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我正在通过以下代码上传文件。

成功上传后，我尝试删除文件，但收到 32 - File in use 错误。

谁能告诉我如何解决这个文件使用中的错误？以下代码正在上传文件，但完成后不释放它..

var
  HTTP: TidHTTP;
  SSLIOHandler: TIdSSLIOHandlerSocketOpenSSL;
  PostData: TIdMultiPartFormDataStream;
  ResponseStream: TStringStream;
  Delete : Boolean;

begin
  ResponseStream := TStringStream.Create('');
  HTTP := TidHTTP.Create(nil);
  SSLIOHandler := TIdSSLIOHandlerSocketOpenSSL.Create(nil);

  try
    SSLIOHandler.SSLOptions.Method := sslvSSLv3;
    HTTP.ReadTimeout := 30000; //30 seconds
    HTTP.ConnectTimeout := 30000; //30 seconds
    HTTP.IOHandler := SSLIOHandler;
    HTTP.HTTPOptions := [hoKeepOrigProtocol];
    HTTP.ProtocolVersion := pv1_1;
    PostData := TIdMultiPartFormDataStream.Create;

    PostData.AddFormField('username', 'demo');
    PostData.AddFormField('password', 'demo');
    PostData.AddFormField('action', 'upload');
    PostData.AddFormField('accountno', 'demo');

  PostData.AddFile('uploadedfile', FileName, GetMIMETypeFromFile(FileName));

  HTTP.Request.ContentType := PostData.RequestContentType;
  HTTP.Post('http://uploadsite.com/ex/exampleAPI.asmx/Process', PostData, ResponseStream);

  if AnsiContainsStr(ResponseStream.DataString, 'Done') then
    Delete := True;

finally
  SSLIOHandler.Free;
  HTTP.Free;
  ResponseStream.Free;
end;

if Delete then
  if DeleteFile(BFlashFileName) then
    ShowMessage('Deleted')
  else ShowMessage(BFlashFileName+' not deleted, error = '+
               IntToStr(GetLastError));
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1 回答 1

5

在尝试删除文件之前调用实例的Clear方法。TIdMultiPartFormDataStream如果您不再需要它，释放它也将等同于（即PostData.Free）。目前，您似乎正在泄漏PostData变量。

在TIdMultiPartFormDataStream清除其 Fields 集合时，该AddFile方法创建的文件流将在关闭文件句柄时被销毁。

于 2012-06-08T23:35:06.683 回答