gdi, get screenshot problem

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sleepsleep

Joined: 05 Oct 2006
Posts: 13788
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sleepsleep 17 Mar 2007, 05:36

hi there

i was trying to make an application that could take desktop screenshot.
i code the thing in DLL (so that i or other could simply link to it and using it later).

although i successfully get the screenshot in bmp format, but* i wonder why it doesn't cover the whole desktop screen Sad

i only got a 240x800 px image but my desktop is 800x600 px. Sad

don't know where went wrong.

plez take a look at the below (maybe u could just copy and assemble it)

my files tab at 6
the dll core.

Code:

check below for updated thingy

console application to take screenshot upon init.

Code:

check below for updated thingy

Last edited by sleepsleep on 19 Mar 2007, 11:16; edited 1 time in total

17 Mar 2007, 05:36

Mr_Silent

Joined: 25 Apr 2006
Posts: 30

Mr_Silent 17 Mar 2007, 07:46

HORZRES = 8
VERTRES = 10

17 Mar 2007, 07:46

sleepsleep 17 Mar 2007, 07:56

lol @ myself Smile

thanks mr_silent

i think i got that value from google... without aware that it is not for windows Wink

http://www.google.com/search?client=opera&rls=en&q=define+HORZRES&sourceid=opera&ie=utf-8&oe=utf-8

maybe somebody could check if i leak any gdi resource or not

17 Mar 2007, 07:56

sleepsleep 19 Mar 2007, 11:15

okie, i reupdate this code and make it a nice dll that able to be called from vb, (or etc language as u wish)

file tabbed at 7

to use it from visual basic, just assembled the DLL then use the below code.

Code:

Private Declare Sub scan_window Lib "dscanner.dll" ()
Private Declare Sub set_bmpFileName Lib "dscanner.dll" (ByVal bmpFileName As String)
Private Declare Sub set_scwH Lib "dscanner.dll" (ByVal windowhandle As Long)

Private Sub Command1_Click()
    Dim k As String
    k = Text1.Text
    Call set_bmpFileName(k)
    Call set_scwH(Val(Text2.Text))
    Call scan_window
End Sub

Description:	sample win32 console app to test the dll	Download
Filename:	k.txt
Filesize:	673 Bytes
Downloaded:	465 Time(s)

Description:	the dll code, tabbed 7 assembled without problem with fasm released March 11, 2007	Download
Filename:	dscanner.txt
Filesize:	3.06 KB
Downloaded:	495 Time(s)

19 Mar 2007, 11:15

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7103
Location: Slovakia

vid 19 Mar 2007, 12:12

sleepsleep: sorry, but i must repeate my favourite one:

YOU SHOULD CHECK RETURN VALUES OF API CALLS!!!!!

Smile

19 Mar 2007, 12:12

asmfan

Joined: 11 Aug 2006
Posts: 392
Location: Russian

asmfan 19 Mar 2007, 12:44

Ok, the first of all - i like it)
then corrections & suggestions

Code:

format PE GUI DLL AT 500000h

To avoid automatic reallocation of base.

Code:

bmpFileHeader   BITMAPFILEHEADER 'BM',0,0,0,sizeof.BITMAPFILEHEADER + sizeof.BITMAPINFOHEADER

It is more understandable

Code:

bmpFileName     rb MAX_PATH

MAX_PATH is defined in win headers (=260)

Code:

bmpInfo         BITMAPINFOHEADER sizeof.BITMAPINFOHEADER,0,0,1,24,BI_RGB,0,0,0,0,0
                        rd 6  ;;WHAT IS IT FOR?WHY 6?

Setting the bfSize in BITMAPFILEHEADER

Code:

                mov     eax,[scwHeight]
                imul    eax,[scwWidth]
                imul    eax,3
                mov     [bmpSize],eax
                lea     edx,[eax+sizeof.BITMAPFILEHEADER+sizeof.BITMAPINFOHEADER]
                mov     [bmpFileHeader.bfSize],edx

its enough for a while;)

_________________
Any offers?

19 Mar 2007, 12:44

sleepsleep 19 Mar 2007, 16:15

thanks a lot Wink

vid & asmfan Razz

comments appreciated !! Smile

19 Mar 2007, 16:15

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7103
Location: Slovakia

vid 19 Mar 2007, 16:24

looking forward for newer version. This could make nice example if fixed

19 Mar 2007, 16:24

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