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I have a CWnd derrived window class and I have added handlers for WM_LBUTTONDBLCLK, WM_LBUTTONDOWN and WM_LBUTTONUP. However, OnLButtonDblClk() does not appear to be called when I double-click the window but the OnLButtonDown and OnLButtonUp handlers work OK. I have tried adding CS_DBLCLKS when creating (although this should not be necessary) but it still doesn't work.
Any thoughts as to why this should be or what I could try?
Thanks
Tony
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Do you have a message map entry for WM_LBUTTONDBLCLK?
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In order to know if the message is being sent, you could use the spy++ software that comes with Visual Studio.
Apart from that, depending on the way you've created the handlers you could be eliminating the double click in the click handler... Imagine you are doing the capture in a PreTranslateMessage assigned function and that after the event for WM_LBUTTONDOWN you would be cancelling the rest of the message queue.
Two attempts to help you. I guess that the first step is mandatory to help you to find the place where the error origines...
HTH!
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Thanks for the reply. I checked the messages being set using Spy as you suggested and the WM_LBUTTONDBLCLK was not being sent to the window.
Just for a giggle, I then added CS_DBLCLKS style to the style member of the WNDCLASS when I register the window class and it then worked.
I must admint that I dont really understand why this should be, because I add the CS_DBLCLKS style when I call Create later on. 
Thanks for your help! 
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Nice to know it helped. 
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As you discovered, CS_DBLCLKS is a *CLASS* style, it won't work in the Window Create.
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Can anyone tell me why this code does not work?
I spent a lot of time searching messages but still have no clue.
void CChildView::OnPaint(){
CPaintDC dc(this);
CDC DC;
DC.CreateCompatibleDC(&dc);
CRect R;
GetClientRect(&R);
CBitmap bm;
bm.CreateCompatibleBitmap(&DC,R.right,R.bottom);
DC.SelectObject(bm);
CBrush b(RGB(255,0,0));
DC.SelectObject(&b);
DC.Rectangle(20,20,800,400);
dc.BitBlt(0,0,R.right,R.bottom,&DC,0,0,SRCCOPY);
dc.SelectObject(&b);
dc.Rectangle(20,20,100,100);
}
The last 2 lines produce a bright red rectangle in the proper place
but the BitBlt produces a black and white crosshatch pattern.
I have run out of options
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Not completely sure what exactly you expect to see, since you only said it doesn't work for you, this could mean a lot of things.
Anyways, when you create a DC, it has a "default", 1 bit,1x1 bitmap selected into it. When you use CreateCompatibleBitmap on this DC, you are creating another bitmap with 1 bit colordepth, i supose that is not what you want. Try creating a compatible bitmap with dc instead of DC.
bm.CreateCompatibleBitmap(&dc,R.right,R.bottom); Does this work better?
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> //TODO: Implement signature here<
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Thanks code-o-mat
That seems to have solved the problem.
I don't know why I didn't see that, I says so in the manual.
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Somtimes tbe most obvious things slip our minds, probably exactly because they are so obvious we never start to think about them.
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> //TODO: Implement signature here<
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Boy ain't that the truth.
I haven't done any coding in about 3 years, but it is starting to come back to me.
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The problem is: i got a window, which is simply created with CreateWindow and its class is registered with RegisterClass, but, window has no background at all. It has frame with these buttons (close, minimize, maximize) but no background - it completely mirrors desktop. Have you ever encountered such thing? If yes, why this is happening?
Thanks
011011010110000101100011011010000110100101101110
0110010101110011
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Never mind, found a solution. Seems better not to use DWORD dwExStyle parameter at all.
011011010110000101100011011010000110100101101110
0110010101110011
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csrss wrote: Seems better not to use DWORD dwExStyle parameter at all.
There's nothing wrong with extended styles, I use them all the time. I supect that you inadvertently had WS_EX_TRANSPARENT set in your CreateWindowEx() call.
I must get a clever new signature for 2011.
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I have an list control who have report style , but no full row selected . There is any possibility to know , on OnDblclkList(...) handler on which row is doubleclick fired ? Of course , when double-click is fired anywhere on list .
modified on Friday, March 11, 2011 2:07 PM
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You can use the API calls of GetFirstSelectedItemPosition() and GetNextSelectedItem() to find what items are selected, but that may not be the item where the double-click took place. The itme with focus that will probably be where the double-click took place.
Chris Meech
I am Canadian. [heard in a local bar]
In theory there is no difference between theory and practice. In practice there is. [Yogi Berra]
posting about Crystal Reports here is like discussing gay marriage on a catholic church’s website.[Nishant Sivakumar]
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Thank you for answer ... looking through MSDN , I found SubItemHitTest(...) method , but I don't know how I should use it in double click handler ... 
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I did it .. and for those who have the same issue , I put here the sample code :
void CMyView::OnDblclkList1(NMHDR* pNMHDR, LRESULT* pResult)
{
CString sTemp;
LVHITTESTINFO lv;
int nItem,nSubItem;
DWORD dwPos = ::GetMessagePos();
CPoint point((int)LOWORD(dwPos),(int)HIWORD(dwPos));
m_List.ScreenToClient(&point);
lv.pt = point;
m_List.SubItemHitTest(&lv);
nItem = lv.iSubItem;
nSubItem = lv.iItem;
sTemp.Format("nItem %d nSubItem %d",nItem,nSubItem);
MessageBox(sTemp);
*pResult = 0;
}
Thank you all , specially to Chris !
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Please look up NM_DBLCLK on MSDN.
Here's how to use it:
void CXListCtrlTestDlg::OnDblClick(NMHDR* pNMHDR, LRESULT* pResult)
{
LPNMITEMACTIVATE pNMIA = reinterpret_cast<LPNMITEMACTIVATE>(pNMHDR);
int nItem = -1;
int nSubItem = -1;
if (pNMIA)
{
nItem = pNMIA->iItem;
nSubItem = pNMIA->iSubItem;
}
if (nItem >= 0 && nSubItem >= 0)
{
CString strText = m_List.GetItemText(nItem, nSubItem);
Log(_T("OnDblClick at (%d,%d): '%s'"), nItem, nSubItem, strText);
}
*pResult = 0;
}
Here's the message map entry:
ON_NOTIFY(NM_DBLCLK, IDC_LIST, OnDblClick)
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Does function that , except one thing : nItem is always -1 ... why ?
I mention that list controls is not empty ( I load something in it ).
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I know why nItem is always -1 , because I have LVS_SINGLESEL style ....
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Hi all,
i writing excel file by two diffrent ways.
1. write (*.xls) excel file by odbc driver
2. write (*.xlsx) excel file using excel automation
its working fine.
i want to create heading in first line and want to format the column title text.
please tell me how can i do this.
thanks in advance.
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Try here[^] for lots of suggestions.
I must get a clever new signature for 2011.
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Did a quick walk through the excel type library using OLE/COM Object Viewer, fount 'Font' interface.
Get font property of Range (get range of desired cells), and modify it.
pesedo code may look like:-
Range range = excel.getRange("A2");
Font font = range.getFont();
font.putBold(TRUE);
Also found font property for 'Selection' interface too. Try these using the automation method you are using.
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