How does VB call a DLL function written in C?

1.This will be referenced in the Project References.

aaa as asdfg 'asdfg is the name of the class module.

private sub form_load()dim xset aaa = new asdfg

x = parameter 1, parameter 2).'Parameters 1,2 write end sub yourself, I suggest you understand the following dll production method, and the understanding will be more thorough. The following content is from:

1.Create an ActiveX DLL with the project name vbmytestdll and the class module name mytestdll

2.There is only one function in the class module, which mainly returns the hello world of the dll

public function dlltest1() as string

dlltest1 = "hello world"

end function

3.Save, generate dll, named.

4.Create a new exe project, find it in the menu: Project --- References--- browse, and reference it.

The works are as follows:

option explicit

dim testdll as mytestdll'The name of the class module.

The same. There is a method in the library.

One. Dynamic Link Library (DLL) structure.

There are two types of functions defined in the dll: export functions and intrinsic functions.

internal function), the export function can be called by other modules, and the internal function can only be used inside the dll. When we customize the DLL file in C++, all we need to write is the module definition file (..) that contains the export function tabledef) and a C++ file that implements the export function.

The following is an example of the structure of the def file and the implementation file

1.Module definition file (.)def) is a module used to describe one or more dll attributes.

The first statement must be a library statement, indicating the name of the dll.

The exports statement lists the name of the function to be exported.

You can use the description statement to describe the purpose of the dll (optional).

Optionally, comment on a line

2.Implementation file (..)cpp file as an example).

Implement the entry table function. The CPP file contains API functions and exports for DLL entry point processing.

function.

ibrary is a file that cannot be run on its own, allowing programs to share ** and other resources necessary to perform special tasks.