cannot convert 'std::basic_string' to 'const char*' for argument '1' to 'int system(const char*)'

Question

I get this error: \"invalid operands of types \'const char*\' and \'const char [6]\' to binary \'operator+\'\" when i try to compile my script. Here should be the error:

Answer 1

std::string + const char* results in another std::string. system does not take a std::string, and you cannot concatenate char*'s with the + operator. If you want to use the code this way you will need:

std::string name = "john";
std::string tmp = 
    "quickscan.exe resolution 300 selectscanner jpg showui showprogress filename '" + 
    name + ".jpg'";
system(tmp.c_str());

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See std::string operator+(const char*)