Read directly from CString
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hi all,
i'm working on an little project using tinyxml. an i've got a question during working on this.
how can i read directly from a cstring??
in the last release i only can read from xml files....
Hi Christian,
Do you mean a C-style string (ie const char*) or a CString as in the MFC class, or something else?
From memory (I don't have the source here in front of me) there is a document.parse() method that takes a const char*.
HTH
Ellers
Hi,
i mean a mfc style cstring.
You should do something like this :
CString S;
S = "<item />"; // or any other xml string
TiXmlDocument d;
d . Parse ((LPCTSTR) S);
i use this
TiXmlDocument doc ;
CString xml;
doc.Parse((const char*)(LPCTSTR)xml);
but there no value in the parser, the first child is null....
where's my bug??
OK I'm not being smart, I just want to cover the obvious base: did you mean EXACTLY that code you posted?
You didn't initialise the string?
Assuming you meant that you did something like
xml="<item/>"
as Yves posted, then are you checking the result of the parse?
eg (borrowed from the test program)
if ( doc.Error() )
{
printf( "Error in %s: %s\n", doc.Value(), doc.ErrorDesc() );
exit( 1 );
}
TiXmlElement* firstElement = doc.RootElement()->FirstChildElement();
i've got the bug....
i use the above code in a windows ce project and windows ce use unicode...
I used to use TinyXML for the PocketPC 2002 and didn't have a problem. I just had to perform a little basic conversion on data I got back from TinyXML.
...in a ppc application a const char* is a multibyte character (a character consists of two bytes). the first byte is the character himself and the second byte is 0.
when i convert my cstring to const char* the parse function reads the first byte as the first character(for example a tag open '<'). after this the function reads the second byte as the second character, but the character is 0 because it's not the second character, it's the second byte of the character. that throws a null pointer exception. ignore the 0.
the solution is not the best way and it's a little bit slowly but i can get the data out of my web service and that's what i want.
TiXmlDocument *doc = new TiXmlDocument();
char* buf;
CString sXml = TEXT("<?xml version="1.0" encoding="iso-8859-1"?>")
buf = (char*)malloc(sXml.GetLength());
memset(buf, 0, sizeof(buf));
for (int i=0; i< sXml.GetLength(); i++) buf[i] = sXml[i];//to parse only the character
doc->Parse((char*)buf);
if there's anybody who got a better way...please post it or send me an email....
Like B Sizer said, what about writing some simple conversion routines?
Stuff like
CString widexml = ...
MySingleByteString xml( widexml )
...
doc->Parse( xml.c_str( ))
this stuff has been done 100s of times, code *must* be out there on in the ppc SDK somewhere.
Alternatively do a unicode build of tinyxml, modifying/patching if required? It could be as simple as changing TinyXml something like
#if unicode
typedef wchar TXML_CHAR
#else
typedef char TXML_CHAR
#endif
then all the char routines will probably work just fine, even with pChar++ etc.
**TiXmlDocument doc ;
CStringA xml(<head><body/></head>);
doc.Parse(xml.GetBuffer()l);
try this one for CString usage to parse an xml string…….
**
sorry little changes in previous one…..
**TiXmlDocument doc ;
CStringA xml("<head><body/></head>");
doc.Parse(xml.GetBuffer()); **