/// <summary>
/// 获取验证码 base64
/// </summary>
/// <returns></returns>
private async Task <ValidateCodeModel> GetValidateBase64()
{
try
{
LoginViewState = await GetTrueUrl();
string preUrl = LoginUrl.Remove(LoginUrl.LastIndexOf('/'));
var response = await HttpHelper.CreateHttpResponse($"{preUrl}/CheckCode.aspx", LoginUrl);
var model = new ValidateCodeModel()
{
PreUrl = preUrl,
LoginUrl = LoginUrl,
LoginViewState = LoginViewState
};
MemoryStream ms = null;
using (var stream = response.GetResponseStream())
{
Byte[] buffer = new Byte[response.ContentLength];
int offset = 0, actuallyRead = 0;
do
{
actuallyRead = stream.Read(buffer, offset, buffer.Length - offset);
offset += actuallyRead;
}while (actuallyRead > 0);
ms = new MemoryStream(buffer);
}
response.Close();
Image image = Image.FromStream(ms);
Bitmap bitmap = new Bitmap(image);
ms = new MemoryStream();
bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
byte[] arr = new byte[ms.Length];
ms.Position = 0;
ms.Read(arr, 0, (int)ms.Length);
ms.Close();
model.Arr = arr;
model.ImageStream = ms;
model.ImageBase64 = Convert.ToBase64String(arr);
return(model);
}
catch (Exception e)
{
if (e is NetworkInformationException)
{
throw new ArgumentNullException("服务器忙，稍后再试");
}
else
{
throw new ArgumentNullException("服务内部错误");
}
}
}
/// <summary>
/// 获取验证码 stream 形式
/// </summary>
/// <returns></returns>
private async Task <ValidateCodeModel> GetValidate()
{
try
{
LoginViewState = await GetTrueUrl();
string preUrl = LoginUrl.Remove(LoginUrl.LastIndexOf('/'));
var response = await HttpHelper.CreateHttpResponse($"{preUrl}/CheckCode.aspx", LoginUrl);
var model = new ValidateCodeModel()
{
PreUrl = preUrl,
LoginUrl = LoginUrl,
LoginViewState = LoginViewState
};
using (var stream = response.GetResponseStream())
{
Byte[] buffer = new Byte[response.ContentLength];
int offset = 0, actuallyRead = 0;
do
{
actuallyRead = stream.Read(buffer, offset, buffer.Length - offset);
offset += actuallyRead;
}while (actuallyRead > 0);
model.ImageStream = new MemoryStream(buffer);
}
response.Close();
return(model);
}
catch (Exception e)
{
if (e is NetworkInformationException)
{
throw new ArgumentNullException("服务器忙，稍后再试");
}
else
{
throw new ArgumentNullException("服务内部错误");
}
}
}
