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  1. #1
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    C++ unresolved external symbol

    Hello,
    I am new in this world and new in C++ programming, I try to solve a simple problem, I hope. Can you assist me?
    I wrote a minimal C++ program in VS2012 i.e.
    =============
    // vs-cpp : communicate with simconnect in FSX or Prepar3d

    #include <Windows.h>
    #include "SimConnect.h"

    HANDLE hSim = NULL;

    int tmain ()
    {
    HRESULT hr;

    hr = SimConnect_Open (&hSim, "Test", NULL, 0, 0, SIMCONNECT_OPEN_CONFIGINDEX_LOCAL );
    return 0;
    }
    ================
    It is compiling fine with Ctrl-F7
    Building F7 - compiling and linking - gives the error
    LNK2019: unresolved external symbol _SimConnect_Open@24 referenced in function "int __cdecl tmain(void)" (?tmain@@YAHXZ)
    My Properties | Linker | Commandline is:

    ==================
    /OUT:"E:\cpp\06_sim_open\Debug\hello.exe" /MANIFEST /NXCOMPAT /PDB:"E:\cpp\06_sim_open\Debug\hello.pdb" /DYNAMICBASE "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" /DEBUG /MACHINE:X86 /INCREMENTAL /PGD:"E:\cpp\06_sim_open\Debug\hello.pgd" /SUBSYSTEM:CONSOLE /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"Debug\hello.exe.intermediate.manifest" /ERRORREPORT:PROMPT /NOLOGO /LIBPATH:"C:\Program Files (x86)\Windows Kits\8.0\Include\um" /LIBPATH:"G:\Prepar3D v3 SDK 3.2.2.16659\Utilities\SimConnect SDK\lib" /TLBID:1
    ==================
    which includes /LIBPATH:"G:\Prepar3D v3 SDK 3.2.2.16659\Utilities\SimConnect SDK\lib" and in that directory is SimConnect.lib

    I have no idea where to look for a sulution, I searched this forum but was unable to find a hint.
    Thanks in advance.

  2. #2
    2000+ Poster - Never Leaves the Sim kiek's Avatar
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    Re: C++ unresolved external symbol

    Hallo,

    1. Remove that /LIBPATH part.
    2. Put a copy of SimConnect.lib in the same folder as your program.
    3. Add SimConnect.lib in the Additional Options window (select Project properties->Linker->Command Line)

    Groeten,
    Nico
    Last edited by kiek; 05-26-2016 at 01:39 PM.