error LNK2019 unresolved external symbol main referenced in function tmainCRTStartup

Question

I don t know what s wrong with it   I can t find where the error is  commenting out the implementation doesn t resolve the error either   Header File   ifndef MAIN SAVITCH SEQUENCE H  define MAIN SAVITCH SEQUENCE H  include  lt cstdlib gt      Provides size t  namespace main savitch 3       class sequence           public             TYPEDEFS and MEMBER CONSTANTS         typedef double value type          typedef std  size t size type          static const size type CAPACITY   30             CONSTRUCTOR         sequence                MODIFICATION MEMBER FUNCTIONS         void start             void advance             void insert const value type amp  entry           void attach const value type amp  entry           void remove current                CONSTANT MEMBER FUNCTIONS         size type size    const          bool is item    const          value type current    const      private          value type data CAPACITY           size type used          size type current index             endif   Source   include  sequence1 h   include  lt assert h gt   namespace main savitch 3           Default constructer - sequence is empty     sequence  sequence                 used   current index   0                 Start the iteration     void sequence  start                 current index   0               Iterate     void sequence  advance                 current index                   Number of items in the sequence     sequence  size type sequence  size   const               return used               Checks if there is a current item     bool sequence  is item   const               return current index  lt   used  amp  amp  used  gt  0               Returns the current value     sequence  value type sequence  current   const               assert is item        no current item         return data current index                  Adds an item BEFORE the current index     void sequence  insert const value type amp  entry                assert entry    0      pointer is invalid         assert current index  lt  sequence  CAPACITY      no room to add an item             move items up - starting with the last item and working down to the current item            arrays start at 0  so the -1 adjusts it         for  size type i   used - 1  i  gt   current index  i--              data i   1    data i            data current index    entry               Adds an item AFTER the current index     void sequence  attach const value type amp  entry                assert entry    0      pointer is invalid         assert current index  lt  sequence  CAPACITY      no room to add an item             move items up - starting with the last item and working down to the current item            arrays start at 0  so the -1 adjusts it         for  size type i   used - 1  i  gt  current index  i--              data i   1    data i            if  current index   0              data used    entry          else             data current index   1    entry               Removes the current item     void sequence  remove current                 for  size type i   current index  i  lt  used  i                data i    data i   1

User · Answer

In case someone missed the obvious  note that if you build a GUI application and use  -subsystem windows  in the link-args  the application entry is WinMain 16  Not main    Hence you can use this snippet to call your main      include  lt stdlib h gt   include  lt windows h gt    ifdef   GNUC    define  stdcall    attribute    stdcall    endif  int  stdcall WinMain  struct HINSTANCE    hInstance           struct HINSTANCE    hPrevInstance           char                lpszCmdLine           int                 nCmdShow      return main    argc    argv

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Even if your project has a main   method  the linker sometimes gets confused  You can solve this issue in Visual Studio 2010 by going to     Project -  Properties -  Configuration Properties -  Linker -  System   and changing SubSystem  to Console

User · Answer

Did you implement the main   function   int main int argc  char   argv            code         return 0       edit   You have your main   in another source file so you ve probably forgotten to add it to your project   To add an existing source file  In Solution Explorer  right-click the Source Files folder  point to Add  and then click Existing Item  Now select the source file containing the main

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if you have  tmain function in your projects you need to include  lt tchar h gt

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I encountered the LNK2019 error while working on a DLL project in Visual Studio 2013   I added a new configuration to the project  But instead of having the  Configuration Type  as  Dynamic Library   visual studio added it as  Application   This resulted in the LNK2019 error   Fixed the LNK2019 error by going to Project -  Properties -  Configuration Properties -  General and changing  Configuration Type  to  Dynamic Library   dll   and  Target Extension  to   dll    Yes  the original question talks about a console application project  which is a different problem than my answer  But I believe adding this answer might help someone  like me  that stumbles upon this thread

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go to  Project-Properties-Configuration Properties-Linker-input-Additional dependencies  then go to the end and type   ws2 32 lib

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You need a main   function so the program knows where to start

User · Answer

You appear to have no main function  which is supposed to be the entry-point for your program

User · Answer

If you are using Visual Studio  The reason you might be recieving this error may be because you originally created a new header file h  and then renamed it to file cpp where you placed your main   function    To fix the issue right click file cpp -  click Properties  go to Configuration Properties -  General  - Item Type  and change its value to  C C   compiler   instead of   C C   header

User · Answer

try using return 0  if it keeps failing change your solution platform to 64x instead of 86x and go to configuration manager that s were you change the 86x to 64x  and in platform set it to 64 bits that works for me  hope it work to you

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I had this problem despite    having a main    and configuring all other projects in my solution to be static libraries    My eventual fix was the following    my main   was in a namespace  so was effectively called something  main      removing this namespace fixed the problem

User · Answer

We also had this problem  My colleague found a solution  It turned up to be a redefinition of  main  in a third party library header    define main    SDL main   So the solution was to add    undef main   before our main function    This is clearly a stupidity

[c++] error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup

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