C / C++ / MFC Discussion Boards

Re: Proverbial good example of CTreeCtrl

Sauro Viti5-Nov-10 6:40

5-Nov-10 6:40

federico.strati wrote:
Oh well, I just know I'll end up as always writing my own little app exploring all available options of the CTreeCtrl just for fun in learning...

grazie comunque

You don't need to write you little app to explore all available options as Microsoft had already done it: the MSDN documentation about MFC classes is very good (in my opinion...) and the MFC samples too. Have a look at CMNCTRL1 Sample: Demonstrates Common Control MFC Classes, Part 1[^].

I cite from the MSDN:

Microsoft wrote:
The CMNCTRL1 sample illustrates how to use the following common control MFC classes: CTreeCtrl, CToolBarCtrl, CAnimateCtrl, CDateTimeCtrl, and CMonthCalCtrl. It shows how the controls are created and how to change the controls using many of the different available styles. Some controls cover topics that often yield questions from the user; for example, the drag and drop implementation for CTreeCtrl.

PS: Prego... $Shucks | :-\$

Re: Proverbial good example of CTreeCtrl

David Crow5-Nov-10 4:00

David Crow

5-Nov-10 4:00

federico.strati wrote:
but I did already my bit in searching the articles first...

How were we to know?

federico.strati wrote:
neededless to say, giving an answer in search form is a bit pointless

Unless you consider that most folks that visit the C++ forums have NOT done an initial search. They would rather spend more time creating a CP profile and typing in an incoherent question than they would by just Googling. Lazy does not begin to describe some of the ones here. Given that your profile indicates you are indeed an educated person, you probably should have prefaced your post with what you had already tried. That would help to set you apart from the others.

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Man who follows car will be exhausted." - Confucius

Changing initial directory on File Open Dialog in MFC

Ed The C4-Nov-10 7:48

Ed The C

4-Nov-10 7:48

I cannot find a way to force an OpenFileDialog under Windows 7, Visual Studio 2010 C++ to always open the a folder of my choosing. The documentation for OPENFILENAME structure states for Windows 7 "If lpstrInitialDir has the same value as was passed the first time the application used an Open or Save As dialog box, the path most recently selected by the user is used as the initial directory."

I cannot find a way to override this - I have a set directory I always want to open to no matter what.
Of course I am always setting lpstrInitialDir to that folder. That works the first time, but as it says above, next time it opens to the last folder the user selected.

I saw a few C#, .NET flags in other posts to change this, but nothing I can find for MFC/C++.

Any ideas appreciated! TIA

Re: Changing initial directory on File Open Dialog in MFC

Code-o-mat4-Nov-10 8:12

Code-o-mat

4-Nov-10 8:12

Does it behave the same way also if you set lpstrInitialDir to NULL and pass the path in lpstrFile?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Leela: Fry, you're wasting your life sitting in front of that TV. You need to get out and see the real world.
Fry: But this is HDTV. It's got better resolution than the real world <

Re: Changing initial directory on File Open Dialog in MFC

«_Superman_»4-Nov-10 8:31

«_Superman_»

4-Nov-10 8:31

lpstrInitialDir is not supported starting from Vista.
As Code-o-mat said, you can copy the folder to be initially shown in lpstrFile.
An important point to note is that the path must have a trailing back slash.

«_Superman_»

I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: Changing initial directory on File Open Dialog in MFC [modified]

Ed The C5-Nov-10 6:20

Ed The C

5-Nov-10 6:20

Thanks, but what I have discovered is that if the Vista flag for the CFileDialog is set false, then the dialog will fail (not display and immediately return IDCANCEL) with a "bad filename" in the CommDlgExtendedError. It does not like just a directory in the lpstrFile if the Vista flag is false.

So unless there's another idea floating about, I am stuck! I have to use the old style dialog for now.

UPDATE(s): To help anyone who struggles with this:
I was not able (at first) to use the new style dialogs (vista=true) because OnInitDialog and OnInitDone are NOT supported anymore for CFileDialog. Our code did depend on this. But I found a post that suggested using OnFolderChange() instead. My tests indicate that it indeed is called before the user gets control (which was the reason for the OnInit stuff). So you might give that a try.

UPDATE2: The Superman's response is true, but I now know what the problem is: you have to have *.* or some more specific find option if you wish to set vista flag false and use lpstrFile. So, if I set the vista flag false, and use a string like "C:\\temp\\*.*" as lpstrFile, then the initial directory (C:\temp)is picked out of the full path.

Note that using the vista flag is cool as you get a preview, but in our case we have to do our own previews using a dialog template, which also is not supported after vista. So now, by using vista false, i get the OnInits, initial directory, and templates which means I can get my project done Smile | :)

Thanks for the help.

modified on Friday, November 5, 2010 3:55 PM

Message Removed

3-Nov-10 23:52

piul

3-Nov-10 23:52

Message Removed

Re: How to check if char* is a number

CPallini4-Nov-10 0:03

CPallini

4-Nov-10 0:03

You may use the strtol[^] function.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: How to check if char* is a number

piul4-Nov-10 0:08

piul

4-Nov-10 0:08

oops, I removed the message before seeing a reply was given.
I found a way anyhow, checking the ascii code

const char * pcField = sFileNumber.c_str();
int a = int(*pcField);
if (a >= 48 && a <= 57)
    //...

Re: How to check if char* is a number

Maximilien4-Nov-10 0:09

Maximilien

4-Nov-10 0:09

bad, bad programming. Sniff | :^)

Watched code never compiles.

Re: How to check if char* is a number

piul4-Nov-10 0:30

piul

4-Nov-10 0:30

ok, ok. I'll use isdigit(). I know my solution is not good looking, but, can I ask why is it bad programming?

Re: How to check if char* is a number

CPallini4-Nov-10 0:51

CPallini

4-Nov-10 0:51

Maybe not that bad. Ugly, neverthless.

Anyway you're just checking the first character of the string. Is this OK (i.e. the string will always contain at most 1 digit)?

Smile | :)

Re: How to check if char* is a number

piul4-Nov-10 1:30

piul

4-Nov-10 1:30

err... no, it may contain more than one digit. I see what you mean, it could be a character-string started by a number... Highly improbable in my application, but I should check it anyway, shouldn't I?

Re: How to check if char* is a number [modified]

Alain Rist4-Nov-10 1:44

Alain Rist

4-Nov-10 1:44

Simplest:

bool IsDigits(const std::string& str)
{
	return str.empty() ? false : str.find_first_not_of("0123456789") == str.npos;
}

More efficient:

bool IsDigits(const std::string& str)
{
	return str.empty() ? false : std::find_if_not(str.begin(), str.end(), isdigit) == str.end();
}

cheers,
AR

Edit: changed function name to IsDigits and added second version.
ReEdit: added empty string handling.

When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)

modified on Thursday, November 4, 2010 1:40 PM

Re: How to check if char* is a number

federico.strati4-Nov-10 0:11

federico.strati

4-Nov-10 0:11

better to use "isdigit" and related similar functions ("isalpha", "isspace", etc...)

Query For CFileDialog?

Le@rner3-Nov-10 20:43

Le@rner

3-Nov-10 20:43

hi i m using CFileDialog to open the file.

but there is one problem,

CString filter( "Text Files(*.txt)|*.txt||");
		CWaitCursor cwt;
		
		CFileDialog fileDlg(TRUE, NULL, NULL, OFN_PATHMUSTEXIST|OFN_FILEMUSTEXIST|OFN_HIDEREADONLY,filter,this,0);

		if (fileDlg.DoModal () == IDCANCEL) 
		{
			return;
		}
				CString OpenFile = fileDlg.GetPathName ();

		SetDlgItemText(IDC_PATH,OpenFile);

i want to open only .txt files,so i provide .txt format in filter.
but i open the dialog box and enter file name with some other extension its display and open.

i want as the list of CFileDialog not display the oher extension file same as its not open the other extension file from File Name field .

please help me for this.

thanks in advance.

Re: Query For CFileDialog?

Maximilien3-Nov-10 21:30

Maximilien

3-Nov-10 21:30

AFAIK, user can type in any name and the file dialog will accept it, you can detect that by deriving your own class from CFileDialog and override some of the members (see the documentation)

Originally, hooking was the proper method; but now override is the way to go.

Watched code never compiles.

Re: Query For CFileDialog?

GAJERA3-Nov-10 21:35

GAJERA

3-Nov-10 21:35

Override the CFileDialog
http://www.codeguru.com/cpp/w-d/dislog/commondialogs/article.php/c1933[^]

Re: Query For CFileDialog? [modified]

David Crow4-Nov-10 2:58

David Crow

4-Nov-10 2:58

Have you considered something like:

CFileDialog fileDlg(TRUE, NULL, NULL, OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST | OFN_HIDEREADONLY, _T("Text Files(*.txt)|*.txt||"), this);	
 	    
do
{
    if (fileDlg.DoModal () == IDCANCEL) 		
        return;		
    
} while (fileDlg.GetFileExt() != _T("txt"));

SetDlgItemText(IDC_PATH, fileDlg.GetPathName());

[edit]
Alain's suggestion is a much better solution.
[/edit]

modified on Thursday, November 4, 2010 11:25 AM

Re: Query For CFileDialog?

Alain Rist4-Nov-10 3:56

Alain Rist

4-Nov-10 3:56

Hi,
For custom file name validation derive from CFileDialog and override CFileDialog::OnFileNameOK[^].
This function allows you to reject a filename for any application-specific reason.
cheers,
AR

When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)

Error "string data,right truncated" generate when trying to Update by CRecordset?

Le@rner3-Nov-10 18:57

Le@rner

3-Nov-10 18:57

Hi all,

i m using assess database with odbc connection,and for each tabel of database i dervive the class from CRecordset.

when i m Trying to Update() the record its generate this error "string data,right truncated".

please help me how can i resolve this error.

thanks in advance.

Re: Error "string data,right truncated" generate when trying to Update by CRecordset?

Stephen Hewitt3-Nov-10 19:33

Stephen Hewitt

3-Nov-10 19:33

I'd guess the string's longer than the column's maximum length.

Steve

Re: Error "string data,right truncated" generate when trying to Update by CRecordset?

Le@rner3-Nov-10 19:34

Le@rner

3-Nov-10 19:34

no, field is text type and its max lenght is 255,but i always enter data less than 255

Re: Error "string data,right truncated" generate when trying to Update by CRecordset?

David Crow4-Nov-10 3:01

David Crow

4-Nov-10 3:01

Le@rner wrote:
please help me how can i resolve this error.

By using the debugger to step through the code, looking at the values of variables along the way.

InterlockedCompareExchange/cmpxchg-lock free queue

Endaroza3-Nov-10 11:53

Endaroza

3-Nov-10 11:53

Hi All!
Probably will go better on the WinAPI section but since there is an ASM part i'm a bit confused of where to put it, and seen that i use gcc...heeelp!! :P
I'm just getting mad, i'm tryng to build a lock-free messaging system with the usage of atomic instructions. And yes i could use boost but i'll lose the interesting part of the whole thing :P
I actually work on windows (hence the Interlock...) with CodeBlocks and the gcc bundled with him on a dual core PC

I instantiated a class with

class ZTest{
public:
   volatile LONG varToCheck;
}

And then i try to something like this (using a member variable of a class created with new)

ZTest *zt=new ZTest();
InterlockCompareExchange(&zt->varToCheck,DEFINE_ONE,DEFINE_TWO);

All the time, while in debug i obtain a segmentation fault... someone said that i should have not used the debug build, i then tryed with the release, removing all optimizations (just to be sure), but after 20/30 iteration over the Interlock... function everything explode...with a segmentation fault..

Reaching the limit of my wrath...i tried with assembly with the LOCK CMPXCHG instruction and... after 20/30 iteration guess what? A segmentation fault Dead | X|

Now, i guess something is totally worng with this, tomorrow i'll try with M$ compiler to check if it's only a gcc fault (i doubt but...)

Does someone ever tryed something like this?
Any suggestion, question and request clarification will be welcome...

Zak...ah, yes i think i'll get soon a segmentation fault myself...

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