C / C++ / MFC Discussion Boards

Re: How to detect logoff and lock event from atl COM Service

Robert Kuster22-Dec-03 13:28

22-Dec-03 13:28

Hi Chak.

> How to detect logoff and lock event from atl COM Service
It's easy with logoff - simply call SetConsoleCtrlHandler and catch the CTRL_LOGOFF_EVENT.

Lock events are trickier. I guess the easiest way to catch them is via a Winlogon Notification Package[^].

Note: Because the notification Dll gets loaded by Winlogon and because Winlogon is running under the local System account (your COM Service probably isn't?), you can't use the SendMessage API as a means of IPC communication between them. Try memory mapped files or named pipes instead. Also, set the Impersonate[^] reg-value of your notification Dll to 1 or modify the Dacl of your memory mapped file/named pipe appropriately (check this: A NotQuiteNullDacl Class[^]).

RK

PS: This were just presumptions from the top of my head -> for the exact behavior/terminology and implementation check the MSDN documentation.

CSocket stops receiving data

Daniel 'Tak' M.22-Dec-03 12:05

Daniel 'Tak' M.

22-Dec-03 12:05

I am using the CSocket class with all the CSocketFile and CArchive stuff (mainly based on the MFC samples). The problem now is, that, after some time, the socket won't receive anything (well, it receives it, but it still stops at some point).
When receiving the data with CAsyncSocket::Receive, it won't stop, so I guess it's a problem with either CSocket or CArchive/CSocketFile. The funny thing is that the MFC samples have the same problem... and it's not just my computer WTF | :WTF:

So is there any known solution to this or do I have to go a different direction without archives?
And yes, I used IsBufferEmpty()...

emulating console mode in a window

Ray Gregory22-Dec-03 11:50

Ray Gregory

22-Dec-03 11:50

Is there a simple way to emulate console mode on a GUI form or dialog box? Perhaps an article or control somewhere? Would it be logical to create one as a derived Rich Text box?

Sincerely,

Ray Gregory

Re: emulating console mode in a window

Tim Smith22-Dec-03 12:16

Tim Smith

22-Dec-03 12:16

All a console is (as far as look) is a window with a fixed width font.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: emulating console mode in a window

Jörgen Sigvardsson22-Dec-03 13:12

Jörgen Sigvardsson

22-Dec-03 13:12

I think it would be probably easier to write your own control for it. If you use the rich text box, you'll be spending lots of code to restrict it rather than extending it. After all, a rich text edit box is text editing control, while a "console" is a line-editing tool combined with static output.

--
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insídias diáboli esto præsídium. Imperet illi Deus, súpplices deprecámur:
tuque, princeps milítiæ cæléstis, Sátanam aliósque spíritus malígnos, qui
ad perditiónem animárum pervagántur in mundo, divína virtúte,
In inférnum detrude. Amen.

c++ dll: window not created properly

Extremor22-Dec-03 11:25

Extremor

22-Dec-03 11:25

Hi,

I wrote a c++ dll containing a CWnd, which is created an displayed when the dll is loaded by an application. When I use the dll with a c++ app or a VB app everything works fine, window is created and displayed as planned, but when i load the dll from a java application the window seems not to be created correctly.

Any ideas what might be the problem?

Re: c++ dll: window not created properly

Selvam R23-Dec-03 9:43

Selvam R

23-Dec-03 9:43

Hi,

i recommand to use statically linked regular DLL.If you choose statically linked DLL it includes copy all the needed MFC library code with in your DLL. So, it size is more. If you choose dynamic linked library the memory space is less compare then static linked library regular DLL. But, you will use proper DLL version in the target machine.

Regards,
R.Selvam

Build Comment Web Pages And C++

nde_plume22-Dec-03 11:09

nde_plume

22-Dec-03 11:09

As you will all surely know C# has this cool interface where you can
put XML into the comment blocks of your code, and have it automatically
generated as a web page of comments (especially using a tool like NDoc.)
This gives you a nice class documentation web page heirarchy.

I have a bunch of code that uses DOxygen style coding for inserting
similar stuff into my C++ code, however, I want to use the same techinques
in C++ that I do in C#. Specifically, I want to be able to type in the
comments directly when I use the class view to insert code, and I want
to be able to use NDoc to generate the pages.

I know about DOxygen, in fact I use it, however, I want to get on the
same page as C# with my C++ code for consistency and simplicity (and
by way of the fact that surely future versions of Visual Studio will
head that direction.)

I suppose I want to use NDoc with C++.

any thoughts or suggestions.

Set Tab Focus

Anthony988722-Dec-03 10:17

Anthony9887

22-Dec-03 10:17

How can I set the tab focus to a specific control in a dialog box.

Thanks

Re: Set Tab Focus

David Crow22-Dec-03 11:09

David Crow

22-Dec-03 11:09

SetFocus().

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Re: Set Tab Focus

ldaoust22-Dec-03 16:03

ldaoust

22-Dec-03 16:03

In your dialog class, where you want to set the focus to a control, try this:

GetDlgItem( ID_OF_CONTROL )->SetFocus();

Drag and drop to specific item in tree?

adonisv22-Dec-03 10:05

adonisv

22-Dec-03 10:05

I'm trying to implement the ability to drag and drop a file onto a tree control, BUT it would be great if you could only drag onto certain objects. Is there a way to allow the user to drag a file onto the tree control and depending on what type of object the user drags the file over, drag and drop is allowed or disallowed? Unsure | :~

It would be flimsy for them to have to select a tree item then drag and drop, much nicer if you simply drag the file to the object you want to add it to and if its allowed, it works! Big Grin | :-D

Re: Drag and drop to specific item in tree?

Michael Dunn22-Dec-03 17:19

Michael Dunn

22-Dec-03 17:19

When your IDropTarget::DragOver() method is called, you get a POINTL holding the cursor location. Convert that from screen coords to client coords (relative to the tree) then use TVM_HITTEST to find out which tree item that point is over.
Once you get that, you can decide whether to allow the drop over that item. Return DROPEFFECT_NONE to not allow it, or DROPEFFECT_MOVE/COPY to allow it.

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | RightClick-Encrypt | 1ClickPicGrabber
"Just because the box has 2 gigabytes of memory doesn't mean you get to use it all!"
-- Rico Mariani, CLR perf guy

Re: Drag and drop to specific item in tree?

adonisv30-Dec-03 6:02

adonisv

30-Dec-03 6:02

That's awesome thanks. Big Grin | :-D

Linking new dialog’s textbox w/ old dialog

Spank me!!22-Dec-03 9:37

Spank me!!

22-Dec-03 9:37

Hello,

I am trying to create a new dialog with a text box that accepts string values from my main dialog's program. In other words, once a button is pushed on my main dialog, a new dialog appears with a text box - i would like to send strings from my main dialog program to the new dialog's text box. I am using CCancelBox dlg; and dlg.DoModal(); to bring up my new dialog once the button is pushed, but I don’t know how to link the text box to my main dialog .cpp program. Thanks a million in advance.

~Loren. Confused | :confused:

Re: Linking new dialog’s textbox w/ old dialog

David Crow22-Dec-03 11:12

David Crow

22-Dec-03 11:12

The second dialog will need a member variable that the main dialog sets. Then in the second dialog's OnInitDialog() method, set the control's value to that of the member variable.

CmainDlg::Foo()
{
    C2ndDialog dlg;
    dlg.m_somevar = "Text!";
    dlg.DoModal();
}
 
C2ndDialog::OnInitDialog()
{
    CDialog::OnInitDialog();
    m_control.SetWindowText(m_somevar);
}

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

link error: msvcirt.dll

Vincent Sim22-Dec-03 9:33

Vincent Sim

22-Dec-03 9:33

i have met some problems when i try to write the matlab c++ programming.

after i finished my program and tried to compile in MSVC++ 6.0
.......
LINK : fatal error LNK1104: cannot open file "msvcirt.dll"

what should i do to settle this linking problem?
thank you for ur all helping

vincent sim

Re: link error: msvcirt.dll

David Crow22-Dec-03 11:14

David Crow

22-Dec-03 11:14

Vincent Sim wrote:
what should i do to settle this linking problem?

Check to ensure the file exists and that it is accessible by the linker.

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Trouble Compiling Help Files

Anonymous22-Dec-03 9:05

Anonymous

22-Dec-03 9:05

The problem that I am having is with regards to compiling the RTF files after I have made changes to them.

All I did was open the AfxCore.rtf file and replace the <<YourApp>> callouts with MyApps Name.

I used Microsoft Word 97 and saved the files back as RTF.

I then opened up Help Workshop and compiled the files.

I got numerous errors and the HLP file was not created.

Anyone else have this problem?

Re: Trouble Compiling Help Files

Roger Allen23-Dec-03 2:54

Roger Allen

23-Dec-03 2:54

Personally, I have always avoided using Word etc to edit the .rtf files. You will find that editing them in a tool such as notepad or Visual studio (as text) will allow you much better control.

Also this article may be of help if you do follow this route: Simplified AfxCore and AfxPrint.rtf files[^]

Roger Allen - Sonork 100.10016
If your dead and reading this, then you have no life!

string check

act_x22-Dec-03 8:05

act_x

22-Dec-03 8:05

I have a function that looks like

Process(string str1 , string str2)<br />
{<br />
string concat ;<br />
concat = str1+":"+str2;<br />
ProcessFurther(concat);<br />
}

str1 and str2 passed are strings but represent numbers. Is there a way i can do a type checking to find if its a valid number .
I am looking for something like isNumber() functionality as i need to make sure that what is passed is surely a valid integer and not a garbage string which might have catastrophic results !

Please advise

Re: string check

PJ Arends22-Dec-03 9:21

PJ Arends

22-Dec-03 9:21

you could use strtol() to convert the string to an integer, and then make sure the endptr actually points to the end of the string.

bool IsNumber(std::string str, int base)
{
    char *EndPtr = NULL;
    const char *Number = str.c_str();
    strtol(Number, &EndPtr, base);
    return (EndPtr != Number && *EndPtr == NULL);
}

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

Re: string check

act_x22-Dec-03 9:47

act_x

22-Dec-03 9:47

how can i differentiate between a conversion for the string "0" or a failed conversion ?

Engineering is the effort !

Re: string check

PJ Arends22-Dec-03 9:54

PJ Arends

22-Dec-03 9:54

The routine I gave you does that.

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

Re: string check

act_x22-Dec-03 10:13

act_x

22-Dec-03 10:13

sorry didnt see this
return (EndPtr != Number && *EndPtr == NULL);

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