public static string GenerateBarCode(string id)
{
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
qrCodeEncoder.QRCodeScale = 4;
// qrCodeEncoder.QRCodeVersion = 4;
qrCodeEncoder.QRCodeVersion = 0;
qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
//System.Drawing.Image image = qrCodeEncoder.Encode("4408810820 深圳－广州 小江");
global::System.Drawing.Image image = qrCodeEncoder.Encode(id);
string filename = Guid.NewGuid().ToString() + ".jpg";
string fileMonthPath = System.Web.HttpContext.Current.Server.MapPath(@"~\UploadFile") + "\\" + DateTime.Now.ToString("yyyyMM");
if (!System.IO.Directory.Exists(fileMonthPath))
{
System.IO.Directory.CreateDirectory(fileMonthPath);
}
string filepath = fileMonthPath + "\\" + filename;
global::System.IO.FileStream fs = new global::System.IO.FileStream(filepath, global::System.IO.FileMode.OpenOrCreate, global::System.IO.FileAccess.Write);
image.Save(fs, global::System.Drawing.Imaging.ImageFormat.Jpeg);
fs.Close();
image.Dispose();
return(@"../../UploadFile/" + DateTime.Now.ToString("yyyyMM") + "/" + filename);
}
/// <summary>
/// 判斷一個串流是哪種影像格式，可傳回 jpg, bmp, gif, png，若不是影像，則傳回空字串
/// </summary>
/// <param name="strm"></param>
/// <returns></returns>
public static string GetImageFormat(this Stream strm)
{
// 讀取之前，先回到第一位元
strm.Position = 0;
// 只讀取前面兩個位元組
byte[] buffer = new byte[2];
strm.Read(buffer, 0, 2);
// 將兩 bytes 資料轉成易讀的 16 進位
string header = Convert.ToString(buffer[0], 16) + Convert.ToString(buffer[1], 16);
// 第一次判斷圖檔格式
string format;
switch (header.ToUpper())
{
case "FFD8":
format = "jpg";
break;
case "424D":
format = "bmp";
break;
case "4749":
format = "gif";
break;
case "8950":
format = "png";
break;
default:
format = "";
break;
}
// 先從最前面幾個位元組初步判斷格式後，為避免有些檔案是利用這個技巧刻意偽裝成圖檔，所以再進一步檢查
if (format != "")
{
global::System.Drawing.Image img = null;
try
{
img = global::System.Drawing.Image.FromStream(strm);
}
catch (Exception)
{
// 會出錯代表它其實不是圖檔，而是有刻意偽裝過的
format = "";
}
finally
{
if (img != null)
{
img.Dispose();
}
img = null;
}
}
return(format);
}