Visual C++ and MFC Programming 2nd Edition

Index Visual C++ and MFC Fundamentals

LPVOID lpReserved

)

{

return TRUE;

}

double MOIRectangle(double b, double h)

{

return b * h * h * h / 3;

}

double MOISemiCircle(double r)

{

const double PI = 3.14159;

return r * r * r * r * PI / 8;

}

double MOITriangle(double b, double h, int)

{

return b * h * h * h / 12;

}

8. To create the DLL, on the main menu, click Build -> Build MomentOfInertia


9. Open Windows Explorer and open the Debug folder of the current project. Notice
   that a file with dll extension and another file with lib extension have been created

22.4.3..Win32 DLL Test..................................................................................

Naturally you should test your DLL to make sure it behaves as expected, before

distributing it to other applications. For an application to be able to use the DLL, it must

be able to locate its dll and its lib files. The simplest way to do this is to simply copy and

paste these files in the client project. Some other times, the DLL and its library will need

to reside in the system directory. To make the DLL available to an application, you must

import the DLL into the application. Although there are various ways to do this, the

simplest consists of adding it to the project by using the main menu where you would

click Project -> Add Existing Item..., and selecting the lib file.

We mentioned that, when creating the DLL, you should use the _declspec(dllexport)

modifier for each function that will be accessed outside of the DLL. In the project that is

using the DLL, each function that will be accessed must be declared using the

_declspec(dllimport) modifier.

Practical Learning: Testing a DLL

1. To start a new project, display the New Project dialog box


2. In the Project Types, click Visual C++ Projects. In the Templates, click MFC
   Application


3. In the Name edit box, type MOITest and press Enter


4. In the MFC Application Wizard, create the application as Dialog Based without an
   About Box and set the Dialog Title to Moment Of Inertia DLL Test


5. Click Finish