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C#调用WIN32API系列二列举局网内共享打印机 (转)

原创 IT综合 作者:amyz 时间:2007-10-14 14:54:56 0 删除 编辑
C#调用WIN32API系列二列举局网内共享打印机 (转)[@more@]

C#调用win32api系列二列举局网内共享打印机
 C#通过调用WIN32API可以实现非常强大的功能,本文将着重讲述如何通过调用WIN32API实现列举局域网络内所有共享的打印机。
 首先我们看看EnumPrinters函数的定义
BOOL EnumPrinters(
  Dword Flags,  // printer object types
  LPTSTR Name,  // name of printer object
  DWORD Level,  // information level
  LPBYTE pPrinterEnum, // printer information buffer
  DWORD cbBuf,  // size of printer information buffer
  LPDWORD pcbNeeded,  // bytes received or required
  LPDWORD pcReturned  // number of printers enumerated
);
 这个api有几个返回参数, 其中最重要的是pPrinterEnum所指的缓冲区中,是一个
PRINTER_INFO_N的结构数组, 这里N根据Level参数而变化, 这里我们用的是1, 所以用到的结构是
typedef struct _PRINTER_INFO_1 {
  DWORD  Flags;
  LPTSTR pDescription;
  LPTSTR pName;
  LPTSTR pComment;
} PRINTER_INFO_1

C#要调用API首先要引入动态库,EnumPrinters在winspool.drv这个动态库中。引入语句如下
[DllImport("winspool.drv", CharSet=CharSet.Auto)]
然后是定义PRINTER_INFO_1结构
 [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
 struct PRINTER_INFO_1
 {
 int flags;
 [MarshalAs(UnmanagedType.LPTStr)]
 public string pDescription;
 [MarshalAs(UnmanagedType.LPTStr)]
 public string pName;
 [MarshalAs(UnmanagedType.LPTStr)]
 public string pComment;
 }
 好了,全部的源代码如下:
using System;
using System.Collections;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.Drawing.Printing;
public class QuickTest {
 [DllImport("winspool.drv", CharSet=CharSet.Auto)]
 static extern bool EnumPrinters(int flags, string name, int level, IntPtr pPrinterEnum,
 int cbBuf, out int pcbNeeded, out int pcReturned);
 
 private const int PRINTER_ENUM.NETWORK = 0x00000040;
 private const int PRINTER_ENUM_LOCAL = 0x00000002;
 private const int PRINTER_ENUM_REMOTE  = 0x00000010;
 [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
 struct PRINTER_INFO_1
 {
 int flags;
 [MarshalAs(UnmanagedType.LPTStr)]
 public string pDescription;
 [MarshalAs(UnmanagedType.LPTStr)]
 public string pName;
 [MarshalAs(UnmanagedType.LPTStr)]
 public string pComment;
 }
 
 public void EnumeratePrintersWin()
 {
 bool Success;
 int cbRequired;
 int nEntries;
 
 IntPtr outb = IntPtr.Zero;
 
 Success = EnumPrinters(PRINTER_ENUM_NETWORK | PRINTER_ENUM_LOCAL | PRINTER_ENUM_REMOTE, null , 1, outb, 0, out cbRequired, out nEntries);
 outb = Marshal.AllocHGlobal(cbRequired);
 Success = EnumPrinters(PRINTER_ENUM_NETWORK | PRINTER_ENUM_LOCAL | PRINTER_ENUM_REMOTE, null , 1, outb, cbRequired, out cbRequired, out nEntries);
 
 PRINTER_INFO_1[] portsArray = new PRINTER_INFO_1[cbRequired];
 

 IntPtr current = outb;
 try {
 for (int i=0; i {
 portsArray[i] = (PRINTER_INFO_1) Marshal.PtrToStructure(current,
 typeof(PRINTER_INFO_1));
 current=(IntPtr)((int)current+Marshal.SizeOf(typeof(PRINTER_INFO_1)));
 Console.WriteLine(i+": n"+portsArray[i].pName+"n"+portsArray[i].pDescription+"n"+portsArray[i].pComment+"n");
 }
 }
 catch (Exception) {
 //Console.WriteLine(exp.StackTrace);
 }
 Marshal.FreeHGlobal(outb);
 }
 public QuickTest () {

 }
 public static void Main() {
 QuickTest qt = new QuickTest();
 qt.EnumeratePrintersWin();
 }
}
联系作者Mailto:zlyperson@163.net">zlyperson@163.net


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