Compiler error on Windows 7

[TimothyWrightSoftware]

Below is the only smallest example of code that does not compile.
I'm using Windows 7, msvc 2013, SDL 2.0.3.

static void renderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_count) {

}

static const char* ImGui_ImplGlfw_GetClipboardText() {
    return "";
}

static void ImGui_ImplGlfw_SetClipboardText(const char* text) {

}

bool imgui_init() {

    ImGuiIO& io = ImGui::GetIO();
    io.KeyMap[ImGuiKey_Tab] = SDLK_SPACE;                 
    io.RenderDrawListsFn = renderDrawLists;
    io.SetClipboardTextFn = ImGui_ImplGlfw_SetClipboardText;
    io.GetClipboardTextFn = ImGui_ImplGlfw_GetClipboardText;

    return true;
}

The errors are as follows:

imgui.obj : error LNK2019: unresolved external symbol __imp_OpenClipboard referenced in function "char const * __cdecl GetClipboardTextFn_DefaultImpl(void)" (?GetClipboardTextFn_DefaultImpl@@YAPEBDXZ)
imgui.obj : error LNK2019: unresolved external symbol __imp_CloseClipboard referenced in function "char const * __cdecl GetClipboardTextFn_DefaultImpl(void)" (?GetClipboardTextFn_DefaultImpl@@YAPEBDXZ)
imgui.obj : error LNK2019: unresolved external symbol __imp_SetClipboardData referenced in function "void __cdecl SetClipboardTextFn_DefaultImpl(char const *)" (?SetClipboardTextFn_DefaultImpl@@YAXPEBD@Z)
imgui.obj : error LNK2019: unresolved external symbol __imp_GetClipboardData referenced in function "char const * __cdecl GetClipboardTextFn_DefaultImpl(void)" (?GetClipboardTextFn_DefaultImpl@@YAPEBDXZ)
imgui.obj : error LNK2019: unresolved external symbol __imp_EmptyClipboard referenced in function "void __cdecl SetClipboardTextFn_DefaultImpl(char const *)" (?SetClipboardTextFn_DefaultImpl@@YAXPEBD@Z)

I tried to compile with and without #define IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCS but it didn't make a difference.

[ocornut]

Those functions are defined in msvc 2013 " User32.lib " which you need to link into.

IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCS needs to be defined in imconfig.h for it to be seen while compiling imgui.cpp. Is that what you did? It should work and disable the use of those functions.

[TimothyWrightSoftware]

I'm compiling everything by hand, only using cl.exe and vim, so I don't have any win32 stuff in there by default. I will look at the imconfig.h and see if that works.

[ocornut]

Normally user32.lib is linked automatically under Windows unless you ignored the default library or explicitly disabled it. I should probably use a link pragma there (and you can still disable it via imconfig.h)

[TimothyWrightSoftware]

It worked with the two #defines in the imconfig.h. I didn't look at that file at first, because I didn't know there was stuff in there. A quick note in the FAQ would fix this.

[ocornut]

Note that if you are compiling and linking for Windows you are probably better of using the native clipboard facilities rather than disabling it.

I added the linking pragma now. I was already using it for IME input support and nobody reported an issue so it looks like this added one won't be a probelm.

[TimothyWrightSoftware]

Yep, that did it. Added the pragma, took out the #defines, and all is good.

[TimothyWrightSoftware]

Thanks for the quick response!

[ocornut]

Cool. Good to hear!

[ocornut]

FYI, leaving a note here for potential future readers stumbling here:

I have renamed those two defines that are usable (but very rarely used) in imconfig.h
IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCS became IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCTIONS.
IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCS became IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS.

Very few people will be affected and they will likely get a link error and therefore will notice.