[Error] cannot convert 'std::string {aka std::basic_string<char>}' to 'const char*' for argument '1' to 'FILE* fopen(const char*, const char*)'

具体代码：

string defi="D:\\HappyGames\\CL\\1.0\\";
    string defis="\\passwords.tmp";
    defi=defi+s;
    defi=defi+defis;
    FILE*passin=fopen(defi,"r");

[Error] cannot convert 'std::string {aka std::basic_string<char>}' to 'const char*' for argument '1' to 'FILE* fopen(const char*, const char*)'

说，因为变量‘1’不能将函数fopen的入参类型由string转化为char*类型，应该是路径里面的1.0吧.

FILE*passin=fopen(defi.c_str(),"r");