Unresolved External Symbol

Compiling or Editing the Panda Source
1

I"m just trying to get my hello world example, but I’m getting linker errors:

Error
1	error LNK2001: unresolved external symbol "public: void __thiscall PandaFramework::open_framework(int &,char * * &)" (?open_framework@PandaFramework@@QAEXAAHAAPAPAD@Z)	main.obj	PandaTest
Error	2	error LNK2001: unresolved external symbol "public: virtual __thiscall PandaFramework::~PandaFramework(void)" (??1PandaFramework@@UAE@XZ)	main.obj	PandaTest
Error	3	error LNK2001: unresolved external symbol "public: __thiscall PandaFramework::PandaFramework(void)" (??0PandaFramework@@QAE@XZ)	main.obj	PandaTest
Error	4	fatal error LNK1120: 3 unresolved externals	C:\Documents and Settings\mike\My Documents\Visual Studio 2008\Projects\PandaTest\Release\PandaTest.exe	PandaTest

I have C:\Panda3D-1.5.4\lib included as a library directory. Should this not provide the needed definitions?

This is the code that is crashing:

#include "pandaFramework.h"
#include "pandaSystem.h"

PandaFramework g_Framework;

int main(int argc, char* argv[])
{
	g_Framework.open_framework(argc, argv);

	return 0;
}
2

This is defined in libp3framework.lib. You need to add that library to your project. Probably wouldn’t hurt to add all of the libraries in that directory.

David

3

That fixed it. Thanks!

4

Now I’m getting another unresolved external error when I declare a NodePath. I included C:\Panda3D-1.5.4\lib*.*. Am I still missing something? Is there maybe a list of all required libraries and headers I can use to ensure I have everything?

5

What is the unresolved symbol?

David

6

That would probably be a helpful piece of information…

Error	1	error LNK2001: unresolved external symbol "private: static class TypeHandle ReferenceCount::_type_handle" (?_type_handle@ReferenceCount@@0VTypeHandle@@A)	main.obj	PandaTest
Error	2	error LNK2001: unresolved external symbol "private: static class TypeHandle CachedTypedWritableReferenceCount::_type_handle" (?_type_handle@CachedTypedWritableReferenceCount@@0VTypeHandle@@A)	main.obj	PandaTest
Error	3	error LNK2001: unresolved external symbol "private: static class TypeHandle TypedWritableReferenceCount::_type_handle" (?_type_handle@TypedWritableReferenceCount@@0VTypeHandle@@A)	main.obj	PandaTest
Error	4	error LNK2001: unresolved external symbol "private: static class TypeHandle PandaNode::_type_handle" (?_type_handle@PandaNode@@0VTypeHandle@@A)	main.obj	PandaTest
Error	5	error LNK2001: unresolved external symbol "class MemoryHook * memory_hook" (?memory_hook@@3PAVMemoryHook@@A)	main.obj	PandaTest
Error	6	error LNK2001: unresolved external symbol "private: static class TypeHandle CopyOnWriteObject::_type_handle" (?_type_handle@CopyOnWriteObject@@0VTypeHandle@@A)	main.obj	PandaTest
Error	7	error LNK2001: unresolved external symbol "private: static class TypeHandle TypeHandle::_none" (?_none@TypeHandle@@0V1@A)	main.obj	PandaTest
Error	8	error LNK2001: unresolved external symbol "private: static class TypeHandle PandaNode::CData::_type_handle" (?_type_handle@CData@PandaNode@@0VTypeHandle@@A)	main.obj	PandaTest
Error	9	error LNK2001: unresolved external symbol "private: static class TypeHandle TypedObject::_type_handle" (?_type_handle@TypedObject@@0VTypeHandle@@A)	main.obj	PandaTest
Error	10	error LNK2001: unresolved external symbol "private: static class TypeHandle TypedWritable::_type_handle" (?_type_handle@TypedWritable@@0VTypeHandle@@A)	main.obj	PandaTest
Error	11	error LNK2001: unresolved external symbol "private: static class TypeHandle NodePathComponent::_type_handle" (?_type_handle@NodePathComponent@@0VTypeHandle@@A)	main.obj	PandaTest
Error	12	error LNK2001: unresolved external symbol "private: static class TypeHandle NodePathComponent::CData::_type_handle" (?_type_handle@CData@NodePathComponent@@0VTypeHandle@@A)	main.obj	PandaTest
Error	13	fatal error LNK1120: 12 unresolved externals	C:\Documents and Settings\mike\My Documents\Visual Studio 2008\Projects\PandaTest\Release\PandaTest.exe	PandaTest
7

It looks to me like you failed to define the WIN32_VC symbol when you were compiling. This is required to tell Panda to emit the syntax required to import these symbols from the DLL (Windows requires a special extended syntax to import symbols, for some reason, instead of sensibly importing all external symbols like other OS’s do).

David

8

Oh. I don’t recall seeing steps to do that. Perhaps I missed it in a tutorial somewhere? I don’t see it in the getting started stuff, or the Hello World tutorial. How might I do this?

9

Hmm, I’m sure we used to have a “how to compile Panda on Visual Studio” page, but it seems to be gone. Maybe someone took it down because it had gotten out-of-date or something, and it hasn’t been replaced yet.

Just add WIN32_VC to the list of defined symbols in the project settings.

David

10

Yeah, Josh removed it. Here’s a link to the old page:
panda3d.org/manual/index.php?title … oldid=4381

If I get more time, I’ll work on C++ samples and ship VC projects with em.

11

That fixed it. Thanks!