Thread: Nothing wrong!!! And yet I get this error:

Code:

#include <cstdlib>
#include <iostream>
#include <conio.h>
 
using namespace std;
 
int main( void )
{
ofstream out_file;
out_file.open("test1.txt");
out_file << "This_Is_A_Test_File" << endl;
out_file.close();
 
return 0;
}

There is nothing wrong with this code, and yet:

Originally Posted by DevC++

aggregate `std::ofstream out_file' has incomplete type and cannot be defined

Please help, this is just like the example script that tons of other sites give too!

Thanks, August.

lol, nothing wrong

Thanks Brain, I would have used WriteFile() to do this job, but I am making a pure DOS program. Why don't the examples have you include <fstream>?

What examples?

On some platforms you might get unlucky and the original code might work. However, whoever wrote the examples you speak of shouldn't have relied on that, since it is not guaranteed to work on all platforms. Basically, whenever you use a specific function, class or object from a library, you should explicitly include the header that declares it. You can almost always find out which header it is from your favorite library documentation.

You are right, I am just making a program for a system that only has MS-DOS on it, and the console.

Originally Posted by Cool-August

You are right, I am just making a program for a system that only has MS-DOS on it, and the console.

what version os MS-DOS ? Version 6.X or earlier. Then you need a 16-bit compiler with probably will not support <fstream> because most of those compilers are too old.