小编Ahm*_*Ali的帖子

我正在使用下面显示的java代码在连接到我的计算机的HP DeskJet1000 USB打印机上打印文本文件.每当我运行此代码时,都会发送打印作业,但打印机不会打印任何内容.状态显示打印机正在打印,但它甚至没有进入页面.请帮忙!我的代码如下:

package printing;

import java.io.FileInputStream;
import javax.print.*;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;

/** @author Majid */
public class Printing {
    public static void main (String [] args) {
        // TODO code application logic here
        DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE;
        PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet ();
        /* locate a print service that can handle it */
        PrintService [] pservices = PrintServiceLookup.lookupPrintServices (flavor, aset);
        /* create a print job for the chosen service */
        int printnbr = 0;
        DocPrintJob pj = pservices …

我在 C# 中编写了一个简单的用户定义函数，它获取 IP 地址并针对它返回主机名，代码如下：

public partial class UserDefinedFunctions
{
    [Microsoft.SqlServer.Server.SqlFunction]
    public static SqlString getname(String ipAddress)
    {
        System.Data.SqlClient.SqlClientPermission pSql = new SqlClientPermission(System.Security.Permissions.PermissionState.Unrestricted);
        pSql.Assert();

        System.Security.PermissionSet psql1 = new PermissionSet(System.Security.Permissions.PermissionState.Unrestricted);
        psql1.Assert();

        System.Net.DnsPermission psql = new DnsPermission(System.Security.Permissions.PermissionState.Unrestricted);
        psql.Assert();

        System.Security.Permissions.SecurityPermission psql2 = new SecurityPermission(System.Security.Permissions.PermissionState.Unrestricted);
        psql2.Assert();

        IPHostEntry host = Dns.GetHostEntry(ipAddress);
        return new SqlString(host.HostName.ToString());
    }
}

现在我已经部署了它但是当我尝试在 sql 中调用这个函数时： select dbo.getname('10.10.10.10')

它返回此错误：

Msg 6522, Level 16, State 2, Line 7
A .NET Framework error occurred during execution of user-defined routine or aggregate "getname": 
System.Security.SecurityException: Request for …