Re: CImageList - C / C++ / MFC Discussion Boards

Shamoon13-Aug-02 5:41

13-Aug-02 5:41

Brian Azzopardi wrote:
The number of clients supported will depend on the OS,

Windows 2000

Brian Azzopardi wrote:
how fat the packets are

Infact Instant messaging server has small packets.

Brian Azzopardi wrote:
the transport protocol (i.e. whether UDP or TCP)

We use TCP

Re: IM Server

Brian Azzopardi13-Aug-02 21:33

Brian Azzopardi

13-Aug-02 21:33

IM newbie developer wrote:
Windows 2000

Hehe! Good luck. If you insist on using Win2k use either Win2K Server or Win2K Advanced Server. Their net code (as the name implies) is tuned for server stuff.

IM newbie developer wrote:
Infact Instant messaging server has small packets
Not necesarily. Depends on what features you want to support. But generally yes the packets are small. Analyse the traffic patterns.

IM newbie developer wrote:
We use TCP

Bad idea. Use UDP as it consumes less bandwidth and also uses much less resources server-side. Using UDP you can support much more connections, the limiting factor being the CPU and the network pipe.

bibamus, edamus, cras moriemur

[eat, drink, for tomorrow we die]

Unable to get CRgn....

Nilesh Karkhanis13-Aug-02 1:09

Nilesh Karkhanis

13-Aug-02 1:09

Hi Friends, Smile | :)

I'm facing some problem while creating a region from the path that is selected in the given device context.

I'm doing following steps

1. Getting the DC
2. Set the font size and background mode
3. Call beginpath
4. Call the text out method
5. Calling the endpath
6. making a call to CreateFromPath

Now if I use any other function like say rect or ellipse then CreateFromPath() gives me a valid region but if I use the textout it gives me a null region I'm unable to figure it out.. Confused | :confused:

it would be great if anyone can help me out... Cool | :cool:

Thanks

Nilesh

Re: Unable to get CRgn....

Space Ace13-Aug-02 1:18

Space Ace

13-Aug-02 1:18

Actually I can't understand what for you need to convert some text into a path Smile | :)

But it seems to me that each letter of your text is a subpath and you should close each subpathwith the help of CloseFigure function. (Petzold "Programming Windows 95", Chapter 4)

Hope this helps

Coloring List Control Items

KrishnaRaj13-Aug-02 0:36

KrishnaRaj

13-Aug-02 0:36

How can I change the color of a List Control Item. My list control is having check box. I want to change the color of the list control item on checking and unchecking event of the check box.

Re: Coloring List Control Items

Tomasz Sowinski13-Aug-02 0:46

Tomasz Sowinski

13-Aug-02 0:46

Use custom draw. There should be an article in the listview section right here on CP.

Tomasz Sowinski -- http://www.shooltz.com

What is "scratch" and why can everything be made from it?

CImageList

Zizilamoroso13-Aug-02 0:00

Zizilamoroso

13-Aug-02 0:00

I've got some questions regarding the CImageList:

initialisation code:

m_pImageList=new CImageList();
m_pImageList->Create(16,16,ILC_COLOR8,0,4);<br>

m_pImageList->Add(AfxGetApp()->LoadIcon(IDI_ICON_FOLDER_DESELECTED));
m_pImageList->Add(AfxGetApp()->LoadIcon(IDI_ICON_FOLDER_SELECTED));
m_pImageList->SetBkColor(CLR_NONE);<br>

m_ctrlTree.SetImageList(m_pImageList,TVSIL_NORMAL);

population code:

m_hTreeItem=m_ctrlTree.InsertItem(TVIF_TEXT,lpszName,0,1,0,0,0,m_hParentTreeItem,NULL);

2 questions:

I've used 256-color transparent icons, but they show up with a black background, although my treecontrol has a white background. Why? Do I have to use bmp instead?

It will always show the first icon, whether the node is selected or not. Why? Do I have to do a special repaint when a node is selected?

tnx.

[VISUAL STUDIO 6.0] [MFC] [WIN98/2]

Bluute tette! Dead | X|

Re: CImageList

Zizilamoroso13-Aug-02 0:04

Zizilamoroso

13-Aug-02 0:04

sorry, too quick...

I've added TVIF_SELECTEDIMAGE next to TVIF_TEXT Poke tongue | ;-P

Yet the background...

[VISUAL STUDIO 6.0] [MFC] [WIN98/2]

Bluute tette! Dead | X|

CString Format method

Anonymous12-Aug-02 23:58

Anonymous

12-Aug-02 23:58

Hi,

I'm trying to control the number of values displayed after the decimal point in a CString. I have a variable which holds the number of values I wish to see after the decimal point. Is there any way of using this variable in the Format method? So rather than having:

x.Format(_T("%.5f"), number)

I would like the 5 ( or whatever number ) to be replaced by my variable.

Thanks.

Re: CString Format method

Christian Graus13-Aug-02 0:01

Christian Graus

13-Aug-02 0:01

CString s;

s.Format("%%.%df", 5")
s.Format(s, .2346324523);

The idea is that the double %% gets turned into a single one, and the single one gets used to put your value in.

Christian

We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )

Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002

Re: CString Format method

Anonymous13-Aug-02 1:30

Anonymous

13-Aug-02 1:30

I keep getting a run-time error.

My code is:

strx.Format(_T("%%.%f"), signif);
strx.Format(strx, m_nMolarity);

where signif is the variable that I want to use to specify the number of decimal places after the point and m_nMolarity is the variable which requires formatting.

Have I misinterpreted your code?

Thanks

Re: CString Format method

Christian Graus13-Aug-02 1:34

Christian Graus

13-Aug-02 1:34

You lost the d.

"%%.%df", signif formats to
%.5f if signif = 5;

then format that with m_nMolarity.

Christian

We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )

Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002

Re: CString Format method

Jon Hulatt13-Aug-02 2:29

Jon Hulatt

13-Aug-02 2:29

What a cunning stunt! I'm very impressed.

STL is a religeon. Enquiries to Reverend Christian Graus

Re: CString Format method

[CoY0te]13-Aug-02 1:46

[CoY0te]

13-Aug-02 1:46

Yo've missed one little thing:
You have: "%%.%f", and You should have "%%.%df"
And of course signif must be an integer value;
"%%.%f" tries to interpret your signif as floating poin value and it doez not produce the f char for m_nMorality.
"%%.%df" will produce "%.<signif>f"

[ CoY0te ]
Railgun is like a Gilette Mach 3 - it does the job with one, easy stroke.

Re: CString Format method

jbarton13-Aug-02 2:50

jbarton

13-Aug-02 2:50

Hi,

The easiest way to do this is to use the '*' modifier in your format string. This allows you to specify the number of digits with a variable.

The following will format using a variable number of digits:

int precision = 5;
x.Format( _T("%.*f"), precision, number );

You can also use a * for the width of the field, so the following will set the width and precision:

int width = 10;
int precision = 3;
x.Format( _T("%*.*f"), width, precision, number );

Best regards,
John

Byte Alignment

solosnake12-Aug-02 23:17

solosnake

12-Aug-02 23:17

Hello

I'm having some problems with byte alignment. I'm writing a graphics editor for particle effects for games. The effects are edited on a PC and exported to a file which is read by a PlayStation2. The code for the PS2 is compiled under GCC, the editor with VC++ 6.0 (Service Packs installed).

For memory reasons I want to be able to use the file I load as the structure directly, so it must be stored witht the correct byte alignment to be correctly read by the PS2 (and to benefit from possible later VPU optimisations). I have set the VC++ project settings to be 16 byte aligned by default. I have also used #pragma pack(16) before critical structures.

I noticed however that for some x87 asm I wrote that the structures were not being 16 byte aligned. VC++ seemed to be completely ignoring ALL my efforts to force it to align structures.

Now when reading the structure, if I tell gcc that the structure is 16-byte aligned (using the __attribute__(align(16)) directive) the structure is read incorrectly. If VC++ had written my structure with 16 alignment this should not be the case? However when I switch off the alignment directive on gcc the struct is loaded correctly.

My questions are:
1)
How can I declare a structure in VC++ such that it will have specific alignement? I think it is as follows:
#pragma pack(16) or #pragma pack(push,16) followed by #pragma pack(pop) bracketing the struct declaration. But my experience seems to be to the contrary.

2) How can I check this is actually working?
3) How can I check the alignment of a pointer at runtime?

If anyone has any experiences in this area, and want to tell me about them, please do!

Thanks to anyone who helps,

- solosnake

Re: Byte Alignment

Tomasz Sowinski13-Aug-02 0:40

Tomasz Sowinski

13-Aug-02 0:40

Can you check the size of your struct with sizeof at runtime?

Tomasz Sowinski -- http://www.shooltz.com

What is "scratch" and why can everything be made from it?

Re: Byte Alignment

Anonymous13-Aug-02 1:07

Anonymous

13-Aug-02 1:07

Yes I can, by creating a temporary and examining. Is the idea to see if it changes in VC++ when I change alignment? I'll give it a go.

- solosnake

Re: Byte Alignment

Brian Azzopardi13-Aug-02 4:03

Brian Azzopardi

13-Aug-02 4:03

In my code I use

#define CACHE_LINE  32<br />
#define CACHE_ALIGN __declspec( align(CACHE_LINE) )

to align a variable on the 32byte boundry so that it is AGP cache aligned (I'm writing a game at the mo.). Change the above to 16. Should work.

BTW, how is the Linux Kit for the PS2? Is it any good? I'm thinking of getting it but I'm currently too busy with Opengl to get a crack at the PS2.

bibamus, edamus, cras moriemur

[eat, drink, for tomorrow we die]

Re: Byte Alignment

JT Anderson13-Aug-02 6:45

JT Anderson

13-Aug-02 6:45

Disclaimer: The following statement is not exactly true, but it's close enough for the purpose of this discussion.

#pragma pack only affects the packing of things larger than the specified size. Things smaller than the specified size are packed on their natural boundaries. For example, pragma pack(2) will cause ints, longs and __int64s to be packed on 2-byte boundaries, but won't affect the packing of chars (one-byte boundaries) or shorts (2-byte boundaries in any case).

Perhaps if you were to show us your structure, we'd be able to tell you why you are not getting the expected results.

Under the circumstances, you may want to use pragma pack(1) and put explicit padding in your structure.

Re: Byte Alignment

solosnake14-Aug-02 1:44

solosnake

14-Aug-02 1:44

Hello

This structure causes problems when the PFXVector3 struct is declared with __attribute__(align(16)) in gcc, even when VC++ is set to align on 16 byte boundries.

struct PFXVector3 {<br />
    F32                     x,y,z;<br />
};<br />
<br />
struct PFXEffectBaseData {<br />
    U32                     m_uiLifeTime;<br />
    U32                     m_uiAge;<br />
    U32                     m_uiFlags;    <br />
    CMatrix4                m_matrixRotate;<br />
    PFXVector3              m_v3dGravity;<br />
    PFXVector3              m_v3dPosition;<br />
};

U32 is just a typedef for unsigned 32 bit ints.
F32 is typedef for 32 bit single prec. fp.
CMatrix4 is the house matrix class.

To Brian:
>BTW, how is the Linux Kit for the PS2? Is it any good? I'm thinking of getting it but I'm
>currently too busy with Opengl to get a
>crack at the PS2.

I'm using SN Systems and a genuine Sony Dev Kit here at work. But sometimes I wish I was at home with a Linux Kit Smile | :)

And doing OpenGL....sigh....

Thanks for all feedback again to everyone

- solosnake

1. Simple techniques for dragging/sizing controls | 2. Non cubical dialogs/controls

BlackSmith12-Aug-02 23:08

BlackSmith

12-Aug-02 23:08

1.
I've CEdit and a CButton on a CDialog. The CButton placed on top of the
CEdit. When the CButton is dragged up/down, I wish the CEdit will
streach/shrink, corresponding to the CButton bottom coordinate.

CAN SOMEONE LINK ME TO SOME ARTICLE THAT CAN RESOLVE MY ISSUE???

2.
An article dealing with HOWTO create non-cubical windows/controls (please?)

10XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX a lot

--BlackSmith--

"With the help of all mighty", 2001, Me.

Database Connection with SDK

vin12-Aug-02 22:36

vin

12-Aug-02 22:36

Hi,

Can any one tell me the API's for database connection with SDK. Is there any article which explains this.

Kindly help.

Re: Database Connection with SDK

Ranjan Banerji13-Aug-02 2:38

Ranjan Banerji

13-Aug-02 2:38

I do not believe Windows SDK provides any database connection functionality. You will have to use the ODBC SDK at minimum or native drivers/tools provided by the DBMS vendor or newer connectivity tools likes ADO, OLE DB etc. I am assuming when you said SDK you meant Windows SDK.

Re: Database Connection with SDK

pépé13-Aug-02 3:05

pépé

13-Aug-02 3:05

Hi,

If you use Access, you can use CDao* classes.
hope it helps !

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