
    b->a.push_back(1);

    return 0;
}

此代码在线损坏b->a.push_back(1);。我调试了我的代码，并了解到函数 _data1() 返回正确的值，但函数WinMain值已经损坏。此外，在我的 exe 中为运行时库设置标志 /MD 并删除预处理器定义 _DEBUG。这是一个强制性条件。

在我的 DLL 中，我定义了 DLL_EXPORT。

当前配置：调试 Win32

为什么会发生这种情况？

UPD1：

XML 配置。可执行程序：

<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <ItemGroup Label="ProjectConfigurations">
    <ProjectConfiguration Include="Debug|Win32">
      <Configuration>Debug</Configuration>
      <Platform>Win32</Platform>
    </ProjectConfiguration>
  </ItemGroup>
  <ItemGroup>
    <ClCompile Include="main.cpp" />
  </ItemGroup>
  <PropertyGroup Label="Globals">
    <VCProjectVersion>16.0</VCProjectVersion>
    <Keyword>Win32Proj</Keyword>
    <ProjectGuid>{bc6cc284-56fc-4b4a-8d42-9d15887c7155}</ProjectGuid>
    <RootNamespace>ConsoleApplication5</RootNamespace>
    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
    <ProjectName>TestApp</ProjectName>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>true</UseDebugLibraries>
    <PlatformToolset>v142</PlatformToolset>
    <CharacterSet>Unicode</CharacterSet>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
  <ImportGroup Label="ExtensionSettings">
  </ImportGroup>
  <ImportGroup Label="Shared">
  </ImportGroup>
  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
  </ImportGroup>
  <PropertyGroup Label="UserMacros" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <LinkIncremental>true</LinkIncremental>
  </PropertyGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <ClCompile>
      <WarningLevel>Level3</WarningLevel>
      <SDLCheck>true</SDLCheck>
      <PreprocessorDefinitions>WIN32;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <ConformanceMode>true</ConformanceMode>
      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
      <FloatingPointModel>Fast</FloatingPointModel>
      <RuntimeTypeInfo>true</RuntimeTypeInfo>
    </ClCompile>
    <Link>
      <SubSystem>Windows</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
    </Link>
  </ItemDefinitionGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
  <ImportGroup Label="ExtensionTargets">
  </ImportGroup>
</Project>

dll：

<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <ItemGroup Label="ProjectConfigurations">
    <ProjectConfiguration Include="Debug|Win32">
      <Configuration>Debug</Configuration>
      <Platform>Win32</Platform>
    </ProjectConfiguration>
  </ItemGroup>
  <ItemGroup>
    <ClInclude Include="dll.h" />
  </ItemGroup>
  <ItemGroup>
    <ClCompile Include="dll.cpp" />
  </ItemGroup>
  <PropertyGroup Label="Globals">
    <VCProjectVersion>16.0</VCProjectVersion>
    <Keyword>Win32Proj</Keyword>
    <ProjectGuid>{328cdf3e-630e-46c0-9be9-9b838a13873f}</ProjectGuid>
    <RootNamespace>Dll1</RootNamespace>
    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
    <ProjectName>Dll</ProjectName>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
    <ConfigurationType>DynamicLibrary</ConfigurationType>
    <UseDebugLibraries>true</UseDebugLibraries>
    <PlatformToolset>v142</PlatformToolset>
    <CharacterSet>Unicode</CharacterSet>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
  <ImportGroup Label="ExtensionSettings">
  </ImportGroup>
  <ImportGroup Label="Shared">
  </ImportGroup>
  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
  </ImportGroup>
  <PropertyGroup Label="UserMacros" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <LinkIncremental>true</LinkIncremental>
  </PropertyGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <ClCompile>
      <WarningLevel>Level3</WarningLevel>
      <SDLCheck>true</SDLCheck>
      <PreprocessorDefinitions>DLL_EXPORT;WIN32;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <ConformanceMode>true</ConformanceMode>
      <PrecompiledHeader>NotUsing</PrecompiledHeader>
      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
    </ClCompile>
    <Link>
      <SubSystem>Windows</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
      <EnableUAC>false</EnableUAC>
    </Link>
  </ItemDefinitionGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
  <ImportGroup Label="ExtensionTargets">
  </ImportGroup>
</Project>

标签： c++visual-studiodll

解决方案

问题在于所使用的运行时库之间的差异：DLL 使用调试 DLL 运行时 (/MTd)，而应用程序使用发布 EXE 运行时 (/MD)。您应该将应用程序切换到调试 (/MTd)。内存管理仅适用于一致的库。

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