如何在 C# 中删除网络打印机连接

Question

我的最终目标是取消映射本地工作站上的特定网络打印机。我已经尝试通过 WMI、Windows 脚本宿主和 Winspool.drv Win32 API。我对任何方向的想法都持开放态度。

当使用 WMI 时，我有以下简化的函数，大部分是从 http://www.codeproject.com/Articles/80680/Managing-Printers-Programatically-using-C-and-WMI 复制的：

    public void unmapPrinter()
    {
        ManagementClass win32Printer = new ManagementClass("Win32_Printer");
        ManagementObjectCollection printers = win32Printer.GetInstances();
        foreach (ManagementObject printer in printers)
        {
            printer.Delete();
        }
    }

以示例用户之一或管理员身份在 Windows 8.1 上执行此操作 returns "Access Denied" 使用以下堆栈跟踪：

at System.Management.ManagementException.ThrowWithExtendedInfo(ManagementStatus errorCode)
at System.Management.ManagementObject.Delete(DeleteOptions options)
at System.Management.ManagementObject.Delete()
at PrintCentralClient.Workstation.unmapPrinter(Printer printerToRemove) in C:\projects\PrintCentralClient\PrintCentralClient\Workstation.cs:line 247
at PrintCentralClient.Program.unmapPrinters(FileLogger log, Workstation workstation) in C:\projects\PrintCentralClient\PrintCentralClient\Program.cs:line 310
at PrintCentralClient.Program.Main(String[] args) in C:\projects\PrintCentralClient\PrintCentralClient\Program.cs:line 75
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

powershell 中的相同想法，获取 Win32_Printer 个实例并对它们进行删除，行得通。

$printers = gwmi Win32_Printer
$printers[i].Delete()

关于为什么我的 C# 代码访问被拒绝有什么想法吗？在代码的其他地方，我成功地使用了 Win32_Printer.AddPrinterConnection() 方法。

谢谢。

编辑 1：使用 Windows 脚本主机错误 "This network connection does not exist."

演示函数：

    public void unmapPrinterViaWSH()
    {
        IWshNetwork_Class network = new IWshNetwork_Class();
        network.RemovePrinterConnection(@"\<server>\<printerName>", true, true);
    }

我尝试了一些变体，包括将删除行更改为：

network.RemovePrinterConnection("\\<server>\<printerName>", true, true)

我还尝试枚举打印机连接并使用确切的名称字符串删除：

    public void unmapPrinterViaWSH(Printer printerToRemove)
    {
        IWshNetwork_Class network = new IWshNetwork_Class();
        IWshCollection printers = network.EnumPrinterConnections();
        foreach (object printer in printers)
        {
            if (printer.ToString() == printerToRemove.mappedNameToString())
            {
                network.RemovePrinterConnection(printer.ToString(), true, true);
            }
        }
    }

这失败并出现相同的 "Network connection does not exist" 错误。

Answer 1

对于 WMI：

我缺少 ConnectionsOptions。最初提供的代码示例与它们没有任何关系。在进行早期测试时，我总是先创建范围，然后再创建选项。我发现的另一个参考资料是相反的。这似乎有效。以下是适用于我的代码示例：

public void unmapPrinter()
{
    ConnectionOptions options = new ConnectionOptions();
    options.EnablePrivileges = true;
    ManagementScope scope = new ManagementScope(ManagementPath.DefaultPath, options);
    scope.Connect();
    ManagementClass win32Printer = new ManagementClass("Win32_Printer");
    ManagementObjectCollection printers = win32Printer.GetInstances();
    foreach (ManagementObject printer in printers)
    {
        printer.Delete();
    }
}

Answer 2

如果您只想删除特定的打印机，您可以这样做：

using (var printer = new ManagementObject($"Win32_Printer.DeviceID='{printerPath}'"))
    printer.Delete();

如何在 C# 中删除网络打印机连接

How do I remove a network printer connection in c#

c#

printing

wmi

network-printers