void Engine::EnableLogging()
{
//opens current file and destroys it contents
ofstream a_file ( "logging.txt");
}
void Engine::WriteToLog()
{
a_file << "Did my Implementation Work?" << endl;
a_file.close();
}
Need help with file I/O.......
Author
So I want to add logging to a program I have. I know the basics of file I/O but I am stuck on something.
I want to get EnableLogging() to open and clear a file, and upon exiting Enablelogging() I want the file to still be open so that I can write to it with WriteToLog(). As of now when the program exits EnableLogging() a_file looses scope which makes the use of it in WriteToLog() throw an error. Any suggestions...
Thanks
Chad
Make a_file a member variable of your Engine class. Then it won't go out of scope until your Engine does.
Edit: Too slow
Edit: Too slow
Author
Little confusin....
So what your saying is remove ofstream a_file ("logging.txt");
and make it a private memeber variable of the engine class.
Thanks
Chad
So what your saying is remove ofstream a_file ("logging.txt");
and make it a private memeber variable of the engine class.
Thanks
Chad
They mean:
class CDummy{ std::ofstream a_file; public: CDummy(void); ~CDummy(void); void EnableLogging(void) { this->a_file.open("logging.txt"); } void WriteLog(void) { this->a_file << "Did my Implementation Work?" << std::endl; this->a_file.close(); }};
Author
Alright...another dumb question....do I have to pre-put a .txt file in my project folder or will it automatically generate?
Quote:Original post by raz0r
They mean:
void EnableLogging(void)
{
this->a_file.open("logging.txt");
}
*** Source Snippet Removed ***
I have a question about this. Why can you not open a file via the a_file member itself: a_file("C:\\file.txt");, instead of invoking the member method, .open? I've notice the method I'm describing works outside of a class scope but not inside one, what's the reason?
Thanks,
- xeddiex
Doing a_file(...) results in calling the appropriate constructor(if there is one based on what you pass). In a class for example, you declare your stream, and call open in your own constructor or member-function.
This topic is closed to new replies.
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