Question

我制作了一个filewatcher服务，它读取放在目录中的每个XML文件并在标签上打印内容（Visual Studio 2012，Report viewer 2010）。服务在Windows 8上运行正常，但在服务器2008 R2上，每次复制目录中的文件时都会崩溃。

public partial class MyService : ServiceBase
{
    public MyService ()
    {

        InitializeComponent();

        GetSourcePath();
    }

    private void GetSourcePath()
    {
        RegistryKey myKey = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Company\\MyService", false);
        if (myKey == null)
        {
            fsw.Path = @"C:\Source\";
        }
        else
        {
            fsw.Path = (string)myKey.GetValue("SourcePath");
        }
    }

    protected override void OnStart(string[] args)
    {
        base.OnStart(args);
        fsw.EnableRaisingEvents = true;
    }

    protected override void OnPause()
    {
        base.OnPause();
        fsw.EnableRaisingEvents = false;
    }


    protected override void OnContinue()
    {
        base.OnContinue();
        GetSourcePath();
        fsw.EnableRaisingEvents = true;
    }

    private void fsw_Created(object sender, FileSystemEventArgs e)
    {
        System.Threading.Thread.Sleep(2000);

        ReportViewer reportViewer = new ReportViewer();

        reportViewer.ProcessingMode = ProcessingMode.Local;
        reportViewer.LocalReport.ReportPath = @"rptLabel.rdlc";
        reportViewer.LocalReport.DataSources.Add(new ReportDataSource("DataSet", PrintLabel.GetPrintLabels(e.FullPath)));
        reportViewer.RefreshReport();

        AutoPrint.Export(reportViewer.LocalReport);
        AutoPrint.Print();
    }

    protected override void OnStop()
    {
        fsw.EnableRaisingEvents = false;
    }

}

这里是其他类的代码

 public class AutoPrint
{
    private static int m_currentPageIndex;
    private static IList<Stream> m_streams;

    public static Stream CreateStream(string name, string fileNameExtension, Encoding encoding, string mimeType, bool willSeek)
    {
        Stream stream = new MemoryStream();
        m_streams.Add(stream);
        return stream;
    }


    public static void Export(LocalReport report)
    {
        string deviceInfo =
          @"<DeviceInfo>
            <OutputFormat>EMF</OutputFormat>
            <PageWidth>10cm</PageWidth>
            <PageHeight>4cm</PageHeight>
            <MarginTop>0</MarginTop>
            <MarginLeft>0</MarginLeft>
            <MarginRight>0</MarginRight>
            <MarginBottom>0</MarginBottom>
        </DeviceInfo>";

        Warning[] warnings;
        m_streams = new List<Stream>();

        try
        {
            report.Render("Image", deviceInfo, CreateStream, out warnings);
        }
        catch (Exception exc)
        {
            System.Diagnostics.EventLog.WriteEntry("My Service", DateTime.Now.ToLongTimeString() + " Error rendering print : " + exc.Message);
            foreach (Stream stream in m_streams)
            {
                stream.Position = 0;
            }
        }

    }

    public static void Print()
    {
        PrintDocument printDoc = new PrintDocument();

        if(printDoc.PrinterSettings.IsDefaultPrinter) printDoc.PrinterSettings.PrinterName = "Printer Name";

        if (m_streams == null || m_streams.Count == 0) System.Diagnostics.EventLog.WriteEntry("MyService", DateTime.Now.ToLongTimeString() + " Error: no stream to print.");

        if (!printDoc.PrinterSettings.IsValid)
        {
            System.Diagnostics.EventLog.WriteEntry("MyService", DateTime.Now.ToLongTimeString() + " Error: cannot find the default printer.");
        }
        else
        {
            printDoc.PrintPage += new PrintPageEventHandler(PrintPage);
            m_currentPageIndex = 0;
            printDoc.Print();
        }
    }

    public static void PrintPage(object sender, PrintPageEventArgs ev)
    {

        try
        {
            Metafile pageImage = new Metafile(m_streams[m_currentPageIndex]);

            // Adjust rectangular area with printer margins.
            Rectangle adjustedRect = new Rectangle(
                ev.PageBounds.Left - (int)ev.PageSettings.HardMarginX,
                ev.PageBounds.Top - (int)ev.PageSettings.HardMarginY,
                ev.PageBounds.Width,
                ev.PageBounds.Height);

            // Draw a white background for the report
            ev.Graphics.FillRectangle(Brushes.White, adjustedRect);

            // Draw the report content
            ev.Graphics.DrawImage(pageImage, adjustedRect);

            // Prepare for the next page. Make sure we haven't hit the end.
            m_currentPageIndex++;
            ev.HasMorePages = (m_currentPageIndex < m_streams.Count);
        }
        catch (Exception exc)
        {
            System.Diagnostics.EventLog.WriteEntry("MyService", DateTime.Now.ToLongTimeString() + " Error rendering print page: " + exc.Message + "Inner exception :" + exc.InnerException );
        }

    }

}

数据还有一个静态类printLabel，但对于这种情况没有任何意义。它只加载数据。这是日志事件

中的第一条错误消息

应用程序：MyService.exe 框架版本：v4.0.30319 描述：由于未处理的异常，进程终止。异常信息：System.IO.FileNotFoundException 堆： at MyService.MyService.fsw_Created（System.Object，System.IO.FileSystemEventArgs）在System.IO.FileSystemWatcher.OnCreated（System.IO.FileSystemEventArgs）在System.IO.FileSystemWatcher.NotifyFileSystemEventArgs（Int32，System.String）在System.IO.FileSystemWatcher.CompletionStatusChanged（UInt32，UInt32，System.Threading.NativeOverlapped *）在System.Threading._IOCompletionCallback.PerformIOCompletionCallback（UInt32，UInt32，System.Threading.NativeOverlapped *）

这是事件日志中的第二条消息

错误应用程序名称：MyService.exe，版本：1.0.0.0，时间戳：0x51349c1b 错误模块名称：KERNELBASE.dll，版本：6.1.7601.17932，时间戳：0x50327672 异常代码：0xe0434352 故障偏移：0x0000c41f 错误进程id：0x2dc4 错误应用程序启动时间：0x01ce18d947393653 错误的应用程序路径：C：\ Program Files（x86）\ Company \ MyService \ MyService.exe 错误模块路径：C：\ Windows \ syswow64 \ KERNELBASE.dll 报告编号：a27c24e2-84cc-11e2-bb34-0019992623e2

我做了一个与控制台相同的应用程序，它运行得很完美。也许该服务没有权限读取文件？我有人有想法......

Answer 1

您正在使用FileNotFoundException并且您正在使用相对路径。这意味着最可能的问题是您的工作目录错误。请尝试使用绝对路径。

有关更多信息，请参阅What directory does a Windows Service run in?

Answer 2

我发现了问题。这是Reportviewer 2010.安装ReportViewer Service Pack 1之后，似乎他不再崩溃了。崩溃发生在以下行：

ReportViewer reportViewer = new ReportViewer();

我也更改了这一行：

reportViewer.LocalReport.ReportEmbeddedResource = "MyService.rptLabel.rdlc";

Server 2008上的Windows filewatcher服务崩溃

2 个答案: