列舉作業中的檔案

若要列舉作業中的檔案，請呼叫 IBackgroundCopyJob：：EnumFiles 方法。 方法會 傳回您用來列舉檔案的 IEnumBackgroundCopyFiles 介面指標。

請注意，列舉清單是您呼叫 EnumFiles 方法時作業中檔案的快照集。 不過，這些檔案對象的屬性值會反映檔案的目前值。

下列範例示範如何列舉作業中的檔案，並擷取其屬性。 此範例假設 IBackgroundCopyJob 介面指標有效。

HRESULT hr = 0;
IBackgroundCopyJob* pJob;
IEnumBackgroundCopyFiles* pFiles = NULL;
IBackgroundCopyFile* pFile = NULL;
IBackgroundCopyFile3* pFile3 = NULL;
WCHAR* pLocalFileName = NULL;
ULONG cFileCount = 0;
ULONG idx = 0;

hr = pJob->EnumFiles(&pFiles);
if (SUCCEEDED(hr))
{
  //Get the count of files in the job. 
  pFiles->GetCount(&cFileCount);

  //Enumerate the files in the job.
  for (idx=0; idx<cFileCount; idx++)
  {
    hr = pFiles->Next(1, &pFile, NULL);
    if (S_OK == hr)
    {
      // Query for the latest file interface.
      hr = pFile->QueryInterface(__uuidof(IBackgroundCopyFile3), (void**)&pFile3);
      pFile->Release();
      if (FAILED(hr))
      {
        wprintf(L"pFile->QueryInterface failed with 0x%x.\n", hr);
        goto cleanup;
      }

      // You can use the interface to retrieve the local and remote file
      // names, get the ranges to download if only part of the file content
      // is requested, determine the progress of the transfer, change the remote file
      // name, get the name of the temporary file that BITS uses to download
      // the file, determine if the file is downloaded from a peer, and set
      // the validation state of the file so it can be shared with peers.

      //Get the local name of the file.
      hr = pFile3->GetLocalName(&pLocalFileName);
      if (SUCCEEDED(hr))
      {
        //Do something with the file information.
      }

      CoTaskMemFree(pLocalFileName); 
      pFile3->Release();
      pFile3 = NULL;
    }
    else
    {
      //Handle error
      break;
    }
  }

  pFiles->Release();
  pFiles = NULL;
}