[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]public class DOCINFOA{[MarshalAs(UnmanagedType.LPStr)]public string pDocName;[MarshalAs(UnmanagedType.LPStr)]public string pOutputFile;[MarshalAs(UnmanagedType.LPStr)]public string pDataType;}public class PrintCode{[DllImport("winspool.Drv", EntryPoint = "OpenPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]public static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPStr)] string szPrinter, out IntPtr hPrinter, IntPtr pd);[DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]public static extern bool ClosePrinter(IntPtr hPrinter);[DllImport("winspool.Drv", EntryPoint = "StartDocPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]public static extern bool StartDocPrinter(IntPtr hPrinter, Int32 level, [In, MarshalAs(UnmanagedType.LPStruct)] DOCINFOA di);[DllImport("winspool.Drv", EntryPoint = "EndDocPrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]public static extern bool EndDocPrinter(IntPtr hPrinter);[DllImport("winspool.Drv", EntryPoint = "StartPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]public static extern bool StartPagePrinter(IntPtr hPrinter);[DllImport("winspool.Drv", EntryPoint = "EndPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]public static extern bool EndPagePrinter(IntPtr hPrinter);[DllImport("winspool.Drv", EntryPoint = "WritePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]public static extern bool WritePrinter(IntPtr hPrinter, IntPtr pBytes, Int32 dwCount, out Int32 dwWritten);/// <summary>/// 该方法把非托管内存中的字节数组发送到打印机的打印队列/// </summary>/// <param name="szPrinterName">打印机名称</param>/// <param name="pBytes">非托管内存指针</param>/// <param name="dwCount">字节数</param>/// <returns>成功返回true，失败时为false</returns>public static bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes, Int32 dwCount){Int32 dwError = 0, dwWritten = 0;IntPtr hPrinter = new IntPtr(0);DOCINFOA di = new DOCINFOA();bool bSuccess = false;di.pDocName = "My C#.NET RAW Document";di.pDataType = "RAW";try{// 打开打印机if (OpenPrinter(szPrinterName.Normalize(), out hPrinter, IntPtr.Zero)){// 启动文档打印if (StartDocPrinter(hPrinter, 1, di)){// 开始打印if (StartPagePrinter(hPrinter)){// 向打印机输出字节bSuccess = WritePrinter(hPrinter, pBytes, dwCount, out dwWritten);EndPagePrinter(hPrinter);}EndDocPrinter(hPrinter);}ClosePrinter(hPrinter);}if (bSuccess == false){dwError = Marshal.GetLastWin32Error();}}catch (Win32Exception ex){WriteLog(ex.Message);bSuccess = false;}return bSuccess;}/// <summary>/// 发送文件到打印机方法/// </summary>/// <param name="szPrinterName">打印机名称</param>/// <param name="szFileName">打印文件的路径</param>/// <returns></returns>public static bool SendFileToPrinter(string szPrinterName, string szFileName){bool bSuccess = false;try{// 打开文件FileStream fs = new FileStream(szFileName, FileMode.Open);// 将文件内容读作二进制BinaryReader br = new BinaryReader(fs);// 定义字节数组Byte[] bytes = new Byte[fs.Length];// 非托管指针IntPtr pUnmanagedBytes = new IntPtr(0);int nLength;nLength = Convert.ToInt32(fs.Length);// 读取文件内容到字节数组bytes = br.ReadBytes(nLength);// 为这些字节分配一些非托管内存pUnmanagedBytes = Marshal.AllocCoTaskMem(nLength);// 将托管字节数组复制到非托管内存指针Marshal.Copy(bytes, 0, pUnmanagedBytes, nLength);// 将非托管字节发送到打印机bSuccess = SendBytesToPrinter(szPrinterName, pUnmanagedBytes, nLength);// 释放先前分配的非托管内存Marshal.FreeCoTaskMem(pUnmanagedBytes);fs.Close();fs.Dispose();}catch (Win32Exception ex){WriteLog(ex.Message);bSuccess = false;}return bSuccess;}/// <summary>/// 将字符串发送到打印机方法/// </summary>/// <param name="szPrinterName">打印机名称</param>/// <param name="szString">打印的字符串</param>/// <returns></returns>public static bool SendStringToPrinter(string szPrinterName, string szString){bool flag = false;try{IntPtr pBytes;Int32 dwCount;// 获取字符串长度dwCount = szString.Length;// 将字符串复制到非托管 COM 任务分配的内存非托管内存块，并转换为 ANSI 文本pBytes = Marshal.StringToCoTaskMemAnsi(szString);// 将已转换的 ANSI 字符串发送到打印机flag = SendBytesToPrinter(szPrinterName, pBytes, dwCount);// 释放先前分配的非托管内存Marshal.FreeCoTaskMem(pBytes);}catch (Win32Exception ex){WriteLog(ex.Message);flag = false;}return flag;}/// <summary>/// 写入日志方法/// </summary>/// <param name="msg">记录信息</param>public static void WriteLog(string msg){string str = string.Empty;string path = AppDomain.CurrentDomain.BaseDirectory + "log\\" + DateTime.Now.ToString("yyyy-MM-dd") + ".txt";FileStream filestream = new FileStream(path, FileMode.OpenOrCreate);str += "************" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + "************\r\n";str += msg;str += "************" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + "************\r\n";FileStream fs = new FileStream(path, FileMode.Append);StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.Default);sw.WriteLine(str);sw.Flush();sw.Close();sw.Dispose();fs.Close();fs.Dispose();}}
以上就是全部代码了，调用就很简单了，方法如下：
private void Print_Click(object sender, EventArgs e){//打印文件的路径，该方法获取到的文件路径在应用程序 bin\Debug\ 目录下，所以 ../../ 向上两级目录string fileName = AppDomain.CurrentDomain.BaseDirectory + @"../../File/demo.txt";if (PrintCode.SendFileToPrinter("PrinterName", fileName)){MessageBox.Show("文件已成功发送至打印队列！","提示信息");}}
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