C++ 从纯C中访问通用项对话框

这是我第一次try 任何形式的COM.我正在try 以文件夹模式启动打开文件对话框.代码编译了，但应用程序无法启动，并且我得到了一个"Ordinal‘t Locate in the Dynamic Link Library"错误.有谁能找出可能导致这种情况的原因吗？任何帮助都将不胜感激.注意:代码基于我对MSDN示例和文档的解释.现在我知道它什么都做不了，我只是想让它显示对话框.

谢谢!

HRESULT OpenDirectory()
{
    //Initialize the COM library
    COINIT Init = COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE;
    CoInitialize(NULL);

    //CoCreate Folder Open Dialog Object
    IFileDialog *pfd = NULL;
    CLSID OpenFileID = CLSID_FileOpenDialog;
    IID IFileDialog = IID_IFileDialog;
    HRESULT hr = CoCreateInstance(&OpenFileID, NULL, CLSCTX_INPROC_SERVER, &IFileDialog, (void**) ( &pfd));
    


    if (SUCCEEDED(hr))
    {
        IFileDialogEvents *pfde = NULL;
        hr = OpenDirEventHandler(&pfde);

        if (SUCCEEDED(hr))
        {
            //Hook the Event Handler
            DWORD dwHook;
            hr = pfd->lpVtbl->Advise(pfd, pfde, &dwHook);


            if (SUCCEEDED(hr))
            {
                //flags
                DWORD dwFlags;
                hr = pfd->lpVtbl->GetOptions(pfd, &dwFlags);

                if (SUCCEEDED(hr))
                {
                    hr = pfd->lpVtbl->SetOptions(pfd, dwFlags | FOS_FORCEFILESYSTEM | FOS_PICKFOLDERS);

                    if (SUCCEEDED(hr))
                    {
                        hr = pfd->lpVtbl->Show(pfd, NULL);

                        if (SUCCEEDED(hr))
                        {
                            IShellItem *psiResult;
                            
                            hr = pfd->lpVtbl->GetResult(pfd, &psiResult);

                            // We are just going to print out the 
                                          // name of the file for sample sake.
                            PWSTR pszFilePath = NULL;
                            hr = psiResult->lpVtbl->GetDisplayName(pfd, SIGDN_FILESYSPATH,
                                &pszFilePath);
                            
                            if (SUCCEEDED(hr))
                            {
                                TaskDialog(NULL,
                                    NULL,
                                    L"CommonFileDialogApp",
                                    pszFilePath,
                                    NULL,
                                    TDCBF_OK_BUTTON,
                                    TD_INFORMATION_ICON,
                                    NULL);
                                CoTaskMemFree(pszFilePath);
                            }
                            psiResult->lpVtbl->Release(psiResult);
                        }
                    }
                }

            }
            pfd->lpVtbl->Unadvise(pfd, dwHook);
        }
        pfde->lpVtbl->Release(pfde);
    }
    pfd->lpVtbl->Release(pfd);


    return 0;
}


HRESULT STDMETHODCALLTYPE FileOK(IFileDialog *pfd)
{
    return 0;
}

HRESULT STDMETHODCALLTYPE SelectionChange(IFileDialog *pfd)
{
    return 0;
}

HRESULT STDMETHODCALLTYPE DirOverwrite(IFileDialog *pfd)
{
    return 0;
}

 OpenDirEventHandler(IFileDialogEvents *pfde)
{
     pfde->lpVtbl->OnFileOk = &FileOK;
     pfde->lpVtbl->OnSelectionChange = &SelectionChange;
     pfde->lpVtbl->OnOverwrite = &DirOverwrite;
}