warning: ISO C++ forbids converting a string constant to 'char*'

char * fileName="./2017-09-02-10-34-10.xml";//这一种字符串赋值方式已经被ISO禁止了

    char str[] ="./2017-09-02-10-34-10.xml";
    char *fileName=str;

char fileName[] ={"./2017-09-02-10-34-10.xml"};//有无大括号都可以

int main(int argc, char *argv[])
{
    char str[] = "";    //先把C++中的string常量复制给C语言形式的字符串变量，再将str赋值给char*形式的C语言字符串。
    argv[2] = str;
}