C / C++ / MFC

Re: How to speed up Ultimate Grid with 8000 rows ?

Rajkumar R12-Mar-08 4:07

Rajkumar R

12-Mar-08 4:07

I never used these grid stuffs, but generally can't you give only the data to the grid which are visible at a certain time. I think from 8000 items some 100 will be visible at a time, if 100 is visible buffer 200 items and give 100 items to controls and when at some threadshold of 50 items update the next 200 items. like that. I don't no whether it is feasible, controls like ListView, TreeView can be made to do this kind of optimisation.

Re: How to speed up Ultimate Grid with 8000 rows ?

Rajesh R Subramanian12-Mar-08 3:55

Rajesh R Subramanian

12-Mar-08 3:55

Anna Katarina wrote:
I guess I need to setup a custom datasource.

Did I not tell you that[^]? Smile | :)

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: How to speed up Ultimate Grid with 8000 rows ?

Anna Anna12-Mar-08 5:43

Anna Anna

12-Mar-08 5:43

Yeah, you did ...
I'm just struggling how I get the CObList from my doc into the custom data source. There is no "open" functionality necessary. This is already done by the framework (opening of a DBF-File) and I don't want to rewrite most the original doc/view/architecture code. I just wanted to attach the grid to the view to make the view display nicer and easier to read. But the Get/Set cell procedure takes to much time for 8000 rows.

Thanks for all your suggestions so far, Anna

Re: How to speed up Ultimate Grid with 8000 rows ?

Maximilien12-Mar-08 3:05

Maximilien

12-Mar-08 3:05

Use the data source (also known as a virtual mode).

We use the ultimate grid with thousands of rows (20000+) and do not see any performance issues.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Zooming a selected point of an Bitmap Image using MFC and OpenGL

jagannathan thiruvengadathan11-Mar-08 23:15

jagannathan thiruvengadathan

11-Mar-08 23:15

Hello

I have developed an application, which load the Bitmap Image as texture using openGL. My question is, how to zoom a particular point of an image when i click using the mouse left button. Will any body help by providing the suitable source code or Link , so that it help me a lot

I am using VC++ ( MFC's MDI ) and OpenGL .

Regards

Jagannathan

Re: Zooming a selected point of an Bitmap Image using MFC and OpenGL

Rajesh R Subramanian12-Mar-08 0:19

Rajesh R Subramanian

12-Mar-08 0:19

See if this[^] helps.

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: Zooming a selected point of an Bitmap Image using MFC and OpenGL

Nathan Holt at EMOM12-Mar-08 5:56

Nathan Holt at EMOM

12-Mar-08 5:56

jagannathan thiruvengadathan wrote:
Hello

I have developed an application, which load the Bitmap Image as texture using openGL. My question is, how to zoom a particular point of an image when i click using the mouse left button. Will any body help by providing the suitable source code or Link , so that it help me a lot

I am using VC++ ( MFC's MDI ) and OpenGL .

Regards

Jagannathan

I had a similar problem when writing Clear Focus. I had to write code to reverse the OpenGL transform to convert a point on the screen to a ray in the 3D model. Then I used simple ray tracing to find which point on the 3D model I was pointing to. It helped to provide a marker object (in my case, just a glPoint) that always follows the mouse pointer so that you can see which point you'll be clicking.

Nathan

Query Regarding Reading XML files in VC++

Rahul Vaishnav11-Mar-08 22:54

Rahul Vaishnav

11-Mar-08 22:54

Hello...

I am using DOM for XML parsing.Size of XML is not too much it is 2 Mb at the max.but structure is much complecated.
Parsing & Reading XML functions are taking too much time.

please tell me how can I Parse & Read the XML faster.

please help me... Frown | :(

Thanks

Re: Query Regarding Reading XML files in VC++

ThatsAlok12-Mar-08 1:02

ThatsAlok

12-Mar-08 1:02

Rahul Vaishnav wrote:
please tell me how can I Parse & Read the XML faster.

look for other parser like tinyxml ! or might be you have to optimize your code!

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Never mind - my own stupidity is the source of every "problem" - Mixture

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VC Forum Q&A :- I/IV
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How to draw an image with an angle using Graphics.DrawImage()?

TooShy2Talk11-Mar-08 22:53

TooShy2Talk

11-Mar-08 22:53

Hi,

I wanted to draw an image with an angle

____
| | |
| | |
----

to

. ____
. / / /
/ / /
----

Is it possible using Graphics.DrawImage()?
How will I do it?

Please comment.
Thank you.

Re: How to draw an image with an angle using Graphics.DrawImage()?

Mark Salsbery12-Mar-08 5:31

Mark Salsbery

12-Mar-08 5:31

You can use Graphics::RotateTransform()[^] before calling DrawImage().

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How to draw an image with an angle using Graphics.DrawImage()?

TooShy2Talk12-Mar-08 15:29

TooShy2Talk

12-Mar-08 15:29

Ok, Thank you very much.

Doubt in pointers to member functions

C.P.Rajesh11-Mar-08 22:45

C.P.Rajesh

11-Mar-08 22:45

In the code below '(a.ptrToFun)()' function call gives syntax error where as '(a.*ptr)()' doesnot.
Can someone explain what the problem is?

class A
{
public:
void AFun(){ cout<<"A Fun"<<endl; }
void (A::*ptrToFun) ();

};

int main()
{
A a;

a.ptrToFun = a.AFun;

(a.ptrToFun)();

void (A::*ptr) ();
ptr = a.ptrToFun;
(a.*ptr)();
return 0;
}

Re: Doubt in pointers to member functions

Iain Clarke, Warrior Programmer11-Mar-08 23:34

Iain Clarke, Warrior Programmer

11-Mar-08 23:34

Well, if you know the correct syntax, and you get the right functionality, then there isn't really any problem.

Pointers to member functions have complex syntax.

Feel proud you've mastered it, and move on.

Iain.

Iain Clarke appears because ^CPallini still cares.

Re: Doubt in pointers to member functions

C.P.Rajesh12-Mar-08 0:21

C.P.Rajesh

12-Mar-08 0:21

Can you please give the right syntax and explain why it is so?

Re: Doubt in pointers to member functions

Iain Clarke, Warrior Programmer12-Mar-08 0:33

Iain Clarke, Warrior Programmer

12-Mar-08 0:33

Didn't you already work out the correct syntax for yourself? You're better placed to help *me* now.

Iain.

Iain Clarke appears because ^CPallini still cares.

Re: Doubt in pointers to member functions

C.P.Rajesh12-Mar-08 0:43

C.P.Rajesh

12-Mar-08 0:43

yes , I got the syntax. The syntax is (a.*(a.ptrfun))(). But i am not able to understand why this is so complex? If you have any explanation for this, kindly reply.

Re: Doubt in pointers to member functions

Maxwell Chen12-Mar-08 1:30

Maxwell Chen

12-Mar-08 1:30

Let me have a try... Big Grin | :-D

(a.*(a.pF))()
  
// 1. (a.*(<font color="red">a.pF</font>))()
//    if it is changed to (a.*(<font color="red">pF</font>))(),
//    the compiler will look for local variables instead of members of a object.
// 2. operator <font color="red">.*</font> is to dereference a pointer to member.
// 3. <font color="red">(</font>a.*(a.pF)<font color="red">)</font>()
//    this pair of parenthesis is to tell the compiler that 
//    we are going to call a function via pointer.

Maxwell Chen

Re: Doubt in pointers to member functions

Michael Dunn12-Mar-08 19:46

Michael Dunn

12-Mar-08 19:46

(a.*ptr)() means "take the object a and the method pointed to by ptr, then call that method using a as this". The "use a as this" part is where the complexity comes from. You can't just call ptr() because you haven't said which object to use as this.

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

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Selected File Path

john563211-Mar-08 21:48

john5632

11-Mar-08 21:48

Hi,

If I select any file on window desktop or from any where in windows explorer then how can I get the selected file path?

Re: Selected File Path

ptr_Electron11-Mar-08 23:12

ptr_Electron

11-Mar-08 23:12

u can use GetFilePath()

Re: Selected File Path

David Crow12-Mar-08 2:45

David Crow

12-Mar-08 2:45

pther wrote:
If I select any file...in windows explorer then how can I get the selected file path?

Right-click the file and select Properties.

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

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

Re: Selected File Path

john563212-Mar-08 22:21

john5632

12-Mar-08 22:21

I want to achive this through programming.

Re: Selected File Path

David Crow13-Mar-08 2:12

David Crow

13-Mar-08 2:12

Read Michael Dunn's articles on shell extensions.

ListView

john563211-Mar-08 21:41

john5632

11-Mar-08 21:41

Hi,

How can I select all item of ListView?

I used :

for(int i=0;i<ListCtrl.GetItemCount();i++)
ListCtrl.SetSelectionMark(i);

But it do not show the selection color.

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