After surfing the google & MSDN for a few days I found an MSDN site
that explained how to "new" a multidimensiona l array in C++...but, I
don't know how to use it, for alas, my brain still doesn't understand
pointer very well. Here's the site: http://msdn.microsoft.com/library/de...w_operator.asp
And here's what I've come up with thus far to have a 2 dimensional
array of CStrings.
CString (*myTwoDimArray )[3000][MAX_PARAMS];
myTwoDimArray = new CString[0][3000][MAX_PARAMS];
(p.s. if you need to know what that first [] is on the new statement,
see the above referenced website...even though it barely explains it).
SO! Anyone wanna' tell me how to actually put a value in my 2D
CString array? Or how to delete it once I'm done?! 6 3357
TrustyTif wrote: After surfing the google & MSDN for a few days I found an MSDN site that explained how to "new" a multidimensiona l array in C++...but, I don't know how to use it, for alas, my brain still doesn't understand pointer very well. Here's the site:
http://msdn.microsoft.com/library/de...w_operator.asp And here's what I've come up with thus far to have a 2 dimensional array of CStrings.
CString (*myTwoDimArray )[3000][MAX_PARAMS]; myTwoDimArray = new CString[0][3000][MAX_PARAMS];
(p.s. if you need to know what that first [] is on the new statement, see the above referenced website...even though it barely explains it).
SO! Anyone wanna' tell me how to actually put a value in my 2D CString array? Or how to delete it once I'm done?!
#include <vector>
std::vector<std ::vector<CStrin g> > your2darray(wid th,
std::vector<CSt ring>(height));
your2darray[x][y] = "asdf";
Memory management is done automatically.
- Pete
TrustyTif wrote: After surfing the google & MSDN for a few days I found an MSDN site that explained how to "new" a multidimensiona l array in C++...but, I don't know how to use it, for alas, my brain still doesn't understand pointer very well. Here's the site:
http://msdn.microsoft.com/library/de...w_operator.asp
And here's what I've come up with thus far to have a 2 dimensional array of CStrings.
CString (*myTwoDimArray )[3000][MAX_PARAMS]; myTwoDimArray = new CString[0][3000][MAX_PARAMS];
(p.s. if you need to know what that first [] is on the new statement, see the above referenced website...even though it barely explains it).
This doesn't make any sense. A multidimensiona l array with one or more a
zero-sized dimensions contains no elements. I don't see anything like
that on the linked web page.
If you really want to declare 'myTwoDimArray' as a _pointer_ to
two-dimensional array, you can allocate memory for it as follows
myTwoDimArray = new CString[1][3000][MAX_PARAMS];
// Note that 0 was replaced with 1
...
// Accessing elements
assert(3 < MAX_PARAMS);
(*myTwoDimArray )[10][3] = "test";
...
// Deallocating memory
delete[] myTwoDimArray;
But this is rather strange way to do this, to say the least.
You could also do this
myTwoDimArray =
(CString(*)[3000][MAX_PARAMS]) new CString[3000][MAX_PARAMS];
// Only two dimensions are really needed
...
// Accessing elements
assert(3 < MAX_PARAMS);
(*myTwoDimArray )[10][3] = "test";
...
// Deallocating memory
delete[] (CString(*)[MAX_PARAMS]) myTwoDimArray;
But this is also as ugly as it gets. And, strictly speaking, this code's
behavior is implementation defined since it relies on
'reinterpret_ca st's. (I'll probably burn in hell for writing this one.)
If you really want to stick with built-in arrays, the proper way to do
it is to declare 'myTwoDimArray' as a pointer to a single-dimensional array
CString (*myTwoDimArray )[MAX_PARAMS];
myTwoDimArray = new CString[3000][MAX_PARAMS];
...
// Accessing elements
assert(3 < MAX_PARAMS);
myTwoDimArray[10][3] = "test";
...
// Deallocating memory
delete[] myTwoDimArray;
Looks much cleaner, doesn't it?
And, finally, you can make the whole thing to look even more clean if
you use 'std::vector's instead of built-in arrays (see Petec's response).
SO! Anyone wanna' tell me how to actually put a value in my 2D CString array? Or how to delete it once I'm done?!
See above.
--
Best regards,
Andrey Tarasevich
"TrustyTif" <ti***********@ motorola.com> wrote in message
news:ab******** *************** ***@posting.goo gle.com... After surfing the google & MSDN for a few days I found an MSDN site that explained how to "new" a multidimensiona l array in C++...but, I don't know how to use it, for alas, my brain still doesn't understand pointer very well. Here's the site:
http://msdn.microsoft.com/library/de...w_operator.asp And here's what I've come up with thus far to have a 2 dimensional array of CStrings.
CString (*myTwoDimArray )[3000][MAX_PARAMS]; myTwoDimArray = new CString[0][3000][MAX_PARAMS];
(p.s. if you need to know what that first [] is on the new statement, see the above referenced website...even though it barely explains it).
SO! Anyone wanna' tell me how to actually put a value in my 2D CString array? Or how to delete it once I'm done?!
Actually you have a three dimensional array, count the pairs of square
brackets in the new statement.
You aren't going to be able to allocate a 2D array without understanding
pointers well. So I suggest you get a book and C or C++ and start reading.
On the other hand if you just want some code
CString (*myTwoDimArray )[MAX_PARAMS];
myTwoDimArray = new CString[3000][MAX_PARAMS];
myTwoDimArray[1][1] = "abc";
delete[] myTwoDimArray;
john
Andrey Tarasevich <an************ **@hotmail.com> wrote in message news:<10******* ******@news.sup ernews.com>... TrustyTif wrote: After surfing the google & MSDN for a few days I found an MSDN site that explained how to "new" a multidimensiona l array in C++...but, I don't know how to use it, for alas, my brain still doesn't understand pointer very well. Here's the site:
http://msdn.microsoft.com/library/de...w_operator.asp
And here's what I've come up with thus far to have a 2 dimensional array of CStrings.
CString (*myTwoDimArray )[3000][MAX_PARAMS]; myTwoDimArray = new CString[0][3000][MAX_PARAMS];
(p.s. if you need to know what that first [] is on the new statement, see the above referenced website...even though it barely explains it).
This doesn't make any sense. A multidimensiona l array with one or more a zero-sized dimensions contains no elements. I don't see anything like that on the linked web page.
If you really want to declare 'myTwoDimArray' as a _pointer_ to two-dimensional array, you can allocate memory for it as follows
myTwoDimArray = new CString[1][3000][MAX_PARAMS]; // Note that 0 was replaced with 1 ... // Accessing elements assert(3 < MAX_PARAMS); (*myTwoDimArray )[10][3] = "test"; ... // Deallocating memory delete[] myTwoDimArray;
But this is rather strange way to do this, to say the least.
You could also do this
myTwoDimArray = (CString(*)[3000][MAX_PARAMS]) new CString[3000][MAX_PARAMS]; // Only two dimensions are really needed ... // Accessing elements assert(3 < MAX_PARAMS); (*myTwoDimArray )[10][3] = "test"; ... // Deallocating memory delete[] (CString(*)[MAX_PARAMS]) myTwoDimArray;
But this is also as ugly as it gets. And, strictly speaking, this code's behavior is implementation defined since it relies on 'reinterpret_ca st's. (I'll probably burn in hell for writing this one.)
If you really want to stick with built-in arrays, the proper way to do it is to declare 'myTwoDimArray' as a pointer to a single-dimensional array
CString (*myTwoDimArray )[MAX_PARAMS]; myTwoDimArray = new CString[3000][MAX_PARAMS]; ... // Accessing elements assert(3 < MAX_PARAMS); myTwoDimArray[10][3] = "test"; ... // Deallocating memory delete[] myTwoDimArray;
Looks much cleaner, doesn't it?
And, finally, you can make the whole thing to look even more clean if you use 'std::vector's instead of built-in arrays (see Petec's response).
SO! Anyone wanna' tell me how to actually put a value in my 2D CString array? Or how to delete it once I'm done?!
See above.
Thanks Andrey! Both of your suggestions worked wonders!
TrustyTif posted: After surfing the google & MSDN for a few days I found an MSDN site that explained how to "new" a multidimensiona l array in C++...but, I don't know how to use it, for alas, my brain still doesn't understand pointer very well. Here's the site:
http://msdn.microsoft.com/library/de.../en-us/vclang9 8/html/_pluslang_new_o perator.asp
And here's what I've come up with thus far to have a 2 dimensional array of CStrings.
CString (*myTwoDimArray )[3000][MAX_PARAMS]; myTwoDimArray = new CString[0][3000][MAX_PARAMS];
(p.s. if you need to know what that first [] is on the new statement, see the above referenced website...even though it barely explains it).
SO! Anyone wanna' tell me how to actually put a value in my 2D CString array? Or how to delete it once I'm done?!
Would any sort of variation of the following work?:
(int[x][y]) *p2DArray;
p2DArray = new int[x][y];
p2DArray[3][3] = 4;
Just a thought!
-JKop
"John Harrison" <jo************ *@hotmail.com> wrote in message news:<2i******* *****@uni-berlin.de>... "TrustyTif" <ti***********@ motorola.com> wrote in message news:ab******** *************** ***@posting.goo gle.com... After surfing the google & MSDN for a few days I found an MSDN site that explained how to "new" a multidimensiona l array in C++...but, I don't know how to use it, for alas, my brain still doesn't understand pointer very well. Here's the site:
http://msdn.microsoft.com/library/de...w_operator.asp And here's what I've come up with thus far to have a 2 dimensional array of CStrings.
CString (*myTwoDimArray )[3000][MAX_PARAMS]; myTwoDimArray = new CString[0][3000][MAX_PARAMS];
(p.s. if you need to know what that first [] is on the new statement, see the above referenced website...even though it barely explains it).
SO! Anyone wanna' tell me how to actually put a value in my 2D CString array? Or how to delete it once I'm done?!
Actually you have a three dimensional array, count the pairs of square brackets in the new statement.
You aren't going to be able to allocate a 2D array without understanding pointers well. So I suggest you get a book and C or C++ and start reading.
On the other hand if you just want some code
CString (*myTwoDimArray )[MAX_PARAMS]; myTwoDimArray = new CString[3000][MAX_PARAMS];
myTwoDimArray[1][1] = "abc";
delete[] myTwoDimArray;
john
A good idea to create a 2d array would be to do as follows:
CString **myTwoDimArray ;
myTwoDimArray = new CString*[3000]; //an array of pointers.
for(int i=0;i<3000;i++) {
myTwoDimArray[i] = new CString[MAX_PARAMS]; //init each pointer.
}
To use elements in this array:
myTwoDimArray[0][0] = "Str1";
and so on..
To cleanly de-allocate:
for(int i=0;i<3000;i++) {
delete []myTwoDimArray[i];
}
delete []myTwoDimArray;
Hope this helps.
-BG This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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