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string a = "Hello";
string b = " World!";

string sentence = a + b;

dbText(10,10,sentence.c_str());

char* sentence_incharformat = (const char*)sentence.c_str();

char tmpString[256];
sprintf(tmpString,"Hello world %d",VarX);
dbText(0,0,tmpString);

#include <string>
#include <stringstream>
using std::string;

// toStr
// convert a value to a string
template <class T> string toStr( T &value )
{
	std::ostringstream ss;
	ss << value;
	return ss.str();
}

// fromStr
// convert a value from a string
template <class T> T fromStr( string &str )
{
	T value;
	std::istringstream ss( str );
	ss >> value;
	return value;
}

// castStr
// casts a std::string to a char ptr, use this to pass strings into gdk commands when it expects a char *
char *castStr( const string &str )
{
	return const_cast<char *>( str.c_str() );
}

dbText( 0, 0, castStr( "Hello World! " + toStr( someNumber ) ) );
and
float myNumber = fromStr<float>( "3220.0" );