help with XML tags?

advanced
#1

Hi all,

I’m trying to use my OF program to write to an XML file that another (non OF) program reads from.

Because that program expects the XML in it’s own format, I can’t change the tag structure.

I’m trying to change the image file in the following tags:

  
<XmlExchange>  
    <label name="MediaReadin" type="1">  
        <a string="image_0077.bmp" />  
    </label>  
</XmlExchange>

Can I get at the string data using any of the ofxXmlSettings calls?

Calling XML.tagExists(“XmlExchange:label:a”); on the file returns true, but I can’t get XML.getValue(“XmlExchange:label:a”, “bah”); to return anything, despite trying a variety of permutations.

I’m not sure what to do about the “name=”, “type=”, “string=” parts of the tags.

Maybe I just have to read/write to the xml file like a text file? But I’m hoping to avoid that.

Thanks for any suggestions. -Camille

#2

those are attirbutes and since 0061 you can read them too:

XML.getAttribute(“XmlExchange:label:a”, “string”, “bah”);

#3

Oh! Thanks Arturo.

I’m still using 0060, so will switch over now.

Many Thanks again for helping. -C

#4

Uh oh. After downloading 061 I’m still having problems:

Here is the XML again:

  
<XmlExchange>  
    <label name="MediaReadin" type="1">  
        <a string="image_0077.bmp" />  
    </label>  
</XmlExchange>

If I do the following, fexists returns true, so I think I have the tag syntax right:

  
bool fexists=0;  
fexists = XML.tagExists("XmlExchange:label:a");  
if(fexists)printf("found tag \n");

but, if I do this, the value of my xmlstring var is NULL?

  
string xmlstring;  
xmlstring=XML.getAttribute("XmlExchange:label:a", "string", "bah");  
printf("value is %s\n",xmlstring);

I’ve tried replacing the “string” with “string=”, and looking at the attributes of the outer tag: XML.getAttribute(“XMLExchange:label”, “name”, “bah”) but still to no avail?

I even tried to print directly in case there was something going on with my string variable:

printf(“value is %s\n”, XML.getAttribute(“XmlExchange:label:a”, “string”, “bah”));

Am I missing something? Many thanks. -C

#5

Replying to myself - YES!

  
printf("value is %s\n", xmlstring.c_str( ));

feeling sheepish. It’s been awhile since I’ve coded.

Is there a good OF example of string handling anywhere?

best -C

#6

I get all kinds of things wrong with C++ strings b/c they’re so different than java/ruby/actionscript strings. There’s a good reference here.

www.cplusplus.com/reference/string/
or
http://www.learncpp.com/cpp-tutorial/17-…-tdwstring/

You really don’t need to use c strings very often. printf() is the only time I ever do, but for the most part you can use c++ strings the same as strings in other (friendlier-ish) languages.