My own sprintf(...)

[Simon]

Hi,

I have default const strings that we use as templates to send emails, (and
multi language messages).
We also want to allow the users to format their own messages.

We have specific messages like devices name and certain settings.

I can use sprintf(...) to replace numbers or strings, but how can I replace
my own variables?

for example

const char * szMsg = "#device# was turned on at #time#";

std::string MyFormat( const char * s )
{
std::string szRet = "";
// replace all the #device# with "device number x"
// replace #time# with "12:02:36pm"
// ...and so on...

return szRet;
}

Does the standard have a way of doing search and replace?

Many thanks

Simon

 

[Ivan Vecerina]

for example

const char * szMsg = "#device# was turned on at #time#";

std::string MyFormat( const char * s )
{
std::string szRet = "";
// replace all the #device# with "device number x"
// replace #time# with "12:02:36pm"
// ...and so on...

return szRet;
}

First of all, you may want to take a look at the
boost::format library - it might suit your needs
(although with a different syntax/approach):
http://www.boost.org/libs/format/doc/format.html

Does the standard have a way of doing search and replace?

Almost - it does help to use some wrapper functions.
My personal toolbox includes:

bool replaceFirst(std::string& ioStr, std::string const& findStr,
std::string const& replStr)
{
std::string::size_type const pos = ioStr.find(findStr);
if( std::string::npos == pos )
return false;

ioStr.replace( pos, findStr.size(), replStr );
return true;
}

int replaceAll(std::string& ioStr, std::string const& findStr, std::string
const& replStr)
{
int hits = 0;
for( std::string::size_type pos = 0
; std::string::npos != ( pos = ioStr.find( findStr, pos ) )
; pos += findStr.size()
)
{
ioStr.replace( pos, findStr.size(), replStr );
++hits;
}
return hits;
}


I hope this helps,
Ivan