error LNK2019: unresolved external symbol _WinMain

问题:

While I am running the simple code as below I have two errors as following:

#include <iostream>
#include <string>
using namespace::std;

template <class Type>
class Stack
{
public:
    Stack (int max):stack(new Type[max]), top(-1), maxsize(max){}
    ~Stack (void) {delete []stack;}
    void Push (Type &val);
    void Pop (void) {if (top>=0) --top;}
    Type& Top (void) {return stack[top];}
    //friend ostream& operator<< (ostream&, Stack&);
private:
    Type *stack;
    int top;
    const int maxSize;
};

template <class Type>
void Stack <Type>:: Push (Type &val)
{
    if (top+1<maxsize)
        stack [++top]=val;
}

Errors:

MSVCRTD.lib(crtexew.obj) : error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup

What Should I do?

回答1:

Thats a linker problem.

Try to change Properties -> Linker -> System -> SubSystem (in Visual Studio).

from Windows (/SUBSYSTEM:WINDOWS) to Console (/SUBSYSTEM:CONSOLE)

This one helped me

回答2:

As the others mentioned you can change the SubSystem to Console and the error will go away.

Or if you want to keep the Windows subsystem you can just hint at what your entry point is, because you haven\'t defined ___tmainCRTStartup. You can do this by adding the following to Properties -> Linker -> Command line:

/ENTRY:\"mainCRTStartup\"

This way you get rid of the console window.

回答3:

If you are having this problem and are using Qt - you need to link qtmain.lib or qtmaind.lib

回答4:

Include <tchar.h> which has the line:

#define _tWinMain wWinMain

回答5:

If you use Unicode Character Set, but the entry wasn\'t set, you can specify /ENTRY:\"wWinMainCRTStartup\"

回答6:

Besides changing it to Console (/SUBSYSTEM:CONSOLE) as others have said, you may need to change the entry point in Properties -> Linker -> Advanced -> Entry Point. Set it to mainCRTStartup.

It seems that Visual Studio might be searching for the WinMain function instead of main, if you don\'t specify otherwise.

回答7:

i don\'t see the main function.

please make sure that it has main function.

example :

int main(int argc, TCHAR *argv[]){

}

hope that it works well. :)

回答8:

If your project is Dll, then the case might be that linker wants to build a console program. Open the project properties. Select the General settings. Select configuration type Dynamic Library there(.dll).

回答9:

Your tried to turn that source file into an executable, which obviously isn\'t possible, because the mandatory entry point, the main function, isn\'t defined. Add a file main.cpp and define a main function. If you\'re working on the commandline (which I doubt), you can add /c to only compile and not link. This will produce an object file only, which needs to be linked into either a static or shared lib or an application (in which case you\'ll need an oject file with main defined).

_WinMain is Microsoft\'s name for main when linking.

Also: you\'re not running the code yet, you are compiling (and linking) it. C++ is not an interpreted language.

回答10:

I\'m not sure where to post this answer of mine but I think it\'s the right place. I came across this very error today and switching the subsystems didn\'t change a thing.

Changing the 64bit lib files to 32bit (x86) did the trick for me, I hope it will help someone out there !

回答11:

If you are using CMake, you can also get this error when you set SET(GUI_TYPE WIN32) on a console application.