Getting pixel in hidden window

[Makalele]

Hi! I have next problem with my bot. It works sweet but if i hide the Internet Explorer Window or i open another window function GetPixelColor doesn't work ;/ for example : PixelGetColor($X,$Y,$WinHandle) etc... i thought that if i add $WinHandle parameter it'll work when window is hidden... maybe any1 know another method to get pixel in hidden window ?

[Makalele]

any way to do it exist ?

[Makalele]

help me plz

[SmOke_N]

Well rather than having you rack your brain on this... the short answer is "no". There's no way currently to get the device content of a minimized or hidden window because it isn't drawn when in these states.

[Makalele]

Hello there,

firstly the topics,

http://www.autoitscript.com/forum/index.ph...mp;#entry528636

http://www.autoitscript.com/forum/index.ph...mp;#entry567936

I'm trying to do it from few months. Still no effect. But i know it's possible, but no by straight method - i got another idea. I'm sure it'll be working in C++. So it's possible to make the small dll library in C++ and use this by DllCall function. But there is a problem - i know C++ language very low. And now, i'm making a request for users of this forum to help me. I think if you know C++ well, you'll make it very fast. Someone told me that it's impossible to read the pixel from hidden window, because windows don't draw the pixel when they are hidden. It's true, BUT if you use command called "Send Message" the window can send the data to our script (http://www.fengyuan.com/article/wmprint.html) Looks good? I think yes. The rest are in these topics. If you don't want to help me, please don't post here.

Sorry for my english - it isn't perfect yet ^^.

Regards,

Makalele

[DW1]

If you are looking for C++ help, you should try a C++ forum, or perhaps put this in chat as it is not an au3 issue/request.

Happy hunting.

[Makalele]

If you are looking for C++ help, you should try a C++ forum, or perhaps put this in chat as it is not an au3 issue/request.

Happy hunting.

Thanks for a tip. I'll do it. But maybe someone want to help me here

[SmOke_N]

I've replied to one of these posts already. It isn't about a desire to help you or not, I personally would love for it to be possible. But you've answered your own question with a fact.

I saw that cppman says it "should" be possible, but he's talking about Vista with no code to back it up. If you want to do it in XP, the fact that the last time you started a topic on this is still the same.

Do not start another thread on the same topic.

Edit:

Topics merged

Edited September 15, 2008 by SmOke_N

[Makalele]

I've replied to one of these posts already. It isn't about a desire to help you or not, I personally would love for it to be possible. But you've answered your own question with a fact.

I saw that cppman says it "should" be possible, but he's talking about Vista with no code to back it up. If you want to do it in XP, the fact that the last time you started a topic on this is still the same.

Do not start another thread on the same topic.

Edit:

Topics merged

Sry for starting new topic, thanks for merge

If it's working in C++ so it's possible in Windows XP >_<

[SmOke_N]

Sry for starting new topic, thanks for merge

If it's working in C++ so it's possible in Windows XP >_<

So where is this C++ code that it's working in?

[Makalele]

So where is this C++ code that it's working in?

http://www.fengyuan.com/article/wmprint.html

This is a guide how to capture the window to the clipboard. So someone can change this function:

void PrintWindow(HWND hWnd)
{
    HDC hDCMem = CreateCompatibleDC(NULL);

    RECT rect;

    GetWindowRect(hWnd, & rect);

    HBITMAP hBmp = NULL;

    {
        HDC hDC = GetDC(hWnd);
        hBmp = CreateCompatibleBitmap(hDC, rect.right - rect.left, rect.bottom - rect.top);
        ReleaseDC(hWnd, hDC);
    }

    HGDIOBJ hOld = SelectObject(hDCMem, hBmp);
    SendMessage(hWnd, WM_PRINT, (WPARAM) hDCMem, PRF_CHILDREN | PRF_CLIENT | PRF_ERASEBKGND | PRF_NONCLIENT | PRF_OWNED);

    SelectObject(hDCMem, hOld);
    DeleteObject(hDCMem);

    OpenClipboard(hWnd);

    EmptyClipboard(); 
    SetClipboardData(CF_BITMAP, hBmp);
    CloseClipboard();
}

To something like that:

int GetPixelColor(int x,y, HWND hwnd)
{
the code from last function ...

}

but on the end not copy bitmap to clipboard, just straight read the pixel using GetPixel or something like that Easy to make in my opionion, but i don't know how to do it exatcly. My c++ knowledge is bad >_<

[SmOke_N]

http://www.fengyuan.com/article/wmprint.html

This is a guide how to capture the window to the clipboard. So someone can change this function:

void PrintWindow(HWND hWnd)
{
    HDC hDCMem = CreateCompatibleDC(NULL);

    RECT rect;

    GetWindowRect(hWnd, & rect);

    HBITMAP hBmp = NULL;

    {
        HDC hDC = GetDC(hWnd);
        hBmp = CreateCompatibleBitmap(hDC, rect.right - rect.left, rect.bottom - rect.top);
        ReleaseDC(hWnd, hDC);
    }

    HGDIOBJ hOld = SelectObject(hDCMem, hBmp);
    SendMessage(hWnd, WM_PRINT, (WPARAM) hDCMem, PRF_CHILDREN | PRF_CLIENT | PRF_ERASEBKGND | PRF_NONCLIENT | PRF_OWNED);

    SelectObject(hDCMem, hOld);
    DeleteObject(hDCMem);

    OpenClipboard(hWnd);

    EmptyClipboard(); 
    SetClipboardData(CF_BITMAP, hBmp);
    CloseClipboard();
}

To something like that:

int GetPixelColor(int x,y, HWND hwnd)
{
the code from last function ...

}

but on the end not copy bitmap to clipboard, just straight read the pixel using GetPixel or something like that Easy to make in my opionion, but i don't know how to do it exatcly. My c++ knowledge is bad >_<

GetDC <-- And thus your problem. When the window is minimized or hidden, you can't get the correct Device Content. This C++ code does not do what you claim it does.

[Makalele]

GetDC <-- And thus your problem. When the window is minimized or hidden, you can't get the correct Device Content. This C++ code does not do what you claim it does.

Hmm but maybe that method by making 3 functions:

first (used on script start when window is visible)

void RememberWindow(HWND hWnd)

{

HDC hDCMem = CreateCompatibleDC(NULL);

RECT rect;

GetWindowRect(hWnd, & rect);

HBITMAP hBmp = NULL;

{

HDC hDC = GetDC(hWnd);

hBmp = CreateCompatibleBitmap(hDC, rect.right - rect.left, rect.bottom - rect.top);

ReleaseDC(hWnd, hDC);

}

}

second

int RefreshPixelData

{

HGDIOBJ hOld = SelectObject(hDCMem, hBmp);

SendMessage(hWnd, WM_PRINT, (WPARAM) hDCMem, PRF_CHILDREN | PRF_CLIENT | PRF_ERASEBKGND | PRF_NONCLIENT | PRF_OWNED);

SelectObject(hDCMem, hOld);

DeleteObject(hDCMem);

}

int GetPixel(int x,y)

{

GetPixel(....

}

is it possible now ?

[SmOke_N]

What difference would it make if you divided the same function up into 10 individual functions?

[ofLight]

http://www.fengyuan.com/article/wmprint.html

Is this not just showing how to rewrite an app to display the clientdata differently, so that it can be read while not visible? This can be done if you are creating the app from scratch or have access to the source, but for any other purpose this is unusable. For example if you wanted to read the pixels on a minimized game window, this code does not apply.

[Zedna]

I did some tests too but no luck on WINXP 

Here is link to my post:

http://www.autoitscript.com/forum/index.ph...st&p=523910

[SmOke_N]

I did some tests too but no luck on WINXP 

Here is link to my post:

http://www.autoitscript.com/forum/index.ph...st&p=523910

I translated it:

expandcollapse popup

_PrintWindow(WinGetHandle(""))

Func _PrintWindow($h_wnd)
    
    Local Const $CF__BITMAP      = 0x002
    Local Const $PRF__CHILDREN   = 0x0010
    Local Const $PRF__CLIENT     = 0x004
    Local Const $PRF__ERASEBKGND = 0x008
    Local Const $PRF__OWNED      = 0x0020
    Local Const $WM__PRINT       = 0x00317
    
    Local $h_gdi32 = DllOpen("gdi32.dll")
    Local $h_user32 = DllOpen("user32.dll")
    
    Local $h_dc_mem = DllCall($h_gdi32, "hwnd", "CreateCompatibleDC", "hwnd", 0)
    
    Local $t_rect = DllStructCreate("int left;int top;int right;int bottom")
    DllCall($h_user32, "int", "GetWindowRect", "hwnd", $h_wnd, "ptr", DllStructGetPtr($t_rect))
    
    Local $h_dc = DllCall($h_user32, "hwnd", "GetDC", "hwnd", $h_wnd)
    Local $h_bmp = DllCall($h_gdi32, "hwnd", "CreateCompatibleBitmap", "hwnd", $h_dc[0], _
        "int", DllStructGetData($t_rect, "right") - DllStructGetData($t_rect, "left"), _
        "int", DllStructGetData($t_rect, "bottom") - DllStructGetData($t_rect, "top"))
    DllCall($h_gdi32, "int", "ReleaseDC", "hwnd", $h_dc[0])
    
    Local $h_old = DllCall($h_gdi32, "hwnd", "SelectObject", "hwnd", $h_dc_mem[0], "hwnd", $h_bmp[0])
    DllCall($h_user32, "int", "SendMessage", "hwnd", $h_wnd, _
        "int", $WM__PRINT, "wparam", $h_dc_mem[0], _
        "lparam", BitOR($PRF__CHILDREN, $PRF__CLIENT, $PRF__ERASEBKGND, $PRF__OWNED))
    
    DllCall($h_gdi32, "hwnd", "SelectObject", "hwnd", $h_dc_mem[0], "hwnd", $h_old[0])
    
    DllCall($h_user32, "int", "OpenClipboard", "hwnd", $h_wnd)
    DllCall($h_user32, "int", "EmptyClipboard")
    
    DllCall($h_user32, "int", "SetClipboardData", "long", $CF__BITMAP, "hwnd", $h_bmp[0])
    DllCall($h_user32, "int", "CloseClipboard")
    
    DllCall($h_gdi32, "int", "DeleteObject", "hwnd", $h_dc_mem[0])
    DllClose($h_gdi32)
    DllClose($h_user32)
    Return
EndFunc

But the bmp is always black.

[Makalele]

I translated it:

expandcollapse popup

_PrintWindow(WinGetHandle(""))

Func _PrintWindow($h_wnd)
    
    Local Const $CF__BITMAP      = 0x002
    Local Const $PRF__CHILDREN   = 0x0010
    Local Const $PRF__CLIENT     = 0x004
    Local Const $PRF__ERASEBKGND = 0x008
    Local Const $PRF__OWNED      = 0x0020
    Local Const $WM__PRINT       = 0x00317
    
    Local $h_gdi32 = DllOpen("gdi32.dll")
    Local $h_user32 = DllOpen("user32.dll")
    
    Local $h_dc_mem = DllCall($h_gdi32, "hwnd", "CreateCompatibleDC", "hwnd", 0)
    
    Local $t_rect = DllStructCreate("int left;int top;int right;int bottom")
    DllCall($h_user32, "int", "GetWindowRect", "hwnd", $h_wnd, "ptr", DllStructGetPtr($t_rect))
    
    Local $h_dc = DllCall($h_user32, "hwnd", "GetDC", "hwnd", $h_wnd)
    Local $h_bmp = DllCall($h_gdi32, "hwnd", "CreateCompatibleBitmap", "hwnd", $h_dc[0], _
        "int", DllStructGetData($t_rect, "right") - DllStructGetData($t_rect, "left"), _
        "int", DllStructGetData($t_rect, "bottom") - DllStructGetData($t_rect, "top"))
    DllCall($h_gdi32, "int", "ReleaseDC", "hwnd", $h_dc[0])
    
    Local $h_old = DllCall($h_gdi32, "hwnd", "SelectObject", "hwnd", $h_dc_mem[0], "hwnd", $h_bmp[0])
    DllCall($h_user32, "int", "SendMessage", "hwnd", $h_wnd, _
        "int", $WM__PRINT, "wparam", $h_dc_mem[0], _
        "lparam", BitOR($PRF__CHILDREN, $PRF__CLIENT, $PRF__ERASEBKGND, $PRF__OWNED))
    
    DllCall($h_gdi32, "hwnd", "SelectObject", "hwnd", $h_dc_mem[0], "hwnd", $h_old[0])
    
    DllCall($h_user32, "int", "OpenClipboard", "hwnd", $h_wnd)
    DllCall($h_user32, "int", "EmptyClipboard")
    
    DllCall($h_user32, "int", "SetClipboardData", "long", $CF__BITMAP, "hwnd", $h_bmp[0])
    DllCall($h_user32, "int", "CloseClipboard")
    
    DllCall($h_gdi32, "int", "DeleteObject", "hwnd", $h_dc_mem[0])
    DllClose($h_gdi32)
    DllClose($h_user32)
    Return
EndFunc

But the bmp is always black.

Finally i found that topic >_<

http://www.autoitscript.com/forum/index.php?showtopic=55564

That section is the section that requires the assembly.

So i think it'll only work in C++.. I need to read pixel's from Flash Object in Internet Explorer, maybe is another way to do it ? Maybe someone test it in C++ ?

[komalo]

okay , i don't have an answer for you but it is just an idea

your problem starts on hiding the internet explorer window

maybe you can just move the window off screen , show it

and use the PixelGetColor Function then hide it and get it

back to it's original position

Edited September 16, 2008 by komalo

[Makalele]

okay , i don't have an answer for you but it is just an idea

your problem starts on hiding the internet explorer window

maybe you can just move the window off screen , show it

and use the PixelGetColor Function then hide it and get it

back to it's original position

so you think i move visible window 2000pixels for right it will be working ?