C/C++ 错误: 'ui_demo.h' 文件未找到解决方案

This error message indicates that the compiler could not find the file 'ui_demo.h'. This file may be missing or it may be located in a different directory than the one specified by the compiler.

To resolve this error, make sure that the file 'ui_demo.h' is present in the correct directory and that the compiler is configured to search for header files in that directory. You may also need to add the directory containing the header file to the include path of the compiler.

If you are using an integrated development environment (IDE), you can check the project settings or preferences to ensure that the correct directories are included in the search path. If you are compiling from the command line, you can specify the include path using the -I option followed by the directory path.