vc++ 中未处理的异常 - HRESULT 失败

问题描述

我知道 VC++6.0 是很古老的语言，但我别无选择，我只是在维护一个现有的程序，我遇到了这个错误

I know the VC++6.0 is very old language, but i don't have a choice, i am just maintaining an existing program, and i encounter this error

Unhandled exception in Assess.exe (KERNELBASE.DLL): 0xE06D7363: Microsoft C++ Exception

这是我的代码

 HRESULT hr = CoInitialize(NULL);

// Create the interface pointer.
IModulePtr pI(__uuidof(RPTAModuleInterface)); //the error is here

调试和使用f11后，程序转到COMIP.H，代码如下

After debugging and using f11 the program goes to COMIP.H and here is the code

explicit _com_ptr_t(const CLSID& clsid, IUnknown* pOuter = NULL, DWORD dwClsContext = CLSCTX_ALL) throw(_com_error)
    : m_pInterface(NULL)
{
    HRESULT hr = CreateInstance(clsid, pOuter, dwClsContext);
    //the program goes to CreateInstance Method

    if (FAILED(hr) && (hr != E_NOINTERFACE)) {
        _com_issue_error(hr);
        //the program goes here and show the error msg
    }
}

这是CreateInstance

HRESULT CreateInstance(const CLSID& rclsid, IUnknown* pOuter = NULL, DWORD dwClsContext = CLSCTX_ALL) throw()
{
    HRESULT hr;

    _Release();

    if (dwClsContext & (CLSCTX_LOCAL_SERVER | CLSCTX_REMOTE_SERVER)) {
        IUnknown* pIUnknown;

        hr = CoCreateInstance(rclsid, pOuter, dwClsContext, __uuidof(IUnknown), reinterpret_cast<void**>(&pIUnknown));

        if (FAILED(hr)) {
           // the program goes here and return the hr
            return hr;
        }

        hr = OleRun(pIUnknown);

        if (SUCCEEDED(hr)) {
            hr = pIUnknown->QueryInterface(GetIID(), reinterpret_cast<void**>(&m_pInterface));
        }

        pIUnknown->Release();
    }
    else {
        hr = CoCreateInstance(rclsid, pOuter, dwClsContext, GetIID(), reinterpret_cast<void**>(&m_pInterface));
    }

    return hr;
}

我不知道这里的错误是什么，这是头文件，我认为这里没有错误.知道如何解决这个问题吗?

I don't know what's the error here, this is header file and i think there's no error here. Any Idea how to fix this thing?

更新

在我的 RPTAInterface.tlh 中，我看到了 RPTAModuleInterface

in my RPTAInterface.tlh i saw the declaration of RPTAModuleInterface

struct /* coclass */ RPTAModuleInterface;

struct __declspec(uuid("d6134a6a-a08e-36ab-a4c0-c03c35aad201"))
RPTAModuleInterface;

推荐答案

_com_issue_error() 抛出您没有捕捉到的 _com_error 异常.您需要将代码包装在 try/catch 中，例如:

_com_issue_error() throws a _com_error exception that you are not catching. You need to wrap your code in a try/catch, eg:

try
{
    IModulePtr pI(__uuidof(RPTAModuleInterface));
    // ...
}
catch(const _com_error& e)
{
    // e.Error() will return the HRESULT value
    // ...
}

显然 CoCreateInstance() 失败了.机器上可能没有安装为 RPTAModuleInterface 注册 CoClass 的库，因此无法创建它.但是您必须查看实际的 HRESULT 才能确定 CoCreateInstance() 失败的原因.

Clearly CoCreateInstance() is failing. There is likely no library installed on the machine that registers the CoClass for RPTAModuleInterface, so it cannot be created. But you will have to look at the actual HRESULT to be sure why CoCreateInstance() is failing.

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