使用 PrintDocument 将图像无边距打印到打印机

Question

我正在尝试使用 PrintDocument 对象将图像打印到打印机，但图像总是在右侧被切掉一点。

private PrintDocument _printDocument;
public void PrintCurrentPage()
{
    _printPage = 1;

    if (_printDocument != null)
    {
        try
        {
            _printDocument.Print();
        }
        catch
        {
        }
    }
}

private void PrintDocument_PrintPage(object sender, PrintPageEventArgs e)
{
    int savePage = iv.Image.Page;
    try
    {
        iv.Image.Page = _printPage;
        _printPage++;

        using (Image img = RasterImageConverter.ConvertToImage(iv.Image, ConvertToImageOptions.None))
        {
            if (LeadToolsHelper.CanRunPrintPreview)
            {
                e.Graphics.DrawImage(img, 0, 0);
            }
        }

        e.HasMorePages = _printPage <= iv.Image.PageCount;
        if (_printPage > iv.Image.PageCount)
            _printPage = 1;
    }
    finally
    {
        iv.Image.Page = savePage;
    }
}

我怀疑（但不是100%确定）这与利润率有关。我尝试添加以下内容但没有成功。

_printDocument.DefaultPageSettings.Margins.Top = 0;
_printDocument.DefaultPageSettings.Margins.Bottom = 0;
_printDocument.DefaultPageSettings.Margins.Left = 0;
_printDocument.DefaultPageSettings.Margins.Right = 0;

_printDocument.DefaultPageSettings.PrinterSettings.DefaultPageSettings.Margins.Top = 0;
_printDocument.DefaultPageSettings.PrinterSettings.DefaultPageSettings.Margins.Bottom = 0;
_printDocument.DefaultPageSettings.PrinterSettings.DefaultPageSettings.Margins.Left = 0;
_printDocument.DefaultPageSettings.PrinterSettings.DefaultPageSettings.Margins.Right = 0;

有什么想法可以让打印出来的内容适合页面/纸张尺寸而不是纸张打印吗？

Answer 1

我在 Microsoft 网站上找到了更多信息，最终得出以下内容来解决我的问题。它效果很好，图像现在完美地在页面边界内居中。

public class MyFancyPrintClass: UserControl
{
    private PrintDocument _printDocument;
    private PrintAction printAction = PrintAction.PrintToPrinter;
    private int _printPage;
    
    
    // Constructor
    public MyFancyPrintClass()
    {
        InitializeComponent();

        // Check if there is printer installed
        try
        {
            if (PrinterSettings.InstalledPrinters != null && PrinterSettings.InstalledPrinters.Count > 0)
            {
                _printDocument = new PrintDocument();
                _printDocument.PrintPage += new PrintPageEventHandler(PrintDocument_PrintPage);
                _printDocument.BeginPrint += new PrintEventHandler(PrintDocument_BeginPrint);
            }
            else
                _printDocument = null;
        }
        catch (Exception)
        {
            _printDocument = null;
        }
    }
    
    
    // Methods
    public void PrintCurrentPage()
    {
        _printPage = 1;

        if (_printDocument != null)
        {
            try
            {
                if (_printDocument.PrinterSettings.CanDuplex)
                    _printDocument.PrinterSettings.Duplex = Duplex.Vertical;

                _printDocument.Print();
            }
            catch
            {
            }
        }
    }
    
    
    // Printer events
    private void PrintDocument_BeginPrint(object sender, PrintEventArgs e)
    {
        // Save our print action so we know if we are printing 
        // a preview or a real document.
        printAction = e.PrintAction;

        // Set some preferences, our method should print a box with any 
        // combination of these properties being true/false.
        _printDocument.OriginAtMargins = false;   //true = soft margins, false = hard margins
        _printDocument.DefaultPageSettings.Landscape = false;
    }

    private void PrintDocument_PrintPage(object sender, PrintPageEventArgs e)
    {
        // The "iv" object is an object I have that contains my Image.  Change it to your control's name.
        
        int savePage = iv.Image.Page;

        try
        {
            iv.Image.Page = _printPage;
            _printPage++;

            Graphics g = e.Graphics;
            RectangleF marginBounds = e.MarginBounds;
            RectangleF printableArea = e.PageSettings.PrintableArea;

            if (printAction == PrintAction.PrintToPreview)
                g.TranslateTransform(printableArea.X, printableArea.Y);

            int availableWidth = (int)Math.Floor(_printDocument.OriginAtMargins
                ? marginBounds.Width
                : (e.PageSettings.Landscape
                ? printableArea.Height
                : printableArea.Width));

            int availableHeight = (int)Math.Floor(_printDocument.OriginAtMargins
                ? marginBounds.Height
                : (e.PageSettings.Landscape
                ? printableArea.Width
                : printableArea.Height));

            using (Image img = RasterImageConverter.ConvertToImage(iv.Image, ConvertToImageOptions.None))
            {
                //g.DrawRectangle(Pens.Red, 0, 0, availableWidth - 1, availableHeight - 1);
                g.DrawImage(img, 0, 0, availableWidth - 1, availableHeight - 1);
            }

            e.HasMorePages = _printPage <= iv.Image.PageCount;
            if (_printPage > iv.Image.PageCount)
                _printPage = 1;
        }
        finally
        {
            // Go to the next page if there is one
            iv.Image.Page = savePage;
        }
    }
}