我用WinInet和InternetOpenUrl下载一个文件.正在起作用。但是我想监视进程,所以我尝试添加一个回调函数,但是由于某种原因,它从未被调用过.void CALLBACK DownloadProgress(HINTERNET hInternet, DWORD_PTR dwContext, DWORD dwInternetStatus, LPVOID lpvStatusInformation, DWORD dwStatusInformationLength) // this function never gets called
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