Imgui: Chinese supports issues...

Created on 1 Aug 2019 · 9Comments · Source: ocornut/imgui

I am chinese and always use imgui.When I updated Visual Studio to the latest version this morning, the code reported errors.

ImGui::Text(u8"颜色(Color)");

This code works fine before Visual Studio version 16.2.0,But it doesn't works after I updated it this morning.

The wrong:
Including Chinese: error C2664: “void ImGui::Text(const char *,...)”: 无法将参数 1 从“const char8_t [7]”转换为“const char *”

English:void ImGui::Text(const char *,...)”: Cannot convert parameter 1 from "const char8_t [7]" to "const char *"

Maybe code error related to imgui

fontext

Source

JustinLatiao

Most helpful comment

It's not ImGui related . char8_t is a distinct type introduced by C++20 (but ImGui depends on lower C++ standard) , it's not equivalent to char . https://stackoverflow.com/questions/56833000/c20-with-u8-char8-t-and-stdstring

I think using UTF-8 as the default charset of the project would be more portable than u8 string literal. You can add an UTF-8 BOM to your source file (Or add an option /utf-8 in the command line) to let Microsoft C++ compiler know it's UTF-8 encoding . https://devblogs.microsoft.com/cppblog/new-options-for-managing-character-sets-in-the-microsoft-cc-compiler/ And it is compatible with other C++ compilers.

cloudwu on 6 Aug 2019

👍3

All 9 comments

In addition, my project compiles normally when I delete "u8". However, after deleting "u8", Chinese cannot be displayed normally

JustinLatiao on 1 Aug 2019

Hi, not sure exactly why that is happening but I just tried using the latest ImGui version and also VS 16.2 and I can build that code

ImGui::Text(u8"颜色(Color)");

If I remove the u8 like you said I can still build but I get a build warning.

The Chinese characters aren't showing but that's probably the font I have not supporting it, but I get no build errors.

I don't think this is ImGui related, did VS updated recently or something? Maybe related to the Character Set (unicode, multi-byte, etc) you choose for the build? A sure way to be sure would be to rollback ImGui to the last version you were sure it worked and try that code again, if it works now we know, if it still doesn't work it's something else. Sorry I can't help more without more info.

DJLink on 2 Aug 2019

Hi, not sure exactly why that is happening but I just tried using the latest ImGui version and also VS 16.2 and I can build that code
ImGui::Text(u8"颜色(Color)");
If I remove the u8 like you said I can still build but I get a build warning.

The Chinese characters aren't showing but that's probably the font I have not supporting it, but I get no build errors.

I don't think this is ImGui related, did VS updated recently or something? Maybe related to the Character Set (unicode, multi-byte, etc) you choose for the build? A sure way to be sure would be to rollback ImGui to the last version you were sure it worked and try that code again, if it works now we know, if it still doesn't work it's something else. Sorry I can't help more without more info.

Hello,I've changed the C++ language standard.When I change std:c++latest to std:c++17, the project compiles properly.But does compiling like this have any bad effects?

JustinLatiao on 2 Aug 2019

Hello,I've changed the C++ language standard.When I change std:c++latest to std:c++17, the project compiles properly.But does compiling like this have any bad effects?

"std:c++ latest" is using a preview version of what will be c++ 20 (working draft), which is not fully compatible yet with most compilers. c++17 is the latest c++ revision that majority of compilers should be compatible now, so you should be fine.

DJLink on 2 Aug 2019

Hello,I've changed the C++ language standard.When I change std:c++latest to std:c++17, the project compiles properly.But does compiling like this have any bad effects?

"std:c++ latest" is using a preview version of what will be c++ 20 (working draft), which is not fully compatible yet with most compilers. c++17 is the latest c++ revision that majority of compilers should be compatible now, so you should be fine.

Thank you for your kind help.Another warm-hearted friend offered me a piece of advice.

Add /Zc:char8_t- option to compiler command line.

But I don't know where it compiler command line in the project property in Chinese.I tried to ask this question in Chinese programming BBS,but they don't seem to know.If convenient, can you mark its location in the project properties and take a screenshot?Millions of thanks!

JustinLatiao on 2 Aug 2019