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使用 PrintDocument 打印圖像。 如何調整圖像以適合紙張大小

[英]Printing image with PrintDocument. how to adjust the image to fit paper size

在 C# 中,我嘗試使用 PrintDocument 類和以下代碼打印圖像。 圖像大小為 1200 px 寬和 1800 px 高。 我正在嘗試使用小型 zeebra 打印機在 4*6 紙上打印此圖像。 但該程序僅打印 4*6 的大圖像。 這意味着它沒有將圖像調整為紙張尺寸!

     PrintDocument pd = new PrintDocument();
     pd.PrintPage += (sender, args) =>
     {
           Image i = Image.FromFile("C://tesimage.PNG");
           Point p = new Point(100, 100);
           args.Graphics.DrawImage(i, 10, 10, i.Width, i.Height);
     };
     pd.Print();

當我使用 Window Print 打印相同的圖像時(右鍵單擊並選擇打印,它會自動縮放到紙張大小並正確打印。這意味着所有內容都是 4*6 紙張。)我如何在我的 C# 程序中執行相同的操作?

您傳遞給 DrawImage 方法的參數應該是您想要在紙上圖像的大小而不是圖像本身的大小,然后 DrawImage 命令將為您處理縮放。 可能最簡單的方法是使用 DrawImage 命令的以下覆蓋。

args.Graphics.DrawImage(i, args.MarginBounds);

注意:如果圖像的比例與矩形不同,這將使圖像傾斜。 對圖像大小和紙張大小進行一些簡單的數學運算,您可以創建一個適合紙張邊界的新矩形,而不會使圖像傾斜。

不要踐踏 BBoy 已經不錯的答案,但我已經完成了保持縱橫比的代碼。 我接受了他的建議,所以他應該在這里得到部分信任!

PrintDocument pd = new PrintDocument();
pd.DefaultPageSettings.PrinterSettings.PrinterName = "Printer Name";
pd.DefaultPageSettings.Landscape = true; //or false!
pd.PrintPage += (sender, args) =>
{
    Image i = Image.FromFile(@"C:\...\...\image.jpg");
    Rectangle m = args.MarginBounds;

    if ((double)i.Width / (double)i.Height > (double)m.Width / (double)m.Height) // image is wider
    {
        m.Height = (int)((double)i.Height / (double)i.Width * (double)m.Width);
    }
    else
    {
        m.Width = (int)((double)i.Width / (double)i.Height * (double)m.Height);
    }
    args.Graphics.DrawImage(i, m);
};
pd.Print();

BBoy 提供的解決方案工作正常。 但就我而言,我不得不使用

e.Graphics.DrawImage(memoryImage, e.PageBounds);

這將僅打印表單。 當我使用 MarginBounds 時,即使表單小於監視器屏幕,它也會打印整個屏幕。 PageBounds 解決了這個問題。 感謝 BBoy!

你可以在這里使用我的代碼

//Print Button Event Handeler
private void btnPrint_Click(object sender, EventArgs e)
{
    PrintDocument pd = new PrintDocument();
    pd.PrintPage += PrintPage;
    //here to select the printer attached to user PC
    PrintDialog printDialog1 = new PrintDialog();
    printDialog1.Document = pd;
    DialogResult result = printDialog1.ShowDialog();
    if (result == DialogResult.OK)
    {
        pd.Print();//this will trigger the Print Event handeler PrintPage
    }
}

//The Print Event handeler
private void PrintPage(object o, PrintPageEventArgs e)
{
    try
    {
        if (File.Exists(this.ImagePath))
        {
            //Load the image from the file
            System.Drawing.Image img = System.Drawing.Image.FromFile(@"C:\myimage.jpg");

            //Adjust the size of the image to the page to print the full image without loosing any part of it
            Rectangle m = e.MarginBounds;

            if ((double)img.Width / (double)img.Height > (double)m.Width / (double)m.Height) // image is wider
            {
                m.Height = (int)((double)img.Height / (double)img.Width * (double)m.Width);
            }
            else
            {
                m.Width = (int)((double)img.Width / (double)img.Height * (double)m.Height);
            }
            e.Graphics.DrawImage(img, m);
        }
    }
    catch (Exception)
    {

    }
}

回答:

public void Print(string FileName)
{
    StringBuilder logMessage = new StringBuilder();
    logMessage.AppendLine(string.Format(CultureInfo.InvariantCulture, "-------------------[ START - {0} - {1} -------------------]", MethodBase.GetCurrentMethod(), DateTime.Now.ToShortDateString()));
    logMessage.AppendLine(string.Format(CultureInfo.InvariantCulture, "Parameter: 1: [Name - {0}, Value - {1}", "None]", Convert.ToString("")));

    try
    {
        if (string.IsNullOrWhiteSpace(FileName)) return; // Prevents execution of below statements if filename is not selected.

        PrintDocument pd = new PrintDocument();

        //Disable the printing document pop-up dialog shown during printing.
        PrintController printController = new StandardPrintController();
        pd.PrintController = printController;

        //For testing only: Hardcoded set paper size to particular paper.
        //pd.PrinterSettings.DefaultPageSettings.PaperSize = new PaperSize("Custom 6x4", 720, 478);
        //pd.DefaultPageSettings.PaperSize = new PaperSize("Custom 6x4", 720, 478);

        pd.DefaultPageSettings.Margins = new Margins(0, 0, 0, 0);
        pd.PrinterSettings.DefaultPageSettings.Margins = new Margins(0, 0, 0, 0);

        pd.PrintPage += (sndr, args) =>
        {
            System.Drawing.Image i = System.Drawing.Image.FromFile(FileName);

            //Adjust the size of the image to the page to print the full image without loosing any part of the image.
            System.Drawing.Rectangle m = args.MarginBounds;

            //Logic below maintains Aspect Ratio.
            if ((double)i.Width / (double)i.Height > (double)m.Width / (double)m.Height) // image is wider
            {
                m.Height = (int)((double)i.Height / (double)i.Width * (double)m.Width);
            }
            else
            {
                m.Width = (int)((double)i.Width / (double)i.Height * (double)m.Height);
            }
            //Calculating optimal orientation.
            pd.DefaultPageSettings.Landscape = m.Width > m.Height;
            //Putting image in center of page.
            m.Y = (int)((((System.Drawing.Printing.PrintDocument)(sndr)).DefaultPageSettings.PaperSize.Height - m.Height) / 2);
            m.X = (int)((((System.Drawing.Printing.PrintDocument)(sndr)).DefaultPageSettings.PaperSize.Width - m.Width) / 2);
            args.Graphics.DrawImage(i, m);
        };
        pd.Print();
    }
    catch (Exception ex)
    {
        log.ErrorFormat("Error : {0}\n By : {1}-{2}", ex.ToString(), this.GetType(), MethodBase.GetCurrentMethod().Name);
    }
    finally
    {
        logMessage.AppendLine(string.Format(CultureInfo.InvariantCulture, "-------------------[ END  - {0} - {1} -------------------]", MethodBase.GetCurrentMethod().Name, DateTime.Now.ToShortDateString()));
        log.Info(logMessage.ToString());
    }
}

同意 TonyM 和 BBoy - 這是原始 4*6 打印標簽的正確答案。 (args.PageBounds)。 這對我打印 Endicia API 服務運輸標簽有用。

private void SubmitResponseToPrinter(ILabelRequestResponse response)
    {
        PrintDocument pd = new PrintDocument();
        pd.PrintPage += (sender, args) =>
        {
            Image i = Image.FromFile(response.Labels[0].FullPathFileName.Trim());
            args.Graphics.DrawImage(i, args.PageBounds);
        };
        pd.Print();
    }

所有這些答案都有問題,即總是將圖像拉伸到頁面大小並在嘗試此操作時切斷一些內容。
找到了一個更簡單的方法。

我自己的解決方案只拉伸(這是正確的詞嗎?)如果圖像太大,可以使用多個副本和頁面方向。

                PrintDialog dlg = new PrintDialog();

            if (dlg.ShowDialog() == true)
            {
                BitmapImage bmi = new BitmapImage(new Uri(strPath));

                Image img = new Image();
                img.Source = bmi;

                if (bmi.PixelWidth < dlg.PrintableAreaWidth ||
                           bmi.PixelHeight < dlg.PrintableAreaHeight)
                {
                    img.Stretch = Stretch.None;
                    img.Width = bmi.PixelWidth;
                    img.Height = bmi.PixelHeight;
                }


                if (dlg.PrintTicket.PageBorderless == PageBorderless.Borderless)
                {
                    img.Margin = new Thickness(0);
                }
                else
                {
                    img.Margin = new Thickness(48);
                }
                img.VerticalAlignment = VerticalAlignment.Top;
                img.HorizontalAlignment = HorizontalAlignment.Left;

                for (int i = 0; i < dlg.PrintTicket.CopyCount; i++)
                {
                    dlg.PrintVisual(img, "Print a Image");
                }
            }

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