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C1 control characters break SetConsoleTitleW API #14083

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opened 2026-01-31 04:00:27 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 04:00:27 +00:00
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Originally created by @alabuzhev on GitHub (Jun 2, 2021).

Windows Terminal version (or Windows build number)

1.9.1445.0

Other Software

No response

Steps to reproduce

  • Compile and run the following code:
#include <windows.h>

int main()
{
	if (!SetConsoleTitleW(L"\x80 Spanish Inquisition"))
		return 1;

	MessageBox(0, "I didn't expect that", 0, 0);
}
  • Look at the screen and listen.

Expected Behavior

The title is set.

Actual Behavior

  • Terminal beeps and prints the string on the screen. MSDN doesn't mention any such visual or sound effects.
  • The console title is not set, yet the function returns TRUE.

This is true for other C1 characters as well, not only 0x80.

P.S. The example is not synthetic: these characters can appear in directory and file names and applications can display the current path, the name of the opened file etc. in the console title.

Originally created by @alabuzhev on GitHub (Jun 2, 2021). ### Windows Terminal version (or Windows build number) 1.9.1445.0 ### Other Software _No response_ ### Steps to reproduce - Compile and run the following code: ```C++ #include <windows.h> int main() { if (!SetConsoleTitleW(L"\x80 Spanish Inquisition")) return 1; MessageBox(0, "I didn't expect that", 0, 0); } ``` - Look at the screen and listen. ### Expected Behavior The title is set. ### Actual Behavior - Terminal *beeps* and prints the string *on the screen*. [MSDN](https://docs.microsoft.com/en-us/windows/console/setconsoletitle) doesn't mention any such visual or sound effects. - The console title is not set, yet the function returns TRUE. This is true for other C1 characters as well, not only 0x80. P.S. The example is not synthetic: these characters can appear in directory and file names and applications can display the current path, the name of the opened file etc. in the console title.
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Reference: starred/terminal#14083
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