| #region base64转图片
/// <summary>
/// 图片上传 Base64解码
/// </summary>
/// <param name="dataURL">Base64数据</param>
/// <param name="imgName">图片名字</param>
/// <returns>返回一个相对路径</returns>
public string decodeBase64ToImage(string dataURL,string imgName)
{
string filename = "";//声明一个string类型的相对路径
String base64 = dataURL.Substring(dataURL.IndexOf(",") + 1); //将‘，’以前的多余字符串删除
System.Drawing.Bitmap bitmap = null;//定义一个Bitmap对象，接收转换完成的图片
try//会有异常抛出，try，catch一下
{
byte[] arr = Convert.FromBase64String(base64);//将纯净资源Base64转换成等效的8位无符号整形数组
System.IO.MemoryStream ms = new System.IO.MemoryStream(arr);//转换成无法调整大小的MemoryStream对象
bitmap = new System.Drawing.Bitmap(ms);//将MemoryStream对象转换成Bitmap对象
filename ="Knowledge_" + imgName + ".jpg";//所要保存的相对路径及名字
string url =HttpRuntime.AppDomainAppPath.ToString();
string tmpRootDir = System.Web.HttpContext.Current.Server.MapPath(System.Web.HttpContext.Current.Request.ApplicationPath.ToString()); //获取程序根目录
string imagesurl2 = tmpRootDir + filename; //转换成绝对路径
bitmap.Save(imagesurl2, System.Drawing.Imaging.ImageFormat.Jpeg);//保存到服务器路径
//bitmap.Save(filePath + ".bmp", System.Drawing.Imaging.ImageFormat.Bmp);
//bitmap.Save(filePath + ".gif", System.Drawing.Imaging.ImageFormat.Gif);
//bitmap.Save(filePath + ".png", System.Drawing.Imaging.ImageFormat.Png);
ms.Close();//关闭当前流，并释放所有与之关联的资源
bitmap.Dispose();
}
catch (Exception e)
{
string massage= e.Message;
}
return filename;//返回相对路径
}
#endregion
#region 图片转base64
/// <summary>
/// 图片转base64
/// </summary>
/// <param name="path">图片路径</param><br> /// <returns>返回一个base64字符串</returns>
public string decodeImageToBase64(string path) {
path = "E:/vs 2015/newaqtcprj/WEB/UpFile/2018/12/20181229174708_7471722c425a2ec08fa513ddf4f8c76306d55fbb0fbd9d8.jpg";
string base64str = "";
//站点文件目录
string fileDir = HttpContext.Current.Server.MapPath("/");
string[] arrfileDir = fileDir.Split('\\');
fileDir = arrfileDir[0] + "\\" + arrfileDir[1] + "\\" + arrfileDir[2];
try
{
//读图片转为Base64String
System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(Path.Combine(fileDir, "WEB\\UpFile\\2018\\12\\20181229174708_7471722c425a2ec08fa513ddf4f8c76306d55fbb0fbd9d8.jpg"));
//System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(path);
MemoryStream ms = new MemoryStream();
bmp.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();
bmp.Dispose();
base64str = Convert.ToBase64String(arr);
}
catch (Exception e)
{
string mss = e.Message;
}
return "data:image/jpg;base64," + base64str;
}
#endregion
| 