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06.09.2005 at 09:30AM PDT, ID: 21452684
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Linker error LNK2019: unresolved external symbol _main referenced in function _mainCRTStartup

Tags: external, unresolved, symbol, error, _main
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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Question Stats
Zone: Programming
Question Asked By: Daeljan
Solution Provided By: AlexFM
Participating Experts: 2
Solution Grade: A
Views: 423
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06.09.2005 at 09:54AM PDT, ID: 14181582

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06.09.2005 at 10:25AM PDT, ID: 14181859

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06.09.2005 at 10:28AM PDT, ID: 14181884

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06.09.2005 at 10:37AM PDT, ID: 14181952

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06.09.2005 at 10:46AM PDT, ID: 14182030

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06.09.2005 at 10:48PM PDT, ID: 14185890

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06.10.2005 at 02:21AM PDT, ID: 14186694

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06.09.2005 at 09:54AM PDT, ID: 14181582

Rank: Guru

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.
 
06.09.2005 at 10:25AM PDT, ID: 14181859
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.
 
06.09.2005 at 10:28AM PDT, ID: 14181884
Aside from the main entry point issue, can you shed some light on the linker error regarding the maths calls to cos, sin, and sqrt?
 
06.09.2005 at 10:37AM PDT, ID: 14181952

Rank: Guru

Of course there is an entry point, every dll has an entry point (usually called DllMain), then create a new project, DLL type.
 
06.09.2005 at 10:46AM PDT, ID: 14182030
I am using Visual Studio.NET. I looked for the options to create a traditional dll, and I haven't been able to find one.

However, if you create a .NET assembly, there is no DllMain.
 
06.09.2005 at 10:48PM PDT, ID: 14185890

Rank: Wizard

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.com/?id=814472

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.
Accepted Solution
 
06.10.2005 at 02:21AM PDT, ID: 14186694

Thanks Alex, that put me back on track.

Everything compiles and links cleanly, and it tests out ok.

All the best
 
 
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