//引入命名空间：using System.Runtime.InteropServices;[DllImport("Winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]private static extern bool SetDefaultPrinter(string printerName);[DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]private static extern bool GetDefaultPrinter(StringBuilder pszBuffer, ref int pcchBuffer);/// <summary>/// 获取默认打印机 /// </summary>/// <returns></returns>public static string GetDefaultPrinter(){const int ERROR_FILE_NOT_FOUND = 2;const int ERROR_INSUFFICIENT_BUFFER = 122;int pcchBuffer = 0;if (GetDefaultPrinter(null, ref pcchBuffer)){return "";}int lastWin32Error = Marshal.GetLastWin32Error();if (lastWin32Error == ERROR_INSUFFICIENT_BUFFER){StringBuilder pszBuffer = new StringBuilder(pcchBuffer);if (GetDefaultPrinter(pszBuffer, ref pcchBuffer)){return pszBuffer.ToString();}lastWin32Error = Marshal.GetLastWin32Error();}if (lastWin32Error == ERROR_FILE_NOT_FOUND){return "";}return "";}

/// <summary>/// 获取打印机的打印列表/// </summary>/// <param name="printName">打印机名称，本地</param>/// <returns>返回打印队列中文档名称字符串，多个之间用逗号连接</returns>public static string GetPrintJobs(string printName){StringBuilder result = new StringBuilder();IntPtr handle;int FirstJob = 0;int NumJobs = 127;int pcbNeeded;int pcReturned;// open printer OpenPrinter(printName, out handle, IntPtr.Zero);// get num bytes required, here we assume the maxt job for the printer quest is 128 (0..127) EnumJobs(handle, FirstJob, NumJobs, 1, IntPtr.Zero, 0, out pcbNeeded, out pcReturned);// allocate unmanaged memory IntPtr pData = Marshal.AllocHGlobal(pcbNeeded);// get structs EnumJobs(handle, FirstJob, NumJobs, 1, pData, pcbNeeded, out pcbNeeded, out pcReturned);// create array of managed job structs JOB_INFO_1[] jobs = new JOB_INFO_1[pcReturned];// marshal struct to managed int pTemp = pData.ToInt32(); //start pointer for (int i = 0; i < pcReturned; ++i){jobs[i] = (JOB_INFO_1)Marshal.PtrToStructure(new IntPtr(pTemp), typeof(JOB_INFO_1));result.Append(jobs[i].pDocument);result.Append(",");pTemp += Marshal.SizeOf(typeof(JOB_INFO_1));}// cleanup unmanaged memory
            Marshal.FreeHGlobal(pData);// close printer
            ClosePrinter(handle);return result.ToString();}