Requirements: Now that .NET Core can be cross-platform, publish the project to the Linux environment to run, and the project will include some image processing, such as: generating verification codes, watermarking images, etc.
First, create a .NET Core 3.1 console project (the source code is attached at the end of the article), and image processing needs to be installed:System.Drawing.Common
Use the nuget package to manage the installation with the following command:
Publish the project as a single file, the target platform is: linux-x64, and the publishing configuration is as follows:
<?xml version="1.0" encoding="utf-8"?>
<!--
https://go.microsoft.com/fwlink/?LinkID=208121.
-->
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<Configuration>Release</Configuration>
<Platform>Any CPU</Platform>
<PublishDir>bin\Release\netcoreapp3.1\publish\</PublishDir>
<PublishProtocol>FileSystem</PublishProtocol>
<TargetFramework>netcoreapp3.1</TargetFramework>
<RuntimeIdentifier>linux-x64</RuntimeIdentifier>
<SelfContained>true</SelfContained>
<PublishSingleFile>True</PublishSingleFile>
<PublishTrimmed>False</PublishTrimmed>
</PropertyGroup>
</Project>
Upload the published file to the CentOS server, andGive the file execution permissions！ Otherwise, the program will not run with the following command:
Then execute the file, and the problems you may encounter are as follows:
If the error is as follows:
Unhandled exception. System.TypeInitializationException: The type initializer for 'Gdip' threw an exception.
---> System.DllNotFoundException: Unable to load shared library 'libgdiplus' or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: liblibgdiplus: cannot open shared object file: No such file or directory
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.GdipLoadImageFromFile(String filename, IntPtr& image)
at System.Drawing.Image.FromFile(String filename, Boolean useEmbeddedColorManagement)
at System.Drawing.Image.FromFile(String filename)
at ImageWatermark.Program.Main(String[] args)
Aborted
Try to re-execute, and you can find that the execution succeeded, as shown in the following image:
View the watermarked image and open the "57f2305a-6850-41af-80ab-8d2bf89569e5.jpg" file, the effect is as follows:
Discovery,Chinese characters are garbled, there is no problem with English characters, check the font installed by the system, the command is as follows:
If the command is not available in the system, we need to install the relevant software package first, the command is as follows:
Solution, install the open-source commercially available google-noto font with the following command:
Modify the font used in the source code, republish and upload to the server, and the execution result is as follows:
You can see that you can successfully add a Chinese watermark with the following code:
Source code download:
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(End)
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Posted on 2021-3-28 14:46:15
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Landlord|
Posted on 2021-6-16 14:10:48
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Posted on 2022-12-29 11:49:27
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