Accessing Int 33h

[srfpala]

I'm using

INCLUDELIB \masm32\lib\Irvine32.lib
INCLUDELIB \masm32\lib\user32.lib
INCLUDELIB \masm32\lib\kernel32.lib

WinASM reports

Clean assemble
Clean link
and Program runs fine.

I add
  mov   ax,1
  int   33h

Program aborts on int 33h  command.

Why ?
What am I missing?
Bob

[dedndave]

the INTerrupt mechanism is for 16-bit programs
for 32-bit programs, things are very different
if you have a window, the WndProc routine receives mouse messages
for console-mode programs, you receive mouse inputs in the same buffer as the keyboard
there are also a few functions, like GetCursorPos that work asynchronously

decide whether you want a 16-bit or 32-bit program, then proceed from there

[kellinka]

Hey dedndave, could you go into detail about console mode programs and how the mouse input buffer would work? Or could you provide some sort of sources I could look at to find this information? I've been looking for the last 2 hours about how to do mouse input for console mode and I can't find anything helpful, it took me forever to find this thread to start with.

[dedndave]

asynchronously, you can always get the mouse position with GetCursorPos

http://msdn.microsoft.com/en-us/library/windows/desktop/ms648390%28v=vs.85%29.aspx

however, you can also perceive mouse actions by examining the input buffer
in this code, i use the same method to look for keys

Code Select Expand

;***********************************************************************************************

AnyKey  PROC

;UNICODE Aware Wait for Any Console Key Press - DednDave
;version 1, 12-2011
;version 2, 2-2013
;
;  This function returns when any console key is pressed (bKeyDown = 1).
;The function does not return for Shift/Alt/Ctrl keypresses.
;A possible drawback is that all input event records (mouse etc) are removed
;from the console input queue until a key is pressed. In many cases, this is
;not an issue. The virtual key code, virtual scan code, TCHAR character,
;and control key state values are returned in registers.

;Call With: Nothing
;
;  Returns: EAX = TCHAR character (high word of EAX = 0)
;           ECX = control key state flags
;               Bit   Name                Meaning
;                0    RIGHT_ALT_PRESSED   Right ALT key is pressed
;                1    LEFT_ALT_PRESSED    Left ALT key is pressed
;                2    RIGHT_CTRL_PRESSED  Right CTRL key is pressed
;                3    LEFT_CTRL_PRESSED   Left CTRL key is pressed
;                4    SHIFT_PRESSED       SHIFT key is pressed
;                5    NUMLOCK_ON          NUM LOCK light is on
;                6    SCROLLLOCK_ON       SCROLL LOCK light is on
;                7    CAPSLOCK_ON         CAPS LOCK light is on
;                8    ENHANCED_KEY        Key is enhanced
;           EDX: high word = virtual scan code
;            low word (DX) = virtual key code
;
;Also Uses: EBX, ESI, EDI, EBP are preserved

;-------------------------------------------------

    LOCAL   ir          :INPUT_RECORD
    LOCAL   uRecCnt     :UINT
    LOCAL   hStdInp     :HANDLE

;-------------------------------------------------

    INVOKE  GetStdHandle,STD_INPUT_HANDLE
    mov     hStdInp,eax
    .repeat
        INVOKE  ReadConsoleInput,hStdInp,addr ir,1,addr uRecCnt
        movzx   ecx,word ptr ir.EventType
        mov     edx,dword ptr ir.KeyEvent.wVirtualKeyCode
    .until (ecx==KEY_EVENT) && (ecx==ir.KeyEvent.bKeyDown) && (dx!=VK_SHIFT) && (dx!=VK_CONTROL) && (dx!=VK_MENU)
    movzx   eax,word ptr ir.KeyEvent.UnicodeChar
    mov     ecx,ir.KeyEvent.dwControlKeyState
    ret

AnyKey  ENDP

;***********************************************************************************************
notice that it looks for KEY_EVENT's
the INPUT_RECORD structure may also contain MOUSE_EVENT's

http://msdn.microsoft.com/en-us/library/windows/desktop/ms683231%28v=vs.85%29.aspx
http://msdn.microsoft.com/en-us/library/windows/desktop/ms684961%28v=vs.85%29.aspx
http://msdn.microsoft.com/en-us/library/windows/desktop/ms683499%28v=vs.85%29.aspx
http://msdn.microsoft.com/en-us/library/windows/desktop/ms684239%28v=vs.85%29.aspx

i have never used it that way - i usually skip over mouse events - lol
but, it shouldn't be hard to figure out with the documentation
you may also want to use Get/SetConsoleMode

http://msdn.microsoft.com/en-us/library/windows/desktop/ms683167%28v=vs.85%29.aspx
http://msdn.microsoft.com/en-us/library/windows/desktop/ms686033%28v=vs.85%29.aspx

you may want to get the current console mode, store it
then set the mode - read inputs
then set the mode back to the original state before exit

[dedndave]

personally, if i want to use the mouse - i would write a GUI app   :t

EDIT: give me a few minutes to clean up a little example.....

[jj2007]

Here is a low tech example. The way to go is, as Dave rightly stated, ReadConsoleInput.

include \masm32\MasmBasic\MasmBasic.inc        ; download
  Init
  Cls
  Print "Hold the left mousekey down and move the mouse - hit Escape to quit"
  .Repeat
        invoke Sleep, 1
        invoke GetKeyState, VK_LBUTTON        ; kind of undocumented but it works ;-)
        .if sbyte ptr ah<0
                imul edi, MouseX, 85        ; may need adjustment for different screen resolutions or console fonts
                sar edi, 10
                imul ecx, MouseY, 50        ; may need adjustment
                sar ecx, 10
                Locate(edi, ecx)
                Print "."        ; show the point
        .endif
        invoke GetKeyState, VK_ESCAPE
  .Until sbyte ptr ah<0
  Exit
end start

[dedndave]

GUI example - the mouse position is in the status bar

you can also handle WM_LBUTTONDOWN and WM_RBUTTONDOWN messages to get clicks

EDIT: removed attachment, see next post

[dedndave]

i cleaned up my status bar/mouse example a little bit
fixed a couple things...