Trouble With Retrieving A std::string From boost::program_ options

[Starfox]

The Following Code:

//Setup the options
string InputName, OutputSkeletonN ame, OutputModelName ;
program_options ::options_descr iption OptionDesc("Ava ilable Options");
OptionDesc.add_ options()
("help", "produce help message")
("input,I", program_options ::value<string> (&InputName), "Input
md5mesh File")
("out-skl,S", program_options ::value<string> (&OutputSkeleto nName),
"Output Skeleton File")
("out-mdl,M", program_options ::value<string> (&OutputModelNa me),
"Output Model File");
program_options ::variables_map OptionMap;
program_options ::store(program _options::parse _command_line(a rgc, argv,
OptionDesc), OptionMap);
if(OptionMap.co unt("help"))
{
cout << OptionDesc;
return -2;
}
string t = OptionMap["I"].as<const char*>(); //CRASH

Crashes at the last line, even if i replace the const char* with
std::string. I'm using VC++ 2005 on Windows XP SP2 and BOOST 1.32.0 .
Any ideas?

[Mathias Waack]

Starfox wrote:

The Following Code:

//Setup the options
string InputName, OutputSkeletonN ame, OutputModelName ;
program_options ::options_descr iption OptionDesc("Ava ilable Options");
OptionDesc.add_ options()
("help", "produce help message")
("input,I", program_options ::value<string> (&InputName), "Input
Ok, the Input-Parameter following after "-I" should be taken as an string.
md5mesh File")
("out-skl,S", program_options ::value<string> (&OutputSkeleto nName),
"Output Skeleton File")
("out-mdl,M", program_options ::value<string> (&OutputModelNa me),
"Output Model File");
program_options ::variables_map OptionMap;
program_options ::store(program _options::parse _command_line(a rgc, argv,
OptionDesc), OptionMap);
if(OptionMap.co unt("help"))
{
cout << OptionDesc;
return -2;
}
string t = OptionMap["I"].as<const char*>(); //CRASH
What do you want to do? You've advised boost to take the parameter for "-I"
as a string, after that you asked the program to read it as an "const
char*" and at least you assign the result to a string.
Crashes at the last line, even if i replace the const char* with
std::string. I'm using VC++ 2005 on Windows XP SP2 and BOOST 1.32.0 .
Any ideas?

Depends on what do you want to do. Ever tried the mucher shorter form:

string t = InputName;

(even if it doesn't make sense for me...)

Mathias

[Starfox]

I tried t = InputName, but InputName is completely empty!! it never
gets touched. and like i said, if i change the char* to a string it
still doesn't work. any ideas?