发送原始数据以打印不起作用

我想发送原始数据进行打印，避免选择打印机（快速打印）。

我正在尝试使用Microsoft提供的这个帮助程序： https ： //support.microsoft.com/en-us/kb/322091#top

但是，当我调用该方法时：

RawPrinterHelper.SendStringToPrinter(pd.PrinterSettings.PrinterName, s); 

我的打印机开始工作（产生一些噪音），但它从不需要白纸并开始打印。

我用两台打印机试过它，两台打印机的行为都是一样的。 此外，我放弃了打印机坏了的可能性，因为我可以打印其他文件。

有什么不对？

Answer 1

Fran_gg7，我最近遇到了同样的问题。 首先，打开打印机上文档的持久性。 这将允许您查看打印机是否成功接收到打印请求。

您将在打印机队列中看到项目，它们将保留在那里。

在我的场景中，打印请求被正确地发送到打印机，但是我在激光打印机上测试它，最终无法解释我传递给它的原始字符串数据。

我在标签打印机上测试了相同的输出，它可以理解我传递的ZPL（斑马编程语言）并且它的工作正常。

看看这个有详细解释

希望这可以帮助。

Answer 2

试试这个：

 using System; using System.Drawing; using System.Drawing.Printing; using System.IO; using System.Runtime.InteropServices; using System.Windows.Forms; 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? // Fix from Nicholas Piasecki: // dwCount = szString.Length; dwCount = (szString.Length + 1) * Marshal.SystemMaxDBCSCharSize; // 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. SendBytesToPrinter(szPrinterName, pBytes, dwCount); Marshal.FreeCoTaskMem(pBytes); return true; } } 

Answer 3

如果使用“RawPrinterHelper”方法将纯文本打印到Dot Matrix，只有当我手动添加打印机，选择Generic / Text Only，并选择分配给USB连接打印机的USB001端口时，它才能正常工作（我的okidata）测试）。 然后RawPrinterHelper.SendStringToPrinter的行为非常像’lpd到lpt1：’

Answer 4

如果你在这里使用MSDN示例https://support.microsoft.com/en-us/kb/322091#top但是尝试使用字节数组而不是字符串或文件…这可能救命

 public static void SendBytesToLocalPrinter(byte[] data, string printerName) { var size = Marshal.SizeOf(data[0]) * data.Length; var pBytes = Marshal.AllocHGlobal(size); try { SendBytesToPrinter(printerName, pBytes, size); } finally { Marshal.FreeCoTaskMem(pBytes); } } 

这不会随字节数组编码而改变。 如果您尝试发送一些utf8编码的字节序列，其中混合了一些二进制（即图像）数据，这对我们的团队来说非常有用。