Csharp: 打印設置字符之間的間距

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Drawing.Imaging;
using System.Drawing.Printing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Drawing;

namespace Geovin.Du.ControlLibrary
{
/// <summary>
/// 設置字符之間的間距
///
/// </summary>
public class GdiPlusMethods
{
#region Declare

[System.Runtime.InteropServices.DllImport("Gdiplus.dll", CharSet = System.Runtime.InteropServices.CharSet.Unicode)]
internal extern static int GdipMeasureDriverString(IntPtr g, string pText, int pLength, IntPtr pFont, System.Drawing.PointF[] pPositions, int pFlags, IntPtr pMatrix, ref System.Drawing.RectangleF pBounds);

[System.Runtime.InteropServices.DllImport("Gdiplus.dll", CharSet = System.Runtime.InteropServices.CharSet.Unicode)]
internal extern static int GdipDrawDriverString(IntPtr g, string pText, int pLength, IntPtr pFont, IntPtr pBrush, System.Drawing.PointF[] pPositions, int pFlags, IntPtr pMatrix);

#endregion Declare

#region GdiPlusMethods
/// <summary>
///
/// </summary>
private GdiPlusMethods()
{
}
#endregion GdiPlusMethods

#region DriverStringOptions
/// <summary>
///
/// </summary>
private enum DriverStringOptions
{
CmapLookup = 1,
Vertical = 2,
Advance = 4,
LimitSubpixel = 8,
}
#endregion DriverStringOptions

#region DrawDriverString
/// <summary>
/// 字符間距
/// </summary>
/// <param name="g"></param>
/// <param name="pText"></param>
/// <param name="pFont"></param>
/// <param name="pBrush"></param>
/// <param name="pPositions"></param>
private static void DrawDriverString(System.Drawing.Graphics g, string pText, System.Drawing.Font pFont, System.Drawing.Brush pBrush, System.Drawing.PointF[] pPositions)
{
try
{
DrawDriverString(g, pText, pFont, pBrush, pPositions, null);

}
catch (NullReferenceException NullEx)
{
throw NullEx;
}
catch (Exception Ex)
{
throw Ex;
}
}
#endregion DrawDriverString

#region DrawDriverString
/// <summary>
///
/// </summary>
/// <param name="g"></param>
/// <param name="pText"></param>
/// <param name="pFont"></param>
/// <param name="pBrush"></param>
/// <param name="pRect"></param>
/// <param name="pHeight"></param>
private static void DrawDriverString(System.Drawing.Graphics g, string pText, System.Drawing.Font pFont, System.Drawing.Brush pBrush, System.Drawing.Rectangle pRect, int pHeight)
{
try
{
System.Drawing.PointF[] mPositions = new System.Drawing.PointF[pText.Length];
System.Drawing.Size mSize = g.MeasureString(pText, pFont).ToSize();

//int mTextHeight = mSize.Height;
int mRow = 1;
int mPosX = 0;

for (int i = 0; i < pText.Length; i++)
{
mSize = g.MeasureString(pText.Substring(i, 1), pFont).ToSize();

if ((mPosX + mSize.Width) > pRect.Width)
{
mPosX = 0;
mRow = mRow + 1;
}

mPositions[i] = new System.Drawing.PointF(pRect.Left + mPosX, pRect.Top + mRow * pHeight);

mPosX = mPosX + mSize.Width;

}

DrawDriverString(g, pText, pFont, pBrush, mPositions, null);

}
catch (NullReferenceException NullEx)
{
throw NullEx;
}
catch (Exception Ex)
{
throw Ex;
}
}
#endregion DrawDriverString

#region DrawDriverString
/// <summary>
///
/// </summary>
/// <param name="g"></param>
/// <param name="pText"></param>
/// <param name="pFont"></param>
/// <param name="pBrush"></param>
/// <param name="pPositions"></param>
/// <param name="pMatrix"></param>
private static void DrawDriverString(System.Drawing.Graphics g, string pText, System.Drawing.Font pFont, System.Drawing.Brush pBrush, System.Drawing.PointF[] pPositions, System.Drawing.Drawing2D.Matrix pMatrix)
{
try
{

if (g == null)
throw new ArgumentNullException("graphics");
if (pText == null)
throw new ArgumentNullException("text");
if (pFont == null)
throw new ArgumentNullException("font");
if (pBrush == null)
throw new ArgumentNullException("brush");
if (pPositions == null)
throw new ArgumentNullException("positions");

// Get hGraphics
System.Reflection.FieldInfo field = typeof(System.Drawing.Graphics).GetField("nativeGraphics", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
IntPtr hGraphics = (IntPtr)field.GetValue(g);

// Get hFont
field = typeof(System.Drawing.Font).GetField("nativeFont", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
IntPtr hFont = (IntPtr)field.GetValue(pFont);

// Get hBrush
field = typeof(System.Drawing.Brush).GetField("nativeBrush", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
IntPtr hBrush = (IntPtr)field.GetValue(pBrush);

// Get hMatrix
IntPtr hMatrix = IntPtr.Zero;
if (pMatrix != null)
{
field = typeof(System.Drawing.Drawing2D.Matrix).GetField("nativeMatrix", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
hMatrix = (IntPtr)field.GetValue(pMatrix);
}

int result = GdipDrawDriverString(hGraphics, pText, pText.Length, hFont, hBrush, pPositions, (int)DriverStringOptions.CmapLookup, hMatrix);
}
catch (NullReferenceException NullEx)
{
throw NullEx;
}
catch (Exception Ex)
{
throw Ex;
}
}

/// <summary>
/// 設置字符間距
/// 塗聚文
/// </summary>
/// <param name="g">Drawing.Graphics</param>
/// <param name="pText">字符</param>
/// <param name="x">X坐標</param>
/// <param name="y">Y坐標</param>
/// <param name="width">字符寬度</param>
/// <param name="pFont">字體</param>
/// <param name="pBrush"></param>
public static void DrawStringCharacterSpacing(System.Drawing.Graphics g, string pText, float x, float y, float width, System.Drawing.Font pFont, System.Drawing.Brush pBrush)
{

//Get the height of myFont.
float height = pFont.GetHeight(g);
//當大於兩個字符時進行設置
if (pText.Length >= 2)
{
g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
SizeF size = g.MeasureString(pText, pFont, int.MaxValue);//int.MaxValue
float h = size.Height;
float w = size.Width;

PointF[] positions = new PointF[pText.Length];
for (int i = 0; i < pText.Length; i++)
{
positions[i] = new PointF(i * width + x, y); //20 為字間距離

}

DrawDriverString(g, pText, pFont, pBrush, positions);
}

}
#endregion DrawDriverString

}
}