Imgui: Accessing GetIO() before CreateContext() crashes

[DrJedikiah]

Hi, I've updated my dear Imgui version to 1.62 from 1.50 and after I set up everything working, my program crashed and I figured io.IniFilename = NULL causes that.

I've read the documentation on imgui.cpp but I couldn't see anything. Is there anything new about disabling ini setting? Thanks

[ocornut]

If there is a crash please provide a callstack and info about the crash. Thanks!

[DrJedikiah]

Solved with io.IniFilename = ""; instead of NULL

[ocornut]

I don't understand how io.IniFilename = NULL; could possibly make imgui crash and I cannot reproduce it, so would appreciate details from you. If there is an issue on imgui side we should fix it. Thanks.

[DrJedikiah]

I've figured out, issue wasn't the NULL, the issue is; when I was using the old version, I was setting the io outside of any function.
like this and this was the issue but before I figured this was the issue I've move it upside of my io.IniFilename code and then changed NULL to blank quotes and finally I thought issue was solved with quotes but it wasn't.

In a nutshell, I have to init io before everytime I'm gonna use it in a function. I can't use it with only one init.

[ocornut]

In a nutshell, I have to init io before everytime I'm gonna use it in a function. I can't use it with only one init.

Since 1.60 you can only access ImGui::GetIO() once you have created a Context, this is what the assert in GetIO() should have been telling you:

ImGuiIO& ImGui::GetIO()
{
    IM_ASSERT(GImGui != NULL && "No current context. Did you call ImGui::CreateContext() or ImGui::SetCurrentContext()?");
    return GImGui->IO;
}

If you want a global ImGuiIO& io when you can add a global ImGuiContext* ctx = ImGui::CreateContext() before the call to IO but make sure it only exists in 1 compilation unit (not in a header file).