Hi all,
I have a problem on release memory.
If I delcare the following pointer to pointer char, how can I free the
allocated memory ?
let say "myVar = 20" <---actually it is not a constant, but now I set
it to 20.
char **tempStr=(char**)new char[sizeof(char*)*myVar];
...
....do something to set value to each char pointer
...
I try to delete it by the following statement.
for (int i=0; i< myVar; i++)
delete tempStr[i];
BUT it is violet my program.
Can anybody tell me how to release memory in such case.
Thank you very much.
Alan 5 4418
"alan" <ch***********@i-cable.com> wrote in message
news:7b**************************@posting.google.c om Hi all,
I have a problem on release memory.
If I delcare the following pointer to pointer char, how can I free the allocated memory ?
let say "myVar = 20" <---actually it is not a constant, but now I set it to 20.
char **tempStr=(char**)new char[sizeof(char*)*myVar]; .. ...do something to set value to each char pointer
You need to show how you do this.
I try to delete it by the following statement.
for (int i=0; i< myVar; i++) delete tempStr[i];
BUT it is violet my program.
Can anybody tell me how to release memory in such case.
Do you allocate memory with new? You only delete memory allocated with new.
I suggest you show a complete compileable example illustrating the problem.
--
John Carson
1. To reply to email address, remove donald
2. Don't reply to email address (post here instead)
"alan" <ch***********@i-cable.com> wrote in message
news:7b**************************@posting.google.c om... Hi all,
I have a problem on release memory.
If I delcare the following pointer to pointer char, how can I free the allocated memory ?
let say "myVar = 20" <---actually it is not a constant, but now I set it to 20.
char **tempStr=(char**)new char[sizeof(char*)*myVar]; .. ...do something to set value to each char pointer
I feel like what you are doing is not what you want to do. If you want to
create an array of 20 char pointers on the free store you have to do:
char **tempstr=new char *[20];
Ioannis Vranos
[snip] char **tempStr=(char**)new char[sizeof(char*)*myVar]; .. ...do something to set value to each char pointer
Allocate like this -
char **tempStr=new char *[20];
I try to delete it by the following statement.
for (int i=0; i< myVar; i++) delete tempStr[i];
Delete like this -
delete [] tempStr;
-Sharad
"alan" <ch***********@i-cable.com> wrote in message
news:7b**************************@posting.google.c om... Hi all,
I have a problem on release memory.
Problems releasing memory are usually caused by a bug earlier in the
program, not by releasing the memory in the wrong way.
john
alan <ch***********@i-cable.com> spoke thus: char **tempStr=(char**)new char[sizeof(char*)*myVar];
As others stated, this is wrong. It looks like you thought you were
using malloc:
char **tmpStr=(char**)malloc( sizeof(char*)*myVar );
Prefer the correct usage of new to the above, however.
.. ...do something to set value to each char pointer ..
This "something" is actually important. For example, if the something
involves strdup() (just a wild guess)...
delete tempStr[i];
....this is also wrong. Delete things you've allocated with new;
free() things you've allocated with malloc() (such as strdup()'ed
strings). malloc/delete and new/free combinations should NEVER be
used.
Can anybody tell me how to release memory in such case.
If you post code that demonstrates the problem, I'm sure we can help.
On the other hand, why not just use std::vector<std::string>? Then
you don't have to worry about releasing memory at all.
--
Christopher Benson-Manica | I *should* know what I'm talking about - if I
ataru(at)cyberspace.org | don't, I need to know. Flames welcome. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
by: gchandran |
last post by:
Hi All,
Problem: Call to DOMDocument::getElementsByTagName() in a loop causes
growth in memory consumption?
Consider the following lines of code which simulates the problem
that I am facing....
|
by: spiff |
last post by:
We are migrating from VC++ 6 to VC++ 2003. It is a plain, unmanaged application with both C and C++ source. When running the debug build, even outside the debugger, the memory allocation/deallocation...
|
by: babak |
last post by:
Hi everybody
I'm working with a project in embedded Visual Studio 4 and I have a
general problem which I hope that somebody can help me with. My problem
is the following:
My project works fine in...
|
by: slaprade |
last post by:
I am loading a weeks worth of web logs into a dataset using Imports Microsoft.Data.Odbc
These are text - fixed length fields so I have written a schema for them. The adapter fill looks like this...
|
by: Rodrigue |
last post by:
I have code where I populate a data table using visual basic.net code. I call
the clear method on the table but it does not seem to release the memory.
When I populate the table again, the memory...
|
by: ABC |
last post by:
How should I to release the pop-up page object on memory when I close the
page?
I have main page, which will open a popup webpage when a button clicked. In
the first opened pop-up page, it is...
|
by: Epetruk |
last post by:
Hello,
I have a problem where an application I am working on throws an
OutOfMemoryException when I run it in Release mode, whereas it doesn't do
this when I am running in Debug.
The...
|
by: Dave Johansen |
last post by:
I just converted a solution from Visual Studio 2003 to Visual Studio
2005 and the Debug mode seems to be running just fine, but the Release
mode crashes on the following code:
std::ifstream...
|
by: Dmitriy V'jukov |
last post by:
On Jun 16, 3:09 pm, Anthony Williams <anthony....@gmail.comwrote:
Yes, I've already read this. It's just GREAT! It's far more useful and
intuitive.
And it contains clear and simple binding...
|
by: Charles Arthur |
last post by:
How do i turn on java script on a villaon, callus and itel keypad mobile phone
|
by: ryjfgjl |
last post by:
In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...
|
by: Hystou |
last post by:
There are some requirements for setting up RAID:
1. The motherboard and BIOS support RAID configuration.
2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...
|
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers,...
|
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing,...
| |