Please see the code, when you want to convert the picture to Base64 under centos
1 MemoryStream ms = new MemoryStream(); 2 try 3 { 4 Bitmap bmp = new Bitmap(filePath); 5 bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); 6 7 byte[] arr = new byte[ms.Length]; 8 ms.Position = 0; 9 ms.Read(arr, 0, (int)ms.Length); 10 return Convert.ToBase64String(arr); 11 } 12 catch (Exception ex) 13 { 14 Core.Helpers.Log4NetHelper.WriteError(typeof(string),ex); 15 return ""; 16 } 17 finally 18 { 19 ms.Close(); 20 }
Obviously it is normal for you to be on the local or windows server, but the following exception will be thrown under linux:
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)
Read the error message and know that Linux does not have libgdiplus
solution:
#locate libdl
#cd /usr/lib64 #ln -s libdl-2.17.so libdl.so
If locate libdl reports the following error:
-bash: locate: command not found
The reason is that the mlocate package is not installed
Install the package: #yum -y install mlocate
Update the library again: #updatedb
Finally, the most important thing is to install the libgdiplus library and get it done!
yum install libgdiplus-devel