cannot convert std basic string char 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   string name    john   system   quickscan exe resolution 300 selectscanner jpg showui showprogress filename    name   jpg

User · Accepted Answer

The type of expression    quickscan exe resolution 300 selectscanner jpg showui showprogress filename    name   jpg     is std  string  However function system has declaration  int system const char  s     that is it accepts an argumnet of type const char    There is no conversion operator that would convert implicitly an object of type std  string to object of type const char     Nevertheless class std  string has two functions that do this conversion explicitly  They are c str   and data    the last can be used only with compiler that supports C  11   So you can write  string name    john    system     quickscan exe resolution 300 selectscanner jpg showui showprogress filename    name   jpg    c str        There is no need to use an intermediate variable for the expression

User · Answer

The system function requires const char    and your expression is of the type std  string  You should write  string name    john   string system str     quickscan exe resolution 300 selectscanner jpg showui showprogress filename    name   jpg    system system str c str

User · Answer

The addition of a string literal with an std  string yields another std  string  system expects a const char   You can use std  string  c str   for that   string name    john   string tmp     quickscan exe resolution 300 selectscanner jpg showui showprogress filename    name   jpg   system tmp c str

User · Answer

try using concatenation of string  Statistics string date                this- gt date    date          acually this was a part of a class

User · Answer

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         See std  string operator  const char

User · Answer

As all the other answers show  the problem is that adding a std  string and a const char  using   results in a std  string  while system   expects a const char   And the solution is to use c str    However  you can also do it without a temporary   string name    john   system    quickscan exe resolution 300 selectscanner jpg showui showprogress filename    name   jpg    c str

[c++] cannot convert 'std::basic_string<char>' to 'const char' for argument '1' to 'int system(const char)'

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[c++] cannot convert 'std::basic_string<char>' to 'const char*' for argument '1' to 'int system(const char*)'

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[c++] cannot convert 'std::basic_string<char>' to 'const char' for argument '1' to 'int system(const char)'