Getting the console text attributes

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NanoBytes

Joined: 02 Jun 2011
Posts: 57
Location: Iowa, United States

NanoBytes 09 Dec 2011, 03:07

Hey, im am trying to create a function that will get the foreground and background colors of the console. I was looking through MSDN and it says that you need to use GetConsoleScreenBufferInfo, which requires a CONSOLE_SCREEN_BUFFER_INFO structure. I want to know why I cant simply create one as a local variable like so

Code:

local info:CONSOLE_SCREEN_BUFFER_INFO

So could you show me how to do this
I have considered using HeapAlloc, but im not sure that that is the best idea

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09 Dec 2011, 03:07

Picnic

Joined: 05 May 2007
Posts: 1389
Location: Piraeus, Greece

Picnic 09 Dec 2011, 06:31

Hi,

Here is a sample using CSBI.

09 Dec 2011, 06:31

AsmGuru62

Joined: 28 Jan 2004
Posts: 1619
Location: Toronto, Canada

AsmGuru62 09 Dec 2011, 11:34

You can get some room on stack simply by moving ESP register:

Code:

sub esp, sizeof.CONSOLE_SCREEN_BUFFER_INFO
mov   edi, esp
invoke      GetConsoleScreenBufferInfo, [hOutput], edi
mov       ax, [edi + GetConsoleScreenBufferInfo.wAttributes]
add       esp, sizeof.CONSOLE_SCREEN_BUFFER_INFO

09 Dec 2011, 11:34

NanoBytes

Joined: 02 Jun 2011
Posts: 57
Location: Iowa, United States

NanoBytes 11 Dec 2011, 23:23

I decided to do what AsmGuru said and just create the nessesary space for the data. BUT his examplt didnt work, FASM continualy says

Code:

Undefined Symbol: esp,sizeof.CONSOLE_SCREEN_BUFFER_INFO

The error is refering to the operand of 'sizeof' so I am assuming that I simply did not include a nessesary file

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He is no fool who gives what he cannot
keep to gain what he cannot loose.

11 Dec 2011, 23:23

AsmGuru62

Joined: 28 Jan 2004
Posts: 1619
Location: Toronto, Canada

AsmGuru62 12 Dec 2011, 00:05

Strange... my FASM package does not have the definition of that structure and its components. Here they are:

Code:

struct COORD
    X dw ?
    Y dw ?
ends
struct SMALL_RECT
    Left    dw ?
    Top     dw ?
    Right   dw ?
    Bottom  dw ?
ends
struct CONSOLE_SCREEN_BUFFER_INFO
    dwSize               COORD
    dwCursorPosition     COORD
    wAttributes          dw ?
    srWindow             SMALL_RECT
    dwMaximumWindowSize  COORD
ends

Put this somewhere in your .INC file(s) and try the code again.

12 Dec 2011, 00:05

NanoBytes

Joined: 02 Jun 2011
Posts: 57
Location: Iowa, United States

NanoBytes 12 Dec 2011, 00:21

Perfect, thank you

12 Dec 2011, 00:21

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