csharp: 图片字符间距

引用WINDOWS API:

        [DllImport("gdi32.dll", CharSet = CharSet.Auto)]
        public static extern int SetTextCharacterExtra(IntPtr hdc, int nCharExtra);//图片字符间距
        [DllImport("gdi32.dll")]
        public static extern bool DeleteObject(IntPtr handle);
        [DllImport("gdi32.dll")]
        public static extern IntPtr SelectObject(IntPtr hdc, IntPtr bmp);

 .NET 2.0

/// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        /// <param name="fontSpace"></param>
        private void pictureBox_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            Font font = new Font("宋体", 12.0F);

            Brush brush = Brushes.Red;
            string text2 = "涂聚文";
            IntPtr hdc = e.Graphics.GetHdc();
            SetTextCharacterExtra(hdc, 16); // 设置字符间距   
            e.Graphics.ReleaseHdc(hdc);
            e.Graphics.DrawString(text2, font, brush, 20, 25);//

            //pictureBox1.Paint += new System.Windows.Forms.PaintEventHandler(this.pictureBox1_Paint);
        }

 .NET 3.5以上:

 /// <summary>
        /// 图片的字符间距(只对中文，数字，字母，符号有效，在中文环境下，中文日文混排无效)
        /// 涂聚文
        /// .net3.0以上
        /// </summary>
        /// <param name="width">图片宽度</param>
        /// <param name="height">图片高度</param>
        /// <param name="space">字间距</param>
        /// <param name="strtext">要显示的文字</param>
        /// <returns>图片</returns>
        Bitmap CreateImageString(int width, int height,int space ,string strtext)
        {
            Bitmap image = new Bitmap(width, height);
            using (Graphics g = Graphics.FromImage(image))
            {
                //绘制图片边框
                //g.DrawRectangle(Pens.Black, 0, 0, width - 1, height - 1);

                Font font = new Font("宋体", 12.0F);

                Brush brush = Brushes.Red;
                //绘制设置了字符间距的输出
                DrawStringExtra(g, space, x =>
                {
                    x.DrawString(strtext, font, brush, 0, 2);
                });
            }
            return image;
        }


        /// <summary>
        /// 
        /// </summary>
        /// <param name="g"></param>
        /// <param name="nCharExtra"></param>
        /// <param name="action"></param>
        void DrawStringExtra(Graphics g, int nCharExtra, Action<Graphics> action)
        {
            IntPtr hdc = g.GetHdc();
            SetTextCharacterExtra(hdc, nCharExtra);
            try
            {
                using (Graphics g1 = Graphics.FromHdc(hdc))
                {
                    action(g1);
                }
            }
            finally
            {
                SetTextCharacterExtra(hdc, 0);
                g.ReleaseHdc(hdc);
            }
        }

 调用:(可以应用于打印中)

 pictureBox1.Image = CreateImageStrin(100, 30, 10, "3315000"); 

 .net 2.0自写填空格来设置字间距，高版本有：Padding,PadRight,PadLeft

 /// <summary>
        /// 字符填充空格，而从设置字符间距
        /// 涂聚文
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public string SetPadstring(string str,int padwidth)
        {
            string s = string.Empty;
            string m = string.Empty;
            if (str.Length > 0)
            {
                char[] arr = str.ToCharArray();
                foreach (char d in arr)
                {
                    //MessageBox.Show(d.ToString());
                    m = m + d + PadRight(padwidth);
                }
            }
            s = m;
            return s;
        }


        /// <summary>
        /// 填充空格
        /// </summary>
        /// <param name="totalWidth"></param>
        /// <returns></returns>
        public string PadLeft(int totalWidth)
        {   
                string s="";

                if (totalWidth > 0)
                {
                    for (int i = 0; i < totalWidth; i++)
                    {
                        s =" "+ s  ;
                    }
                }
                return s;
       }

        /// <summary>
       /// 填充空格
        /// </summary>
        /// <param name="TotalWidth"></param>
        /// <returns></returns>
        public string PadRight(int TotalWidth)
        {
            string s = "";
            if (TotalWidth > 0)
            {
                for (int i = 0; i < TotalWidth; i++)
                {
                    s = s + " ";
                }
            }

            return s;
        }

　　

//测试
            
            string cs = "331500涂聚文";
            //char[] arr = cs.ToCharArray();
            //foreach (char d in arr)
            //{
            //    //MessageBox.Show(d.ToString());
            //    m = m + d+PadRight(1);
            //}
            //MessageBox.Show(m);
            MessageBox.Show(SetPadstring(cs, 1));