在C＃中打印到LPT1

如何使用文件LPT1直接打印到C＃中的点阵打印机。

我用Copen在C ++上做过，但我不知道如何在c＃中做到这一点。

非常感谢你

Answer 1

在Windows中将打印机设置为Generic / Text Only，然后打印到它。

这是我用来打印到具有自己的编码文本格式的标签打印机的代码。

using System; using System.Collections.Generic; using System.Text; using System.Drawing; using System.Drawing.Printing; using System.Windows.Forms; using System.Runtime.InteropServices; using System.IO; namespace whatever { public class RawPrinterHelper { // Structure and API declarions: [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; } [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); // SendBytesToPrinter() // When the function is given a printer name and an unmanaged array // of bytes, the function sends those bytes to the print queue. // Returns true on success, false on failure. 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; // Assume failure unless you specifically succeed. di.pDocName = "My C#.NET RAW Document"; di.pDataType = "RAW"; // Open the printer. if (OpenPrinter(szPrinterName.Normalize(), out hPrinter, IntPtr.Zero)) { // Start a document. if (StartDocPrinter(hPrinter, 1, di)) { // Start a page. if (StartPagePrinter(hPrinter)) { // Write your bytes. bSuccess = WritePrinter(hPrinter, pBytes, dwCount, out dwWritten); EndPagePrinter(hPrinter); } EndDocPrinter(hPrinter); } ClosePrinter(hPrinter); } // If you did not succeed, GetLastError may give more information // about why not. if (bSuccess == false) { dwError = Marshal.GetLastWin32Error(); } return bSuccess; } public static bool SendFileToPrinter(string szPrinterName, string szFileName) { // Open the file. FileStream fs = new FileStream(szFileName, FileMode.Open); // Create a BinaryReader on the file. BinaryReader br = new BinaryReader(fs); // Dim an array of bytes big enough to hold the file's contents. Byte[] bytes = new Byte[fs.Length]; bool bSuccess = false; // Your unmanaged pointer. IntPtr pUnmanagedBytes = new IntPtr(0); int nLength; nLength = Convert.ToInt32(fs.Length); // Read the contents of the file into the array. bytes = br.ReadBytes(nLength); // Allocate some unmanaged memory for those bytes. pUnmanagedBytes = Marshal.AllocCoTaskMem(nLength); // Copy the managed byte array into the unmanaged array. Marshal.Copy(bytes, 0, pUnmanagedBytes, nLength); // Send the unmanaged bytes to the printer. bSuccess = SendBytesToPrinter(szPrinterName, pUnmanagedBytes, nLength); // Free the unmanaged memory that you allocated earlier. Marshal.FreeCoTaskMem(pUnmanagedBytes); return bSuccess; } public static bool SendStringToPrinter(string szPrinterName, string szString) { IntPtr pBytes; Int32 dwCount; // How many characters are in the string? dwCount = szString.Length; // Assume that the printer is expecting ANSI text, and then convert // the string to ANSI text. pBytes = Marshal.StringToCoTaskMemAnsi(szString); // Send the converted ANSI string to the printer. bool success = SendBytesToPrinter(szPrinterName, pBytes, dwCount); Marshal.FreeCoTaskMem(pBytes); return success; } } } 

然后从另一个类调用这个：

  private bool PrintLabels(string printerName) { return RawPrinterHelper.SendStringToPrinter(printerName, this.Text); } 

（编辑：如果有人看到任何与非托管资源相关的重大fubars，请在评论中告诉我）

Answer 2

也许你不能打印到设备“LPT1”，而是打印到你必须先安装的“哑电传打印机”。 如果它们存在于现代窗口中……那么你应该打印到“mydumbprinter”，而mydumbprinter又使用LPT1作为打印机端口。 在我看来，当我按照Cocowalla上面的Source链接时 – 在那里你选择PrinterDialog中的打印机。 生成的打印机名称更可能是“Laserjet”而不是“LPT1”。

Answer 3

在C＃中它可能，首先你需要使用CreateFile方法连接到该端口，然后打开一个文件流到该端口，最后写入它。 这是一个示例类，它在LPT1上将两行写入打印机。

 using Microsoft.Win32.SafeHandles; using System; using System.IO; using System.Runtime.InteropServices; namespace YourNamespace { public static class Print2LPT { [DllImport("kernel32.dll", SetLastError = true)] static extern SafeFileHandle CreateFile(string lpFileName, FileAccess dwDesiredAccess,uint dwShareMode, IntPtr lpSecurityAttributes, FileMode dwCreationDisposition, uint dwFlagsAndAttributes, IntPtr hTemplateFile); public static bool Print() { string nl = Convert.ToChar(13).ToString() + Convert.ToChar(10).ToString(); bool IsConnected= false; string sampleText ="Hello World!" + nl + "Enjoy Printing..."; try { Byte[] buffer = new byte[sampleText.Length]; buffer = System.Text.Encoding.ASCII.GetBytes(sampleText); SafeFileHandle fh = CreateFile("LPT1:", FileAccess.Write, 0, IntPtr.Zero, FileMode.OpenOrCreate, 0, IntPtr.Zero); if (!fh.IsInvalid) { IsConnected= true; FileStream lpt1 = new FileStream(fh,FileAccess.ReadWrite); lpt1.Write(buffer, 0, buffer.Length); lpt1.Close(); } } catch (Exception ex) { string message = ex.Message; } return IsConnected; } } } 

假设您的打印机已连接到LPT1端口，如果不是，则需要调整CreateFile方法以匹配您正在使用的端口。

您可以使用以下行在程序中的任何位置调用该方法

 Print2LPT.Print(); 

我认为这是解决问题的最短，最有效的解决方案。