C / C++ / MFC Discussion Boards

Dustin Henry14-May-07 4:28

14-May-07 4:28

I am trying to write a simple GDI program that displays a countdown timer(MM:SS:hh). I am just using the WM_PAINT message to display the updated time and calling InvalidateRect() in my main loop. This however causes the screen to flash as I am clearing the screen before I redraw the text.

FillRect(hdc, &rPos, (HBRUSH)GetStockObject(BLACK_BRUSH));
DrawText(hdc, stTime, stTime.GetLength(), &rPos, DT_CENTER | DT_WORDBREAK);

Any suggestions on how I can stop the text from flashing while still being able to update at hundreths of a second?

Thanks, Dustin

Re: Simple GDI program

Arman S.14-May-07 5:40

Arman S.

14-May-07 5:40

InvalidateRect with the last [bErase] parameter FALSE. This will prevent from flickering.

If you will have a problem with the messed drawings (caused by previous drawings) you could use non-transparent mode or somth else like drawing a new background before the actual text is drawn [which I could see is done by your FillRect call].

--
=====
Arman

Re: Simple GDI program

Dustin Henry14-May-07 6:20

Dustin Henry

14-May-07 6:20

I had actually been using InvalidatRect with bErase set to false. The problem was that I was using transparent mode as you stated, and not seting the background of the text like Mark suggested.

Thanks for the help, Dustin Smile | :)

Re: Simple GDI program

Arman S.14-May-07 6:57

Arman S.

14-May-07 6:57

Now you are doing right.

The problem was that I was using transparent mode as you stated

Well, I said use 'non-transparent' Smile | :)

--
=====
Arman

Re: Simple GDI program [modified]

Mark Salsbery14-May-07 5:56

Mark Salsbery

14-May-07 5:56

Instead of drawing the background and drawing the text in two steps, try doing it in one:

//FillRect(hdc, &rPos, (HBRUSH)GetStockObject(BLACK_BRUSH));
::SetTextColor(hdc, RGB(0xFF,0xFF,0xFF));
::SetBkColor(hdc, RGB(0x00,0x00,0x00));
::DrawText(hdc, stTime, stTime.GetLength(), &rPos, DT_CENTER | DT_WORDBREAK);

You'll also want to follow Arman's advice so the background doesn't get repainted every update.

Also, WM_PAINT isn't the only place you can draw on the window from. You can draw the text from
anywhere you want. WM_PAINT messages are low priority so if you need better performance do
the DrawText from elsewhere. If it's from a different thread, you need to sync acess to the
HDC as always.
*edit* (Thanks Michael Dunn)
You'll still need to redraw the window contents in response to WM_PAINT and/or
WM_ERASEBKGND so the window is refreshed when it needs updating (e.g when another window is
dragged across it and/or off it).
*end edit*

Mark

-- modified at 14:21 Monday 14th May, 2007

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: Simple GDI program

Dustin Henry14-May-07 6:17

Dustin Henry

14-May-07 6:17

Thanks for the halp Mark, that worked perfectly. I've become so dependent on DirectX I've forgotten how to use GDI properly. Smile | :)

Dustin

Re: Simple GDI program

Michael Dunn14-May-07 8:04

Michael Dunn

14-May-07 8:04

Mark Salsbery wrote:
Also, WM_PAINT isn't the only place you can draw on the window from. You can draw the text from anywhere you want.

This is true, but if you do any drawing outside of WM_ERASEBKGND and WM_PAINT, you'll need to manually redo the drawing if the window becomes uncovered. (This is what causes people to ask "I draw something in WM_INITDIALOG but it goes away if I move another window over mine.") If you do all drawing in response to those two messages, you won't need to do that bookkeeping.

--Mike--
Visual C++ MVP Cool | :cool:

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Re: Simple GDI program

Mark Salsbery14-May-07 8:20

Mark Salsbery

14-May-07 8:20

Yes. I should have included that in my response.

Thanks Mike!
Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

read xml with dataset

lavy288314-May-07 4:18

lavy2883

14-May-07 4:18

Hello, I have an Xml and I want to put data from it in tables how can I do this ...please if you have an idea of example or something like this..help me...thanks

Re: read xml with dataset

David Crow14-May-07 4:20

David Crow

14-May-07 4:20

Are you wanting to know how to parse the XML file?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: read xml with dataset

lavy288314-May-07 4:38

lavy2883

14-May-07 4:38

I want to know how can I put data from XML in a table so I can use this data...in may code in c++

Re: read xml with dataset

David Crow14-May-07 4:49

David Crow

14-May-07 4:49

lavy2883 wrote:
I want to know how can I put data from XML...

So are you already parsing the XML file?

lavy2883 wrote:
...so I can use this data...

Have you successfully created the database and table(s)?

What type of data source (e.g., ODBC, DAO, ADO) are you using?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: read xml with dataset

lavy288314-May-07 5:00

lavy2883

14-May-07 5:00

I created the Xml file...and now I have my function like this...
void readfromfile()
{
String^ strFName = gcnew String("d:\\Contload.xml");
DataSet^ ds = gcnew DataSet();
DataTable^ table;
DataRow^ row;
int i;

try
{
ds->ReadXml(strFName);
DataRowCollection^ dr = ds->Tables[0]->Rows;
}
finally
{
delete strFName;
}

}
but I don't know how to do next....to put the data from the Xml in Tables[]
I created an for like...

for (i=0; i<ds->Tables->Count; i++)
{
table = ds->Tables->Item[i];...................
.......}but it give me an error :

Error 6 error C2039: 'Item' : is not a member of 'System::Data::DataTableCollection' ...

Re: read xml with dataset

David Crow14-May-07 5:04

David Crow

14-May-07 5:04

So wouldn't it make more sense to ask your queston in the Managed C++ forum?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: read xml with dataset

led mike14-May-07 5:06

led mike

14-May-07 5:06

You have another error. this is the C++/MFC forum and does not pertain to .NET development. There is a C++/CLI forum for those subjects. Also see the many, many, many Database articles for C# here on CodeProject. They will show how to work with database in the .NET platform.

led mike

Re: read xml with dataset

Hamid_RT14-May-07 6:02

Hamid_RT

14-May-07 6:02

led mike wrote:
You have another error. this is the C++/MFC forum

But why another error? Smile | :)

WhiteSky

dll inside the exe

Russell^'14-May-07 4:13

Russell^'

14-May-07 4:13

Is it possible to compile an exe to include inside of it some dlls.
That is: my exe size is less than 1MB, and I have some dlls (10MB) that the program needs,.....I would like to have only the exe, that probally will be 11MB.
Is there a flag in the project properties?

thanks

Cheers,
Russell

Re: dll inside the exe

David Crow14-May-07 4:19

David Crow

14-May-07 4:19

Link with the static library.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: dll inside the exe

Russell^'14-May-07 4:26

Russell^'

14-May-07 4:26

Yes...it is exactly what I'm searching for....but I'm not finding the flag on VS. Sigh | :sigh:

Can you tell me the path of this flag?
many thanks.

Cheers,
Russell

Re: dll inside the exe

David Crow14-May-07 4:33

David Crow

14-May-07 4:33

See here.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: dll inside the exe

Cedric Moonen14-May-07 4:46

Cedric Moonen

14-May-07 4:46

DavidCrow wrote:
Link with the static library.

I think this may confuse the OP: when you use a dll, you often have a lib file that is provided with it. But the lib file contains only information about how to load the DLL and you won't be able to use only the lib file.

AFAIK, if you don't have the code of the dll, then I think your only choice is to link dynamically.

Cédric Moonen
Software developer

Charting control [v1.2]

How to be informed/notified of registry modifications

Alexandre GRANVAUD14-May-07 3:41

Alexandre GRANVAUD

14-May-07 3:41

Hi, i need to know when some (or every, if no other way) keys of the windows' registry are modified or added or removed.
I looked for some kind of hooks but didn't manage to do it...
Is there a way to achieve this ?

thanks Wink | ;)

Re: How to be informed/notified of registry modifications

David Crow14-May-07 4:21

David Crow

14-May-07 4:21

Alexandre GRANVAUD wrote:
Hi, i need to know when some (or every, if no other way) keys of the windows' registry are modified or added or removed.

See RegNotifyChangeKeyValue().

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: How to be informed/notified of registry modifications

Alexandre GRANVAUD14-May-07 4:24

Alexandre GRANVAUD

14-May-07 4:24

yeah thanks a lot ! Smile | :)

Re: How to be informed/notified of registry modifications

led mike14-May-07 4:45

led mike

14-May-07 4:45

Is Microsoft still hiding that stuff in the documentation?

led mike

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