C# 打印必备

柔情只为你懂 2024-02-19 17:03 32阅读 0赞

1.打印纸张设置、像素转毫米、像素转英寸、毫米转英寸

2.像素转换是使用的 DPI 获取方式，这里提供三种方法

3.下面有两个文件，一个 form 窗体文件，一个是转换的公共方法类

![1363322907_8124.gif][]

![1363322915_5281.gif][]

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using System;  
using System.Drawing;  
using System.Drawing.Printing;  
using System.Runtime.InteropServices;  
using System.Windows.Forms;  
  
  
namespace PrintOrder.ExpressPrinter  
\{  
public partial class FrmTest : Form  
\{  
public FrmTest()  
\{  
InitializeComponent();  
//使用窗体获取DPI  
m\_dpiX = this.CreateGraphics().DpiX;  
m\_dpiY = this.CreateGraphics().DpiY;  
//使用系统API获取DPI  
SetProcessDPIAware(); //重要  
IntPtr screenDC = GetDC(IntPtr.Zero);  
int dpi\_x = GetDeviceCaps(screenDC, LOGPIXELSX);  
int dpi\_y = GetDeviceCaps(screenDC, LOGPIXELSY);  
ReleaseDC(IntPtr.Zero, screenDC);  
//使用GDI+ 绘图图面 获取DPI  
float imgX, imgY = 0;  
Bitmap map = new Bitmap(100, 100);  
using (Graphics g = Graphics.FromImage(map))  
\{  
imgX = g.DpiX;  
imgY = g.DpiY;  
\}  
//显示三种DPI  
this.textBox1.Text = string.Format("窗口DPI:x=\{0\},y=\{1\}; 系统DPI：x=\{2\},y=\{3\}; 图片DPI:x=\{4\},y=\{5\}"  
, m\_dpiX  
, m\_dpiY  
, dpi\_x  
, dpi\_y  
, imgX  
, imgY);  
\}  
  
  
float m\_dpiX = 0;  
float m\_dpiY = 0;  
\#region 获取系统DPI  
  
\[DllImport("user32.dll")\]  
static extern IntPtr GetDC(IntPtr ptr);  
  
  
\[DllImport("user32.dll", EntryPoint = "ReleaseDC")\]  
public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDc);  
  
  
\[DllImport("gdi32.dll")\]  
public static extern IntPtr CreateDC(  
string lpszDriver, // driver name  
string lpszDevice, // device name  
string lpszOutput, // not used; should be NULL  
Int64 lpInitData // optional printer data  
);  
  
  
\[DllImport("gdi32.dll")\]  
public static extern int GetDeviceCaps(  
IntPtr hdc, // handle to DC  
int nIndex // index of capability  
);  
  
  
\[DllImport("user32.dll")\]  
internal static extern bool SetProcessDPIAware();  
  
  
//const int DRIVERVERSION = 0;  
//const int TECHNOLOGY = 2;  
//const int HORZSIZE = 4;  
//const int VERTSIZE = 6;  
//const int HORZRES = 8;  
//const int VERTRES = 10;  
//const int BITSPIXEL = 12;  
//const int PLANES = 14;  
//const int NUMBRUSHES = 16;  
//const int NUMPENS = 18;  
//const int NUMMARKERS = 20;  
//const int NUMFONTS = 22;  
//const int NUMCOLORS = 24;  
//const int PDEVICESIZE = 26;  
//const int CURVECAPS = 28;  
//const int LINECAPS = 30;  
//const int POLYGONALCAPS = 32;  
//const int TEXTCAPS = 34;  
//const int CLIPCAPS = 36;  
//const int RASTERCAPS = 38;  
//const int ASPECTX = 40;  
//const int ASPECTY = 42;  
//const int ASPECTXY = 44;  
//const int SHADEBLENDCAPS = 45;  
const int LOGPIXELSX = 88;  
const int LOGPIXELSY = 90;  
//const int SIZEPALETTE = 104;  
//const int NUMRESERVED = 106;  
//const int COLORRES = 108;  
//const int PHYSICALWIDTH = 110;  
//const int PHYSICALHEIGHT = 111;  
//const int PHYSICALOFFSETX = 112;  
//const int PHYSICALOFFSETY = 113;  
//const int SCALINGFACTORX = 114;  
//const int SCALINGFACTORY = 115;  
//const int VREFRESH = 116;  
//const int DESKTOPVERTRES = 117;  
//const int DESKTOPHORZRES = 118;  
//const int BLTALIGNMENT = 119;  
  
  
\#endregion  
  
  
\#region 打印功能  
private void FrmTest\_Load(object sender, EventArgs e)  
\{  
m\_printDoc = new PrintDocument();  
m\_printDoc.PrintPage += new PrintPageEventHandler(m\_printDoc\_PrintPage);  
//打印页边距（百分之一英寸）-- 暂时没有设置成功  
//m\_printDoc.OriginAtMargins = true;  
//m\_printDoc.DefaultPageSettings.Margins = new Margins(10, 10, 10, 10);  
//打印纸张大小（百分之一英寸）  
m\_printDoc.DefaultPageSettings.PaperSize = new PaperSize("newPage"  
, (int)Utility.CommonMethod.MillimetersToInches(m\_pageWidth) \* 100 //四舍五入到double再转int  
, (int)Utility.CommonMethod.MillimetersToInches(m\_pageHeight) \* 100);  
\}  
  
  
private PrintDocument m\_printDoc = null;  
private PrintPreviewDialog m\_printPreview=new PrintPreviewDialog();  
private float m\_pageWidth = 230.5F;//单位毫米  
private float m\_pageHeight = 100.5F;//单位毫米  
private float m\_recWidth = 50F;//单位毫米  
private float m\_recHeight = 35F;//单位毫米  
  
  
/// <summary>  
/// 绘制需要打印的内容  
/// </summary>  
void m\_printDoc\_PrintPage(object sender, PrintPageEventArgs e)  
\{  
//绘制背景  
e.Graphics.PageUnit = GraphicsUnit.Inch;  
e.Graphics.FillRectangle(Brushes.White, 0F, 0F  
, Utility.CommonMethod.MillimetersToInches(m\_pageWidth)  
, Utility.CommonMethod.MillimetersToInches(m\_pageHeight));  
  
  
DrawingByInches(e.Graphics);  
DrawingByMillimeters(e.Graphics);  
DrawingByPixel(e.Graphics);  
\}  
/// <summary>  
/// 以英寸为单位绘制  
/// </summary>  
private void DrawingByInches(Graphics g)  
\{  
g.PageUnit = GraphicsUnit.Inch;  
g.FillRectangle(Brushes.White, 0F, 0F  
, Utility.CommonMethod.MillimetersToInches(m\_pageWidth)  
, Utility.CommonMethod.MillimetersToInches(m\_pageHeight));  
g.DrawRectangle(new Pen(Brushes.Red, 0.01f), 0.5f, 0.5f  
, Utility.CommonMethod.MillimetersToInches(m\_recWidth)  
, Utility.CommonMethod.MillimetersToInches(m\_recHeight));  
\}  
/// <summary>  
/// 以毫米为单位绘制  
/// </summary>  
private void DrawingByMillimeters(Graphics g)  
\{  
g.PageUnit = GraphicsUnit.Millimeter;  
g.DrawRectangle(new Pen(Brushes.Blue, 0.2f),20f, 20f  
, m\_recWidth  
, m\_recHeight);  
\}  
/// <summary>  
/// 以像素为单位绘制  
/// </summary>  
private void DrawingByPixel(Graphics g)  
\{  
g.PageUnit = GraphicsUnit.Pixel;  
g.DrawRectangle(new Pen(Brushes.Black, 1f), 80f, 50f  
, Utility.CommonMethod.MillimetersToPixel(m\_recWidth, g.DpiX)  
, Utility.CommonMethod.MillimetersToPixel(m\_recHeight, g.DpiY));  
\}  
  
  
private void btnView\_Click(object sender, EventArgs e)  
\{  
m\_printPreview.Document = m\_printDoc;  
m\_printPreview.ShowDialog();  
\}  
  
  
private void btnPrint\_Click(object sender, EventArgs e)  
\{  
m\_printDoc.Print();  
\}  
\#endregion  
\}  
\}

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using System;  
using System.Windows.Forms;  
  
  
namespace PrintOrder.Utility  
\{  
/// <summary>  
/// 公共方法  
/// </summary>  
public class CommonMethod  
\{  
/// <summary>  
/// 显示普通 MessageBox 提示框  
/// </summary>  
/// <param name="msg"></param>  
public static void ShowMessageBox(string msg)  
\{  
MessageBox.Show(msg,"提示");  
\}  
/// <summary>  
/// 毫米转为像素(注：dpi分水平和垂直，获取方法为得到 Graphics 的实例化对象 g，调用g.DpiX、g.DpiY)  
/// </summary>  
/// <param name="mm">毫米</param>  
/// <param name="fDPI">分辨率(水平/垂直)</param>  
/// <returns></returns>  
public static float MillimetersToPixel(float mm, float fDPI)  
\{  
//毫米转像素：mm \* dpi / 25.4  
return (float)Math.Round((mm \* fDPI / 25.4f),2);  
\}  
/// <summary>  
/// 像素转为毫米(注：dpi分水平和垂直，获取方法为得到 Graphics 的实例化对象 g，调用g.DpiX、g.DpiY)  
/// </summary>  
/// <param name="px">像素</param>  
/// <param name="fDPI">分辨率(水平/垂直)</param>  
/// <returns></returns>  
public static float PixelToMillimeters(float px, float fDPI)  
\{  
//像素转毫米：px \* 25.4 / dpi  
return (float)Math.Round(((px \* 25.4f) / fDPI), 2); ;  
\}  
/// <summary>  
/// 英寸到像素  
/// </summary>  
/// <param name="inches"></param>  
/// <returns></returns>  
public static float InchesToPixels(float inches, float fDPI)  
\{  
return (float)Math.Round(inches \* fDPI,2);  
\}  
/// <summary>  
/// 像素到英寸  
/// </summary>  
/// <param name="px"></param>  
/// <returns></returns>  
public static float PixelsToInches(float px, float fDPI)  
\{  
return (float)Math.Round(px / fDPI,2);  
\}  
/// <summary>  
/// 毫米到英寸  
/// </summary>  
/// <param name="mm"></param>  
/// <returns></returns>  
public static float MillimetersToInches(float mm)  
\{  
return (float)Math.Round(mm / 25.4f, 2);  
\}  
/// <summary>  
/// 英寸到毫米  
/// </summary>  
/// <param name="mm"></param>  
/// <returns></returns>  
public static float InchesToMillimeters(float Inches)  
\{  
return (float)Math.Round(Inches \* 25.4f, 2);  
\}  
\}  
\}

[1363322907_8124.gif]: https://img-my.csdn.net/uploads/201303/15/1363322907_8124.gif
[1363322915_5281.gif]: https://img-my.csdn.net/uploads/201303/15/1363322915_5281.gif