Thread: How to Use Libraries in my cpp file?

Originally Posted by stahta01

This code worked for me.

Code:

#include <string>
#include <boost\algorithm\string\replace.hpp>

using std::string;
using boost::algorithm::replace_first;

int main ()
{
   string str1 = "Hello Dolly, Hello World!";
   replace_first(str1, "Dolly", "Jane");
   return 0;
}

Note: As always I am a C programmer learning C++; so, I could easily be doing something wrong.

Note: I have been told many times that using "using namespace" is a bad thing that textbooks and beginners do; and, to stop doing that.


Tim S.

FINALLY IT WORKS!! THANKS TIM!!!

Ha, okay, ceteris paribus, and after making a few changes the code worked. I also included cout using std::cout and not through the using std namespace. It was a pleasure falling victim to using std namespace as the trap was experienced through practice and not through reading theory and forum rants.

I dont know why it works, but it works. Two things though:
1) Does this mean that everytime I use third party libraries I cant use using std namespace?
2) how different would this process be if I had to use compiled libraries? i.e. with this Boost algorithm, one only need use linking to header files and not obj. files

Apologies for digging out old skeletons here, but a similar problem has arisen:

I have downloaded SQLite3 which contains sqlite3.def and sqlite.dll for the latest library version.

How do I link a dll to my main programme?

Tried everything, including the closest I could get:

Code:

#include <stdio.h>
#include <sqlite3.h>

int main(int argc, char* argv[])
{
   sqlite3 *db;
   char *zErrMsg = 0;
   int rc;

   rc = sqlite3_open("test.db", &db);

   if( rc ){
      fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
      exit(0);
   }else{
      fprintf(stderr, "Opened database successfully\n");
   }
   sqlite3_close(db);
}

I did the same thing as before; I set the search directories of the compiler and linker to the location of the dll and def file.

Originally Posted by laserlight

For SQLite, it is easiest to use the amalgamation, i.e., just add the huge source file (the amalgamation of all the original source files of SQLite) to your project, or otherwise compile and link it, and include the header where you need to.

I did this to the above code and got the error: "sqlite3.h: No such file or directory"

It cant find:

sqlite.dll

even though I set the search directory of the compiler and linker to it, namely:

C:\ThisProject\bin\Debug

(note how the dll is also in the same directory as the exe just in case

Originally Posted by laserlight

That just means that you need to add sqlite3.h to say, the same directory as your other header files.

Im a bit confused. I only have one source file, namely my main file posted above. I dont have other header files? Im not an expert at this linking stuff so I might need lamens terms