打印原始数据时缩放文档

Question

我正在尝试直接在支持 postscript 的打印机上打印 pdf 文件。不幸的是，打印的文档被缩放了（比 adobe reader 的打印文件小一点，使用缩放模式 - "Actual size"）。有什么办法可以不缩放打印出来吗？这是我用来打印的代码：

  [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Interoperability", "CA1401:PInvokesShouldNotBeVisible"), DllImport("winspool.Drv", EntryPoint = "OpenPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall, ThrowOnUnmappableChar = true, BestFitMapping = false)]
    public static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPStr)] string szPrinter, out IntPtr hPrinter, IntPtr pd);

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Interoperability", "CA1401:PInvokesShouldNotBeVisible"), DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
    public static extern bool ClosePrinter(IntPtr hPrinter);

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Interoperability", "CA1401:PInvokesShouldNotBeVisible"), DllImport("winspool.Drv", EntryPoint = "StartDocPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall, ThrowOnUnmappableChar = true, BestFitMapping = false)]
    public static extern bool StartDocPrinter(IntPtr hPrinter, Int32 level, [In, MarshalAs(UnmanagedType.LPStruct)] DOCINFOA di);

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Interoperability", "CA1401:PInvokesShouldNotBeVisible"), DllImport("winspool.Drv", EntryPoint = "EndDocPrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
    public static extern bool EndDocPrinter(IntPtr hPrinter);

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Interoperability", "CA1401:PInvokesShouldNotBeVisible"), DllImport("winspool.Drv", EntryPoint = "StartPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
    public static extern bool StartPagePrinter(IntPtr hPrinter);

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Interoperability", "CA1401:PInvokesShouldNotBeVisible"), DllImport("winspool.Drv", EntryPoint = "EndPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
    public static extern bool EndPagePrinter(IntPtr hPrinter);

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Interoperability", "CA1401:PInvokesShouldNotBeVisible"), 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);


    public static bool SendFileToPrinter(string pdfFileName, string printerName, string name)
    {
        try
        {
            bool success = false;
            using (FileStream fs = new FileStream(pdfFileName, FileMode.Open))
            {
                int nLength = Convert.ToInt32(fs.Length);

                BinaryReader br = new BinaryReader(fs);

                Byte[] bytes = new Byte[fs.Length];
                bytes = br.ReadBytes(nLength);

                IntPtr ptrUnmanagedBytes = new IntPtr(0);
                ptrUnmanagedBytes = Marshal.AllocCoTaskMem(nLength);

                Marshal.Copy(bytes, 0, ptrUnmanagedBytes, nLength);

                success = SendBytesToPrinter(printerName, ptrUnmanagedBytes, nLength, name);

                Marshal.FreeCoTaskMem(ptrUnmanagedBytes);
            }
            return success;
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
    }


    private static bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes, Int32 dwCount, string name)
    {
        try
        {
            Int32 dwError = 0, dwWritten = 0;
            IntPtr hPrinter = new IntPtr(0);
            DOCINFOA di = new DOCINFOA();
            bool success = false; // Assume failure unless you specifically succeed.

            di.pDocName = name;
            di.pDataType = "RAW";

            if (OpenPrinter(szPrinterName.Normalize(), out hPrinter, IntPtr.Zero))
            {
                if (StartDocPrinter(hPrinter, 1, di))
                {
                    if (StartPagePrinter(hPrinter))
                    {
                        success = WritePrinter(hPrinter, pBytes, dwCount, out dwWritten);
                        EndPagePrinter(hPrinter);
                    }
                    EndDocPrinter(hPrinter);
                }
                ClosePrinter(hPrinter);
            }

            if (success == false)
            {
                dwError = Marshal.GetLastWin32Error();
            }
            return success;
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
    }

顺便问一下 - 当我这样打印时，我可以管理打印机边距吗？

谢谢，巴尔托斯

Answer 1

PDF 和 PostScript 不是一回事！仅仅因为您的打印机 'supports PostScript' 并不意味着它可以打印 PDF 文件。

在这种情况下，您的打印机看起来确实支持 PDF 打印。 spring 考虑缩放输出有两个可能的原因：

1) PDF 文件的介质尺寸与打印机中的介质不匹配。

2) 打印机有无法打印的边距。为了确保打印整个 PDF 文件（如果它包含一直到媒体边缘的绘图操作），打印机会缩放 PDF，以便 PDF 媒体适合打印媒体的可打印区域。

您可以根据打印机中的介质检查 PDF 页面的介质尺寸。如果它们匹配，那么您就知道不是那样。

解决方案几乎完全取决于打印机的功能。您可能可以告诉它不要缩放输出（如果您确定 PDF 的标记区域适合打印页面的可打印区域）。如果不是，那么您唯一的解决方案是使用较小的媒体重新制作 PDF 文件。

您也可以尝试在 PDF 文件中设置一个比打印媒体小的 CropBox，然后看看您的打印机是否会打印未缩放的 PDF。

Answer 2

感谢@KenS 的建议，终于我找到了 PDF 无法正确打印的解决方案。默认 PDF 缩放存在问题，它试图使打印适合页面。解决方案是设置缩放比例：

/ViewerPreferences<</PrintScaling/None>>

在 PDF 文件中，例如：

之前的对象：

2 0 obj
<<
/Type/Catalog
/Pages 3
>>
endobj

之后的对象：

2 0 obj
<<
/Type/Catalog
/ViewerPreferences<</PrintScaling/None>>
/Pages 3
>>
endobj

打印原始数据时缩放文档

Document scaled when printing raw data

c#

printing

wmi

postscript