Using variables wiht system()

This is a discussion on Using variables wiht system() within the C++ Programming forums, part of the General Programming Boards category; Hello, I was just wondering how i would use a variable with the system() function i get this error every ...

  1. #1
    Registered User Bender's Avatar
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    Using variables with system()

    Hello,
    I was just wondering how i would use a variable with the system() function i get this error every time i try:
    error C2664: 'system' : cannot convert parameter 1 from 'class String' to 'const char *'
    No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called

    Thanks for your help Bender
    Last edited by Bender; 07-31-2004 at 06:53 PM.

  2. #2
    Crazy Fool Perspective's Avatar
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    you are tring to pass system a String, you need to use a const char*
    does your String class have a function to return the string as a const char*? the stl string class has a function called c_str() which will do this.

  3. #3
    Registered User Bender's Avatar
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    Thanks for the response im preety sure my string library has a c_str() conversion function i found this in the my string library
    Code:
    const char * c_str( )             const;    // explicit conversion to char *
    but i dont understand the syntax for it would it be somthing like
    Code:
    String Destination="c:\\windows";
    Destination.c_str();
    system(Destination);
    Last edited by Bender; 07-31-2004 at 06:44 PM.

  4. #4
    Crazy Fool Perspective's Avatar
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    your close, but the c_str() function returns a c-string, that c-string is what you want to pass to system() so...
    Code:
    system(Destination.c_str());

  5. #5
    Registered User Bender's Avatar
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    ahh thanks a lot

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