Get Captcha Image c#
public FileResult GetCaptchaImage()
{
MemoryStream ms = new MemoryStream();
if (Session["CAPTCHA"] != null)
{
string text = Session["CAPTCHA"].ToString();
//first, create a dummy bitmap just to get a graphics object
Image img = new Bitmap(1, 1);
Graphics drawing = Graphics.FromImage(img);
Font font = new Font("Arial", 15);
//measure the string to see how big the image needs to be
SizeF textSize = drawing.MeasureString(text, font);
//free up the dummy image and old graphics object
img.Dispose();
drawing.Dispose();
//create a new image of the right size
img = new Bitmap((int)textSize.Width + 40, (int)textSize.Height + 20);
drawing = Graphics.FromImage(img);
Color backColor = Color.SeaShell;
Color textColor = Color.Red;
//paint the background
drawing.Clear(backColor);
//create a brush for the text
Brush textBrush = new SolidBrush(textColor);
drawing.DrawString(text, font, textBrush, 20, 10);
drawing.Save();
font.Dispose();
textBrush.Dispose();
drawing.Dispose();
img.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
img.Dispose();
return File(ms.ToArray(), "image/png");
}
else
{
return File(ms.ToArray(), "image/png");
}
}2020-01-31