Question

#include <windows.h>
int PASCAL WinMain( HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow )
{
    int result=MessageBox (NULL, "hello, world", "caption", MB_YESNOCANCEL);
    if (result==IDCANCEL)
        MessageBox (NULL, "you pressed cancel", "caption", MB_OK);
    else if (result==IDYES)
        MessageBox (NULL, "you pressed yes", "caption", MB_OK);
    else if (result==IDNO)
        MessageBox (NULL, "you pressed no", "caption", MB_OK);
    return 0;
};

WinMain proc near
        push bp
        mov bp, sp
        xor ax, ax ; NULL
        push ax
        push ds
        mov ax, offset aHelloWorld ; "hello, world"
        push ax
        push ds
        mov ax, offset aCaption ; "caption"
        push ax
        mov ax, 3 ; MB_YESNOCANCEL
        push ax
        call MESSAGEBOX
        cmp ax, 2 ; IDCANCEL
        jnz short loc_2F
        xor ax, ax
        push ax
        push ds
        mov ax, offset aYouPressedCanc ; "you pressed cancel"
        jmp short loc_49
        ; ---------------------------------------------------------------------------
        loc_2F:
        cmp ax, 6 ; IDYES
        jnz short loc_3D
        xor ax, ax
        push ax
        push ds
        mov ax, offset aYouPressedYes ; "you pressed yes"
        jmp short loc_49
        ; ---------------------------------------------------------------------------
        loc_3D:
        cmp ax, 7 ; IDNO
        jnz short loc_57
        xor ax, ax
        push ax
        push ds
        mov ax, offset aYouPressedNo ; "you pressed no"
        loc_49:
        push ax
        push ds
        mov ax, offset aCaption ; "caption"
        push ax
        xor ax, ax
        push ax
        call MESSAGEBOX
        loc_57:
        xor ax, ax
        pop bp
        retn 0Ah
WinMain endp

就是前一节的扩展而已。