Question

帮助

我们的应用程序一直使用ProcessStart逻辑打印PDF文档，但现在它已停止工作。

所以我被赋予了寻找替代方案的任务，我认为我有。以下代码适用于我们所有的网络打印机，但是当我将PDF文档发送到本地USB打印机时，它不想打印。

文档位于打印机队列中，用于本地打印机并说打印，但打印机不想打印它。如果我将另一个文档发送到同一台打印机，它将打印新文档（在代码之外，使用记事本），然后PDF打印项目消失。

我已经走遍了网络，我似乎四处走动，但我似乎无法找到一个适合我们问题的答案。

示例堆栈流量修复，不起作用 How to send a raw ZPL to zebra printer using C# via USB

队列的屏幕截图

我正在使用的代码

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);

    private static string  documentName = "HO Document";
    // 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 = documentName;
        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;
    }



    private static void trackPrint(string printerName)
    {
        dlgProgressStatus statusBar = new dlgProgressStatus();


        statusBar.SetDefault("Document Printing Tracking ","", 4);
        statusBar.SetStatus("", false);
        statusBar.Show();
        statusBar.Refresh();

        Stopwatch timeTaken = new Stopwatch();
        timeTaken.Start();
        Utilities.DebugSolution.SetMessageUniqueFile("Printing", "Tracking printing");
        while (!Utilities.Printer.JobOnQueue(printerName, documentName, ref statusBar))
        {
            Utilities.DebugSolution.SetMessageUniqueFile("Printing", "Waiting for Job on Queue");
            System.Threading.Thread.Sleep(100);
            if (timeTaken.Elapsed.Minutes > 1)
            {
                MessageBox.Show(LanguageHelper.GetString("dlgPDFViewer.PrintingQueueTimeOut"), "Health Options®", MessageBoxButtons.OK, MessageBoxIcon.Error);
                break;
            }
        }

        statusBar.Close();
        statusBar.Dispose();



    }

    public static bool SendFileToPrinter(string szPrinterName, string szFileName, string printingDocumentName)
    {
        Utilities.DebugSolution.SetMessageUniqueFile("Printing", "Sending to Printer");
        Utilities.DebugSolution.SetMessageUniqueFile("Printing", "File path: " + szFileName);
        Utilities.DebugSolution.SetMessageUniqueFile("Printing", "Exisits: " + File.Exists(szFileName).ToString());
        Utilities.DebugSolution.SetMessageUniqueFile("Printing", "Printer Name: " + szPrinterName);
        if (!String.IsNullOrEmpty(printingDocumentName))
            documentName = printingDocumentName;

        // Open the file.
        using (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);


            trackPrint(szPrinterName);
            //Remove temp file      
            System.GC.Collect();
            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.
        SendBytesToPrinter(szPrinterName, pBytes, dwCount);
        Marshal.FreeCoTaskMem(pBytes);
        return true;
    }

使用C＃打印PDF

0 个答案: