Re: Global Variables in VC++ 6 - C / C++ / MFC Discussion Boards

DBob10-Jan-05 4:32

10-Jan-05 4:32

Hi,
I am seeing "mouse up" messages disappear in the main event loop of my app and wondered if anyone's seen this problem before or has an idea what's going on?

Details:
The app has a custom event loop which gives time to some OpenGL display code and I have used PeekMessage with PM_NOREMOVE to see when there is a "mouse up" message in the queue. What I have found is that the calls to PreTranslateMessage and DispatchMessage can cause the "mouse up" message to vanish from the queue.

Summary of event loop for reference:

while(!quit)
{
    while(::PeekMessage(&msgCur, NULL, NULL, NULL, PM_REMOVE))
    {
        // ... extra control logic ...
        if(!PreTranslate(&msgCur))
        {
            ::TranslateMessage(&msgCur);
            ::DispatchMessage(&msgCur);
        }
        // ... more control logic ....
    }
    // ... more control logic ...
}

Any help appreciated.

Rob.

Global Variables in VC++ 6

guf-cryptkeeper10-Jan-05 4:23

guf-cryptkeeper

10-Jan-05 4:23

Hello.
I'm new in C++ Programming and want to write an application wich is able to process Bitmap files.
I try to use the MFC to get a Windows program.

I have a big Problem with my variables:
So I have a file called CADoc which loads the Bitmap in memory, a CAView which shows it in a Window and a CACutBmp (a modal Window) where the user should be able to give the top left corner and width amd height of the area he wants to process to cut a rectangle out of the bitmap.

CACutBmp is started in the CADoc file... so an Object of CACutBmp is builded and the source Data is given to the modal Window... But if i want to cut the Window it must be possible to give the data back to the CADoc Class...

Thats my problem. I dont find a way to do so.
Can somebody here explain me how to use global variables properly in a MFC Based Application ?
Is there a better way then global variables to pass Data from one Class to another ?

Excuse me if the question is unclear or too noobish, but i would really appreciate any suggestions to get this problem solved.

Best regards,
Crypt.

Re: Global Variables in VC++ 6

fklldsvs10-Jan-05 7:44

fklldsvs

10-Jan-05 7:44

I just went through a similar problem.
Do an artical search for "sendmessage". The first artical listed is very good on how to use send and post message between classes, as well as using pointers for other classes.

Hope this helps

John

Re: Global Variables in VC++ 6

guf-cryptkeeper10-Jan-05 22:53

guf-cryptkeeper

10-Jan-05 22:53

Hi John.
Thank you for the fast answer... but I don't find the article you mentioned... can you give me another hind how to find it Smile | :)

...
Helge.

Re: Global Variables in VC++ 6

act_x10-Jan-05 8:11

act_x

10-Jan-05 8:11

Cant u pass a structure as a reference to the CACutBmp class from within th doc that the user modifies ?

Re: Global Variables in VC++ 6

guf-cryptkeeper10-Jan-05 22:58

guf-cryptkeeper

10-Jan-05 22:58

Hi act.
Maybe that is what i should do... but i really do not know how to do it... Is it possible to find somewhere an example wich gives some further explanations on the how to ?
Helge.

Re: Global Variables in VC++ 6

Iain Clarke, Warrior Programmer10-Jan-05 8:45

Iain Clarke, Warrior Programmer

10-Jan-05 8:45

You *may* be overcomplicating the issue.

You have CADoc, which hold CABmp.

You have a command IDC_CROP which you want
to pop up a box, input some coords, and crop
the bitmap.

In header.

class CADocument : public CDocument
{
    ....
    CABmp m_Bmp;
    ....
    afx_msg void OnCrop ();
};

In Cpp

...
// Message map
ON_COMMAND(IDC_CROP, OnCrop)
...

// Function
void CADoc::OnCrop ()
{
    // Initialise the dialog.
    CADlg dlg (AfxGetMainWnd ());
    dlg.m_pBmp = &m_ABmp;
    dlg.m_rcBmp.SetRect (0,0, m_ABmp.GetWidth (), m_ABmp.GetHeight ());

    // Use the dialog to set a crop rectangle.
    if (dlg.DoModal () != IDOK)
        return;

    m_ABmp.Crop (dlg.m_rcBmp);

    SetModifiedFlag (TRUE);
    UpdateAllViews (); // Let the views know to redraw, using the new, leaner bitmap.
}

Just my thoughts. And there's a bunch to fill in...

Iain.

Re: Global Variables in VC++ 6

guf-cryptkeeper13-Jan-05 3:10

guf-cryptkeeper

13-Jan-05 3:10

UpdateAllViews was a good tip too !
It's just working perfect for me, much better then UpdateWindow amd Invalidate and this stuff!
But i had to use UpdateAllViews(NULL) to make it work...
No idea why but no I'm happy Smile | :)

...

Many Thanks again Iain,
Helge.

Re: Global Variables in VC++ 6

Iain Clarke, Warrior Programmer13-Jan-05 4:38

Iain Clarke, Warrior Programmer

13-Jan-05 4:38

If you look at the docs , it defines UpdateAllViews as:

void UpdateAllViews( CView* pSender, LPARAM lHint = 0L, CObject* pHint = NULL );

The pSender is an optimisation if you are calling this function from
a View.

void CMyView::OnPropagateAChange ()
{
    CMyDoc *pDoc = GetDocument ();
    ....
    pDoc->UpdateAllViews (this);
}

That would redraw all views of that document except this one. I've never needed
to call with anything other than NULL, but I can see why you *might*.

The other parameters are useful for other views to work out *why* they need
redrawing, in case they only need to do a partial job. In a simple app, you
can leave them at their defaults.

Iain.

Re: Global Variables in VC++ 6

guf-cryptkeeper11-Jan-05 23:39

guf-cryptkeeper

11-Jan-05 23:39

Sorry I'm too dumb...
Now i find this nice faq here 6.2

http://www.codeproject.com/cpp/cppforumfaq.asp#cpp_runapp

where it's perfect described how to use global variables.
This point works just perfect for me.

So anyway thanks for your help,
Best regards,
Helge.

Bind a EDIT CONTROL or DATACOMBOCONTROL

elo471110-Jan-05 3:44

elo4711

10-Jan-05 3:44

Bind a EDIT CONTROL or DATACOMBOCONTROL

Hi,

I am currently working on a program in VISUAL C ++ 6.0 (MFC) in which I would like to include an ADO DATA CONTROL 6.0 and a MS MASKED EDIT CONTROL or a DATACOMBOCONTROL .
The EDIT CONTROL is connected with the DATA CONTROL after program start-up.
All desired fields are indicated with the EDIT CONTROL.
Should the RECORDS SOURCE of the DATA Controls be changed or be limited during the runtime , the EDIT CONTROL looses the connection to the DATA CONTROL.

I have already tried everything REFRESH or BindProperty, unfortunately, without success.
I could not find a Solution to this problem or topic even in the Internet.
I would be thankful for a hint or for your assistance.

Re: Urgent help required - Window minimize/restore problem when process priority class is set to HIGH

Shog⁹10-Jan-05 9:43

Shog⁹

10-Jan-05 9:43

Listen in on the messages your window is recieving (Spy++ should work): note the differences between the messages recieved from clicking on the taskbar button, and those recieved when clicking on the menu. If they're the same, then your app probably has some problems pumping messages in a timely manner.

You left me high and dry and changed me You lied to me and now i’m angry...

Writing to Crystal Report RPT file using TTX file

ruturaj10-Jan-05 0:50

ruturaj

10-Jan-05 0:50

Hi,
I want steps to write Crystal Report file which is in RPT format and the data feilds are declared in the TTX file.

I want to populate the RPT file with the data from database in Access using TTX file.

This i want to do in vc++ 6.Need guidance.

Thanks to all....
Laugh | :laugh:

ruturaj

Custom App Wizard Problem

deep_198110-Jan-05 0:40

deep_1981

10-Jan-05 0:40

HI Frnz,
plz help me..i tried out sample hello world Custom wizard which accepts text but when i click OK button in New Project Information Wizard , i get an error..anyone familar with custom App Wizard ..help me...

"ERROR MSG:
Custom AppWizard while Parsing template 'Root.cpp near line 209
undefined symbol DOC "

is there anything to get included...help me frnds

I'm looking for algorithms

Rassul Yunussov9-Jan-05 23:42

Rassul Yunussov

9-Jan-05 23:42

I would like to find exactly - polygon area calculation, but can't find it. So, if anybody know the web site with such algorithms?

Re: I'm looking for algorithms

Arsalan Malik10-Jan-05 0:19

Arsalan Malik

10-Jan-05 0:19

Click[^]

ARSALAN MALIK

Re: I'm looking for algorithms

Antony M Kancidrowski10-Jan-05 6:43

Antony M Kancidrowski

10-Jan-05 6:43

That is a really simple solution. I shall remember that! Big Grin | :-D

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

Corba - TAO (Windows C++)

sweep1239-Jan-05 23:36

sweep123

9-Jan-05 23:36

Attempting to compile my first IDL I keep getting the following error( using Visual Studio 7.1):-

Corba_Square error PRJ0019: A tool returned an error code from "Invoking TAO_IDL Compiler on c:\ACE_wrappers\Tao\examples\Simple\Corba_Square\Corba_Square\Square.idl"

The IDL compiles and generates the files when included in an example project supplied. I have checked all the settings and cant find anything to fix.

Does anyone know how to get rid of this error.

I am just trying to setup a project that can be used as a starting point for other projects (all the build, compiler and linker settings in place etc).

Control like this ?

pc_dev9-Jan-05 23:03

pc_dev

9-Jan-05 23:03

Tree controls are usually alligned at left, what I need is a tree control which expands like an organizational chart, (like hierarcy) like this

.................N
.....+++++++++++++++++
.....N.........................N
.+++++++++.........++++++++
N............N..........N.........N

where N's are nodes that can be expanded.
Please ignore the dots they are for just making allignment.

Please Help.

Exporting resources in Visual Studio 6.0

anderslundsgard9-Jan-05 23:02

anderslundsgard

9-Jan-05 23:02

Hi.
I’m going to rebuild an Dialog based VC++ project into another. I would like to export and import some dialog resources between the two projects. Any idea how to do that except for cut and past in the .rc file manually…

_____________________________

...and justice for all

APe

Re: Exporting resources in Visual Studio 6.0

Monty²9-Jan-05 23:32

Monty²

9-Jan-05 23:32

Open up the project
select Dialog Resource from the tree
COPY
then close the project
Open the Destination project in the same studio window
Goto the Resource tree
PASTE

Trick is to do this in the same Studio window (not two windows opened and copy from one and paste in other)

hope it helps Big Grin | :-D

C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg

Re: Exporting resources in Visual Studio 6.0

anderslundsgard10-Jan-05 0:58

anderslundsgard

10-Jan-05 0:58

SUPER!!

I've so long suffer with this problem...
You made my day, and my futher developing easier!!

_____________________________

...and justice for all

APe

Re: Exporting resources in Visual Studio 6.0

Iain Clarke, Warrior Programmer10-Jan-05 8:51

Iain Clarke, Warrior Programmer

10-Jan-05 8:51

Even easier.

Open up new project.
Switch to resource view.

Then load in previous rc file.
The old resources appear in the workspace.
Now right drag them to the new project,
and pick "Copy" from the popup menu which appears.

Nice and easy for several resources.

Iain.

Strange effect

LiYS9-Jan-05 22:58

LiYS

9-Jan-05 22:58

Hi all:
I have a bunch of .wma files which is in "C:\Downloads" folder, and I copy them to another folder. So now there has two folders which have the same content concerning the .wma files.

What gets it really strange is that in details view within Explorer they have totally different amount of columns. In "C:\Downloads" folder these .wma files has lots of column such as "Artist", "Album", "release year" etc,. But in the other folder it only has "Type" and "modification time" two columns. How this difference could be happened since there's no environment differences, I really eager to know!
Thanks!!!

Re: Strange effect

Arjan Schouten9-Jan-05 23:05

Arjan Schouten

9-Jan-05 23:05

You can set folder details on a per folder basis,
just right click on the listview header in explorer and select what you want to see.

Arjan

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