reading floats in a struct - C / C++ / MFC Discussion Boards

Re: ListBox focus

RomTibi11-Feb-09 5:53

RomTibi

11-Feb-09 5:53

Thank you!

36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.

SUN-TZU - Art of War

Re: ListBox focus

Perspx9-Feb-09 7:38

Perspx

9-Feb-09 7:38

Use the LB_SETTOPINDEX message (or the ListBox_SetTopIndex macro), or the LB_SETCURSEL message (or the ListBox_SetCurSel macro) if you want to select the item (LB_SETSEL to select multiple items) that has been added to the end of the list.

Regards,
--Perspx

"A refund for defective software might be nice, except it would bankrupt the entire software industry in the first year."
-Andrew Tanenbaum

"Einstein argued that there must be simplified explanations of nature, because God is not capricious or arbitrary. No such faith comforts the software engineer."
-Fred Brooks

Re: ListBox focus

RomTibi11-Feb-09 5:53

RomTibi

11-Feb-09 5:53

Thanks!

36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.

SUN-TZU - Art of War

Re: ListBox focus

David Crow9-Feb-09 10:30

David Crow

9-Feb-09 10:30

Another option, although slightly less appealing, is to send the listbox a LB_INSERTSTRING message with 0 as the index.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: ListBox focus

RomTibi9-Feb-09 10:39

RomTibi

9-Feb-09 10:39

This will reverse the order of the messages?

36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.

SUN-TZU - Art of War

Re: ListBox focus

David Crow9-Feb-09 10:40

David Crow

9-Feb-09 10:40

RomTibi wrote:
This will reverse the order of the messages?

Of course it will, hence my opening remark.

Re: ListBox focus

RomTibi11-Feb-09 5:54

RomTibi

11-Feb-09 5:54

Thanks! I finally used your advice.

36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.

SUN-TZU - Art of War

reading floats in a struct

Jon Hulatt9-Feb-09 6:50

Jon Hulatt

9-Feb-09 6:50

Hi all,

I have a struct a bit like this, which is the header to a file on disk:-

struct Header
{
    short a;
    short b;
    short c;
    float floatvalue;
}

I read the header from the disk like this:-

ReadFile(hFile,&header,sizeof(Header),&bytesRead,NULL);

Once I'd done that, the values in a,b,c are as expected, but the floatvalue is not.

However, if I adjust the struct so that instead of float, I have BYTE[4] as follows:-

struct Header
{
    short a;
    short b;
    short c;
    BYTE floatvalue[4];
}

And then after reading the header as before, I do:-

float f;
memcpy(&f,header.floatvalue,sizeof(float));

Then f contains the value expected.

I don't understand why the first version didn't work. Can anyone enlighten me please?

Thanks

Jon

using System.Beer;

Re: reading floats in a struct

Code-o-mat9-Feb-09 7:18

Code-o-mat

9-Feb-09 7:18

Maybe take a look at this[^], i hope it explains what you need explained. Smile | :)

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Re: reading floats in a struct

Jon Hulatt9-Feb-09 7:51

Jon Hulatt

9-Feb-09 7:51

Thank for that, it's clear now.

Looks like a can get around the issue with #pragma pack (2)

using System.Beer;

Re: reading floats in a struct

RomTibi9-Feb-09 10:38

RomTibi

9-Feb-09 10:38

I think that a

#pragma pack (1)

#pragma pack (2)

declaration before the structure's definition would help. Think so?

36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.

SUN-TZU - Art of War

GetAdaptersInfo returns all the Ethernet Cards MAC

spicy_kid20009-Feb-09 4:04

spicy_kid2000

9-Feb-09 4:04

Hello Team,

I have written a C++ program, which will fetch the MAC address using the GetAdaptersInfo, and this program is compiled using gcc of mingw. when i run this program in my PC, this has return valid MAC. Everything fine.

But When I run same program , where I had a wifi card and a LAN card, this program returend both the MAC address. In my program i am chacking for MIB_IF_TYPE_ETHERNET, still it is giving both the MAC.

How do i get only MAC of LAN card ? not wifi / bluetooth card?

Thank you
glamakid

Frown | :(

Re: GetAdaptersInfo returns all the Ethernet Cards MAC

Stuart Dootson9-Feb-09 4:25

Stuart Dootson

9-Feb-09 4:25

You could try using WMI[^] and retrieving <a href="http://msdn.microsoft.com/en-us/library/aa394216%28VS.85%29.aspx" rel="nofollow">Win32_NetworkAdapter</a>[^] instances whose AdapterType is Ethernet 802.3?

WMI at least separates out wireless adapters.

Re: GetAdaptersInfo returns all the Ethernet Cards MAC

spicy_kid20009-Feb-09 4:51

spicy_kid2000

9-Feb-09 4:51

Hello

Thank you . Cant I use the GetAdapter...API itself? I am not good at usign WMI program

glamakid

Re: GetAdaptersInfo returns all the Ethernet Cards MAC

Stuart Dootson9-Feb-09 7:27

Stuart Dootson

9-Feb-09 7:27

The documentation and your experience indicate that you can't. I'm guessing that at that level of abstraction, WiFi is close enough to ethernet that they can be treated the same.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: GetAdaptersInfo returns all the Ethernet Cards MAC

spicy_kid20009-Feb-09 19:02

spicy_kid2000

9-Feb-09 19:02

Hello Stuart,

I am getting both the adapter, but i want only the ethernet adapter. how can i supress the other one ?

Re: GetAdaptersInfo returns all the Ethernet Cards MAC

Stuart Dootson9-Feb-09 21:18

Stuart Dootson

9-Feb-09 21:18

As I said before, I think WIndows treats WiFi (and Bluetooth, judging from what I've seen) as Ethernet interfaces at this level of abstracvtion. You need to find some interface that's closer to the hardware that allows you to make adefinitive statement about whether an interface is 802.3 or not.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Need information about Activex Control functions

John5029-Feb-09 3:16

John502

9-Feb-09 3:16

Hi,
I have inserted media player activex on my dialog box, using OnPositionChangeOcx1 event i am able to get the audio slider bar position, now i want to set the slider position to some where in the slider bar.
I am not able to do that, i don't know which function i have to use for setting, becuase i am very new to this ActiveX environment..

Can any one help me regarding this..?
Your help will be appriciated...

Thanks in advance.....

Thanks
Venkatesh.

Re: Need information about Activex Control functions

led mike9-Feb-09 4:34

led mike

9-Feb-09 4:34

venki502 wrote:
I have inserted media player activex on my dialog box

If you are going to use the media player activeX control in your application you might want to consult the documentation[^]

Re: Need information about Activex Control functions

Stephen Hewitt9-Feb-09 5:13

Stephen Hewitt

9-Feb-09 5:13

I like the "let me Google it" thing. Nice touch. I can't believe I haven't come across it before.

Steve

Re: Need information about Activex Control functions

led mike9-Feb-09 5:17

led mike

9-Feb-09 5:17

Stephen Hewitt wrote:
I can't believe I haven't come across it before.

That's exactly what I said when I saw someone else here had used it. Big Grin | :-D

Displaying exponential value in Edit box

Member 46517419-Feb-09 3:13

Member 4651741

9-Feb-09 3:13

Hi,

I have created one application in VC++, in that am using one edit box to display the values , i hav created a member variable for that edit box in that defined double datatype. My question is , if i get any exponential value, it is not displaying fully, it displays upto the size of the edit box. is there any way to see the exponential value in the edit box

Thanks,
Balaji S

Re: Displaying exponential value in Edit box [modified]

Sarath C9-Feb-09 3:41

Sarath C

9-Feb-09 3:41

I think CEdit is not directly support that. You can use %e or %g to format it as string and set as window text to edit control

e.g

float f = 100.234235454; // some value<br />
CString str;<br />
str.Format( "%e", f );<br />
editCtrl.SetWindowText( str );

-Sarath.
"Great hopes make everything great possible" - Benjamin Franklin

My blog - Sharing My Thoughts

modified on Tuesday, February 10, 2009 5:57 AM

Re: Displaying exponential value in Edit box

Stephen Hewitt9-Feb-09 5:15

Stephen Hewitt

9-Feb-09 5:15

Sarath. wrote:
float f = 100.234235454; // some value
CString str;
str.Format( "%e", f );
editCtrl.SetWindowText( f );

I think you mean this:

float f = 100.234235454; // some value
CString str;
str.Format("%e", f);
editCtrl.SetWindowText(str);

Steve

Re: Displaying exponential value in Edit box

Sarath C9-Feb-09 23:58

Sarath C

9-Feb-09 23:58

Yeap... It was a typo

-Sarath.
"Great hopes make everything great possible" - Benjamin Franklin

My blog - Sharing My Thoughts

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