public void ProcessRequest(HttpContext context)
{
HttpContextBase currentContext = new HttpContextWrapper(context);
bool isremove = false;
if (!string.IsNullOrEmpty(context.Request.QueryString["isremove"]))
{
bool.TryParse(context.Request.QueryString["isremove"], out isremove);
}
string cookieName = CaptchaSettings.Instance().CaptchaCookieName;
bool enableLineNoise = CaptchaSettings.Instance().EnableLineNoise;
CaptchaCharacterSet characterSet = CaptchaSettings.Instance().CharacterSet;
int minCharacterCount = CaptchaSettings.Instance().MinCharacterCount;
int maxCharacterCount = CaptchaSettings.Instance().MaxCharacterCount;
string generatedKey = string.Empty;
bool addCooikes = false;
//创建或从缓存取验证码
string key = null;
if (context.Request.Cookies[cookieName] != null)
{
key = context.Request.Cookies[cookieName].Value;
}
if (isremove && !string.IsNullOrEmpty(key))
{
VerificationCodeManager.GetCachedTextAndForceExpire(currentContext, getCurrentLevelKey(key));
}
System.IO.MemoryStream ms = null;
if (!string.IsNullOrEmpty(key))
{
ms = VerificationCodeManager.GetCachedImageStream(getCurrentLevelKey(key));
}
if (ms == null)
{
Size size = new Size(85, 30);
VerificationCodeImage image = VerificationCodeManager.GenerateAndCacheImage(currentContext, size, 300, out generatedKey, characterSet, enableLineNoise, minCharacterCount, maxCharacterCount);
ms = VerificationCodeManager.GetCachedImageStream(getCurrentLevelKey(generatedKey));
VerificationCodeManager.CacheText(currentContext, image.Text, getCurrentLevelKey(generatedKey), false, 300);
addCooikes = true;
}
if (addCooikes)
{
HttpCookie cookie = new HttpCookie(cookieName, generatedKey);
context.Response.Cookies.Add(cookie);
}
context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
context.Response.ContentType = "image/Jpeg";
context.Response.BinaryWrite(ms.ToArray());
//context.Response.Flush();
context.Response.End();
}
private static VerificationCodeImage GenerateRandomAutoInputProtectionImage(Size size, CaptchaCharacterSet characterSet, int?maximumCharacters, int?minimumCharacters)
{
if (size.Width < 1 || size.Height < 1)
{
throw new ArgumentOutOfRangeException("size", size, "Errors.SizePositiveIntRequired");
}
EnsureProviders();
VerificationCodeImage image = null;
lock (VerificationCodeImageLockObj)
{
image = imageProvider.GenerateRandomAutoInputProtectionImage(size, textProvider, characterSet, maximumCharacters, minimumCharacters);
}
image.filters = filterProviders;
return(image);
}
/// <summary>
///创建验证码以及图片的数据流
/// </summary>
private static bool CreateImageStream(ref int attempt, HttpContextBase context, VerificationCodeImage aipImage, bool isUseLineNoise, out MemoryStream stream)
{
stream = null;
using (Image image = aipImage.CreateCompositeImage(isUseLineNoise))
{
try
{
stream = new MemoryStream(image.Width * image.Height);
image.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (ArgumentException)
{
if (stream != null)
{
stream.Dispose();
}
attempt++;
if (attempt == 3)
{
throw;
}
return(false);
}
}
return(true);
}
/// <summary>
///创建验证码以及图片的数据流
/// </summary>
private static bool CreateImageStream(ref int attempt, HttpContextBase context, VerificationCodeImage aipImage, bool isUseLineNoise, out MemoryStream stream)
{
stream = null;
using (Image image = aipImage.CreateCompositeImage(isUseLineNoise))
{
try
{
stream = new MemoryStream(image.Width * image.Height);
image.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (ArgumentException)
{
if (stream != null)
stream.Dispose();
attempt++;
if (attempt == 3)
throw;
return false;
}
}
return true;
}
