BMP on button?

I have a BMP loaded. It loads fine but I have 1 problem. I try this:


SendMessage(GetDlgItem(hwnd, 1001), BM_SETIMAGE, (WPARAM)GfxCnt, (LPARAM)0);


Nothing happens. How would I set an image on a button? If you can let me know this too it would be great:


How would I detect a WM_LBUTTONDOWN on a bitmap?

According to MSDN the WPARAM should either be IMAGE_BITMAP or IMAGE_ICON and the LPARAM is the handle to the image.

If you want to fully customise the way buttons behave when click look into Owner-Draw buttons.

Sorry that was the wrong code, here's what I have:


CreateWindow(
"button",
NULL,
WS_CHILD | WS_VISIBLE | BS_OWNERDRAW | BS_BITMAP,
210, 350,
100, 20,
hwnd,
(HMENU)100,
0,
0
);

SendMessage(GetDlgItem(hwnd, 100), BM_SETIMAGE, (WPARAM)IMAGE_BITMAP, (LPARAM)netftp_cnt);

It does not work for me!:(

What's netftp_cnt?

The netftp_cnt is my HBITMAP for the BMP to go on the button.

Another snippet from MSDN -

Quote:

---

Do not combine the BS_OWNERDRAW style with any other button styles.

---

I removed the BS_OWNERDRAW style and did a quick test using an icon instead of a bitmap and your code worked fine.

If you still want an Owner-Draw button, you'll have to paint your bitmap on receipt of a WM_DRAWITEM message and not using BM_SETIMAGE.

If you use the BS_BITMAP style you don't need the BS_OWNERDRAW style.

If you want an owner draw button then use BS_OWNERDRAW style in which case you will need to handle at the very least the WM_DRAWITEM msg in order to render the button's appearance in its various states. You might want to take a look at WM_MEASUREITEM too.

As to your 2nd question: "...WM_LBUTTONDOWN on a bitmap?",
assuming you mean the bmp that hopefully will appear on your button then there are a couple of possibilities.

1. Get the coords from the WM_LBUTTONDOWN and use PtInRect fn to see if mouse click has 'hit' the button. It should be a short task from there to see if it hit the bitmap on the button.

2. Subclass the button control and handle the subclassed button's WM_LBUTTONDOWN handler. You have to provide a wndproc for the subclassed button, use SetWindowLong to 'attach' it to the cntrl after it has been created and use CallWindowProc for default msg handling. Make sure you store the return value from SetWindowLong - (WNDPROC) - and use SetWindowLong with that stored value to reset to the sytem wndproc for the button control prior to its destruction.

If you just mean a bitmap that's blitted onto an wnd then just ensure you store the bmp's dimensions/coords and use the PtInRect fn for hit-testing.

Does this help?

I tried it with an icon like this:


netftp_cnt=LoadBitmap(hInst, "Ico1");

GetObject(netftp_right, sizeof(bm), &bm);

CreateWindow(
"button",
NULL,
WS_CHILD | WS_VISIBLE | BS_BITMAP,
210, 350,
100, 20,
hwnd,
(HMENU)100,
0,
0
);

SendMessage(GetDlgItem(hwnd, 100), BM_SETIMAGE, (WPARAM)IMAGE_ICON, (LPARAM)netftp_cnt);


That didn't work either. Can I see some code?

I didn't mean you should use an icon. I just used one to test your code -
HICON test = LoadIcon(0, IDI_APPLICATION);

HWND hbutton =CreateWindow(
"button",
NULL,
WS_CHILD | WS_VISIBLE | BS_ICON,
210, 350,
100,100,
hWnd,
(HMENU)100,
0,
0
);


SendMessage(hbutton, BM_SETIMAGE, (WPARAM)IMAGE_ICON, (LPARAM)test);

I got the icon. I will just use it with text. How do I load a custom Icon?

Ok. I am just going to use Icon and Text. How do I load a custom Icon on to a Button?

seemsto be a lot of similtaneous posting going on here! Sorry for the above reapeat of 'Sorensen's' note - but it honestly wasn't there when I posted my original reply!

Seems like you guys have it well sorted out anyway :)

>How do I load a custom Icon?

If it's from file then -

HICON test =(HICON) LoadImage(GetModuleHandle(0), "icon1.ico",IMAGE_ICON,SM_CXICON,SM_CYICON,LR_LOAD FROMFILE);

Otherwise if it's a resource then you can use LoadIcon() with the resource ID.

Thanks for your help! I did that but changed it to BMP and it worked! Thanks!

Here is what I found in the MSD and it worked fine for me...

you can do this for any of the button types checkbox, radio or pushbutton. The only problem is that the button image remains the same in all states..except when disabled...

Code:

---



m_bmp.LoadBitmap( IDB_MYBMP );

HBITMAP hbmp = m_bmp.operator HBITMAP();

//** Get pointer to the bitmap
m_button.SetBitmap( hbmp );

---