Why Are ANSI Colors Not Displaying in My Windows 10 Console?

Enable ANSI Color Support on Windows 10: A Persistent Dilemma

On Windows 10, adding colors to console output using ANSI escape sequences is a relatively recent feature. However, a peculiar issue has recently emerged where ANSI colors fail to display correctly on certain machines.

Situation Summary:

A user reports that an application displaying ANSI colors in the console suddenly stopped functioning. The app works as intended on other laptops but fails on their own Windows 10 machine (v14393).

Investigation and Troubleshooting:

• Deleting the HKLMConsole registry entry and restarting has proved ineffective.
• Modifying the shortcut settings to ensure they're not the culprit has yielded no results.
• Running the application as a different user on the same machine still results in failure.

Solution:

The key to resolving this issue lies in enabling virtual terminal processing on Windows. This setting was introduced in the update that caused the problem.

To activate virtual terminal processing, add the following code to the init() function in your Go application:

<code class="go">import (
    "golang.org/x/sys/windows"
    "os"
)

// +build windows

func init() {
    stdout := windows.Handle(os.Stdout.Fd())
    var originalMode uint32

    windows.GetConsoleMode(stdout, &originalMode)
    windows.SetConsoleMode(stdout, originalMode|windows.ENABLE_VIRTUAL_TERMINAL_PROCESSING)
}</code>

This code modifies the console mode to enable virtual terminal processing, ensuring that ANSI color escape sequences are parsed and displayed correctly.

Conclusion:

By implementing the above solution, the issue of ANSI colors not working on Windows 10 will be remedied. By enabling virtual terminal processing, your applications can once again display rich colors in the console, regardless of the system or user settings.

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