是否有 .NET API 可以生成这样的二维码?
我想在我希望我的用户打印出来的页面上显示这些。
我编写了一个基本的 HTML 辅助方法来发出正确的<img>
标签以利用 Google 的 API。因此,在您的页面上(假设为 ASPX 视图引擎)使用如下内容:
<%: Html.QRCodeImage(Request.Url.AbsolutePath) %>
<%: Html.QRCodeImage("Meagre human needs a phone to read QR codes. Ha ha ha.") %>
或者,如果您想以像素为单位指定大小(图像始终为正方形):
<%: Html.QRCodeImage(Request.Url.AbsolutePath, size: 92) %>
这是代码:
public static class QRCodeHtmlHelper
{
/// <summary>
/// Produces the markup for an image element that displays a QR Code image, as provided by Google's chart API.
/// </summary>
/// <param name="htmlHelper"></param>
/// <param name="data">The data to be encoded, as a string.</param>
/// <param name="size">The square length of the resulting image, in pixels.</param>
/// <param name="margin">The width of the border that surrounds the image, measured in rows (not pixels).</param>
/// <param name="errorCorrectionLevel">The amount of error correction to build into the image. Higher error correction comes at the expense of reduced space for data.</param>
/// <param name="htmlAttributes">Optional HTML attributes to include on the image element.</param>
/// <returns></returns>
public static MvcHtmlString QRCode(this HtmlHelper htmlHelper, string data, int size = 80, int margin = 4, QRCodeErrorCorrectionLevel errorCorrectionLevel = QRCodeErrorCorrectionLevel.Low, object htmlAttributes = null)
{
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(QRCodeErrorCorrectionLevel), errorCorrectionLevel))
throw new InvalidEnumArgumentException("errorCorrectionLevel", (int)errorCorrectionLevel, typeof (QRCodeErrorCorrectionLevel));
var url = string.Format("http://chart.apis.google.com/chart?cht=qr&chld={2}|{3}&chs={0}x{0}&chl={1}", size, HttpUtility.UrlEncode(data), errorCorrectionLevel.ToString()[0], margin);
var tag = new TagBuilder("img");
if (htmlAttributes != null)
tag.MergeAttributes(new RouteValueDictionary(htmlAttributes));
tag.Attributes.Add("src", url);
tag.Attributes.Add("width", size.ToString());
tag.Attributes.Add("height", size.ToString());
return new MvcHtmlString(tag.ToString(TagRenderMode.SelfClosing));
}
}
public enum QRCodeErrorCorrectionLevel
{
/// <summary>Recovers from up to 7% erroneous data.</summary>
Low,
/// <summary>Recovers from up to 15% erroneous data.</summary>
Medium,
/// <summary>Recovers from up to 25% erroneous data.</summary>
QuiteGood,
/// <summary>Recovers from up to 30% erroneous data.</summary>
High
}
一种选择是使用Google Chart Server API来完成。
例如,这是该页面的 QR 码...
不需要代码:)
链接文档中有更多详细信息,但您从 URL https://chart.googleapis.com/chart? ,然后添加查询参数:
cht=qr
:指定您想要一个二维码chs=
size : 指定大小,例如200x200
chl=
data : 指定数据,例如 URL还有其他用于输出编码和纠错的查询参数。
快速搜索会产生许多 QRCode 库(除了第一个之外,所有这些库都是商业的):
您还可以考虑“代码项目上的开源 QRCode 库”
还有一个 Nuget 包可用 - QRCodeHelper,它基于 Codeplex QRCode Helper项目。
这是另一个简单的 REST Web 服务:
例子