How to Display UTF-8 Strings Correctly in Windows Consoles Using Go?

How to Output Strings Correctly in Windows Consoles Using Go

When executing a Go program that prints UTF-8 encoded strings in a console window on Windows, the output may appear garbled due to differences in encoding standards. Windows typically uses IBM850 encoding, while Go uses UTF-8 by default.

To address this issue and ensure strings are printed correctly in a console window:

Use the consolePrintString Function:

The provided code defines a function called consolePrintString that uses undocumented but effective methods to handle string output in a Windows-specific environment.

Convert UTF-8 to UTF-16:

Within the consolePrintString function, the input UTF-8 string is converted to UTF-16 using the Encode function from the unicode/utf16 package. UTF-16 is the preferred encoding for console output.

Write to Console:

The WriteConsoleW function from the kernel32.dll library is used to write the UTF-16 string to the console. It takes parameters that specify the console handle, the address of the string data, the string length, and a pointer for recording the number of characters written.

Example Usage:

In the provided main function, two strings are printed using the consolePrintString function: "Hello ☺" and "éèïöîôùòèìë". These strings should now be displayed correctly in the console window.

Note:

This method employs undocumented APIs and does not handle various scenarios, such as stdout redirection or error handling. Use it with caution and understanding of its limitations.

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