Access violation

[TezzoeR]

Im using the ImGui.net in vb.net and if i try to draw the imgui i get this error

[mellinoe]

Hi @TezzoeR, it's likely that you're calling some of the functions out of order. Can you double check that you are doing things the same way that the example project is, for example?

[itayronen]

Happened to me when I didn't call the ImGuiRenderer.Update(...) function. Example: this.ImGuiRenderer.Update(1f / 60f, snapshot);

[Kein]

Getting the same issue when trying to change the font, using sample project:

 private static unsafe void ChangeFont()
{
    var x = ImGui.GetIO();
    var nativeConfig = ImGuiNative.ImFontConfig_ImFontConfig();
    var config = new ImFontConfigPtr(nativeConfig);
    config.SizePixels = 22f;
    config.OversampleH = config.OversampleV = 1;
    config.PixelSnapH = true;
    _segoe = x.Fonts.AddFontFromFileTTF("segoeui.ttf", 22f, config);
    config.Destroy();
}

ChangeFont();

while (_window.Exists)
{
    //...
    _controller.Update(1f / 60f, snapshot); // newFrame called here

    ImGui.PushFont(_segoe);
    SubmitUI();
    ImGui.PopFont();
}

[oxysoft]

Same problem as Kein, I am unable to a font with nearly exactly the same steps.

[sonoro1234]

Using LuaJIT-imgui bindings, after render

    ig.GetIO().Fonts:Clear()
    ig.lib.ImGui_ImplOpenGL3_DestroyFontsTexture()
    local theFONT
    local fnt_cfg = ig.ImFontConfig()
    fnt_cfg.PixelSnapH = true
    --fnt_cfg.OversampleH = 1
    theFONT= ig.GetIO().Fonts:AddFontFromFileTTF(font, fontsize, fnt_cfg,nil) 
    assert(theFONT ~= nil)
    ig.lib.ImGui_ImplOpenGL3_CreateFontsTexture()
    ig.GetIO().FontDefault = theFONT

The part missing above is ig.lib.ImGui_ImplOpenGL3_DestroyFontsTexture() and ig.lib.ImGui_ImplOpenGL3_CreateFontsTexture() Several issues in this repo are related to Font loading!!

All the above described must be done after Render (not between NewFrame and Render)