用HP laserJet 10 HP在.Net中打印

Question

我在HP LaserJet 10 HP打印机上使用LaserJet 2.0打印时遇到了问题。

偶尔(有时一个月一次，有时一天一次)打印机会被“阻塞”，以至于它无法从.net 2.0中打印任何东西。

当调用printDocument.print方法时，即使打印机是从printDialog中选择的，它也会抛出InvalidPrinterException。打印机在线工作(其他所有东西都可以打印在上面)，只有通过.net的打印才会被阻塞。

我发现以下注册表项中存在问题：

HKEY_CURRENT_USER\Printers\DevModePerUser 

如果存在此键，PrintDocument.PrinterSettings.IsValid将报告“false”。当这个键被擦除的时候，PrintDocument.PrinterSettings.IsValid是‘真’并且打印机正在工作。现在我用以下方法解决这个问题:如果打印机是"HP“，而PrinterSettings是'false‘，那么检查注册表键是否存在，删除该键，然后进行打印。现在，我知道这是站不住脚的，但到目前为止，我还没有发现为什么会发生这种情况。我强调，这种情况只发生在HP LaserJet 10 HP打印机上。在此注册表项存在之前，将完全阻止来自.NET的打印。

有人见过这样的错误吗?如果是的话，解决办法是什么？

编辑:这是记录HP1005打印机的注册表项。

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Printers\DevModePerUser]
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Answer 1

我不知道是什么原因造成的，但是知道是什么应用程序设置了这个键可能会对您有所帮助。尝试使用来自http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx的Process中的注册表监视工具