How to convert a string to a signed number?

[ikudesnik]

How to convert a string to a signed number?

[ikudesnik]

If you considered in line with the field EDIT

PUSH OFFSET string
PUSH 255
PUSH WM_GETTEXT
PUSH HWNDEDT2
CALL SendMessageA@16

[qWord]

e.g. using the CRT function sscanf:

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; x is SDWORD
; frmt db "%d",0
invoke crt_sscanf, ADDR string, ADDR frmt, ADDR x
In the MASM32 library there is also the function atol:

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invoke atol,ADDR string
mov x,eax
...and a macro:

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mov x, sval(ADDR string)

[jj2007]

Pure assembler

include \masm32\MasmBasic\MasmBasic.inc      ; download
  Init
  Inkey Str$("The decimal representation of your input is %i", Val(Prompt$("Type a decimal, hex or binary number, then close this window:", "0x123")))
  Exit
EndOfCode

[ikudesnik]

In kernel32.inc not described functions atol, strtoint. What to do?
I Use MASM32.

[hutch--]

Use the recommended include file. The functions you refer to are in MSVCRT.

The include file is "masm32rt.inc".

[Vortex]

In kernel32.inc not described functions atol, strtoint.

atol is defined in \masm32\include\masm32.inc

About StrToInt :

https://msdn.microsoft.com/en-us/library/windows/desktop/bb773446%28v=vs.85%29.aspx

[dedndave]

If you considered in line with the field EDIT

PUSH OFFSET string
PUSH 255
PUSH WM_GETTEXT
PUSH HWNDEDT2
CALL SendMessageA@16

we generally use INVOKE to do that for us....

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    INVOKE  SendMessage,HWNDEDT2,WM_GETTEXT,255,offset string

if you start your program with this single line,
it will add most of the inc's and lib's you will need

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        INCLUDE    \Masm32\Include\Masm32rt.inc

i often add these lines after that one, to enable newer instructions

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        .686p
        .MMX
        .XMM

[jj2007]

If you considered in line with the field EDIT

PUSH OFFSET string
PUSH 255
PUSH WM_GETTEXT
PUSH HWNDEDT2
CALL SendMessageA@16

I see that nobody here honours my fantastic Val macro :(

So, here is a plain WinAPI solution: GetDlgItemInt.

[rrr314159]

I see that nobody here honours my fantastic Val macro :(

- somebody once advised "cast not your pearls before swine"