how convert string to xmlChar

Question

I'm trying to convert a string to an xmlChar. The compiler says no suitable conversion function from const string to xmlChar exists. This is what the code looks like:

bool ClassName::openFile(const String& ZipFile) { //convert const xmlChar *temp = (const xmlChar)ZipFile; //ZipFile has an error here. ZipFile is path and filename ... }

Any ideas? I googled it and people were converting from xmlChar to string but not this direction.

Possibly const xmlChar *temp = (const xmlChar*)(ZipFile.c_str()); — R Sahu
– R Sahu, Commented Nov 5, 2014 at 19:41
using C style cast with C++ is frowned upon as being poor coding style since it is a source of defects. I suspect you wanted to do something like const xmlChar *temp = (const xmlChar *)ZipFile.c_str();? see how to convert a std::string to const char or char — Richard Chambers
– Richard Chambers, Commented Nov 5, 2014 at 19:42
This is impossible to answer unless you provide the definitions of String and xmlChar, too. — antred
– antred, Commented Nov 5, 2014 at 20:12
xmlChar is part of libxml2. Thanks to @Christophe for editing the tags. What R Sahu and Richard Chambers suggested was a great help. I'm all set. Thanks! string is std::string for us. — Michele
– Michele, Commented Nov 5, 2014 at 20:26
string temp1 = "hello"; const xmlChar *temp = (const xmlChar *)temp1.c_str(); — Michele
– Michele, Commented Nov 5, 2014 at 20:27

Darien Pardinas · Accepted Answer · 2014-11-05 20:40:27Z

3

xmlChar is just a typedef of unsigned char. Just make your sentence like this:

const xmlChar *temp = ZipFile.c_str();

answered Nov 5, 2014 at 20:40

Darien Pardinas

6,3161 gold badge50 silver badges53 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Rajesh Negi · Accepted Answer · 2018-03-15 08:54:27Z

unsafe but removed overhead.

xmlChar *temp = reinterpret_cast<xmlChar*>(ZipFile);

but you must be aware of usage of reinterpret_cast

Devin · Accepted Answer · 2021-07-23 20:36:43Z

This xml library was written for standard C. There are c style casting methods used at the time that took advantage of the BAD_CAST keyword in the library. Example:

rc = xmlTextWriterWriteElement(writer, BAD_CAST "Value1", BAD_CAST "DATA1"); if (rc < 0) { throw EXCEPTION("Error in xmlTextWriterWriteElement"); }

But with c++ if you want to avoid the c-style cast the best you can do is:

rc = xmlTextWriterWriteElement(writer, const_cast<xmlChar*>(reinterpret_cast<const xmlChar *>("Value1")), const_cast<xmlChar*>(reinterpret_cast<const xmlChar *>("DATA1")));

Note that the usual dangers of this casting aren't a problem due to the use case here. We can safely assume the underlying library isn't going to do anything nasty to us.

Collectives™ on Stack Overflow

how convert string to xmlChar

3 Answers 3

Comments

Comments

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Linked

Related