Gma.QrCodeNet.Encoding.ErrorCorrectionLevel ToErrorCorrectionLevel(ErrorCorrectionLevel level)
{
switch (level)
{
case ErrorCorrectionLevel.L:
return(Gma.QrCodeNet.Encoding.ErrorCorrectionLevel.L);
case ErrorCorrectionLevel.M:
return(Gma.QrCodeNet.Encoding.ErrorCorrectionLevel.M);
case ErrorCorrectionLevel.Q:
return(Gma.QrCodeNet.Encoding.ErrorCorrectionLevel.Q);
case ErrorCorrectionLevel.H:
return(Gma.QrCodeNet.Encoding.ErrorCorrectionLevel.H);
default:
throw new NotSupportedException("不受支持的ErrorCorrectionLevel值: " + level.ToString());
}
}
/// <summary>
/// Generates an QR BarCode containing the specified data.
/// </summary>
/// <param name="data">The data to encode.</param>
/// <param name="size">Image size.</param>
/// <param name="margin">The width of the white border around the data portion of the code. This is in rows, not in pixels.</param>
/// <param name="errorCorrection">QR codes support four levels of error correction to enable recovery of missing, misread, or obscured data. Greater redundancy is achieved at the cost of being able to store less data.</param>
/// <returns>The image containing the generated QR BarCode.</returns>
public static Image Generate(string data, int size, int margin, ErrorCorrectionLevel errorCorrection)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
if (size < 1)
{
throw new ArgumentOutOfRangeException("size", size, "Must be greater than zero.");
}
if (margin < 0)
{
throw new ArgumentOutOfRangeException("margin", margin, "Must be greater than or equal to zero.");
}
if (!Enum.IsDefined(typeof(ErrorCorrectionLevel), errorCorrection))
{
throw new InvalidEnumArgumentException("errorCorrectionLevel", (int)errorCorrection, typeof(ErrorCorrectionLevel));
}
var link = string.Format(m_GoogleApiUrl, size, HttpUtility.UrlEncode(data), errorCorrection.ToString()[0], margin);
using (var ms = new MemoryStream(m_WebClient.DownloadData(link)))
{
return(Image.FromStream(ms));
}
}
