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Something like (which might be overkill):
char **arr = new char*[l.size()];
int y = 0;
for (list<string>::iterator x = l.begin(); x != l.end(); x++)
{
string str = *x;
arr[y] = new char[str.length() + 1];
strcpy(arr[y], str.c_str());
y++;
}Now you can pass arr and l.size() as the arguments to your function.
You could also do something like:
void foo( LPARAM lParam )
{
list<string> *l = (list<string> *) lParam;
}
...
list<string> l;
foo((LPARAM) &l);
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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Thanks! That is very similar to what I had been working towards (apart from the fact it works!)
So now, in my callback I am using:
char **arr = (char**)lParam;
int count = sizeof(arr) / sizeof(*arr);
But this gives me 1 when it should be 2, what is the correct way to determine the size of the array?
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__DanC__ wrote: But this gives me 1 when it should be 2...
Right, because a pointer is four bytes in size.
__DanC__ wrote: ...what is the correct way to determine the size of the array?
As a second argument to your function.
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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I do not have the option of a second argument to the function as it is a callback. All I can pass is the pointer as an LPARAM
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So put the array and the count in a structure and pass the address of that structure.
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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Why don't you just pass the address of the std::list as the LPARAM? If you need a copy at the other end, copy the std::list and use the address of the copy.
"The secret of happiness is freedom, and the secret of freedom, courage."
Thucydides (B.C. 460-400)
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I didn't realise that was possible. How would I copy the list? I tried CopyMemory before I started down this route with no luck so decided the pointer array was probably the way to go.
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It's a while since I've used std::list so you're probably best looking at the docs but I guess you could simply create a second std::list, then iterate through the first one, use CopyMemory or whatever for each item and then append it to the second list. I'm not sure if you can simply assign one list to another or pass the first list to a constructor of the second. I suspect it depends on what your list contains, simple POV type, complex types, pointers, etc.
Reminds me I need to look into the std containers once again. I've never really got on with them or used them on a regular basis.
"The secret of happiness is freedom, and the secret of freedom, courage."
Thucydides (B.C. 460-400)
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Do you really need to copy the list? Why not something like this:
void IWantAList(LPARAM lp)
{
using namespace std;
list<string> *pList = reinterpret_cast<list<string>*>(lp);
}
void SendList()
{
using namespace std;
list<string> list;
IWantAList(reinterpret_cast<LPARAM>(&list));
}
Steve
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I want to move an Object to a particular point if a condition is met. I use the variable "pWaypointNum1" to refer the position of the object and "mCharacter to refer the Object. Here's the code:
if(pWaypointNum1 < 6)
{
if((pWaypointNum1 > 1) && (pWaypointNum1 <= 3))
{
test1 = 6;
}
else
{
test1 = 3;
}
mCharacter1->GoToWaypoint(pWaypointNum1);
pWaypointNum1++;
}
My problem is:
I want to increment the variable pWaypointNum1 by 1 as the Object moves from one position to the next position. But it increments in a sudden. How to increment the pWaypointNum1 variable as the Object moves from one position to the next position?
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T.RATHA KRISHNAN wrote: But it increments in a sudden.
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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Can you give us some more context?
Regards,
--Perspx
"The Blue Screen of Death, also known as The Blue Screen of Doom, the "Blue Screen of Fun", "Phatul Exception: The WRECKening" and "Windows Vista", is a multi award-winning game first developed in 1995 by Microsoft" - Uncyclopedia
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I want to set the speed of the object to 6 if it's travelling between the 1st and 3rd positions. But it's 6 from start to end. How can I set the speed for in between positions(1st to 3rd)? Pls refer to the code above.
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Wow, that's a hell of a cryptic question. You have to get out of your code for a while and think that we can't see your screen. For a C++ developper (which lot of us are, obviously, except the ones that get lost on this board), an object is a class. And you can't move a class or make it travel. I guess you are doing something on the screen and displaying something that moves but it is very vague. Now, for incrementing a variable, either you increment it or you don't. You don't have another choice. Maybe you are using a float and would like to have a constant increase of your value when the thing you move on the screen is moving, but then you need to handle it yourself and it really depends a lot on how you are moving those things. When you move such a thing, increment a bit your variable at the same time.
That's about all the help we can provide giving your cryptic question.
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Pardon me! I meant the real world object(like a box, car etc.) not the Object class.
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T.RATHA KRISHNAN wrote: But it's 6 from start to end.
Which means the if(pWaypointNum1 < 6) condition will never evaluate to true. Have you stepped through the code to verify this?
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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What does mCharacter1->GoToWaypoint(pWaypointNum1) look like?
Does this use 'testl' to increment the screen position?
If so, where else does 'testl' get modified?
What happens when pWaypointNuml = 6 ?
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Why it's been voted down?
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How is that piece of code being run? Is it being run in a loop?
Regards,
--Perspx
"The Blue Screen of Death, also known as The Blue Screen of Doom, the "Blue Screen of Fun", "Phatul Exception: The WRECKening" and "Windows Vista", is a multi award-winning game first developed in 1995 by Microsoft" - Uncyclopedia
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I've used while loop instead of the top most if statement. The result is same. What to do?
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Your first line inside the while/if statement is:
if((pWaypointNum1 > 1) && (pWaypointNum1 <= 3))
Why not just set pWaypointNum1 to 1 before the while/if statement and then change that line to
if(pWaypointNum1 < 4)
as it seems to take integer values?
Regards,
--Perspx
"The Blue Screen of Death, also known as The Blue Screen of Doom, the "Blue Screen of Fun", "Phatul Exception: The WRECKening" and "Windows Vista", is a multi award-winning game first developed in 1995 by Microsoft" - Uncyclopedia
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Perspx wrote: Why not just set pWaypointNum1 to 1 before the while/if statement
in the original
when pWaypointNuml = 1 testl will be set to 3
your solution
when pWaypointNuml = 1 testl will be set to 6
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Oh right missed that 
Regards,
--Perspx
"The Blue Screen of Death, also known as The Blue Screen of Doom, the "Blue Screen of Fun", "Phatul Exception: The WRECKening" and "Windows Vista", is a multi award-winning game first developed in 1995 by Microsoft" - Uncyclopedia
Introduction to Object-Oriented JavaScript
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I hope to understand your problem right.
Let's suppose your "Object" is a square, if you want to move it from A to B as "animation" with different speeds... One way to do could be:
1) You calculate the differences in coordinates between A and B. Let's suppose an horizontal line where A is (0, 150) and B (500, 150). So for that example the distance is going to be 500 "pixels" or units of your screen coordinates.
2) You set your different speeds. Let's suppose 10 pixels / sec, 50 pixels / sec and 100 pixels / sec
3) Speed = distance / time == distance = speed * time == time = distance / speed Let's choose this last one, time depending on the other 2.
4) You make a function to increment in one pixel the coordinate of your square
void MoveSquare () { square.x = square.x + 1; }
for such a line you don't need a function, but if you want to do more things or move it in more directions you can ride better with it.
5) When you have to move the square you just need to calculate the time needed with the end_pos and the speed (500 / 10 = 50 sec; 500 / 50 = 10 secs; 500 / 100 = 5 sec)
6) You have to call the MoveSquare 500 times to move it till end_pos, then
1st case -> 50 sec / 500 calls = 0.1 sec / call
2nd case -> 10 sec / 500 calls = 0.05 sec / call
3rd case -> 5 sec / 500 calls = 0.01 sec / call
7) Create a timer with that refresh rates 100, 50, 10 ms and call MoveSquare into it
8) when end_pos is reached, kill the timer
Is something like that what you were searching?
Regards.
--------
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
“The First Rule of Program Optimization: Don't do it. The Second Rule of Program Optimization (for experts only!): Don't do it yet.” - Michael A. Jackson
Rating helpfull answers is nice, but saying thanks can be even nicer.
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Hi All,
I am developing an application to Windows Mobile Using VS 2005. And the OS is Windows XP.
I have developed a new dialpad with buttons. As a dialpad it works fine.
But for this I need to load an image. Using CBitmapButton i can load only BMP images. This image changes according to the Skin of the mobile.
When I googled I got the Answer as
SetBitmap API. But to my badluck that is not available for CButton.
Along with this, is it possible to write text on a loaded image?
So can someone help regarding this.
If it is Code then it will be more helpful.
Thanks in advance.
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