DmyTestprintPreviewmainwindowcpp1 warning C4819 该文件包含不能在当前代码页936中表示的字符。请将该文件保存为 Unicode 格式以防止数据丢失

This warning message is indicating that the file "mainwindow.cpp" contains characters that cannot be represented in the current code page (936), which is the Simplified Chinese code page. It suggests saving the file in Unicode format to prevent any data loss.

To resolve this warning, follow these steps:

1. Open the "mainwindow.cpp" file in a text editor or an integrated development environment (IDE) that supports Unicode encoding.
2. Go to the "Save As" option in the file menu.
3. Choose the Unicode (UTF-8, UTF-16, or UTF-32) encoding option.
4. Save the file with the same name or a different name in the chosen Unicode encoding.
5. Replace the original "mainwindow.cpp" file with the newly saved Unicode version.

By saving the file in Unicode format, you will ensure that all characters can be properly represented and avoid any potential data loss