我制作了一个文件观察器服务，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 上运行良好，但在服务器 2008 R2 上，每次我在目录中复制文件时都会崩溃。
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;
}
}
这里是另一个类的代码
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，但在这种情况下没有什么有趣的。它只加载数据。这是来自日志事件的第一条错误消息
应用程序：MyService.exe 框架版本：v4.0.30319 描述：进程因未处理的异常而终止。异常信息：System.IO.FileNotFoundException 堆栈：在 System.IO.FileSystemWatcher.OnCreated(System.IO.FileSystemEventArgs) 在 System.IO.FileSystemWatcher.NotifyFileSystemEventArgs 在 MyService.MyService.fsw_Created(System.Object, System.IO.FileSystemEventArgs) (Int32, System.String) 在 System.IO.FileSystemWatcher.CompletionStatusChanged(UInt32, UInt32, System.Threading.NativeOverlapped*) 在 System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32, UInt32, System.Threading.NativeOverlapped*)
这是来自事件日志的第二条消息
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 错误偏移：0x0000c41f 错误进程 id：0x2dc4 错误应用程序启动时间：0x01ce18d947393653 错误应用程序路径：C:\Program Files (x86)\Company\MyService\MyService.exe 错误模块路径：C:\Windows\syswow64\KERNELBASE.dll 报告 ID：a27c24e2-84cc-11e2-bb34- 0019992623e2
我制作了与控制台相同的应用程序，它运行良好。也许该服务没有读取文件的权限？我有人有一个想法...