The project is a Class Library - I am trying to create a dll that I can use in another application.
So really there is no main entry point, and that is why I am puzzled that something tries to link to one.
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Linker error LNK2019: unresolved external symbol _main referenced in function _mainCRTStartup
Hi, I have created a C++ project - a Class Library.
The class is very basic and has just one method:
public __gc class IMLibrary
{
void TestMethod();
};
I'm including the header files:
#include <stdio.h>
#include <math.h>
#include "stdafx.h"
#include "IMLibrary.h"
and the method uses sin, cos, and sqrt. All of these give linker errors. I am obviously missing something.
I also get the linker error:
error LNK2019: unresolved external symbol _main referenced in function _mainCRTStartup
Ultimately I'm trying to write a dll that will access some .lib files that I have, and then call this from a .NET file, but for some reason I can't even get past a simple function call!
Thanks.
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Answers
The following article explains what happens in your case (using CRT functions in managed C++ class library) and describes how to fix this:
http://support.microsoft.c
However, the better way is to replace unmanaged math.h with managed Math class. There is no need for using CRT in managed C++ project. Remove also stdio.h, all functions that you use from it are available in .NET.
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by: jaime_olivaresPosted on 2005-06-09 at 09:54:41ID: 14181582
Where is your main function? Has you created as a console application?
I suggest you to create a new Project in Visual C++, and specify console application (prefereable a Hello World application), and put your code on it.