Inline assembly

For some reason the assembly i learned wont work as inline in Visual C++. Could someone post a link to a tutorial or an example or a reason why it wont work. Thanks.

Anyone?

Could you post your assembly code so we can see what isn't working.

Hmm...don't use the inline keyword...

Code:

---

long myfunc(long in) {
    __asm {
        mov eax, in
    }
}

---

That just returns the supplied value.

This line would create an error...

Code:

---

_asm    mov    hAppInstance, hInstance

---

Try:

Code:

---

push ebx
mov ebx, hInstance
mov hAppInstance, ebx
pop ebx

---

There probably isn't a direct path from memory->memory like that (I don't know).

That worked, so apparently everything i learned in ASM for Windows, is crap. So as an example for me could someone turn this piece of code into ASM for me? Thanks.

Code:

---

while(GetMessage(&Msg, NULL, 0, 0))
{                       
        if(doit == 1)
        {                                       
                GetCursorPos(&Mouse2);                               
                if(Mouse2.x != Mouse.x || Mouse2.y != Mouse.y)
                {
                        GetCursorPos(&Mouse);
                        Window = WindowFromPoint(Mouse);
                        Window = ChildWindowFromPoint(Window, Mouse);
                        Hdc = GetWindowDC(Window);
                                                                                               
                        Colors = GetPixel(Hdc, Mouse.x, Mouse.y);

                        Red = GetRValue(Colors);
                        Green = GetGValue(Colors);
                        Blue = GetBValue(Colors);

                        SetDlgItemInt(hMainDialog, ID_EDIT_RED, Red, FALSE);
                        SetDlgItemInt(hMainDialog, ID_EDIT_GREEN, Green, FALSE);
                        SetDlgItemInt(hMainDialog, ID_EDIT_BLUE, Blue, FALSE);       
                        SetDlgItemInt(hMainDialog, ID_EDIT_HEX, Colors, FALSE);
                }                       
        }

        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
}

---

If i made an ass out of myself by asking all that, then could someone do a paragraph on calling an API function. In MASM i learned to do it this way...

VC++

Code:

---

Colors = GetPixel(Hdc, Mouse.x, Mouse.y);

---

MASM

Code:

---

call  GetPixel, Hdc, Mouse.x, Mouse.y
mov    Colors, eax

---

Or something like that. But when i do that in VC++, i get errors everytime. So could ya just explain how to call API. Thanks.

Anyone? Just a paragraph or two on how to call an API?

Is that to much to ask?

I'm not really sure, but I think you have to push the parameters in reverse order:

Code:

---

push  Mouse.y
push  Mouse.x
push  Hdc
call  GetPixel
mov    Colors, eax

---

I hope this works,

Me.

I looked around some tutorials for TASM, just to see if i could find an answer. Well thats what i found, and for some reason that wont work either. I think VC++ has its own way of doing ASM. But thanks for trying though. And i know im whining in this thread, but because the code is in the message loop, its really slow. So i want to replace the whole message loop so it will go faster. But thanks though...

Anyone else?

Hey parksie, any suggestions?

Not really...

VC++ uses normal ASM. The thing about MASM (or possibly TASM), is that it uses different non-standard syntax to make it easier to call functions, rather than V(ery)'s utterly correct method of pushing them onto the stack. By the way, that's what __stdcall means - doing that. The other conventions have different methods, but that is the easiest to implement in nearly all cases.