A (quite) simple ASM compiling question!

Hiya peeps...
Still working on a prog with kedaman (see our Icon question in the General Forums)...

We're currently working on the plugin-mechanism. We'll call Unmanaged (yes that's a .NET term, the core is written in C#) Dll.

The thing is, we're loading the DLL at runtime, and we ran into some problems calling the function... I looked up some stuff on the internet, and came accros this article that describes exactely our problem ( http://www.codeproject.com/csharp/dyninvok.asp )

As you can see, it uses some assembly code to fix the problem of the dynamicly calling of the function... yes, the guy included the source code, but didn't shipped a compiled version of the DLL, only the ASM code and a makefile (+ some test C# code which is inrelevant to the question)...

When I try to compile the code using Visual Studio.NET, I get some compiling errors (something about a namespace and stuff)...

Now could someone please tell me what the problem is with the code, or compile it for me and send the compiled version?

Here's the ASM code I try to compile:

VB Code:

; -------------------------------------------------------------
;
; InvokeFuncAsm - Invokes a function through a function pointer passed as
; the first argument. All other parameters are forwarded on, plus the return
; value of the function invoked is returned.
;
; Copyright (c) Richard Birkby, ThunderMain ltd, November 2001
;
; -------------------------------------------------------------
 
.386
.model flat
 
option prologue:none
option epilogue:none
option dotname
 
 
.code
align DWORD
DllMain     proc    stdcall public, instance:DWORD, reason:DWORD, reserved:DWORD
        mov     eax, 1  ; success
        ret 12
DllMain     endp
 
 
align DWORD
InvokeFunc  proc    stdcall public, funcptr:DWORD
 
    pop ecx ; save return address
    pop edx ; Get function pointer
    push    ecx ; Restore return address
    jmp edx ; Transfer control to the function pointer
InvokeFunc  endp
 
end

Thanks for your Help!

YOu can do this in MSVC^, so it should work in MSVC.NET:

Code:

---

__declspec(naked) InvokeProc(void* func) {
    __asm {
        pop        ecx       
        pop        edx       
        push        ecx       
        jmp        edx
    }
}

---

That should do it. The __declspec(naked) attribute removes the prolog and epilog code from the function, leaving only the asm block, which is what your pure asm function does anyway.

Z.

Wow thanks alot for the quick reply, I'll try it soon..
thanks alot man!

I managed to compile the DLL from pure ASM, someone at another forum pointed out how to use the NMAKE command from the Visual Studio Command Prompt... so there's a sweet 2,5 KB dll now ;)

But thanks alot for your reply!

Try mine anyway... I want to know if it would work =).

Z.

Well I did, but when I tried to use it in C# it said something about that it couldn't find the entry point for that function (eventhough I made a .def file with the appropriate stuff in it)

Thanks for the suggestion though!

Oh well =).

Z.