netcore在CentOS7下使用处理图片的问题
请看代码,当你在centos下要把图片转为Base64的时候
1 MemoryStream ms = new MemoryStream(); 2try3 {
4 Bitmap bmp = new Bitmap(filePath);
5 bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
6
7byte[] arr = newbyte[ms.Length];
8 ms.Position = 0;
9 ms.Read(arr, 0, (int)ms.Length);
10return Convert.ToBase64String(arr);
11 }
12catch (Exception ex)
13 {
14 Core.Helpers.Log4NetHelper.WriteError(typeof(string),ex);
15return"";
16 }
17finally
18 {
19 ms.Close();
20 }
明明你在本地或windows服务器是正常的,可是在linux下就会抛出如下异常:
System.TypeInitializationException: The type initializer for "Gdip" threw an exception. ---> System.DllNotFoundException: Unable to load DLL "libgdiplus": The specified module could not be found.at System.Runtime.InteropServices.FunctionWrapper`
1.get_Delegate()at System.Drawing.SafeNativeMethods.Gdip.GdiplusStartup(IntPtr& token, StartupInput& input, StartupOutput& output)
at System.Drawing.SafeNativeMethods.Gdip..cctor()
--- End of inner exception stack trace ---
at System.Drawing.SafeNativeMethods.Gdip.GdipCreateBitmapFromFile(String filename, IntPtr& bitmap)
at System.Drawing.Bitmap..ctor(String filename, Boolean useIcm)
看了报错信息知道 linux没有 libgdiplus
解决方案:
#locate libdl
#cd /usr/lib64 #ln -s libdl-2.17.so libdl.so
如果 locate libdl 报以下错误:
-bash: locate: command not found
其原因是没有安装mlocate这个包
安装一下包:#yum -y install mlocate
再更新一下库:#updatedb
最后最关键的是安装一下 libgdiplus 库,搞定!
yum install libgdiplus-devel
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