C / C++ / MFC

CTreeCtrl SetCheck problem

3-Dec-02 22:10

Hi,

I'm sending multiple overlapped I/O requests to a USB device, which it handles dutifully - unless there's an error.

How should I detect that?
I guess I could just send the requests, and then WaitForMultipleObjects to wait for the I/O's to complete. However, I'm not sure what happens when one of the transfers fails - do I have to wait until the remaining transfers time out, etc..

Are there "known good" solution to this scenario?

If I could find a souvenir / just to prove the world was here [sighist]

Brian van der Beek3-Dec-02 21:38

3-Dec-02 21:38

I have a Dialog with a CTreeCtrl that has the TVS_CHECKBOXES style. When I try to initialize the tree control by setting some checkboxes in the OnInitDialog of the dialog the checkboxes are not set. I found out that this is a MFC bug. I haven't been able to find a working workaround for this problem. One thing I did find was setting the image list before calling SetCheck, but this does not seem to work either. Anyone knows a working sollution?

peterchen3-Dec-02 22:05

3-Dec-02 22:05

Clickety[^]

If I could find a souvenir / just to prove the world was here [sighist]

Brian van der Beek3-Dec-02 22:25

3-Dec-02 22:25

Thanks for your reply, but I don't think this article covers my problem. I already tried to modify the style and then set the checkboxes, but still that does not work.

peterchen3-Dec-02 22:45

3-Dec-02 22:45

I thought I already added it...
Can't delve in deeper right now (@ work).

IIRC this one helps:
From InitDialog, Do a Postmessage(WM_APP)
Add a handler for WM_APP, and do the checkbox setting there

(I also have seen I've got to fix the project download Wink | ;)

)

Peter

If I could find a souvenir / just to prove the world was here [sighist]

Brian van der Beek4-Dec-02 1:27

4-Dec-02 1:27

Posting a message in the OnInitDialog does not seem to work either. The message is posted, the SetCheck is called, but still none of the checkboxes is checked.

peterchen4-Dec-02 1:59

4-Dec-02 1:59

Do you use SetitemState to set the check?
i.e.

void TreeCtrl_SetStateImage(CTreeCtrl & tree, HTREEITEM item, int stateImage)
{
  tree.SetItemState(item, INDEXTOSTATEIMAGEMASK(stateImage), TVIS_STATEIMAGEMASK);
}

??
Note: 0 is "no state image", 1 is "unchecked", 2 is "checked" with the default state image list.

If I could find a souvenir / just to prove the world was here [sighist]

Brian van der Beek4-Dec-02 2:25

4-Dec-02 2:25

I tried SetCheck as well as SetItemState and I used 0, 1 and 2 but still it does not work...got any ideas left?

peterchen4-Dec-02 2:36

4-Dec-02 2:36

wow, that's tough...

There's an old version of the article on http://buerger.metropolis.de/bitbucket/howto/checktree.htm, with VC project that works (although there's a small bug in the hit test code, that probably doesn't matter for you)

Another comctl32.dll version (IE update or something) might be a good idea before spending much more time on it.

If I could find a souvenir / just to prove the world was here [sighist]

Brian van der Beek4-Dec-02 2:40

4-Dec-02 2:40

Sorry to bother you again, but the link does not work :

Die angeforderte Seite konnte nicht gefunden werden.

I run windows2000 sp2 and ie 5.5 (that should be sufficient, not?)

peterchen4-Dec-02 2:50

4-Dec-02 2:50

sorry, it's http://buerger.metropolis.de/bitbucket/howto/checktree.html[^]

the project is at http://buerger.metropolis.de/bitbucket/howto/checktree.zip[^]

Brian van der Beek wrote:
I run windows2000 sp2 and ie 5.5 (that should be sufficient, not?)
It might be a problem with a particulary comctl32 version (which I doubt, but similar things have been this way)

If I could find a souvenir / just to prove the world was here [sighist]

jhwurmbach4-Dec-02 2:52

jhwurmbach

4-Dec-02 2:52

This is the new home:
http://www.cherea.de/bitbucket/checktree/checktree.html

"My opinions may have changed, but not the fact that I am right."
Found in the sig of Herbert Kaminski

peterchen5-Dec-02 8:07

5-Dec-02 8:07

How's it going?
I updated the zip file (on the cherea.de site), so it's unpacks to a compilable project

If I could find a souvenir / just to prove the world was here [sighist]

font resizing

jmgir3-Dec-02 21:18

jmgir

3-Dec-02 21:18

Hi Given a font and an rectangle I would like to know the best size of the font to acomodate a given text.

Can anybody help me?

Thanks Smile | :)

KaЯl3-Dec-02 21:39

KaЯl

3-Dec-02 21:39

You may use CDC::GetTextExtent(text) which gives you the size of the text in pixels if drawn with the currently CDC-selected font.

HTH,

Ohé Partisans, Ouvriers et Paysans
C'est l'alarme!

Le Chant des Partisans

jmgir3-Dec-02 21:47

jmgir

3-Dec-02 21:47

Yes, but I'm searching a general method to calculate the size of a font given a CRect and a text. There should be a relation between the size of the CRect in pixels and a given text to display in it (provided taht you have selected previously a font name)

Thanks

KaЯl3-Dec-02 22:01

KaЯl

3-Dec-02 22:01

jmgir wrote:
There should be a relation between the size of the CRect in pixels and a given text to display in it (provided taht you have selected previously a font name)

I'm not sure of that, because the font name is not enough. When a CFont object is constructed, the system tries to match the criteria you asked with the available fonts, and if it doesn't match, the system with get the closest font, which may be different from what you asked.
Another point is that DC characteristics need to be part of the calculations, 'cause font use logical units when you need pixel and this conversion is relative to the DC characteristics.
Anyway, if you can get this formula, I would be happy if you could share it, TIA Smile | :)

HTH,

Ohé Partisans, Ouvriers et Paysans
C'est l'alarme!

Le Chant des Partisans