How to load a bitmap

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patchariadog

Joined: 24 Mar 2013
Posts: 94

patchariadog 11 Dec 2013, 18:00

I have this code in c++ that loads a bitmap from a resource. how would I load a bitmap from a resource or a file (don't care which one we can get to work) in fasm

here is the c++ code

Code:

case WM_CREATE:
                {               

                        
                        bmpSource = (HBITMAP)LoadImage(GetModuleHandle(NULL), MAKEINTRESOURCE(IDI_WIN32FORMSAPPLICATION2), IMAGE_BITMAP, 0, 0, 0);
          hdcSource = CreateCompatibleDC(GetDC(0));
          SelectObject(hdcSource, bmpSource);

case WM_PAINT:
                hdc = BeginPaint(hWnd, &ps);
                BitBlt(hdc, 0, 0, 429, 87, hdcSource, 0, 0, SRCCOPY);
          EndPaint(hWnd, &ps);
                        
                break;

I tried this but it did not show anything

Code:


.wmcreate:  
invoke GetModuleHandleA,0
invoke LoadImageA,eax, "a.bmp", IMAGE_BITMAP, 0, 0, 0
mov [bmpSource],eax
invoke GetDC,0
invoke CreateCompatibleDC,eax
mov [hdcSource],eax
invoke SelectObject,[hdcSource], [bmpSource]

.wmpaint:
        invoke BeginPaint,[hwnd],ps
        invoke BitBlt, eax,0,0,200,200,[hdcSource],0,0,SRCCOPY
invoke EndPaint,[hwnd],ps  

data
bmpSource dd ?
hdcSource dd ?
ps PAINTSTRUCT <>

thanks

11 Dec 2013, 18:00

AsmGuru62

Joined: 28 Jan 2004
Posts: 1703
Location: Toronto, Canada

AsmGuru62 11 Dec 2013, 18:27

How does "a.bmp" is described in your RC file?
Does it have a NAME (a string) or an ID?

11 Dec 2013, 18:27

patchariadog

Joined: 24 Mar 2013
Posts: 94

patchariadog 11 Dec 2013, 18:58

I was trying to just run it from a file because I did not know how to load it in a resource so a.bmp is a file next to the exe

11 Dec 2013, 18:58

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20571
Location: In your JS exploiting you and your system

revolution 11 Dec 2013, 19:05

Looking at the docs for "LoadImage":

Quote:

lpszName

Identifies the image to load.

If the hinst parameter is non-NULL and the fuLoad parameter does not include LR_LOADFROMFILE, lpszName is a pointer to a null-terminated string that contains the name of the image resource in the hinst module.

So in your case the image must be a resource in the exe file because hinst is non-null and you didn't specify the LR_LOADFROMFILE flag.

11 Dec 2013, 19:05

patchariadog

Joined: 24 Mar 2013
Posts: 94

patchariadog 11 Dec 2013, 19:50

i tried this but it still did not work
invoke LoadImageA,eax, "a.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE

11 Dec 2013, 19:50

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20571
Location: In your JS exploiting you and your system

revolution 11 Dec 2013, 19:51

What is the error code returned from LoadImage?

11 Dec 2013, 19:51

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 11 Dec 2013, 20:08

patchariadog wrote:

invoke LoadImageA,eax, "a.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE

MSDN wrote:

hinst [in, optional]
…
To load a stand-alone resource (icon, cursor, or bitmap file)—for example, c:\myimage.bmp—set this parameter to NULL.

Those who program for Windows without MSDN should be euthanased for mercy's sake. Wink

11 Dec 2013, 20:08

AsmGuru62

Joined: 28 Jan 2004
Posts: 1703
Location: Toronto, Canada

AsmGuru62 11 Dec 2013, 20:10

You're almost done!
Just use 0 instead of EAX (1st param).

11 Dec 2013, 20:10

patchariadog

Joined: 24 Mar 2013
Posts: 94

patchariadog 11 Dec 2013, 20:49

this is what I got for the first part now but it still does not show it

Code:

invoke GetModuleHandleA,0
invoke LoadImageA,0, "a.bmp", IMAGE_BITMAP, 0, 0,LR_LOADFROMFILE
mov [bmpSource],eax
invoke GetDC,0
invoke CreateCompatibleDC,eax
mov [hdcSource],eax
invoke SelectObject,[hdcSource], [bmpSource]

thanks for the help

11 Dec 2013, 20:49

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20571
Location: In your JS exploiting you and your system

revolution 11 Dec 2013, 21:11

What are the error codes from each of the API calls?

11 Dec 2013, 21:11

AsmGuru62

Joined: 28 Jan 2004
Posts: 1703
Location: Toronto, Canada

AsmGuru62 11 Dec 2013, 21:26

Please use a debugger in this case.
I do not see any issues here, except that "a.bmp" may be not in the current directory.
Try a full path for this file.

11 Dec 2013, 21:26

patchariadog

Joined: 24 Mar 2013
Posts: 94

patchariadog 11 Dec 2013, 21:38

I tried the full path and it still does not work. how do I check the error codes I am using the fasmw ide

11 Dec 2013, 21:38

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20571
Location: In your JS exploiting you and your system

revolution 11 Dec 2013, 21:40

patchariadog wrote:

how do I check the error codes I am using the fasmw ide

Someone already mentioned a debugger. You could try ollydbg. But also just using MessageBox and displaying the returned values can be another option.

11 Dec 2013, 21:40

patchariadog

Joined: 24 Mar 2013
Posts: 94

patchariadog 11 Dec 2013, 22:30

how do I use messagebox if it is not crashing I am going to try using getlasterror but I never used this before

11 Dec 2013, 22:30

patchariadog

Joined: 24 Mar 2013
Posts: 94

patchariadog 11 Dec 2013, 22:43

I wasnt sure if I was suppose to put the getlast error after each line of code or just the last one so here are the results

wm_create
when I did just the last line it says good
when I did all lines all lines say good except the last line says invalid handle

wm_paint
does not give me any messageboxes

I don't know how to read these results so any help would be appreciated.
thanks

11 Dec 2013, 22:43

tthsqe

Joined: 20 May 2009
Posts: 767

tthsqe 11 Dec 2013, 23:34

patchariadog,
I used bitmap in a 2D game a long time ago. Since the whole thing might be overkill, I included strip.asm that just displays the bitmap. The functions that you should see are Paint, RedoPaint, and CleanupPaint.

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11 Dec 2013, 23:34

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