c＃RawPrinterHelper将数据发送到打印机，打印机假脱机和状态“打印”但实际上没有打印

我正在使用RawPrinterHelper类，如下所述： https ： //support.microsoft.com/en-us/help/322091/how-to-send-raw-data-to-a-printer-by-using-visual- c-.net

我正在使用完全按照示例的代码，它似乎立即工作没有错误 – 除了它没有实际打印。

检查打印队列显示打印作业出现，并立即消失。 如果我更改属性以保留旧打印件，我可以看到它将作业分类为“已打印”。 然而实际上没有印刷过！

我尝试使用Notepad，Word和Excel直接打印到打印机，所有这些都是成功的。 我尝试了3种不同的打印机，甚至在不同的打印机上使用不同的打印机重新完成了工作，但仍然存在同样的问题。

我正在使用Windows 10专业版和VS2017。

任何建议将不胜感激。

private void button1_Click(object sender, EventArgs e) { //Allow the user to select a file. OpenFileDialog ofd = new OpenFileDialog(); if (DialogResult.OK == ofd.ShowDialog(this)) { // Allow the user to select a printer. PrintDialog pd = new PrintDialog(); pd.PrinterSettings = new PrinterSettings(); if (DialogResult.OK == pd.ShowDialog(this)) { // Print the file to the printer. RawPrinterHelper.SendFileToPrinter(pd.PrinterSettings.PrinterName, ofd.FileName); } } //other tests - these both return True and the job appears in print queue as "printed" // label1.Text = RawPrinterHelper.SendFileToPrinter("Citizen CL-S521", @"C:\Development\Code\myText.txt").ToString(); //label2.Text = RawPrinterHelper.SendStringToPrinter("Citizen CL-S521F", "Test string").ToString(); } public class RawPrinterHelper { // Structure and API declarions: [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] 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.Unicode, 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.Unicode, 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 = "RAW Document"; // Win7 di.pDataType = "RAW"; // Win8+ // di.pDataType = "XPS_PASS"; // 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); fs.Close(); fs.Dispose(); fs = null; 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; } }