Crashing when accessing "g_pVGuiSurface" in GMod .dll module

[Phyksar]

Hi, I am trying to port my Lua code to C++ to improve perfomance.

In my visual studio project I have included GMod Lua headers ([url]https://github.com/garrynewman/gmod-module-base[/url]) and Source SDK 2007 headers and libraries. Everything compiles fine, but when this line executes the game crashes.

g_pVGuiSurface->DrawTexturedRect(x, y, x + w, y + h);

As I found out every call to "g_pVGuiSurface" (or "vgui::surface()") makes game to crash.
Other functions like "Msg()" work fine, so I just don't know what goes wrong.

The crash memory dump file information:

Process Name:			hl2.exe : D:\Program Files (x86)\Steam\steamapps\common\GarrysMod\hl2.exe
Process Architecture:		x86
Exception Code:			0xC0000005
Exception Information:		The thread tried to read from or write to a virtual address for which it does not have the appropriate access.
Heap Information:		Not Present

I guess that the headers from Source SDK 2007 may not be suitable for Garrys Mod, but these are the only headers that I've got.

[Jcw87]

For starters, you can get a newer SDK here: [url]https://github.com/ValveSoftware/source-sdk-2013[/url]

Make sure you are actually creating the vgui interface. It's not just gonna appear in that variable by magic.

[Phyksar]

[QUOTE=Jcw87;51179175]For starters, you can get a newer SDK here: [url]https://github.com/ValveSoftware/source-sdk-2013[/url]

Make sure you are actually creating the vgui interface. It's not just gonna appear in that variable by magic.[/QUOTE]

Thanks for the link.
I'm trying to create a function that draws 2d objects on screen (similar to lua analogue "surface.DrawTexturedRect()"). What am I missing?

[Jcw87]

Here's a mockup of what you want.

CDllDemandLoader vguisurface_module("vguimatsurface");

GMOD_MODULE_OPEN() {
	CreateInterfaceFn func = vguisurface_module.GetFactory();
	g_pVGuiSurface = (vgui::ISurface*)func(VGUI_SURFACE_INTERFACE_VERSION, NULL);
	
	// Now you should be able to do stuff with g_pVGuiSurface
}

I haven't tested this. You may need to try other dll names.

[Phyksar]

[QUOTE=Jcw87;51179583]Here's a mockup of what you want.

CDllDemandLoader vguisurface_module("vguimatsurface");

GMOD_MODULE_OPEN() {
	CreateInterfaceFn func = vguisurface_module.GetFactory();
	g_pVGuiSurface = (vgui::ISurface*)func(VGUI_SURFACE_INTERFACE_VERSION, NULL);
	
	// Now you should be able to do stuff with g_pVGuiSurface
}

I haven't tested this. You may need to try other dll names.[/QUOTE]

It worked! Thank you!

Btw, for anyone minding this question in future, if you are compiling using Visual Studio 2015 and getting error "LNK2001 unresolved external symbol __vsnwprintf" you should add "legacy_stdio_definitions.lib" in Configuration Properties -> Linker -> Input -> Additional Dependencies.