Re: Work with Arrays

From:

"Martin T." <0xCDCDCDCD@gmx.at>

Newsgroups:

comp.lang.c++

Date:

Wed, 30 Apr 2008 16:01:41 +0200

Message-ID:

<fv9u47$1hn$1@registered.motzarella.org>

Frank Liebelt wrote:

Hi

I hope my english ist good enough to explain what my problem is.

I want to create a array with two dimensions. Each index should have a
second dimension with three indexes.
Like: myarr[0][0-2] , myarr[1][0-2] and so on...

The size of the first dimension is unknown the second ist allways three.

In Detail:

I read an XML File and save all Values in an char* Array:

If you want to work with strings use the std::string class

I tried to use a vector for this problem.
Within the headerfile i wrote: vector<char> arrSpec;

This defines a vector of characters.
What you want is probably:
vector<std::string> for a list of strings
or maybe vector< vector<std::string> > for a list of lists of strings

...
int listPos = -1;

// This resize works
arrSpec.resize(XMLCount)

while ( element ) {
char *id = NULL;
char *name = NULL;
char *path = NULL;

listPos++;

id = xmlGetAttribute(element, _id);
name = xmlGetAttribute(element, _name);
path = xmlGetAttribute(element, _path

assuming that xmlGetAttribute returns a char* you have to make sure who
is responsible for free'ing the memory!

arrSpec[listPos].resize(3);

This fails because your original specification defines the lement
arrSpec[listPos] as a char, and that has no resize method.

arrSpec[listPos][0].push_back(id);
arrSpec[listPos][1].push_back(name);
arrSpec[listPos][2].push_back(path);
...

Maybe better:
if(id) {
arrSpec[listPos][0].push_back(id);
}

Hope this helps, br,
Martin