   can i convert a .NET handle to a win32 HWND?
  thanks...stringa   
  Yes:System.IntPtr   handle = new IntPtr( panelX.Handle.ToInt32() );handle can then be passed on as HWND (to managed C++ for example).   ;  Handle is already IntPtr, no need to cast it to int32 and then back (on x64 it will be wrong).Correct way would be (in C++/CLR):HWND hwnd = (HWND)ctrl->Handle->ToPointer();;  Is there any problems with including un-managed c++ libs with Managed code?  I'm just wondering because I can't seem to link my libraries...thanks,stringa   ;  You'll need to tell us exactly what you're trying to do and what errors you're getting because we can't read your computer screen from here.   ;  I got 34 of these...Error17error LNK2028: unresolved token (0A0000B3) "public: __clrcall quat::quat(float,float,float,float)" (??0quat@@$$FQAM@MMMM@Z) referenced in function "void __clrcall `anonymous namespace'::`dynamic initializer for 'void __clrcall quat_id::A0x604c53a7(void)''(void)" (???__E?A0x604c53a7@quat_id@@YMXXZ@?A0x604c53a7@@$$FYMXXZ)Editor.objI'm trying to link my regular c++ libraries into a WinForms Application.  Basically, I'm creating a level editor for my game and I want to use .NET but still keep it c++.It's like I didn't include the libraries, but i did.  Do I have to use some sort of extern so that It know's how to link the functions?thanks in advance...stringa   ;  Tried to make a post modification but it didn't seem to go through.  The complier is acting like I didn't include the libraries, but I did.  Do I have to define some sort of extern so it knows how to link the functions?thanks,stringa   ;  What type of project are you linking the library with (is it a C++/CLI one, or a C# one?). What type of library is it (pure native, or C++/CLI)?   ;  I've enabled everything as CLR.  Well, this is all the link errors I got left....As you can see, they are all my windows calls : 1 for timeGetTime and 3 for setting up and running openGL in a win32 window.How can I fix this?tia,stringa8>AIEngine.lib(Time.obj) : error LNK2001: unresolved external symbol "extern "C" unsigned long __stdcall timeGetTime(void)" (?timeGetTime@@$$J10YGKXZ)8>GraphicsEngine.lib(GFXEngine.obj) : error LNK2001: unresolved external symbol "extern "C" int __stdcall SetPixelFormat(struct HDC__ *,int,struct tagPIXELFORMATDESCRIPTOR const *)" (?SetPixelFormat@@$$J212YGHPAUHDC__@@HPBUtagPIXELFORMATDESCRIPTOR@@@Z)8>GraphicsEngine.lib(GFXEngine.obj) : error LNK2001: unresolved external symbol "extern "C" int __stdcall ChoosePixelFormat(struct HDC__ *,struct tagPIXELFORMATDESCRIPTOR const *)" (?ChoosePixelFormat@@$$J18YGHPAUHDC__@@PBUtagPIXELFORMATDESCRIPTOR@@@Z)8>GraphicsEngine.lib(GFXEngine.obj) : error LNK2001: unresolved external symbol "extern "C" int __stdcall SwapBuffers(struct HDC__ *)" (?SwapBuffers@@$$J14YGHPAUHDC__@@@Z)[Edited by - stringa on April 27, 2009 2:01:14 PM];  Well, I got everything compiling and linking, I just can't get OpenGL to clear the Panel component.I'm sending opengl a handle to a panel.  I though maybe the panel could be painting over anything opengl does?