c# - 无法使用/clr 选项从 Visual C++ 项目加载 CLR

Question

我正在尝试使用以下配置创建一个 Visual C++ Win32 控制台应用程序:操作系统:Windows 7 Visual Studio :VS 2012公共(public)语言运行时支持:公共(public)语言运行时支持(/clr[项目属性]。

我还创建了一个 Visual C# WPF 应用程序，并使用该 dll 从下面提到的 c++ 程序中使用它。

我遵循此链接中的所有说明:https://code.msdn.microsoft.com/CppHostCLR-e6581ee0

问题是我无法启动 CLR，即 ICLRRunTimeHost:Start 方法返回 0x1 而不是 0x0。请帮助/指导我解决我的错误，如果我的代码在概念上是错误的，请指导我。

请在下面找到我粘贴的代码:

#include "stdafx.h"
#include <metahost.h>
#include <mscoree.h> 
//#include <Windows.h>

//#using <WpfWithoutService.dll>
//using namespace System;
//using namespace System::Threading;

//using namespace WpfWithoutService;

#pragma comment(lib, "mscoree.lib")
/*ref class MainWinClass
{
public:
    void MainForm()
    {
        MainWindow^ mainwin = gcnew MainWindow();
        //mainwin->Activate();
        //mainwin->InitializeComponent();
    }
};*/

int _tmain(int argc, _TCHAR* argv[])
{
    HRESULT hr; 
    //BOOL fLoadable;

    ICLRMetaHost *pMetaHost = NULL;
    LPCWSTR pwzVersion = (LPCWSTR)"v4.0.30319";


    //hr = CLRCreateInstance(CLSID_CLRMetaHost, IID_ICLRMetaHost, (LPVOID*)&pMetaHost); 
    hr = CLRCreateInstance(CLSID_CLRMetaHost, IID_PPV_ARGS(&pMetaHost));
    if (FAILED(hr)) 
    { 
        wprintf(L"CLRCreateInstance failed w/hr 0x%08lx\n", hr); 
    }

    ICLRRuntimeInfo *pRuntimeInfo = NULL; 
// Get the ICLRRuntimeInfo corresponding to a particular CLR version.
    //hr = pMetaHost->GetRuntime(L"v4.0.30319", IID_ICLRRuntimeInfo, (LPVOID *)&pRuntimeInfo); 
    hr = pMetaHost->GetRuntime(L"v4.0.30319", IID_PPV_ARGS(&pRuntimeInfo)); 
    if (FAILED(hr)) 
    { 
        wprintf(L"ICLRMetaHost::GetRuntime failed w/hr 0x%08lx\n", hr); 
        //goto Cleanup; 
    } 


/*Check if the specified runtime can be loaded into the process. This  
// method will take into account other runtimes that may already be  
// loaded into the process and set pbLoadable to TRUE if this runtime can  
// be loaded in an in-process side-by-side fashion.  

    hr = pRuntimeInfo->IsLoadable(&fLoadable); 
    if (FAILED(hr)) 
    { 
        wprintf(L"ICLRRuntimeInfo::IsLoadable failed w/hr 0x%08lx\n", hr); 
        //goto Cleanup; 
    } 


    if (!fLoadable) 
    { 
        wprintf(L".NET runtime %s cannot be loaded\n", "4.0.30319.18063"); 
        //goto Cleanup; 
    }*/


// Load the CLR into the current process and return a runtime interface  pointer. 
    ICLRRuntimeHost *pClrRuntimeHost = NULL;
    hr = pRuntimeInfo->GetInterface(CLSID_CLRRuntimeHost, IID_PPV_ARGS(&pClrRuntimeHost)); 
    if (FAILED(hr)) 
    { 
        wprintf(L"ICLRRuntimeInfo::GetInterface failed w/hr 0x%08lx\n", hr); 
    }


// Start the CLR.
    if (hr == S_OK)
    {
        hr = pClrRuntimeHost->Start(); 
        if (FAILED(hr)) 
        { 
            wprintf(L"CLR failed to start w/hr 0x%08lx\n", hr); 
            //goto Cleanup; 
        }
    }

//Load an assembly and call the required function
    if (hr == S_OK) // if CLR is started successfully
    {
        DWORD dwRet;
        hr = pClrRuntimeHost->ExecuteInDefaultAppDomain(L"WpfWithoutService.dll", L"WpfWithoutService.MainWindow", L"InitializeComponent", NULL, &dwRet); 
        if (FAILED(hr)) 
        { 
            wprintf(L"CLR failed to start w/hr 0x%08lx\n", hr); 
        } 
    }


    if (pMetaHost) 
    { 
        pMetaHost->Release(); 
        pMetaHost = NULL; 
    } 
    if (pRuntimeInfo) 
    { 
        pRuntimeInfo->Release(); 
        pRuntimeInfo = NULL; 
    } 
    if (pClrRuntimeHost) 
    { 
        // Please note that after a call to Stop, the CLR cannot be  
        // reinitialized into the same process. This step is usually not  
        // necessary. You can leave the .NET runtime loaded in your process. 
        //wprintf(L"Stop the .NET runtime\n"); 

            pClrRuntimeHost->Stop()
            pClrRuntimeHost->Release(); 
            pClrRuntimeHost = NULL; 

    } 


    return 0;
}

Answer 1

ICLRRunTimeHost:Start method returns 0x1 instead of 0x0

即 S_FALSE，当 CLR 已经运行时返回。你不能启动它两次。

with following configuration ... Common Language Runtime Support

这是不合适的，它会强制 CLR 在此代码开始运行之前进行加载和初始化。您只能在不使用/clr 构建的 native C++ 程序中编写这样的 CLR 托管代码。

或者换句话说，你根本不需要写这段代码。并且没有明显的理由说明您想要从代码段中获取。从 Assembly::Load() 开始，您可以通过使用反射来实现完全相同的事情。或者更简单，通过添加对该程序集的引用。实际意图很难逆向工程。如果确实存在，则只需将/clr 选项设置回“否”即可。