OpenEuphoria

Re: Creating DLL's

• Posted by mtsreborn at yahoo.com Feb 27, 2001
• 387 views

--- matthewwalkerlewis at YAHOO.COM wrote:
> 
> Well, I figured out how to create a DLL (and pass
> arbitrary sequences!)
> using Eu/Eu2C (I've been using the PD version).  To
> pass sequences, I used a
> modified version of the (de)compress routines in
> database.e.  I'm sending
> the code to Rob, but here are the basics for
> creating a DLL:
> 
> 1) Change the entry point by creating a function,
> DLLMain. DLLMain can be a
> blank function that returns 1.
> 
> BOOL WINAPI DLLMain(HINSTANCE hDLL,DWORD
> Reason,LPVOID Reserved)
> {
> 
>     return 1;
> };
> 
> 2) Modify WinMain as follows:
> Change the declaration:
> void __declspec(dllexport) Main_(void *hInstance)
> 
> Comment out any references to argc or argv.  These
> refer to command line
> arguments, and shouldn't be used by the DLL.  If
> your code uses command line
> arguments, you'll probably want to create some
> functions to be called to
> replace the command line args.  You'll also need to
> comment out Cleanup(0)
> at the end of WinMain, to allow the DLL to continue.
> 
> 3) Export functions.  You'll need to add
> __declspec(dllexport) to the
> declarations of any functions you want to be called
> from outside the DLL.
> When you import the function to Eu, you'll need to
> add a '_' to the
> beginning:
> 
> If you have:
> int __declspec(dllexport) foo()
> 
> Then in your Eu program:
> bar = define_c_func( dllname, "_foo", {}, C_INT)
> 
> 4) Change the makefile to compile a DLL.  I've only
> done this with Borland.
> You'll need to check the manual of your compiler to
> see how to compile a
> DLL.  The second line of emake.bat will begin:
> 
> @bcc32 -tW ....
> 
> Change this to:
> @bcc32 -tWD ...
> 
> and Borland will compile your code into a DLL.
>   
> 5) You may need to make/remove dummy function calls
> to keep the translator
> from optimizing routines away.  Just comment these
> out as appropriate.
> 
> Matt Lewis 
> 
> 
>
> http://www.topica.com/partner/tag01
>