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希望这里有人可以帮助我,因为我正用头撞墙试图让它发挥作用。基本上我需要使用winspool.Drv win32 API 将原始文本/PCL 命令发送到打印机进行打印。这可以正常工作,但是,您在打印机对话框/首选项中选择的任何打印机选项都不会做任何事情。

最终,我想从 PrinterSettings 对话框中获取 DEVMODE,并将其用于原始打印,但我什至无法手动设置它。

我曾尝试在 WritePrinter 之前或在单独的打开/关闭打印机之前更改 DEVMODE,我尝试仅使用 DocumentProperties 调用,并使用带有 PRINTER_INFO_8 结构的 GetPrinter/SetPrinter,没有任何问题。DEVMODE 结构似乎填写正确,我更改它,它似乎更改正确,但无论如何打印机总是以相同的方式打印。

这是我一直在使用的代码:

方法1:

public static bool SetPrinterSettings(PrinterSettings settings, IntPtr hPrinter)
{
    IntPtr hDevMode; // a handle to our current DEVMODE
    IntPtr pDevMode; // a pointer to our current DEVMODE
    String sPrinterName; // normalized printer name
    DEVMODE dm;

    // Setup
    sPrinterName = settings.PrinterName.Normalize();

    // Obtain the current DEVMODE from the PrinterSettings
    hDevMode = settings.GetHdevmode(settings.DefaultPageSettings);

    // Obtain a lock on the handle and get an actual pointer so Windows won't move
    // it around while we're futzing with it
    pDevMode = GlobalLock(hDevMode);

    // test
    dm = (DEVMODE)Marshal.PtrToStructure(pDevMode, typeof(DEVMODE));

    // Our DEVMODE is 188 bytes, but dmSize returns 220, does this matter?
    // This code doesnt seem to work
    //dm.dmSize = (short)Marshal.SizeOf(dm); // Set size to our implementation of DevMode
    //int isize = GlobalSize(pDevMode).ToInt32() - (int)dm.dmSize; // Set the print drivers extra size
    //dm.dmDriverExtra = Convert.ToInt16(isize);

    // Change things
    dm.dmFields = DM_FIELD_TYPE.DM_ORIENTATION;
    dm.dmOrientation = 2;

    // Load the structure back into the buffer
    Marshal.StructureToPtr(dm, pDevMode, true);

    //Tell the printer about the new property
    int ret = DocumentProperties(IntPtr.Zero, hPrinter, sPrinterName, pDevMode, pDevMode, (DM_IN_BUFFER | DM_OUT_BUFFER));

    if (ret <= 0)
    {
        return false;
    }



    // We're done futzing
    GlobalUnlock(hDevMode);

    // Tell our printer settings to use the one we just overwrote
    //settings.SetHdevmode(hDevMode);

    // It's copied to our printer settings, so we can free the OS-level one
    GlobalFree(hDevMode);

    //test
    dm = (DEVMODE)Marshal.PtrToStructure(pDevMode, typeof(DEVMODE));

    // ^^ this contains correct orientation

    return true;
}

方法2:

public static bool SetLandscapeMode(PrinterSettings settings, IntPtr hPrinter)
{
    // Setup
    String sPrinterName = settings.PrinterName.Normalize();

    // get current printer settings
    int memNeeded = DocumentProperties(IntPtr.Zero, hPrinter, sPrinterName, IntPtr.Zero, IntPtr.Zero, 0);
    IntPtr pFullDevMode = Marshal.AllocHGlobal(memNeeded);
    DocumentProperties(IntPtr.Zero, hPrinter, sPrinterName, pFullDevMode, IntPtr.Zero, DM_OUT_BUFFER);

    DEVMODE dm = (DEVMODE)Marshal.PtrToStructure(pFullDevMode, typeof(DEVMODE));

    // change the settings
    dm.dmFields = DM_FIELD_TYPE.DM_ORIENTATION;
    dm.dmOrientation = 2;

    Marshal.StructureToPtr(dm, pFullDevMode, true);

    PRINTER_INFO_8 PI8 = new PRINTER_INFO_8();
    PI8.pDevMode = pFullDevMode;

    IntPtr pPI8 = Marshal.AllocHGlobal(Marshal.SizeOf(PI8));

    Marshal.StructureToPtr(PI8, pPI8, true);

    // save the printer settings
    SetPrinter(hPrinter, 9, pPI8, 0);

    Marshal.FreeHGlobal(pPI8);

    return true;
}

测试打印的代码:

private void testPrint_Click(object sender, EventArgs e)
{
    IntPtr hPrinter;

    if (printDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
    {
        hPrinter = RawPrint.OpenRAWPrinter(printDialog1.PrinterSettings.PrinterName);

        if (hPrinter == IntPtr.Zero)
        {
            MessageBox.Show("Error opening printer");
            return;
        }

        if (!RawPrint.StartRAWDocument(hPrinter, "Test document"))
        {
            MessageBox.Show("Error starting raw document");
            RawPrint.CloseRAWPrinter(hPrinter);
            return;
        }

        // Start a page.
        if (RawPrint.StartRawPage(hPrinter))
        {
            // Set the printers settings
            //if (!RawPrint.SetPrinterSettings(printDialog1.PrinterSettings, hPrinter))
            if(!RawPrint.SetLandscapeMode(printDialog1.PrinterSettings, hPrinter))
            {
                MessageBox.Show("Error setting printer settings");
                RawPrint.CloseRAWPrinter(hPrinter);
                return;
            }

            String test = "This is \r\n test print data";
            byte[] buf = Encoding.Default.GetBytes(test);

            GCHandle gch = GCHandle.Alloc(buf, GCHandleType.Pinned);
            RawPrint.writeRAW(hPrinter, gch.AddrOfPinnedObject(), buf.Length);
            gch.Free();

            RawPrint.EndRawPage(hPrinter);
        }

        RawPrint.EndRAWDocument(hPrinter);
        RawPrint.CloseRAWPrinter(hPrinter);
    }
    else
    {
        MessageBox.Show("Error starting raw page");
    }
}

唯一奇怪的是 Marshal.SizeOf(typeof(DEVMODE)) 或 Marshal.SizeOf(dm) 等于 188,而返回到结构中的 dmSize 是 220。我尝试修改这个 dmSize 以匹配我们的结构,如注释中所示输出代码,但这似乎出错或不起作用,不确定这是否重要。

除此之外,在 DevModes 中返回的信息似乎都是正确且有效的。我可以在打印对话框中设置选项,并在 PrinterSettings 开发模式中查看它们的更改。在这些函数结束时,将 pDevMode 编组回结构具有更改的设置。

然而,这一切似乎对印刷品没有任何影响。我有什么遗漏吗?

编辑:测试函数中的 RawPrint 调用只是围绕 spooler api 调用的包装器。该页面打印良好,它总是以纵向模式打印,并且没有任何选项有效。

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1 回答 1

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与其使用 WritePrinter 绕过打印机驱动程序,不如正常启动打印作业并使用 ExtEscape() 和PASSTHROUGH转义注入 PCL。这将允许所有 PrinterSettings 值应用于作业。并非所有打印机驱动程序都支持 PASSTHROUGH,但您可以通过使用QUERYESCSUPPORT调用 ExtEscape() 来检查驱动程序支持。

于 2013-03-18T19:59:32.290 回答