Re: malloc and free problem. - C / C++ / MFC Discussion Boards

Roger Allen12-Oct-05 13:38

12-Oct-05 13:38

Try changing the 4/3 to 4.0/3.0 so the calulation is done as a double not as an integer, which is currently losing you the 0.3333333

If you vote me down, my score will only get lower

Re: Need Help With Calculation

David Crow13-Oct-05 3:19

David Crow

13-Oct-05 3:19

In addition to Roger's suggestion, I suggest the following to help 'polish' your application:

WackoWolf wrote:
// Integer local to Main to store initial radius value
double r;

Comment (int) does not match code (double).

WackoWolf wrote:
if (r >= 0)

Use a double constant (0.0) here.

WackoWolf wrote:
printf("You Must Enter A Positive Integer!!!! Not A Negative Integer!!!\n");

Again referencing integers.

WackoWolf wrote:
double exponent=3;

Use a double constant (3.0) here.

WackoWolf wrote:
void sphere_volume (double radius)

Another suggestion I might make, although it has no impact on the outcome of your program, is to make this function's parameter const.

void sphere_volume( const double radius );

This ensures that your code does not accidently change the value of the parameter.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Accelerator key issue in hosted ActiveX control

Ian Bowler12-Oct-05 12:35

Ian Bowler

12-Oct-05 12:35

Hello,

I am hosting an activeX control that has its own UI using standard MFC controls. I have a button that has an accelerator key ("&Browse") but the button is not responding to alt+b.

I don't know what the problem is. Perhaps the accelerator message is going to the hosting application and not the activeX control? The accelerator key never works, even when a control in the activeX control has the focus.

Any ideas?

thanks!

-Ian

CResourceException

LighthouseJ12-Oct-05 12:08

LighthouseJ

12-Oct-05 12:08

I'm getting a strange problem that I don't know how to find out what is causing the problem. It's late in this programs' development and I can now use it for it's actual intended purpose instead of testing functionality. After I run it for a while, it slows down and I click Stop in VS. A lot of these come up in the debugging output window:

First-chance exception at 0x7c81eb33 in myprogram.exe: Microsoft C++ exception: CResourceException @ 0x0012f660. Warning: Uncaught exception in WindowProc (returning 0).

I know how to handle exceptions but I don't know how to find out where the exception occurs so I can either fix it or catch it and then handle it properly.

MultiLingual Resource

jim45612-Oct-05 11:54

jim456

12-Oct-05 11:54

Are there any localization tools which would indicate a resource in one language to change when the same resource id is updated in another language in the same RC file?

Jim456

malloc and free problem.

Jader8912-Oct-05 11:47

Jader89

12-Oct-05 11:47

Okay, a little problem here, im doing the following code, all in the same scope:

char* data;
...
data = (char*)malloc(sizeof(char));
memset( data, 0, sizeof(data) );
...
if( data != NULL )
{
free(data); // error here
data = NULL;
}

And i get a debug error, "DAMAGE: after Normal block(#371) at 0x0037F9B0."
Any ideas why im getting this?

Re: malloc and free problem.

Jader8912-Oct-05 11:51

Jader89

12-Oct-05 11:51

Also, at the point where free(data) is called, data = 0xcccccccc.

Re: malloc and free problem.

Anonymous12-Oct-05 12:02

Anonymous

12-Oct-05 12:02

Your problem:

// This allocates ONLY 1 byte, why you try to allocate only 1 byte??
data = (char*)malloc(sizeof(char));

// However this is memsetting 4 bytes which is whats causing the problem...
memset( data, 0, sizeof(data) );

// Code should read, only set up 1 byte
memset( data, 0, sizeof(char));

Re: malloc and free problem.

Jader8912-Oct-05 12:08

Jader89

12-Oct-05 12:08

wow, dumb error, thanks alot.

Re: malloc and free problem.

LighthouseJ12-Oct-05 12:10

LighthouseJ

12-Oct-05 12:10

Have you considered using new/delete instead?

Re: malloc and free problem.

sunit512-Oct-05 20:43

sunit5

12-Oct-05 20:43

memset( data, 0, sizeof(*data) );

Visual C++ .Net Dialog Help Wizard

Cubzfan12-Oct-05 11:14

Cubzfan

12-Oct-05 11:14

Hi,

I work on a large App created using C++ in VS6. We have since moved to .Net and our code is unmanaged. Several of our dialogs have an overwhelming number of controls. I have been tasked to create a wizard which will walk the user step-by-step through completion of the dialog. The current dialog must stay in tact while the wizard will break the dialog into smaller "user friendly" chunks with explanation text. The idea is to have only the current dialog for experienced users and the wizard for new users. The user will have to add text to edit boxes and select from combo boxes etc. I have to do this for several dialogs. I'm trying to figure out the best way to do this without duplicating work. I'm toying with the idea of using a property sheet.

Suggestions??

Thanx

Cubzfan

EnumProcesses question

Gary Wheeler12-Oct-05 10:43

Gary Wheeler

12-Oct-05 10:43

The EnumProcesses function in the PSAPI library enumerates processes. Unfortunately, it does not include in that enumeration processes run by other users. Does anyone know of a way to enumerate all the processes in the system?

Software Zen: delete this;

Re: EnumProcesses question

Prakash Nadar12-Oct-05 22:45

Prakash Nadar

12-Oct-05 22:45

probably you can do it only if you have admin rights.

-prakash

Re: EnumProcesses question

Gary Wheeler13-Oct-05 2:18

Gary Wheeler

13-Oct-05 2:18

Thanks for your response.

In this case, administrator rights doesn't appear to help (the logged-in user is an administrator).

I've found an alternate method of resolving my issue (it involves an installer for a service that runs under a separate account) using the service control manager directly.

Software Zen: delete this;

Re: EnumProcesses question

ThatsAlok13-Oct-05 1:38

ThatsAlok

13-Oct-05 1:38

Gary Wheeler wrote:
Does anyone know of a way to enumerate all the processes in the system?

Hi Mr. Gary,
you can try CreateToolhelp32Snapshot(..),Process32First and Process32Next api

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Re: EnumProcesses question

Gary Wheeler13-Oct-05 2:20

Gary Wheeler

13-Oct-05 2:20

Thanks for your response. I'll keep it in mind.

I've found an alternate method of resolving my issue (it involves an installer for a service that runs under a separate account) using the service control manager directly.

Software Zen: delete this;

Creating executable files?

Tara1412-Oct-05 10:34

Tara14

12-Oct-05 10:34

Hi,

I am a bigner in VC++ programming (started lerning only in March 2005 with visual stdio 6).

I request some help.
I have created a small database related application for a friend using CDAORecordSet. I made the data connection to Access (ie data is stored, added to and retrived from an access file and displaed on to a listView). I build the application seting the build configuration as 'release'. Then I copied the exe file and the access file on to my friend's computer and tried to run it.

I get the message "Unable to initialise DAO/jet engine".

Please tell me what to do now? Do I have to incorporate the jet engine in the program. If so, how do I do it? Or is there something else that must be done, like create a setup file.
Please, someone, tell me what to do? I really need some help.

Thank you,
Tara

Re: Creating executable files?

dave_dv12-Oct-05 11:06

dave_dv

12-Oct-05 11:06

You have to check register "HKEY_LOCAL_MACHINE\Software\Microsoft\Jet\3.5\Engines exists"

If you don't have this fold you have to install Jet Engine. It's depend on OS you can get download in this site http://www.microsoft.com/downloads/results.aspx?productID=&freetext=Jet%204.0%20Service%20Pack&displaylang=en[^]

One more thing is before check DAO/Jet infromation

bool DAOInstallCheck()
{
HKEY hRet;

bool bBool=false;

if (RegOpenKeyEx(HKEY_LOCAL_MACHINE,
"Software\\Microsoft\\Jet\\3.5\\Engines",
0,KEY_QUERY_VALUE, &hRet) == ERROR_SUCCESS)
{
bBool = true;
RegCloseKey(hRet);
}

return bBool;
}

if DAOInstallCheck())
// Message Return Install require
else
// DAO already Install

Have a nice day

-- modified at 17:22 Wednesday 12th October, 2005

Bitmap over video problem (VMR9)

Storm-blade12-Oct-05 10:16

Storm-blade

12-Oct-05 10:16

Hi,
I'm trying to show a bitmap image (blended) over a background video using VMR9, this works fine... Big Grin | :-D

Except,
The bitmap is only visable in the areas of the client window which the video is covering. (as the video is letterboxed). D'Oh! | :doh:

Is it possible to allow the overlay bitmap to fill the entire window...
And if not, what over approach should I be looking for to acheive this?

Thanks...
Simon.

Re: Bitmap over video problem (VMR9)

Storm-blade12-Oct-05 11:05

Storm-blade

12-Oct-05 11:05

ooook... figured it out Smile | :)

I've turned off letterbox mode, and manually resized the video itself into the client area, this allows the VMR to render the bitmap to the entire client area.... Laugh | :laugh:

Thanks for listening Big Grin | :-D

Re: Bitmap over video problem (VMR9)

Trollslayer12-Oct-05 21:58

Trollslayer

12-Oct-05 21:58

Thanks for letting us know the solution - I sometimes look here to see common problems (and solutions) that people come across.

Elaine Rose | [Rose]

The tigress is here Big Grin | :-D

Add color on the Dimmed text of disabled controls?

y22zhou12-Oct-05 9:08

y22zhou

12-Oct-05 9:08

Hi,

My clients like to see the texts instead of the dimmed texts on disabled controls such as check box, radio button, combo box, and edit box in a C++/MFC dialog box. The texts on enabled controls are black.

In order to differentiate disabled controls from enabled controls (black texts), I would like to add some color (blue) on the disabled control texts.

Can you tell me the existing or potential solutions?

Thank you very much! Smile | :)

Shelley

-- modified at 16:20 Wednesday 12th October, 2005

Re: Add color on the Dimmed text of disabled controls?

David Crow12-Oct-05 9:59

David Crow

12-Oct-05 9:59

y22zhou wrote:
My clients like to see the texts instead of the dimmed texts on disabled controls such as check box, radio button, combo box, and edit box in a C++/MFC dialog box.

This would seem to be counterintuitive. For example, say you set the text of these disabled controls to red, and the user went in and changed their theme to display red text for controls. How would they differentiate between a disabled control and an enabled control?

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

add message to jpeg file

kevincwong12-Oct-05 8:52

kevincwong

12-Oct-05 8:52

Hi,

I have a jpeg file. I would like to embed some text to it.
The text messages will be right above the jpeg image.

For example:

Smiley face
Big Grin | :-D

Can someone g:|ive me some ideas about how to do it?

Thanks,

Kevin

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