/// <summary>
/// 获取二维码图片
/// </summary>
/// <param name="sData"></param>
/// <param name="size"></param>
/// <returns></returns>
public static string GetQrCode(string sData, int size)
{
//二维码版本,大小获取
Color qrCodeBackgroundColor = Color.White;
Color qrCodeForegroundColor = Color.Black;
int length = System.Text.Encoding.UTF8.GetBytes(sData).Length;
//生成二维码数据
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;//使用H纠错级别
qrCodeEncoder.QRCodeVersion = 0;
var encodedData = qrCodeEncoder.Encode(sData, System.Text.Encoding.UTF8);
//绘制图片
int x = 0, y = 0;
int w = 0, h = 0;
// 二维码矩阵单边数据点数目
int count = encodedData.Length;
// 获取单个数据点边长
double sideLength = Convert.ToDouble(size) / count;
// 初始化背景色画笔
SolidBrush backcolor = new SolidBrush(qrCodeBackgroundColor);
// 初始化前景色画笔
SolidBrush forecolor = new SolidBrush(qrCodeForegroundColor);
// 定义画布
Bitmap image = new Bitmap(size, size);
// 获取GDI+绘图图画
Graphics graph = Graphics.FromImage(image);
// 先填充背景色
graph.FillRectangle(backcolor, 0, 0, size, size);
// 变量数据矩阵生成二维码
for (int row = 0; row < count; row++)
{
for (int col = 0; col < count; col++)
{
// 计算数据点矩阵起始坐标和宽高
x = Convert.ToInt32(Math.Round(col * sideLength));
y = Convert.ToInt32(Math.Round(row * sideLength));
w = Convert.ToInt32(Math.Ceiling((col + 1) * sideLength) - Math.Floor(col * sideLength));
h = Convert.ToInt32(Math.Ceiling((row + 1) * sideLength) - Math.Floor(row * sideLength));
// 绘制数据矩阵
graph.FillRectangle(encodedData[col][row] ? forecolor : backcolor, x, y, w, h);
}
}
//添加LOGO
string url = Fetch.GetUploadFileUrl("/Site/qrsmall.png");
Bitmap logoImage = null;
HttpWebRequest webRequest = (HttpWebRequest)HttpWebRequest.Create(url);
try
{
HttpWebResponse webReponse = (HttpWebResponse)webRequest.GetResponse();
if (webReponse.StatusCode == HttpStatusCode.OK)
{
using (Stream stream = webReponse.GetResponseStream())
{
System.Drawing.Image img = System.Drawing.Image.FromStream(stream);
logoImage = new Bitmap(img);
img.Dispose();
if (logoImage != null)
{
image = CoverImage(image, logoImage, graph);
logoImage.Dispose();
}
using (MemoryStream ms = new MemoryStream())
{
image.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
byte[] bts = ms.ToArray();
string baseImg = Convert.ToBase64String(bts);
image.Dispose();
return("data:image/jpeg;base64," + baseImg);
}
}
}
return("");
}
catch (Exception)
{
return("");
}
}