Problem with bash(system->wget) command in c++

here is my code:

string line;
ifstream toOpen;
toOpen.open("allfiles.txt", ios::in);
int fileCounter=0;

if(toOpen.is_open()){
    while(!toOpen.eof()){
        getline(toOpen,line);
        string dl = "wget -q -E -O  superman/" + href[0] + " " + line;
        //cout << dl << endl;
        fileCounter++;
        system(dl);
    }

    toOpen.close();
}

Where the allfiles.txt (the content):

http://www.xxx.com/index1.html
http://www.xxx.com/index2.html

Where 开发者_JAVA技巧href[] values are like: {index1.html, index2.html, index3.html ...}

My error message:

file.cpp:XX: error: cannot convert ‘std::string’ to ‘const char*’ for argument ‘1’ to ‘int system(const char*)’

---

The function 'system' takes a 'const char *' as argument but you gave it an std::string. Try

system(dl.c_str());

---

system wants a const char * argument, so you have to call dl.c_str() to get a char * to the std::string's data.

    system(dl.c_str());

---

system() know nothing about C++ types. You have to give it char* like this:

system(dl.c_str());