在某些情况下
我们需要枚举网内的打印机
试试以下的代码
很有可能帮得了你
using System;
using SystemRuntimeInteropServices;
using SystemRuntimeSerialization;
namespace SampleGetPrinter
{
class App
{
static void Main(string[] args)
{
ConsoleWriteLine(请输入你想搜索类型的序号:);
ConsoleWriteLine( Default printer(only WinWinWinME)\n Enumerates the locally installed printers;\n Enumerates the list of printers to which the user has made previous connections;\n Enumerates the printer identified by Name;\n Enumerates network printers and print servers in the computers domain;\n Enumerates printers that have the shared attribute;\n Enumerates network printers in the computers domain;\n==========================);
int pt =;
try
{
pt=IntParse(ConsoleReadLine());
}
catch(Exception e)
{
ConsoleWriteLine(错误信息: {}eMessage);
return;
}
PRINTER_ENUM printerKind = GetPrinterConType(pt);
PrinterSearcher p = new PrinterSearcher();
PrinterSearcherPrinterInfo[] printers = pSearch(printerKind);
foreach(PrinterSearcherPrinterInfo pi in printers)
{
ConsoleWriteLine(=====================================\n打印机名: {}\n描叙:: {}\n注释: {}\n=====================================\n
piName piDescription piComment);
}
}
static PRINTER_ENUM GetPrinterConType(int ins)
{
switch(ins)
{
case :
return PRINTER_ENUMDEFAULT ;
case :
return PRINTER_ENUMLOCAL;
case :
return PRINTER_ENUMCONNECTIONS;
case :
return PRINTER_ENUMNAME;
case :
return PRINTER_ENUMREMOTE;
case :
return PRINTER_ENUMSHARED;
case :
return PRINTER_ENUMNETWORK;
default:
return PRINTER_ENUMLOCAL ;
}
}
}
#region 打印机位置状态枚举 PRINTER_ENUM
public enum PRINTER_ENUM
{
DEFAULT = x
LOCAL = x
CONNECTIONS = x
NAME = x
REMOTE = x
SHARED = x
NETWORK = x
}
#endregion
#region 异常派生 EnumPrinterException
[Serializable]
public class EnumPrinterException: ApplicationException
{
public EnumPrinterException() { }
public EnumPrinterException (string message): base(message) { }
public EnumPrinterException (string message Exception inner):
base(message inner) {}
protected EnumPrinterException (SerializationInfo info
StreamingContext context) : base(info context)
{ }
}
#endregion
//加上这个属性可以按导出到非托管对像的顺序排序
[StructLayout(LayoutKindSequential CharSet = CharSetAuto)]
public class PRINTER_INFO_
{
public int flags;
public IntPtr pDescription;
public IntPtr pName;
public IntPtr pComment;
}
public class PrinterSearcher
{
#region Search
public PrinterInfo[] Search(PRINTER_ENUM printerKind)
{
PrinterInfo[] pInfo = new PrinterInfo[];
uint iNeeded = iReturned = iSize = ;
IntPtr printers = IntPtrZero;
if (!EnumPrinters(printerKind StringEmptyprinters ref iNeeded ref iReturned) )
{
//返回由上一个非托管函数返回的错误代码该函数是使用设置了
//DllImport属性中SetLastError=true 标志的平台调用来调用的
int err = MarshalGetLastWinError();
if (err != WinErrorERROR_INSUFFICIENT_BUFFER)
ThrowEnumPrinterException();
}
iSize = iNeeded;
if (iNeeded != )
{
try
{
//使用AllocHGlobal分配非托管内块
printers = MarshalAllocHGlobal(new IntPtr(iSize));
//如果调用不成功抛出异常
if (!EnumPrinters(printerKind StringEmptyprinters iSize ref iNeeded ref iReturned) )
{
ThrowEnumPrinterException();
}
else
{
pInfo = GetPrinterInfoFromMemory(printers iReturned);
}
}
finally
{
//释放分配的内存块
if (printers != IntPtrZero)
MarshalFreeHGlobal(printers);
}
}
return pInfo;
}
#endregion
#region PrinterInfo
public struct PrinterInfo
{
public string Name;
public string Description;
public string Comment;
}
public sealed class WinError
{
private WinError() {}
public const int ERROR_INSUFFICIENT_BUFFER = ;
}
#endregion
#region EnumPrinters
[DllImport(winspooldrv SetLastError = true CharSet = CharSetAuto)]
[return: MarshalAs(UnmanagedTypeBool)]
private static extern bool EnumPrinters ([MarshalAs(UnmanagedTypeU)] PRINTER_ENUM flags
[MarshalAs(UnmanagedTypeLPStr)] string sName
uint iLevel
IntPtr pPrinterDesc
uint iSize
[MarshalAs(UnmanagedTypeU)] ref uint iNeeded
[MarshalAs(UnmanagedTypeU)] ref uint iReturned
);
#endregion
#region GetPrinterInfoFromMemory
private PrinterInfo[] GetPrinterInfoFromMemory(IntPtr prInfo uint numPrinters)
{
PRINTER_INFO_ pi = new PRINTER_INFO_();
PrinterInfo[] pInfo = new PrinterInfo[numPrinters];
for(int i = ; i < numPrinters; i++)
{
//把数据从非托管内存传送到到托管内存
MarshalPtrToStructure(prInfo pi);
pInfo[i]Name = MarshalPtrToStringAuto(pipName);
pInfo[i]Description = MarshalPtrToStringAuto(pipDescription);
pInfo[i]Comment = MarshalPtrToStringAuto(pipComment);
prInfo =new IntPtr(prInfoToInt() + MarshalSizeOf(typeof(PRINTER_INFO_)));
}
return pInfo;
}
private void ThrowEnumPrinterException()
{
throw new EnumPrinterException(stringFormat(LastErrorCode: {}
MarshalGetLastWinError()));
}
#endregion
}
}
