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[Solved] Error: This requires the null safety language feature, which is experimental. You can enable the experiment using the '--enable-experiment=non-nullable' command line option.

Clay
2021-10-232021-10-23
Flutter

Today I used the customize icon to create the button when I developing a mobile application with Flutter, I got an error message as follow:

[GitHub] How to Remove GitHub Specific Folder of Repository

Clay
2021-10-232021-10-23
Git, Github

After we pushing the project that we developed to GitHub repository, if we want to rename or remove a folder, we cannot rename and re-push. It will cause the old version folder still exist.

[Linux] Rename a Large Number of Files With “rename” Command (Regular Expression)

Clay
2021-10-232021-10-23
Linux

If we want to rename a large number of files in batches, in addition to writing script to use mv command, we can also use rename command to set a rule to match the file name (just like regular expression) to rename.

[GitHub] Use "GitHub Readme Stats" to Show the Project Information on Your README

Clay
2021-10-232021-10-23
Github

If you want to make some changes to your personal page in GitHub, you can create a repository with the same name as account and add README.md to the repository. The README file will be show the top of the personal page.

[C++] Use find() To Match the Substring in a String

Clay
2021-10-222021-10-22
C/C++, C++

The string template in C++ STL is very convenient in processing strings. To record today is how to find the specific text or substring in a string data type variable.

[C++] How to Check The Variable Data Type with typeid()

Clay
2021-10-222021-10-22
C/C++, C++

In C++, we always can be clear about the data type of the variables we declared; however, sometimes we passed in some parameters from third-party libraries, so we are not so sure which data type it is.

[Solved][C++] cannot pass non-trivial object of type 'std::__1::string' (aka 'basic_string, allocator >') to variadic function; expected type from format string was 'char *'

Clay
2021-10-222021-10-22
C, C/C++, C++

Problem

If you want to print a string data type variable in C programming language, you can use the following code:

[Solved] Use Bluehost to Activate Cloudflare Error: There was a problem changing Cloudflare settings

Clay
2021-10-222021-10-22
WordPress

I have used the famous BLUEHOST that I host my WordPress website, there is no any big problem in the past few years. But today when I wanted to activate the Cloudflare service in the BLUEHOST backend, the following error message appeared:

[WordPress] Enable Free Plan Cloudflare for Personal Website

Clay
2021-10-222021-10-22
WordPress

Before we enable CDN service on WordPress, we need to talk about what Cloudflare is. Cloudflare is a CDN (Content Delivery Network) service, and CDN is a technology that shares resources with users faster through files stored on a server closer to the user.

[Solved][WordPress] The Website URL Has Strange Text: "?doing_wp_cron="

Clay
2021-10-212021-10-21
WordPress

I have noticed this problem for some time: in my website, behind the URLs of many articles and pages, there are more text like ?doing_wp_cron=xxxxxxxx. The x in that pile is all numbers.

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