[완료] c/c++ 외부라이브러리는 어떻게 사용해야하나요? (Qt)

#include <iostream>
 
#define CRYPTOPP_DEFAULT_NO_DLL
#include <cryptopp/dll.h>
#ifdef CRYPTOPP_WIN32_AVAILABLE
#include <windows.h>
#endif
#include <cryptopp/md5.h>
 
USING_NAMESPACE(CryptoPP)
USING_NAMESPACE(std)
const int MAX_PHRASE_LENGTH=250;
 
int main(int argc, char *argv[]) {
 
CryptoPP::MD5 hash;
byte digest[ CryptoPP::MD5::DIGESTSIZE ];
std::string message = "Hello World!";
 
hash.CalculateDigest( digest, (const byte*)message.c_str(), message.length());
 
CryptoPP::HexEncoder encoder;
std::string output;
encoder.Attach( new CryptoPP::StringSink( output ) );
encoder.Put( digest, sizeof(digest) );
encoder.MessageEnd();
 
std::cout << "Input string: " << message << std::endl;
std::cout << "MD5: " << output << std::endl;
 
return 0;
}

#include <iostream>
 
#define CRYPTOPP_DEFAULT_NO_DLL
#include <cryptopp/dll.h>
#include <cryptopp/default.h>
#ifdef CRYPTOPP_WIN32_AVAILABLE
#include <windows.h>
#endif
 
USING_NAMESPACE(CryptoPP)
USING_NAMESPACE(std)
 
const int MAX_PHRASE_LENGTH=250;
 
void EncryptFile(const char *in,
                    const char *out,
                    const char *passPhrase);
void DecryptFile(const char *in,
                    const char *out,
                    const char *passPhrase);
 
 
int main(int argc, char *argv[])
{
   try
    {
       char passPhrase[MAX_PHRASE_LENGTH];
       cout << "Passphrase: ";
       cin.getline(passPhrase, MAX_PHRASE_LENGTH);
       EncryptFile(argv[1], argv[2], passPhrase);
       DecryptFile(argv[2], argv[3], passPhrase);
    }
    catch(CryptoPP::Exception &e)
    {
       cout << "\nCryptoPP::Exception caught: "
              << e.what() << endl;
       return -1;
    }
    catch(std::exception &e)
    {
       cout << "\nstd::exception caught: " << e.what() << endl;
       return -2;
    }
 }
 
 
void EncryptFile(const char *in,
                    const char *out,
                    const char *passPhrase)
 {
    FileSource f(in, true, new DefaultEncryptorWithMAC(passPhrase,
                   new FileSink(out)));
 }
 
void DecryptFile(const char *in,
                    const char *out,
                    const char *passPhrase)
 {
    FileSource f(in, true,
         new DefaultDecryptorWithMAC(passPhrase, new FileSink(out)));
 }
 
RandomPool & GlobalRNG()
 {
    static RandomPool randomPool;
    return randomPool;
 }
int (*AdhocTest)(int argc, char *argv[]) = NULL;