C / C++ / MFC

22-Sep-09 4:30

Why would you ever need such a conversion?! What are you trying to do and did the compiler give you such a conversion error? Give that context here and someone might be able to help you.

It is a crappy thing, but it's life -^ Carlo Pallini

agree!

etkid8422-Sep-09 5:55

22-Sep-09 5:55

yea, why would you need to do this?

David

Re: agree!

Rajesh R Subramanian22-Sep-09 6:01

22-Sep-09 6:01

Hi David,

You probably wanted to reply to the OP? Replying to a different message on the thread won't notify the OP about your post. Smile | :)

It is a crappy thing, but it's life -^ Carlo Pallini

oops, my bad

etkid8422-Sep-09 6:10

Re: how to convert char * to char[100]

22-Sep-09 6:10

yea .. F'd that up didn't i

David

Skippums22-Sep-09 8:57

Skippums

22-Sep-09 8:57

char *charArray = new char[100];
char (*temp)[100]((char(*)[100])charArray);

Then temp is a pointer to a char[100] array, so *temp is your array of 100 elements. The following should also work:

char (&temp)[100](*((char(*)[100])charArray));

In this case, temp is just an alias to the array, so you don't have to dereference it prior to accessing its members.

As for the reasons to do such a thing, they are many. One is if you have to create the array using a specialized memory allocation function, such as the case where you are using an external memory manager. For example, when coding for Matlab, you have to use mxAlloc to allocate ANY memory that will persist after your function is called. However, it may be more convenient in code to treat allocated memory as an array. As another example, suppose you create a template function that takes a 3D-array that you want to overload to take a 2D array. In this case, you would have to convert a TYPE[][] to a TYPE[1][][], which is a similar operation. For example,

template<size_t height, size_t width>
void doSomething(double (&darray)[height][width]) {
    ...
}

int main() {
    const size_t height = 100;
    const size_t width  = 100;
    // The following line will NOT compile, but is used only for illustrative purposes
    double* memBlock2D = mxAlloc(height * width * sizeof(double));
    double (&memArray2D)[height][width](*((double(*)[height][width])memBlock2D));
    doSomething(memArray2D);
    return 0;
}

Hope this helps,

Sounds like somebody's got a case of the Mondays

-Jeff

modified on Tuesday, September 22, 2009 3:21 PM

How to get cureent url from firefox address bar...

onlyjaypatel22-Sep-09 3:35

onlyjaypatel

22-Sep-09 3:35

Hi all,

I want to get cureent url from address bar of firefox.

Is there any snippet code to do this?

Thanx,
Jay

access to the task manager

einstein.girl22-Sep-09 3:27

einstein.girl

22-Sep-09 3:27

is there any way to get access to the details of the tasks show in the windows "task manager"? by c++.

Re: access to the task manager

David Crow22-Sep-09 3:34

David Crow

22-Sep-09 3:34

Not with C++. Now if you were interested in some Windows API, there probably is. What did you have in mind?

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

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Re: access to the task manager

kilt24-Sep-09 7:10

kilt

24-Sep-09 7:10

See TaskMgr source code (see on Win32 ng[^]

Sleep

VVVimal22-Sep-09 3:24

VVVimal

22-Sep-09 3:24

Hi
I just tried to call Sleep(1000) in a thread function
But when i tried to

Unit threadFun(LPVOID lparam)
{
while(1)
{
Sleep(1000); // When tried to give break point over here appliacation gets terminates
............
}

}

Can any one give me solution to this

Thanks

David Crow22-Sep-09 3:35

David Crow

22-Sep-09 3:35

VVVimal wrote:
Can any one give me solution to this

Remove the call to Sleep(). It's almost always unnecessary and usually indicates a design flaw.

VVVimal22-Sep-09 4:12

VVVimal

22-Sep-09 4:12

But i need a Sleep() function over there.
Because i need a function to be get called every 1000 milliseconds

David Crow22-Sep-09 4:13

David Crow

22-Sep-09 4:13

VVVimal wrote:
Because i need a function to be get called every 1000 milliseconds

Then use SetTimer(1000).

Maximilien22-Sep-09 4:40

Maximilien

22-Sep-09 4:40

Remember that Windows is not a real-time system, your function might or might not be called at every 1000 milliseconds, depending on what's happening on the OS.

This signature was proudly tested on animals.

Rajesh R Subramanian22-Sep-09 4:28

22-Sep-09 4:28

VVVimal wrote:
Unit threadFun(LPVOID lparam)
{
while(1)
{
Sleep(1000); // When tried to give break point over here appliacation gets terminates
............
}

}

I don't see why should the application "terminate" with this piece of code. (It might have probably helped us if you had given the remaining code within the thread function to see if anything is wrong)

With more than one thread running, may be the issue is somewhere else? Besides that, like David said, remove the unnecessary Sleep call and replace it with something that makes sense of some sort.

It is a crappy thing, but it's life -^ Carlo Pallini

etkid8422-Sep-09 6:15

22-Sep-09 6:15

does the application terminate or does it hang?
i would thing that statement would cause the app to hang... continuous loop with a defined wait time.. is that 1000 seconds or milliseconds it's library specific..??

David

Rajesh R Subramanian22-Sep-09 6:20

22-Sep-09 6:20

David, you again replied to me instead of the OP. You should click reply on the specific message that you want to reply to.

It is a crappy thing, but it's life -^ Carlo Pallini

etkid8422-Sep-09 6:24

22-Sep-09 6:24

my questions are buried below..

David

Chuck O'Toole22-Sep-09 15:26

Chuck O'Toole

22-Sep-09 15:26

I use Sleep() all the time in threaded code, there's no reason it should cause the termination in and of itself.

However, the thread code you show runs in the context of a larger program, notably the main thread which created the thread you show. What is that thread doing? If it exits, it will take the created thread down with it.

Make sure the main code is waiting for this thread to terminate before it does.

chandu00422-Sep-09 21:01

chandu004

22-Sep-09 21:01

VVVimal wrote:
When tried to give break point over here appliacation gets terminates

do you mean, it is getting terminated when you try to debug?

--------------------------------------------
Suggestion to the members:
Please prefix your main thread subject with [SOLVED] if it is solved.
thanks.
chandu.