將文字轉出條碼

參考來源：
http://www.techrepublic.com/blog/howdoi/how-do-i-generate-barcodes-using-c/173

1.建立將文字轉條碼的類別

public static Bitmap CreateBarcode(string sData)
    {
        //create Bitmap物件
        Bitmap barcode = new Bitmap(1, 1);

        //設定條碼字型
        Font threeOfNine = new Font("Free 3 of 9", 60, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point);

        //create圖形物件、載入Barcode字型
        Graphics graphics = Graphics.FromImage(barcode);

        //設定轉出條碼後的寬度、高度及字型
        SizeF datasize = graphics.MeasureString(sData, threeOfNine);

        //now we base the bitmap's size off of this data
        barcode = new Bitmap(barcode, datasize.ToSize());

        //依據更新後的bitmap刷新圖型物件
        graphics = Graphics.FromImage(barcode);

        //設定圖型物件背景顏色
        graphics.Clear(Color.White);

        //設定圖型物件的關聯文字的呈現模式為 SingleBitPerPixel
        //graphics.TextRenderingHint = TextRenderingHint.SingleBitPerPixel;
        graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixel;
       
        //將字串資料放入圖型物件
        graphics.DrawString(sData, threeOfNine, new SolidBrush(Color.Black), 0, 0);

        //圖型物件刷新
        graphics.Flush();

        //釋放物件
        threeOfNine.Dispose();
        graphics.Dispose();

        //回傳
        return barcode;
    }

2.畫面放一個Button、TextBox，Button事件裡面

        Bitmap barcode = HClass1.CreateBarcode("*" + TextBox1.Text + "*");
        barcode.Save(@"c:\barcode.gif", System.Drawing.Imaging.ImageFormat.Gif);