如何测量要打印的字符串?

本文关键字：打印字符串何测量测量 | 更新日期: 2023-09-27 18:14:48

我必须测量字符串以确定确切的长度，以便我可以创建标签并设置报告上的以下信息以正确打印出来。

我看到很多关于用图形测量字符串的帖子。MeasureString但是当我使用这些时，我不能得到打印输出的精确毫米。

这里是我的代码:

public double getStingWith_mm(string InputText, string Fontname, bool TypeBold, bool TypeItalic, double Fontsize)
{
    try
    {
        if (grU == null)
        {
            //grU = CreateGraphics();
            //grU = Graphics.FromImage(new Bitmap(1, 1));
            System.Drawing.Printing.PrintDocument PD = new System.Drawing.Printing.PrintDocument();
            grU = PD.PrinterSettings.CreateMeasurementGraphics();
        }
        FontStyle fStyle = FontStyle.Regular;
        try
        {
            if (TypeBold)
                fStyle = FontStyle.Bold;
            if (TypeItalic)
                fStyle = FontStyle.Italic;
        }
        catch (Exception ex)
        {
            logger4net.Error("some error during creating of the fonts.", ex);
        }
        try
        {
            currentFont = new System.Drawing.Font(
                    new FontFamily(Fontname),
                   (int)Math.Ceiling(Fontsize),  //next higher size!
                   fStyle,
                   GraphicsUnit.Millimeter);
        }
        catch (Exception ex)
        {
            logger4net.Error("some error during creating of the fonts " + Fontname, ex);
            try
            {
                currentFont = new System.Drawing.Font(
                        new FontFamily("Arial"),
                       (int)Math.Ceiling(Fontsize),  //next higher size!
                       fStyle,
                       GraphicsUnit.Millimeter);
            }
            catch (Exception ex2)
            {
                logger4net.Error("some error during creating of the fonts: we fall back to Arial!!", ex);
            }
        }
        // Change the page scale.  
        grU.PageUnit = GraphicsUnit.Millimeter;
        grU.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
        SizeF size = grU.MeasureString(InputText, currentFont); //string format (zusatzparameter) , 495)                
        //SizeF result2 = grU.MeasureString(InputText, currentFont, int.MaxValue, StringFormat.GenericTypographic);
        SizeF result2 = grU.MeasureString(InputText, currentFont, new PointF(0, 0), new StringFormat(StringFormatFlags.MeasureTrailingSpaces));
        SizeF result3 = grU.MeasureString(InputText, currentFont, int.MaxValue, StringFormat.GenericTypographic);
        int resultInt = MeasureDisplayStringWidth(grU, InputText, currentFont);
        //return Math.Ceiling(size.Width);
        return Math.Ceiling(result2.Width);

    }
    catch (Exception ex)
    {
        logger4net.Error(ex);
        return 0;
    }
    return 0;
}
static public int MeasureDisplayStringWidth(Graphics graphics, string text, System.Drawing.Font font)
    {
        System.Drawing.StringFormat format = new System.Drawing.StringFormat();
        System.Drawing.RectangleF rect = new System.Drawing.RectangleF(0, 0, 1000, 1000);
        CharacterRange ranges = new System.Drawing.CharacterRange(0, text.Length);
        List<CharacterRange> RangesArray = new List<CharacterRange>();
        RangesArray.Add(ranges);
        System.Drawing.Region[] regions = new System.Drawing.Region[1];
        format.SetMeasurableCharacterRanges(RangesArray.ToArray());
        regions = graphics.MeasureCharacterRanges(text, font, rect, format);
        rect = regions[0].GetBounds(graphics);
        return (int)(rect.Right + 1.0f);
    }

在函数getStingWith_mm中，我得到了更多的结果值来检查我的一种方法是否可以达到正确的值!

现在，如果我开始这个函数的文本"test"，字体Arial 12，粗体。我得到的返回值在21到25毫米之间，但在打印输出上它大约是10毫米我不承认我的错误。stackoverflow上的所有其他示例都与MeasureString一起工作，它应该工作…