主要使用到winspool.drv中的EnumPrinters函数，代码如下：
[DllImport("winspool.drv", SetLastError = true, CharSet = CharSet.Auto)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool EnumPrinters ([MarshalAs(UnmanagedType.U4)] PRINTER_ENUM flags,
[MarshalAs(UnmanagedType.LPStr)] string sName,
uint iLevel,
IntPtr pPrinterDesc,
uint iSize,
[MarshalAs(UnmanagedType.U4)] ref uint iNeeded,
[MarshalAs(UnmanagedType.U4)] ref uint iReturned
);
说明：Marshal属性提供了对托管代码与非托管代码见数据封送。
EnumPrinters 的 WIN32 API的定义如下：
BOOL EnumPrinters(
DWORD Flags, // printer object types
LPTSTR Name, // name of printer object
DWORD Level, // information level
LPBYTE pPrinterEnum, // printer information buffer 数据挖掘交友
DWORD cbBuf, // size of printer information buffer
LPDWORD pcbNeeded, // bytes received or required
LPDWORD pcReturned // number of printers enumerated
);
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