Question

此问题与URLDownloadToFile API的使用情况有关。

我在Visual C ++ MFC应用程序中使用URLDownloadToFile。在Windows Server 2008上，该程序运行正常。

示例代码：

// invalidate cache, so file is always downloaded from web site
// (if not called, the file will be retrieved from the cache if
// it's already been downloaded.)
DeleteUrlCacheEntry(aCSVDownloadURL);

CallbackHandler callbackHandler;
IBindStatusCallback* pBindStatusCallback = NULL;
callbackHandler.QueryInterface(IID_IBindStatusCallback,
    reinterpret_cast<void**>(&pBindStatusCallback));

HRESULT hr = URLDownloadToFile(
    NULL,   // A pointer to the controlling IUnknown interface
    DownloadURL,
    FileName, // Filename to save the downloaded file in local
    0,      // Reserved. Must be set to 0.
    pBindStatusCallback // Callback interface to catch the download response; basically the file name
);

if (hr == S_OK)
{
    cout << "Download OK" << endl;
}
else if (hr == E_OUTOFMEMORY)
{
    cout << "The buffer length is invalid, or there is insufficient memory to complete the operation." << endl;
} else if (hr == INET_E_DOWNLOAD_FAILURE)
{
    cout << "The specified resource or callback interface was invalid." << endl;
}
else {
    cout << "Other error" << endl;
}

但是当在Windows Server 2012 R2中运行应用程序时，我收到以下错误：

错误代码：INET_E_DOWNLOAD_FAILURE
描述：指定的资源或回调接口无效。

谷歌搜索了几个小时，但仍然没有运气。如果有解决方案，我们将非常感激。

该程序是使用Visual Studio 2015

创建的

无法在Visual C ++中使用URLDownloadToFile下载文件

0 个答案: