Help with c++ and cmd.exe

[Cody Long]

I am attempting to write a shell of sorts for cmd.exe. What I want to do is have the user type in a command and then it be passed into the command line. I know this is possible because freecommander has a way to do this but I need to know how. Any help will be appreciated.

[Joachim Rohde]

Use the /C option, e.g.
cmd /c dir
executes the "dir" command. For more options type "help cmd" into your shell.

[Cody Long]

i am still somewhat of a newb with c++ so how exactly would i do this? i tried this

  #include <iostream>
using namespace std;

int main (){
    cmd /c dir;
    system("pause");
}
  

and got this error

  Compiler: Default compiler
Executing  g++.exe...
g++.exe "E:\Dev-Cpp\cmd\cmd.cpp" -o "E:\Dev-Cpp\cmd\cmd.exe"    -I"E:\Dev-Cpp\lib\gcc\mingw32\3.4.2\include"  -I"E:\Dev-Cpp\include\c++\3.4.2\backward"  -I"E:\Dev-Cpp\include\c++\3.4.2\mingw32"  -I"E:\Dev-Cpp\include\c++\3.4.2"  -I"E:\Dev-Cpp\include"   -L"E:\Dev-Cpp\lib" 
E:\Dev-Cpp\cmd\cmd.cpp: In function `int main()':
E:\Dev-Cpp\cmd\cmd.cpp:5: error: expected primary-expression before '/' token
E:\Dev-Cpp\cmd\cmd.cpp:5: error: `c' undeclared (first use this function)
E:\Dev-Cpp\cmd\cmd.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
E:\Dev-Cpp\cmd\cmd.cpp:5: error: expected `;' before "dir"

Execution terminated
  

[Joachim Rohde]

I don't know if we are talking about the same thing here. I understood that you want to pass a command to cmd.exe which gets executed.
Anyway, if you want to execute an external program from within your C code have a look at http://www.cplusplus.com/reference/clibrary/cstdlib/system/

[Cody Long]

thank you soooooo much! that helped out alot! now i just need to figure out how to pass a string to do the same thing.
i used this code:

  #include <iostream>
using namespace std;

string dir;
int pause();

int main (){
    cout << "enter \"dir\"\n";
    cin >> dir;
    int i;
    printf ("Checking if processor is available...");
    if (system(NULL)) puts ("Ok");
       else exit (1);
    printf ("Executing command DIR...\n");
    i=system (dir);
    printf ("The value returned was: %d.\n",i);
    pause();
}

int pause() {
        system("pause");
}
  

and got this error:

Compiler: Default compiler
Executing  g++.exe...
g++.exe "L:\Dev-Cpp\projectas\cmd\cmd.cpp" -o "L:\Dev-Cpp\projectas\cmd\cmd.exe"    -I"L:\Dev-Cpp\lib\gcc\mingw32\3.4.2\include"  -I"L:\Dev-Cpp\include\c++\3.4.2\backward"  -I"L:\Dev-Cpp\include\c++\3.4.2\mingw32"  -I"L:\Dev-Cpp\include\c++\3.4.2"  -I"L:\Dev-Cpp\include"   -L"L:\Dev-Cpp\lib" 
L:\Dev-Cpp\projectas\cmd\cmd.cpp: In function `int main()':
L:\Dev-Cpp\projectas\cmd\cmd.cpp:15: error: cannot convert `std::string' to `const char*' for argument `1' to `int system(const char*)'

Execution terminated

  

can you please explain to me why this is happening? also whenever i use:

  
string strng;
cin >> strng;
cout << strng;  

and put multiple words in the string it only prints out the first word.
any help on this issue?