新建一个bmp，随便打一个字符串，打印出来分辨率不清问题。

[lilunlil]

研究了一天C#打印的问题，发现这里面有三个尺寸误点：
以我自定义纸张75cm*50cm为例（实际上就是一个小标签）
①纸张设置时的尺寸
// width:
// 纸张宽度，以百分之一英寸为单位。
//
// height:
// 纸张高度，以百分之一英寸为单位。
那我实际设的尺寸就应该为
(int)(75 * 100 / 25.4 ), (int)(50 * 100 / 25.4 )
②新建Bitmap的尺寸
// 参数:
// width:
// 新 System.Drawing.Bitmap 的宽度（以像素为单位）。
那我实际设的尺寸就应该为
(int)(75 * dpi / 25.4 ), (int)(50 *dpi / 25.4 )
注： dpi可以自行设定

③最后划定区域的大小
e.Graphics.DrawImage((Image)Bmp, destRect, srcRect, System.Drawing.GraphicsUnit.Pixel);
destRect的尺寸我还没搞明白，我估计打印分辨率差与这个就有关系。

        private void button4_Click(object sender, EventArgs e)
        {
            //纸张设置默认
            PaperSize pageSize = new PaperSize("Custom Title size", (int)(75 * 100 / 25.4 + 1), (int)(50 * 100 / 25.4 + 1));//①纸张大小设定：以百分之一英寸为单位。
            pd.DefaultPageSettings.PaperSize = pageSize;

            //打印事件设置
            pd.PrintPage += new PrintPageEventHandler(this.pd_PrintPage3);
            pd.Print();
        }

        private void pd_PrintPage3(object sender, PrintPageEventArgs e)
        {
            Bitmap Bmp = new Bitmap(590, 394);//②毫米换成像素：75*200/25.4=590，50*200/25.4=394
            Bmp.SetResolution(200, 200);
            Graphics g = Graphics.FromImage(Bmp);

            Font Ft = new Font("宋体", 12, FontStyle.Regular);
            Brush Bs = new SolidBrush(Color.Black);
            g.DrawString("字符串测试", Ft, Bs, 29, 197);
            Pen Pn = new Pen(Bs);
            g.DrawLine(Pn, 2, 2, 588, 2);
            g.DrawLine(Pn, 2, 2, 2, 392);
            g.DrawLine(Pn, 2, 392, 588, 392);
            g.DrawLine(Pn, 588, 2, 588, 392);

            //e.Graphics.DrawImage(Bmp,0,0);

            Rectangle destRect = new Rectangle(6, 6, Convert.ToInt32(75 * 96 / 25.4), Convert.ToInt32(50 * 96 / 25.4));//③屏幕分辨率：96
            Rectangle srcRect = new Rectangle(0, 0, Bmp.Width, Bmp.Height);

            e.Graphics.DrawImage((Image)Bmp, destRect, srcRect, System.Drawing.GraphicsUnit.Pixel);//我怀疑问题与这条语句有关
        }

[desperaso]

参考
https://bbs.csdn.net/topics/392512410

                    design_Elements[reportPages_Number].page_TypeFace.Page_Area.Width = (int)Math.Floor(int.Parse(input_def[0].textBox.Text) * 3.779527559055118);
                    design_Elements[reportPages_Number].page_TypeFace.Page_Area.Height = (int)Math.Floor(int.Parse(input_def[1].textBox.Text) * 3.779527559055118) + 13 + 126;
.....................
......................

            g.DrawImage(bmp, dr, sr, GraphicsUnit.Pixel);
.............................
............................
public static string[] page_types = new string[24] {
            "A0","A1","A2","A3","A4","A5","A6","A7",
            "B0","B1","B2","B3","B4","B5","B6","B7",
            "C0","C1","C2","C3","C4","C5","C6","C7"
        };
    public static string[] page_size = new string[24] {
            "841×1189","594×841","420×594","297×420","210×297","148×210","105×148","74×105",
            "1000×1414","707×1000","500×707","353×500","250×353","176×250","125×176","88×125",
            "917×1297","648×917","458×648","324×458","229×324","162×229","114×162","81×114"
        };
    public static string[] page_pixel = new string[24] {
            "3178×4493","2245×3178","1587×2245","1122×1587","793×1122","559×793","396×559","279×396",
            "3779×5344","2672×3779","1889×2672","1334×1889","944×1334","665×944","472×665","332×472",
            "3465×4902","2449×3465","1731×2449","1235×1731","865×1224","612×865","430×612","306×430"
        };

[lilunlil]

引用 1 楼 desperaso 的回复:

参考 https://bbs.csdn.net/topics/392512410

                    design_Elements[reportPages_Number].page_TypeFace.Page_Area.Width = (int)Math.Floor(int.Parse(input_def[0].textBox.Text) * 3.779527559055118);
  

仔细看了你的帖子，发现与我的问题一点相关性都没有...

[desperaso]

引用 2 楼 lilunlil 的回复:

仔细看了你的帖子，发现与我的问题一点相关性都没有...

不喜欢看代码么，代码里面自定义纸张设置，打印文字等都是图像打印输出。
dpi96 像素是乘以3.779527559055118，有换算网站，直接查结果。
显示上，比如A4，实际为210×297，那么显示就是793×1122。
你可以用这个工具，自定义纸张，然后打印看结果。
里面有相应的代码。
不过你这个75cm*50cm，75厘米的那么大的纸张没试过。。快一米了

[橘子皮...]

GraphicsUnit.Pixel ？？？

[assky124]

一般的打印机默认的DPI 300 也有600的，获取下看看，然后设置Image的DPI 你为什么不直接在Graphic上绘图呢。