Error LNK2019 unresolved external symbol main referenced in function int cdecl invoke main void invoke main YAHXZ

Question

Error  Severity Code Description Project File Line Error LNK2019 unresolved external symbol  main referenced in function  quot int   cdecl invoke main void  quot    invoke main  YAHXZ   Severity    Code    Description Project File    Line Error   LNK1120 1 unresolved externals    Code   include  quot windows h quot   include  quot tchar h quot   include  quot d3d9 h quot   pragma comment lib   quot d3d9 lib quot    LPDIRECT3D9 pDirect3D NULL   LPDIRECT3DDEVICE9 pDirect3DDevice NULL   const int segment   50  const int NV   segment 13  struct CUSTOMVERTEX      float x  y  z  rhv         DWORD color      define D3DFVF CUSTOMVERTEX  D3DFVF XYZRHW D3DFVF DIFFUSE   LPDIRECT3DVERTEXBUFFER9 pVertexBuffer NULL    HRESULT InitialDirect3D HWND hvnd       if  pDirect3D Direct3DCreate9 D3D SDK VERSION    NULL        return E FAIL     D3DDISPLAYMODE Display      if FAILED pDirect3D- gt GetAdapterDisplayMode D3DADAPTER DEFAULT   amp Display          return E FAIL      D3DPRESENT PARAMETERS Direct3DParameter     ZeroMemory  amp Direct3DParameter  sizeof Direct3DParameter        Direct3DParameter Windowed TRUE     Direct3DParameter SwapEffect D3DSWAPEFFECT DISCARD     Direct3DParameter BackBufferFormat Display Format      if FAILED pDirect3D- gt CreateDevice D3DADAPTER DEFAULT  D3DDEVTYPE HAL  hvnd                                       D3DCREATE HARDWARE VERTEXPROCESSING                                        amp Direct3DParameter   amp pDirect3DDevice          return E FAIL     return S OK    HRESULT RenderingDirect3D        if pDirect3DDevice  NULL        return E FAIL     pDirect3DDevice- gt Clear 0  NULL  D3DCLEAR TARGET  D3DCOLOR XRGB 90  150  100   1 f  0          pDirect3DDevice- gt BeginScene        pDirect3DDevice- gt SetStreamSource 0  pVertexBuffer  0  sizeof CUSTOMVERTEX          pDirect3DDevice- gt SetFVF D3DFVF CUSTOMVERTEX           pDirect3DDevice- gt DrawPrimitive D3DPT LINELIST  0  NV       pDirect3DDevice- gt EndScene        pDirect3DDevice- gt Present NULL  NULL  NULL  NULL       return S OK     void DeleteDirect3D        if pVertexBuffer         pVertexBuffer- gt Release       if pDirect3DDevice         pDirect3DDevice- gt Release       if pDirect3D         pDirect3D- gt Release       HRESULT InitialVertexBuffer         float u   0 0      int z   0      float points   2               150 150            125 100            150 50            200 50            225 55            285 60            325 25                     342 30            340 35            340 40                 325 75            300 125            300 175            305 250            295 287            257 347            200 350            150 325            140 290             142 282            160 280            165 286                     175 325            215 340            250 335            275 300            275 250            255 200            250 150            275 100            305 65                     275 85            240 95            215 85            170 65            140 90            160 135             160 150            152 5 150            150 150                      CUSTOMVERTEX Vertexes NV 2       int i   0      while  i  lt  NV 2                 u   0 f          for int j   0  j  lt  segment  j                          Vertexes i  x    1-3 u 3 u u-u u u  points z  0   3 u-6 u u 3 u u u  points z 1  0   3 u u-3 u u u  points z 2  0   u u u  points z 3  0               Vertexes i  y    1-3 u 3 u u-u u u  points z  1   3 u-6 u u 3 u u u  points z 1  1   3 u u-3 u u u  points z 2  1   u u u  points z 3  1               Vertexes i  z   0 5f              Vertexes i  color   0x00ffffff              Vertexes i  rhv   1 f              u     float 1 segment              i                Vertexes i  x    1-3 u 3 u u-u u u  points z  0   3 u-6 u u 3 u u u  points z 1  0   3 u u-3 u u u  points z 2  0   u u u  points z 3  0               Vertexes i  y    1-3 u 3 u u-u u u  points z  1   3 u-6 u u 3 u u u  points z 1  1   3 u u-3 u u u  points z 2  1   u u u  points z 3  1               Vertexes i  z   0 5f              Vertexes i  color   0x00ffffff              Vertexes i  rhv   1 f              i                      z    3                if FAILED pDirect3DDevice- gt CreateVertexBuffer NV 2 sizeof CUSTOMVERTEX   0  D3DFVF CUSTOMVERTEX          D3DPOOL DEFAULT   amp pVertexBuffer  NULL                return E FAIL         void  pVB NULL     if FAILED pVertexBuffer- gt Lock 0  sizeof Vertexes   void    amp pVB  0          return E FAIL      memcpy pVB  Vertexes  sizeof Vertexes          pVertexBuffer- gt Unlock           return S OK     LRESULT CALLBACK MainWinProc HWND hwnd                                UINT msg                               WPARAM wparam                                LPARAM lparam        switch msg             case WM PAINT              RenderingDirect3D                ValidateRect hwnd  NULL               break        case WM DESTROY              DeleteDirect3D                PostQuitMessage 0               return 0          return DefWindowProc hwnd  msg  wparam  lparam      int WINAPI WinMain HINSTANCE hinstance                     HINSTANCE hprevinstance                     LPSTR lpcmdline                      int ncmdshow        WNDCLASSEX windowsclass     HWND hwnd      MSG msg            windowsclass cbSize sizeof WNDCLASSEX      windowsclass style CS DBLCLKS CS OWNDC CS HREDRAW CS VREDRAW     windowsclass lpfnWndProc MainWinProc     windowsclass cbClsExtra 0     windowsclass cbWndExtra 0     windowsclass hInstance hinstance     windowsclass hIcon LoadIcon NULL  IDI APPLICATION      windowsclass hCursor LoadCursor NULL  IDC ARROW      windowsclass hbrBackground  HBRUSH GetStockObject GRAY BRUSH      windowsclass lpszMenuName NULL     windowsclass lpszClassName  T  quot WINDOWSCLASS quot       windowsclass hIconSm LoadIcon NULL  IDI APPLICATION          if  RegisterClassEx  amp windowsclass         return 0         if   hwnd CreateWindowEx        NULL         T  quot WINDOWSCLASS quot            T  quot Desenam litera G quot           WS OVERLAPPEDWINDOW WS VISIBLE         CW USEDEFAULT  0         CW USEDEFAULT  0         NULL         NULL         hinstance         NULL           return 0      if SUCCEEDED InitialDirect3D hwnd               if SUCCEEDED InitialVertexBuffer                      ShowWindow hwnd  SW SHOWDEFAULT             UpdateWindow hwnd             ZeroMemory  amp msg  sizeof msg            while msg message  WM QUIT                         if PeekMessage  amp msg  NULL  0  0  PM REMOVE                                TranslateMessage  amp msg                  DispatchMessage  amp msg                             else                RenderingDirect3D                                return msg wParam

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If you use CMake you have to set WIN32 flag in add executable  add executable   name  WIN32   source files     See CMake Doc for more information

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Solution for me is  I clean both the solution and the project  And just rebuild the project  This error happens because I tried to delete the main file  only keep library files  in the previous build so at the current build the old stuff is still kept in the built directory  That s why unresolved things happened   unresolved external symbol  main referenced in function  int   cdecl invoke main void     invoke main  YAHXZ

User · Answer

just add   int main           you can leave it empty     return 0      to your project and everything will work its causes  because of visual studio try to find the main function to start the project and didn t found it

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If it is a windows system  then it may be because you are using 32 bit winpcap library in a 64 bit pc or vie versa  If it is a 64 bit pc then copy the winpcap library and header packet lib and wpcap lib from winpcap lib x64 to the winpcap lib directory and overwrite the existing

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I had to  include  lt tchar h gt  in my windows service application  I left it as a windows console type subsystem  The  quot Character Set quot  was set to UNICODE

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I faced the same problem too and I found out that I selected  new Win32 application  instead of  new Win32 console application   Problem solved when I switched  Hope this can help you

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Old thread but for me it started working  after following all advise above  when i renamed int main void  to int wmain void  and removed WIN23 from cmake s add executable

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Select the project  Properties- Configuration Properties- Linker- System   My problem solved by setting below option  Under System  SubSystem   Console  SUBSYSTEM CONSOLE   Or you can choose the last option as  inherite from the parent

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This is an edge case  but you can also get this error if you are building an MFC application with CMake   In that case  you need to add the following definitions    ADD DEFINITIONS -D AFXDLL  SET CMAKE MFC FLAG 2    or 1 if you are looking for the static library   If you are compiling with unicode  the following properties also need to be added    set target properties MyApp PROPERTIES     COMPILE DEFINITIONS      AFXDLL  UNICODE UNICODE  BIND TO CURRENT CRT VERSION  BIND TO CURRENT MFC VERSION     LINK FLAGS   ENTRY   wWinMainCRTStartup        Soure  FAQ  How to use MFC with CMake

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This worked for me    I don t have enough rep to embed pictures yet -- sorry about this    I went into Project --  Properties --  Linker --  System   IMG  Located here  as of Dec 2019 Visual Studio for Windows  My platform was set to Active Win32  with the Subsystem as  Windows   I was making a console app  so I set it to  Console    IMG  Changing  Windows  --   Console   Then  I switched my platform to  x64    IMG  Switched my platform from Active 32  to x64

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I got the same error because I created a new object from a templated class using the template name without specifying the type explicitly like this  int main          MyClass lt T gt  Test2 5 60  6 6    lt - This is wrong                    return 0     The correct way to do it was to specify exactly what T was like this  int main          MyClass lt double gt  Test2 5 60  6 6    lt - This is right                        return 0

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I deleted the file with main   function in my project when I wanted to change project type to static library  I Forgot to change Properties - gt  General - gt  Configuration Type from Application  exe  to Static Library   lib  This too gave me the same error

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The problem might originate from a macro instruction in SDL main h In that macro your main     is renamed to SDL main     because SDL needs its own main     on some of the many platforms they support  so they change yours  Mostly it achieves their goal  but on my platform it created problems  rather than solved them  I added a 2nd line in SDL main h  and for me all problems were gone   define main SDL main      Original line  Renames main     to SDL main         define main main          Added line  Undo the renaming   If you don t like the compiler warning caused by this pair of lines  comment both lines out  If your code is in WinApp     you don t have this problem at all  This answer only might help if your main code is in main     and your platform is similar to mine  I have  Visual Studio 2019  Windows 10  x64  writing a 32 bit console app that opens windows using SDL2 0 as part of a tutorial

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I had same Problem when i was trying to create executable from program that having no main   method  When i included sample main   method like this  int main      return 0      It solved

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Check project configuration  Linker- System- SubSystem should be Windows

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Similar to      I had the wrong application type configured for a dll  I guess that the project type changed due to some bad copy pasting  as  Daniel Struhl suggested   How to verify  Right click on the project -  properties -  Configuration Properties -  General -  Project Defaults -  Configuration Type   Check if this field contains the correct type  e g   Dynamic Library   dll   in case the project is a dll

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Right click on project  Properties- Configuration Properties- General- Linker   I found two options needed to be set  Under System  SubSystem   Windows   SUBSYSTEM WINDOWS  Under Advanced  EntryPoint   main

[c++] Error LNK2019 unresolved external symbol _main referenced in function "int __cdecl invoke_main(void)" (?invoke_main@@YAHXZ)

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