C / C++ / MFC Discussion Boards

Vu Nguyen20-Nov-01 7:02

20-Nov-01 7:02

Hi There!

Thank you for your help. The problem I have is different. I have a tree structure in the background. I then use SetItemData() to hook each node to a node in my backGround tree. When a node of CTreeCtrl is clicked, I display the coresponding node data in my backGround Tree. In the OnClick() event, I need to get the handle to the node that is selected. The problem I am having is that getSelectedItem() returns NULL at the beginning. After a few clicks, it seems to give me correct handle. I don't know if the search process is too slow or because the SetItemData screw me up. Do you have any clue?

Thanks

Vu

vucsuf

Re: CTreeCtrl Help Please!

Rassman21-Nov-01 2:11

Rassman

21-Nov-01 2:11

I suspect that you are trying to GetSelectedItem() actually between the change, there's a point at which none is selected.

You wrote the function as getSelectedItem(), are you doing this in java? You, you trator you (only joking man).

Anyway, check there is a selection first then with maybe a hit test.

We do it for the joy of seeing the users struggle.

Changing scrollbar colors?

Jim A. Johnson19-Nov-01 12:55

Jim A. Johnson

19-Nov-01 12:55

I'm working on an app that will have a buttload of custom controls, using bitmaps, etc. I need to be able to change the appearance of the scrollbar to match. If I have to, I'll do my own scrollbar from the ground up, using bitamps, but that will be a lot of work.

So I'm looking intoi just changing te colors of the standard oolbar. I know this can be donw, I've seen it on some web sites - and I believe this is just IE using some varioation of the stardard scrollbar. But I can't see how it's done. The stuff in the FlatScrollbar APIs only allows me to change the background color of the scrollbar, and that really doesn't look very good.

Can anyone give me a clue?

Thanks -

Re: Changing scrollbar colors?

Bernhard19-Nov-01 23:32

Bernhard

19-Nov-01 23:32

i think you are not interested in my opinion towards colored scrollbars (HORRIBLE).. so i let it be..
paul di lascia wrote an article bout that in the november issue of the msdn mag.. maybe this helps you..

http://www.msdn.microsoft.com/msdnmag/issues/01/11/c/c0111.asp

hope this helps..
bernhard

"There are three roads to ruin: women, gambling and technicians. The most pleasant is with women, the quickest is with gambling, but the surest is with technicians." Georges Pompidou

Re: Changing scrollbar colors?

Jim A. Johnson20-Nov-01 10:13

Jim A. Johnson

20-Nov-01 10:13

Actually, I am interested in your opinion, and I do agree with you: colored crollbars, as implemented on many Web pages, are ugly and worthless. (I even came across a page describing how to create scrollbars that flash in multiple colors.. my god, whatever happened to tasteful design?)

Anyway, what I want to do is include scrollbars inside a heavily bitmapped interface, and I'd like the colors to match the bitmap, rather than the Windows color scheme.. so I can plead an exception to the above.

In any case, it looks like this is not supported in Windiws; Paul's article esentially states that if you want to do anything worthwhile, I'd have to code the thing from scratch, which is what "im trying to avoid.

All the above notwithstanding.. thanks for the pointer.

Re: Changing scrollbar colors?

Bernhard20-Nov-01 19:22

Bernhard

20-Nov-01 19:22

i think if you want to have control about everything in your ui you should make sthing like a skinned ui (winamp, sonique) -> someone on this page wrote an article how to implement this.. how hard / easy this is? i have got no clue...

to your general question: i never missed the good ole windows scrollbars in sonique.. and i i never will.. i just don't like app's at all which look like normal windows gui - apps, but have got colored scrollbars and a colorful background.. (think one of the biggest problems of visual basic programmers.. an icon for every button.. but the rest is the same)

yaya.. just my 5 cent...
have a nice one
bernhard

"There are three roads to ruin: women, gambling and technicians. The most pleasant is with women, the quickest is with gambling, but the surest is with technicians." Georges Pompidou

News: Ultimate Grid for MFC 5.0 released today

Ed Worsfold19-Nov-01 11:45

Ed Worsfold

19-Nov-01 11:45

Hello everyone out in the C++ Forum...just a quick note to inform everyone of today's release of Ultimate Grid 5.0 for MFC...lots of great new features are included, so you might want to check it out.

Ultimate
Grid 5.0 for MFC

Thanks a lot

Ed Worsfold
Dundas Software Smile | :)

How can I lock up my application?

Cathy19-Nov-01 11:28

Cathy

19-Nov-01 11:28

I'm already an expert on how to make it crash. That's not what I'm after. I want to be able to temporarily lock up the main thread from another thread. I tried EnableWindow(FALSE) but the script re-enables it. I also tried CFrameWnd::SuspendThread() but that didn't do anything.

Cathy

Re: How can I lock up my application?

Anna-Jayne Metcalfe19-Nov-01 12:12

Anna-Jayne Metcalfe

19-Nov-01 12:12

Can you give more details on what you're trying to achieve Cathy? I'm a little unclear what you mean by "but the script re-enables it".

Usually freezing the UI thread is a bad idea because then the UI won't paint etc. etc...

I'm presuming you're doing some non-reentrant activity in a worker thread, and you need to stop commands whilst it's busy.

However, if EnableWindow() isn't cutting the mustard for you and you just need to prevent menu/toolbar activity, selectively trapping CN_COMMAND messages in an OnCmdMsg() override in the mainframe might achieve what you need. Remember to let CN_UPDATE_COMMAND_UI calls through though or your toolbars etc. won't update properly.

Good luck Rose | [Rose]

Andy Metcalfe - Sonardyne International Ltd

Trouble with resource IDs? Try the Resource ID Organiser Add-In for Visual C++ 5.0/6.0

"I'm just another 'S' bend in the internet. A ton of stuff goes through my system, and some of the hairer, stickier and lumpier stuff sticks."
- Chris Maunder (I just couldn't let that one past Wink | ;)

)

Re: How can I lock up my application?

Cathy19-Nov-01 12:29

Cathy

19-Nov-01 12:29

Andy Metcalfe wrote:
Can you give more details on what you're trying to achieve Cathy? I'm a little unclear what you mean by "but the script re-enables it".

The other thread is trying to determine if they have a valid license. I don't want them to be able to use the program for a certian period during the validation. Our program is a COM server. If I disable the main window, the scripting engine reinables it.

Andy Metcalfe wrote:
However, if EnableWindow() isn't cutting the mustard for you and you just need to prevent menu/toolbar activity, selectively trapping CN_COMMAND messages in an OnCmdMsg() override in the mainframe might achieve what you need. Remember to let CN_UPDATE_COMMAND_UI calls through though or your toolbars etc. won't update properly.

Thank you. I will try that. Smile | :)

Cathy

Re: How can I lock up my application?

Nish Nishant19-Nov-01 13:03

Nish Nishant

19-Nov-01 13:03

Try using a mutex/WaitForSingleObject to pause your main thread. Then from the thread that verifies that they have a valid license, close the mutex, thus allowing your main thread to continue.

Regards
Nish

Sonork ID 100.9786 voidmain

www.busterboy.org

Nish is a BIG fan of Goran Ivanisevic

Re: How can I lock up my application?

Anna-Jayne Metcalfe19-Nov-01 22:56

Anna-Jayne Metcalfe

19-Nov-01 22:56

Unless I'm missing something that will still prevent the UI from painting during the checking process.

Good idea in all other respects though! Smile | :)

)

Re: How can I lock up my application?

Anna-Jayne Metcalfe19-Nov-01 22:52

Anna-Jayne Metcalfe

19-Nov-01 22:52

Good luck Cathy. OnCmdMsg() is a useful (and damn scary at times) thing to mess with.

If you get stuck, shout and I'll post some examples. Smile | :)

)

c++ and database

19-Nov-01 10:38

hi

1) how can i get the names of the columns in a table without creating a CRecordset. I get the tables form the MSysObjects table. Maybe there is an other way to get the tables?????
I work with a Access databases, SQL and use the ODBC drivers.

2) is there a way to change the rights (read, write..) in C++ without using Access. Maybe through the ODBC driver????????????

please help!!!!!!!!!!!!!

Thx

Main Dialog & TabPage

XAlien19-Nov-01 10:36

XAlien

19-Nov-01 10:36

hi,
anyone know how transfer datas from the Main Dialog to a TabPage? Confused | :confused:

Re: Main Dialog & TabPage

luckylourson19-Nov-01 21:32

luckylourson

19-Nov-01 21:32

you can do a GetItemDlg(IDC_OBJECT) to retrieve a pointer on the data structure. You have to cast the value like (CEdit *) GetItemDlg (IDC_EDIT);

Problems selecting correct override

Bill Wilson19-Nov-01 10:22

Bill Wilson

19-Nov-01 10:22

I'm having a strange problem that I'm hoping someone can shed some light on.

In my COM server (.exe) i invoke the CString method Format. The problem is execution goes to the wrong override! Then it blows up.

Here is the initial command:

[ccode]
strDiag.Format(("iTotalUnused * 100) / g_ThreadsArray.GetSize() = %d",iTotalUnused * 100) / g_ThreadsArray.GetSize());
[/ccode]

When this executes I trace it into:

[ccode]
void AFX_CDECL CString::Format(UINT nFormatID, ...){ CString strFormat; VERIFY(strFormat.LoadString(nFormatID) != 0); va_list argList; va_start(argList, nFormatID); FormatV(strFormat, argList); va_end(argList);}

[/ccode]

instead of

[ccode]

// formatting (using FormatMessage style formatting)void AFX_CDECL CString::FormatMessage(LPCTSTR lpszFormat, ...){
[/ccode]

The actual blowup occurs in the LoadString function (which I don't want called in the first place0. It calls AfxGetResourceHandle which asserts afxCurrentResourceHandle is NULL.

I don't believe this is a bug in the CString class (i've used it too many times in this program.) I don't see anything wrong in my code, unless its environmental:

This control is windowless, it launches some number of worker threads and assigns tasks to them as requested. This code runs in one of the worker threads. The threads are created by instantiating a CWinThread derived object and invoiking its CreateThread method.

Thanks for the help,
Bill

Problem solved, feeling stupid

Bill Wilson19-Nov-01 11:19

Bill Wilson

19-Nov-01 11:19

The problem was caused by a typo,the parentheses are off.

Thanks for the help,
Bill

Re: Problems selecting correct override

Joaquín M López Muñoz19-Nov-01 11:20

Joaquín M López Muñoz

19-Nov-01 11:20

Seems like the evil comma operator strikes back Smile | :)

Well I guess all the problem reduces to having your first quotation mark displaced to the right of the second parenthesis, instead than to the left. As it stands, your expression evaluates as follows:

strDiag.Format(
  (
    "iTotalUnused * 100) / g_ThreadsArray.GetSize() = %d",
    iTotalUnused * 100
  ) / g_ThreadsArray.GetSize());

==> (operator , evaluates to its second argument)

strDiag.Format(
  (
    iTotalUnused * 100
  ) / g_ThreadsArray.GetSize());

==>

strDiag.Format(iTotalUnused * 100 / g_ThreadsArray.GetSize());

and this of course selects the Format(UINT,...) overload.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Memory DC at a differant BPP

clintsinger19-Nov-01 9:40

clintsinger

19-Nov-01 9:40

I have an byte array that contains 24 bit image. I would like to be able to scale it using StrechDIBits or something similar before I save the "compatible bitmap" to a bmp file. The problem is that if my screen is 16bit then my compatible DC is also 16 bits when I want it to be 24 and my image turns out distorted. Is there anyway to make a DC that is 24 bits even if the screen is at another BPP?

Please Help,
Clint Singer

PS. I thought I would try CreateDC but it seems that DEVMODE is only good for printers. Cry | :((

Re: Memory DC at a differant BPP

Christian Graus19-Nov-01 10:12

Christian Graus

19-Nov-01 10:12

I don't know, but I *do* know if you create a DIBSection you can make it 24 bit and stretchblt it in a DC of any bpp. You could create one the same size and copy the bitmap data into it, then viola.

If you find a way to create a DC with a different bpp, I'd sure be interested to hear about it.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Re: Memory DC at a differant BPP

clintsinger19-Nov-01 18:51

clintsinger

19-Nov-01 18:51

Do you have any examples as how to do this as I haven't been able to work well with a CreateDIBSection. I also assume one wouldn't use CreateCompatibleBitmap but rather define the Bitmap and all it's attributes to be 24bpp.

Thanks,
Clint

Re: Memory DC at a differant BPP

Christian Graus19-Nov-01 18:57

Christian Graus

19-Nov-01 18:57

I would if www.wdj.com would come up. If you download the code for Sept 2000, I had an article there in which I create DIBSections and copy bitmaps onto them.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

How???

pcverden19-Nov-01 9:02

pcverden

19-Nov-01 9:02

How do you make a program that is split up into two parts? Like this

-----------------------------------------------
///////////|
///////////|
///////////|
///////////|
///////////|
///////////|
1//////////|2
-----------------------------------------------

How do I make that?
If I put one line of text in 1 that is there forever how can I make it open a .txt file in number 2?
Can someone help me?

http://pcverden.topcities.com

Re: How??? Another Home Work???

Carlos Antollini19-Nov-01 9:10

Carlos Antollini

19-Nov-01 9:10

Is It Another Home Work???

Cheers....

Carlos Antollini.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.