GetCaptcha() public méthode

製作Captcha
public GetCaptcha ( string text, string fontName, string backgroundImagePath, int width, int height, int fontSize, short waterEffect = 10 ) : Bitmap
text string 文字
fontName string 字體名稱
backgroundImagePath string 採樣的背景圖
width int 結果的圖片寬度
height int 結果的圖片高度
fontSize int 字體大小
waterEffect short 增加漣漪複雜度
Résultat System.Drawing.Bitmap
Helper Class Documentation
Exemple #1
0
        protected void Page_Load(object sender, EventArgs e)
        {
            CurrentCaptcha = FormsAuthentication.HashPasswordForStoringInConfigFile(Guid.NewGuid().ToString(), "MD5").Substring(0, 4);
            Helper helper=new Helper();

            var result = helper.GetCaptcha(CurrentCaptcha, "Verdana", Server.MapPath("bk.jpg"), 95, 65, 22, 7);

            //設定 ContentType 為 jpg圖片
            // Set the ContentType to jpg picture.
            Response.ContentType = "image/jpeg";
            //注意這邊要用writefile 其中帶入圖片路徑
            byte[] data = null;

            using (MemoryStream oMemoryStream = new MemoryStream())
            {

                //儲存圖片到 MemoryStream 物件，並且指定儲存影像之格式
                //Save image to MemoryStream  and set it to jpeg format.
                result.Save(oMemoryStream, ImageFormat.Jpeg);
                //設定資料流位置
                //Set stream position start from zero
                oMemoryStream.Position = 0;
                //設定 buffer 長度
                //Set buffer length
                data = new byte[oMemoryStream.Length];
                //將資料寫入 buffer
                //Wrire data to buffer
                oMemoryStream.Read(data, 0, Convert.ToInt32(oMemoryStream.Length));
                //將所有緩衝區的資料寫入資料流
                //Flush memory.
                oMemoryStream.Flush();

            }
            //將buffer 中的stream全部送出
            Response.BinaryWrite(data);
            Response.Flush();
        }
Exemple #2
0
 protected void Page_Load(object sender, EventArgs e)
 {
     //如果只是postback 就不更新
     if (!IsPostBack)
     {
         //取一個新的GUID 然後取MD5 因為GUID只有到F 並取四碼
         CurrentCaptcha = FormsAuthentication.HashPasswordForStoringInConfigFile(Guid.NewGuid().ToString(), "MD5").Substring(0, 4);
         Helper helper = new Helper();
         var result = helper.GetCaptcha(CurrentCaptcha, "Verdana", Server.MapPath("bk.jpg"), 95, 65, 22, 2);
         Image1.Src = "data:image/" + GetImageFormat(result) + ";base64," + ImageToBase64(result);
     }
 }