strings/char problem :(

[Inner Dragon]

Hey guys, I've been having a real hard time trying to pass a string as
parameter and then converting it to char to be used with
SDLNet_TCP_Recv. It's been hell with me though, here's my non-working
code... any help is greatly appreciated!

------------------------------------------------------------------------------------------------

void Login(std::string &pass){
cout << pass << endl;
char * loginstr;
/*
What I want to archieve is to be able to use:

sprintf(loginstr,"user\npass");

And then send it to the respective function, Send():

void Send(char *msg){
SDLNet_TCP_Send(sock,msg,strlen(msg));
}

as: Send(loginstr);
*/

}

int main(int argc, const char* argv[]) {
std::string pass;
cout << "Password: ";
cin >> pass;
Login(pass);
return(0);
}

----------------------------------------------------------------------------------------

 

[BobR]

Hey guys, I've been having a real hard time trying to pass a string as
parameter and then converting it to char to be used with
SDLNet_TCP_Recv. It's been hell with me though, here's my non-working
code... any help is greatly appreciated!
----------

void Login(std::string &pass){
cout << pass << endl;
char * loginstr;
/*
What I want to archieve is to be able to use:

sprintf(loginstr,"user\npass");

std::string mystring("user\npass");
mystring.push_back('\0'); // insurance!
char *loginstr( &mystring.at(0) );
std::cout<<"loginstr="<<loginstr<<std::endl;

And then send it to the respective function, Send():

void Send(char *msg){
SDLNet_TCP_Send(sock,msg,strlen(msg));
}
as: Send(loginstr);
*/

Change 'Send()' to:

void Send( char const *msg ){}

Then:
Send( myString.c_str() );

}

int main(int argc, const char* argv[]) {
std::string pass;
cout << "Password: ";
cin >> pass;
Login(pass);
return(0);
}
----------

 

[Gianni Mariani]

Hey guys, I've been having a real hard time trying to pass a string as
parameter and then converting it to char to be used with
SDLNet_TCP_Recv. It's been hell with me though, here's my non-working
code... any help is greatly appreciated!

------------------------------------------------------------------------------------------------

void Login(std::string &pass){
cout << pass << endl;
char * loginstr;
/*
What I want to archieve is to be able to use:

sprintf(loginstr,"user\npass");

NEVER use sprintf on user based input... In fact, never use sprintf
-period-.

And then send it to the respective function, Send():

void Send(char *msg){
SDLNet_TCP_Send(sock,msg,strlen(msg));
}

as: Send(loginstr);
*/

}

int main(int argc, const char* argv[]) {
std::string pass;
cout << "Password: ";
cin >> pass;
Login(pass);
return(0);
}

void Login(const std::string &pass) // << note the const
{
cout << pass << endl;

std::string msg = std::string(user) + '\n' + pass;

SDLNet_TCP_Send( sock, msg.data(), msg.length());
}

int main(int argc, const char* argv[]) {
std::string pass;
cout << "Password: ";
cin >> pass;
Login(pass);
return(0);
}