DLL

[WP]

Can anyone tell me how to make a dll file?
so i can use it like:


declare function MyFunction lib "MyFunctions" (param1, param2)
Variable1 = MyFunction(param1, param2)


any help appreciated

WP

Make it with Visual C++ 4,5,6 and It will be able to.

I'm sorry, I do NOT know HOW to use VC++ because I'm just starting VC++ after almost pro-forming in VB.

Why did you want to do that? Why can't you use VB DLLs and do it a simpler way, or do you want a FULLY compatable DLL?

all you have to do for VBDLLs are referencing & using.

or you can have a more (I get it) functional DLL from C++, which you MUST have. Otherwise you can ask Megatron, he seems to know C++.

[WP]

But HOW can i do that, can anyone give me a piece of code or something?

WP

I think just ANY C++ function will do. I just started C++, unlike how I excelled at VB, so I can't do anything...

I assume MEGATRON should know this...

Yes, I do know this. Add the follwoing to your C++ DLL.

#include "windows.h"
extern "C" __declspec(dllexport) void _stdcall ExportedMessageBox(HWND hWnd, LPCSTR lpszText)
{
MessageBox(hWnd, lpszText, "Title", MB_OK);
}


Now compile it and add the following to your Form.

Private Declare Function ExportedMessageBox Lib "C:\Program Files\Microsoft Visual Studio\MyProjects\CppDll\Debug\CppDll" Alias "_ExportedMessageBox@8" (ByVal hWnd As Long, ByVal lpszText As String) As Long

Private Sub Command1_Click()
ExportedMessageBox Me.hWnd, "Hello"
End Sub

[WP]

Good!

The only thing is that you did it in c++. And I don't know anything about c++, so I want to write it in vb. You can also make dlls in vb, but i don't now how to make functions(_messagebox@8) there.
Can't you typ in vbscript in c++ ?

WP

That's the problem with VB. It can only create ActiveX DLL's. In order to use a DLL in that respect, you must create a Standard DLL (which VB cannot make hence you use C++).

[parksie]

Also, if you link a .DEF file in, you can change the exported function names:

_ExportedMessageBox@8 becomes ExportedMessageBox


Megatron - I know that C functions have a _ prepended, but is the @8 the total parameter size?

Yes, the @8 is the number of bytes required for the function's arguments as well as the return value.