C / C++ / MFC

Re: How to send message to the MainFrame from the dll space ?

7-Jun-10 18:02

Hello every body !

Now I add some messages in the MainFrame:

1、#define WM_MSG_UPLOAD WM_USER+101

2、afx_msg LRESULT OnUploadMsg(WPARAM wParam,LPARAM lParam);

3、ON_MESSAGE(WM_MSG_UPLOAD,OnUploadMsg)

4、At last, I pose a MessageBox in the "OnUploadMsg" function.

In the Dll:

void MainMsg()
{
  // ::SendMessage((HWND)AfxGetMainWnd(),WM_MSG_UPLOAD,0,0);
  AfxGetMainWnd()->PostMessage(WM_CLOSE, 0, 0);
}

But in the debug mode, AfxGetMainWnd() also is NULL. how can I send the message from the dll space to the MainFrame?

thanks for your reply !

Cool_Dev7-Jun-10 19:58

Cool_Dev

7-Jun-10 19:58

Are you sure that the window is created before MainMsg() in dll is being called? If not, m_pMainWnd member of theApp will be NULL.

Re: How to send message to the MainFrame from the dll space ?

wangningyu7-Jun-10 20:06

Re: How to send message to the MainFrame from the dll space ?

7-Jun-10 20:06

First , thanks for you reply !

Of course,I start the main program first, the m_pMainWnd is impositioned be NULL.

when the MainFrame OnCreate,I load the DLL. and when I click some menu command,it load the dll'function ,so...

I means that how to design the Inform Mechanism, like dll inform to the MainFrame ? Smile | :)

Cool_Dev7-Jun-10 20:22

Cool_Dev

7-Jun-10 20:22

if no other way, try adding a function such as SetHwnd(HWND hWnd) in dll, to pass window handle. From dll, use this handle to call ::SendMessage(hwnd, .. ..) Big Grin | :-D

Re: How to send message to the MainFrame from the dll space ?

wangningyu7-Jun-10 20:36

Re: How to send message to the MainFrame from the dll space ?

7-Jun-10 20:36

I see, thank you very much!

Aescleal7-Jun-10 21:08

Aescleal

7-Jun-10 21:08

Is your DLL an extension DLL and does it call AfxInitExtensionModule() in DLLMain (or whatever you've called it)?

It sounds like you're building a regular DLL and have created your own CWinApp derived object in the DLL. As the main window isn't created by the DLL m_pMainWindow is zero and AfxGetMainWnd hasn't got a lot to return.

Have a quick gawp at this.[^] It's got some more info about extenstion DLLs.

Cheers,

Ash

Re: How to send message to the MainFrame from the dll space ?

wangningyu7-Jun-10 21:18

BITMAP.bmBits returning NULLS

7-Jun-10 21:18

It's very useful ,thanks all the same!

ForNow7-Jun-10 13:56

7-Jun-10 13:56

Hi,

I was trying in vain to do some background coloring for a bitmap I was using a lot of people at the site gave

me valueble help however noting seemed to worked

fustrated I decided to look at the bitmap in core before and after BitBlt

I issued GetBit hoping to look at memory at the before and after value of the BITMAP.bmBits member

but the value returned was nulls before and after each BitBlt call

thanks in advance

Niklas L7-Jun-10 20:59

7-Jun-10 20:59

This should work for you:

CDC cdcimage;

cdcimage.CreateCompatibleDC(&cdcwindow);

COLORREF clrFill = RGB(128, 128, 128);

CBrush brush;
brush.CreateSolidBrush(clrFill);

CBrush *pOldBrush = cdcimage.SelectObject(&brush);
CBitmap *oldbit = cdcimage.SelectObject(&m_bitmap);

COLORREF clr = cdcimage.GetPixel(0, 0);

cdcimage.ExtFloodFill(0, 0, clr, FLOODFILLSURFACE);

cdcimage.SelectObject(oldbit);
cdcimage.SelectObject(pOldBrush);

ForNow8-Jun-10 6:38

8-Jun-10 6:38

I also tried GetBitmapbits what I saw was 3 bytes of white color
e.g. FF FF FF followed by a null 00

I am in the US time 12:30 pm

I'll try the code later on tonite

Thanks so much

ForNow8-Jun-10 18:21

8-Jun-10 18:21

It seem to fill part of the background with 128

When I dumped the bitmap GetBitmapBits I noticed the following pattern for 52 bytes there is the following seq FF FF FF 00

ExtFloodfill chages the seq to 80 80 80 00

after which the bitmap has a different shade of white FE FE FE to the naked eye this would seem like white

However when using BitBlt or ExtFloddFill to chage the background it will stop at he FE FE FE

I wonder I convert the Color to MonoChrome that I should only get 2 patterns white FF FF FF and black 00 00 00

then maybe by using SetBkColor and SetTextColor I can change the arrow and background to what I want

Niklas L8-Jun-10 23:07

8-Jun-10 23:07

ForNow wrote:
there is the following seq FF FF FF 00

ExtFloodfill chages the seq to 80 80 80 00

Well, that's what you want isn't it? And that's what the code I supplied does. Could you maybe post your entire function, because I think you might be doing some other things causing problems.

ForNow9-Jun-10 2:56

9-Jun-10 2:56

I appreciate it but what I meant was for 52 bytes the pattern was solid white e.g. FF FF FF after wards I noticed FE FE FE meaning to the naked eye it looked like the same color

your function worked great .. filling what was at location 0,0 until it encountered a different color pattern e.g. FE FE FE

I going to try to dump the entire bitmap and post it and my code (with OLE rtn that displays the bitmap) when I get home from work

thankx so much

Niklas L9-Jun-10 11:19

9-Jun-10 11:19

Ah ok. Then you have to ask yourself:

Is it possible to prepare the image in a program like photoshop to reduce the number of white shades? => Preferred solution

Does you algorithm need to be fully generic and work with whatever bitmap? => Some assumptions might make it possible to fill your image correctly doing it a few times over.

Is your bitmap large? And is the operation time critical? => Manipulate the image bits to reset the colors within a threshold in your own function.

I would guess the last option is what you might have to go for.

ForNow9-Jun-10 13:16

9-Jun-10 13:16

its really small the size of the visual studio debugger arrow I am writting debugger and wanted the same look

I used Awicons to convert a .jpeg to .bmp

If you could recommend another product I am certinally willing to invest in one

thankx

Niklas L9-Jun-10 21:57

9-Jun-10 21:57

That is the problem with jpeg format. It is good with photos, but not with other graphics.

Where did you get the image? Maybe there is a png/bmp/gif version of the same image?

Or just try to filter the colors in an editor. I use Paint.NET[^] for the little graphics work I do. (I suck at it.) It's a great freeware.

ForNow10-Jun-10 21:29

10-Jun-10 21:29

Sorry for the Late response Got Laid off today After 3 and half years they said it was performance .... must of deveolped dementia recently

Just down loaded Paint.net saved "save as" the jpeg as .bmp

Was wondering can I view a dump of the file to see RGB scheme e.g. if the white is all FF FF FF

Niklas L14-Jun-10 9:39

14-Jun-10 9:39

Sorry about your job mate.

I really don't know how you do these things, but try selecting the Paint Bucket tool, set Fill to Solid Color, select a sharp color (like clear blue) and experiment with the tolerance -> undo -> new tolerance -> undo ...

Setting the color to something irritating makes the effect of different tolerance values clear. Once you're happy, select white and flood the area.

There are probably filter techniques that can be used automagically, but I really wouldn't know.