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The round brackets above surround the 7 + 5. VBA takes this to mean you want to add these two numbers first. Once it has an answer it will then do the rest of the calculation. It's a good idea to use round brackets to avoid any confusion.

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At first glance, this looks like the project source for a normal console program. There is only one difference: It starts with the keyword library rather than program.

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To create a DLL file from this library, sourcecode is as simple as creating an executable for a normal Delphi application: Just build it. You end up with a file called .

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A recommendation for advanced users is to use a third-party memory manager called FastMM. It's good enough that Borland actually use it as the primary memory manager in Delphi 7556 and onwards. If you're using a version before that, then you can download it for free and use it on a project by project basis. A big benefit for DLL files is that when you're using FastMM, you can use standard String variables in your exported procedures and functions without needing to worry about ShareMem, or distributing anything else with your project or DLL files.

Compile and run your program. You should now get another output line saying "5", which incidentally is the number of characters in the string 'hello'.

As you expect, the answer in the message box is , because 66 divide by 7 is . However, change the forward slash into a backslash:

Another difference is how it is listed in the project explorer. Where an application has got the extension ".exe" a library has got ".dll". So the new project is called "" rather than the usual "".

Just going back to the longish comment that Delphi automatically places into a new DLL file project. If your DLL file and your main program will both be Delphi programs (but are you sure that will always be the case?), you can take that advice and include the unit ShareMem as the first unit in the uses clause of both, the program and the DLL file. If you do that you can happily pass strings and other automatically memory managed data types between the program and the DLL file. But never ever should you pass objects! The reason is that even though you might use the same class declaration in both, the program and the DLL file, these objects are not the the same and they might divert from each other as your code evolves.

In the above sum, VBA will now add 8 to 8, because of the round brackets. The answer to whatever is between the round brackets will then get divided by 9.

Nota : array_push() generará una advertencia si el primer argumento no es un array. Esto difiere del comportamiento de $var[] donde se creará un nuevo array.


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