ISHELLDISPTACH:为什么folderitemverbs :: Release(） counitializ

IShellDisptach: Why does FolderItemVerbs::Release() + CoUninitialize() crash?

本文关键字：counitializ folderitemverbs 为什么 ISHELLDISPTACH Release      更新时间：2023-10-16

我在 ishellDisPatch com接口方面遇到一个非常奇怪的问题，更具体地说是 folderitemverbs 对象，它使我发疯！

调用 folderitemverbs :: Release（），其次是 couninitialze（）将导致崩溃。这显然是可重复的，但仅发生10次。

崩溃是" 0xc0000005：访问违规"错误。在循环中运行有问题的代码100％迟早会重现崩溃： - （

请参阅示例程序：

static int TestProc(const TCHAR *pcDirectoryName, const TCHAR *pcFileName)
{
    int iSuccess = 0;
    IShellDispatch *pShellDispatch = NULL;
    Folder *pFolder = NULL; FolderItem *pItem = NULL;
    FolderItemVerbs *pVerbs = NULL;
    HRESULT hr = CoCreateInstance(CLSID_Shell, NULL, CLSCTX_INPROC_SERVER, IID_IShellDispatch, (void**)&pShellDispatch);
    if(FAILED(hr) || (pShellDispatch ==  NULL))
    {
        iSuccess = -3;
        return iSuccess;
    }
    variant_t vaDirectory(pcDirectoryName);
    hr = pShellDispatch->NameSpace(vaDirectory, &pFolder);
    if(FAILED(hr) || (pFolder == NULL))
    {
        iSuccess = -4;
        pShellDispatch->Release();
        return iSuccess;
    }
    variant_t vaFileName(pcFileName);
    hr = pFolder->ParseName(vaFileName, &pItem);
    if(FAILED(hr) || (pItem == NULL))
    {
        iSuccess = -5;
        pFolder->Release();
        pShellDispatch->Release();
        return iSuccess;
    }
    hr = pItem->Verbs(&pVerbs);
    if(FAILED(hr) || (pVerbs == NULL))
    {
        iSuccess = -6;
        pItem->Release();
        pFolder->Release();
        pShellDispatch->Release();
        return iSuccess;
    }
    /* Here we would do something with the FolderItemVerbs */
    pVerbs->Release(); pVerbs = NULL; //If this line is commented out, we don't get a crash, but a massive memory leak!
    pItem->Release(); pItem = NULL;
    pFolder->Release(); pFolder = NULL;
    pShellDispatch->Release(); pShellDispatch = NULL;
    iSuccess = 1;
    return iSuccess;
}
//-----------------------------------------------------------------------------
static unsigned __stdcall ThreadProc(void* pArguments)
{
    HRESULT hr = CoInitialize(NULL);
    if((hr == S_OK) || (hr == S_FALSE))
    {
        threadParam_t *params = (threadParam_t*) pArguments;
        params->returnValue = TestProc(params->pcDirectoryName, params->pcFileName);
        CoUninitialize();
    }
    else
    {
        if(threadParam_t *params = (threadParam_t*) pArguments)
        {
            params->returnValue = -10;
        }
    }
    return EXIT_SUCCESS;
}

请下载完整示例代码在这里：http://pastie.org/private/0xsnajpia9lsmgnlf2afa

另外，请注意，我明确地跟踪到崩溃到 folderitemverbs ，因为如果我从不创建 folderitemverbs 对象，崩溃就会立即消失。

另外，如果我从未在 counitialize（）之前称呼" pverbs-> repares（）"，崩溃也消失了，但这显然会导致大量的memleak。

另一个奇怪的事情是，如果我在调试器下运行程序，崩溃将不会发生！但是我可以运行程序，等待崩溃，然后让调试器处理崩溃。

不幸的是，我得到的堆栈跟踪无济于事：http://pastie.org/private/cuwunlun2t5dc5lembpw

我认为我在这里做错了什么。在过去的两天中，我一遍又一遍地检查了代码。因此，这一切似乎都是folderitemverbs中的错误！

有人在以前遇到过这个问题吗？/或可以确认这是文件列表中的错误？另外，是否有解决问题的解决方法？

预先感谢！！！

谢谢大家！

这是执行明确消息的"更正"代码：

void DispatchPendingMessages(void)
{
    const DWORD uiTimeout = GetTickCount() + 10000;
    const HANDLE hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
    unsigned int counter = 0;
    if(hEvent)
    {
        for(;;)
        {
            MSG Message;
            while(PeekMessage(&Message, NULL, WM_NULL, WM_NULL, PM_REMOVE))
            {
                TranslateMessage(&Message);
                DispatchMessage(&Message);
            }
            const DWORD nWaitResult = MsgWaitForMultipleObjects(1, &hEvent, FALSE, 250, QS_ALLINPUT | QS_ALLPOSTMESSAGE);
            if((nWaitResult == WAIT_TIMEOUT) || (nWaitResult == WAIT_FAILED) || (GetTickCount() >= uiTimeout)) break;
        }
        CloseHandle(hEvent);
    }
}
//-----------------------------------------------------------------------------
static int TestProc(const TCHAR *pcDirectoryName, const TCHAR *pcFileName)
{
    int iSuccess = 0;
    IShellDispatch *pShellDispatch = NULL;
    Folder *pFolder = NULL; FolderItem *pItem = NULL;
    FolderItemVerbs *pVerbs = NULL;
    HRESULT hr = CoCreateInstance(CLSID_Shell, NULL, CLSCTX_INPROC_SERVER, IID_IShellDispatch, (void**)&pShellDispatch);
    if(FAILED(hr) || (pShellDispatch ==  NULL))
    {
        iSuccess = -3;
        return iSuccess;
    }
    variant_t vaDirectory(pcDirectoryName);
    hr = pShellDispatch->NameSpace(vaDirectory, &pFolder);
    if(FAILED(hr) || (pFolder == NULL))
    {
        iSuccess = -4;
        pShellDispatch->Release();
        return iSuccess;
    }
    variant_t vaFileName(pcFileName);
    hr = pFolder->ParseName(vaFileName, &pItem);
    if(FAILED(hr) || (pItem == NULL))
    {
        iSuccess = -5;
        pFolder->Release();
        pShellDispatch->Release();
        return iSuccess;
    }
    hr = pItem->Verbs(&pVerbs);
    if(FAILED(hr) || (pVerbs == NULL))
    {
        iSuccess = -6;
        pItem->Release();
        pFolder->Release();
        pShellDispatch->Release();
        return iSuccess;
    }
    /* Here we would do something with the FolderItemVerbs */
    pVerbs->Release(); pVerbs = NULL;
    pItem->Release(); pItem = NULL;
    pFolder->Release(); pFolder = NULL;
    pShellDispatch->Release(); pShellDispatch = NULL;
    iSuccess = 1;
    return iSuccess;
}
//-----------------------------------------------------------------------------
static unsigned __stdcall ThreadProc(void* pArguments)
{
    HRESULT hr = CoInitialize(NULL);
    if((hr == S_OK) || (hr == S_FALSE))
    {
        threadParam_t *params = (threadParam_t*) pArguments;
        params->returnValue = TestProc(params->pcDirectoryName, params->pcFileName);
        DispatchPendingMessages(); //This is required before CoUninitialize() to avoid crash with certain Shell Extensions !!!
        CoUninitialize();
    }
    else
    {
        if(threadParam_t *params = (threadParam_t*) pArguments)
        {
            params->returnValue = -10;
        }
    }
    return EXIT_SUCCESS;
}

到目前为止无法用重现崩溃： - ）

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