ofstream file;
int noob=50;
file.open("thingy.dat");
file << noob << endl;
Quick .dat question
Author
Howdy,
OK, so I encountered a small problem with .dat files. I am doing this:
Just to make teh file (test program)
But now I want to access the variable "noob" from .dat file "file" in a different program. How do I do that?
Quote:Original post by Acid rainIn short, you do the opposite:
But now I want to access the variable "noob" from .dat file "file" in a different program. How do I do that?
ifstream file;int noob;file.open("thingy.dat");file >> noob;There's more to it of course (error checking, for one thing), but that's the essence of it.
Author
Does that only work for DOS apps? I want to grab the value and pass it to a function that Renders it to the screen. How do I do that?
Quote:Does that only work for DOS apps?No, it's just C++ - it has nothing to do with DOS (not directly at least).
Quote:I want to grab the value and pass it to a function that Renders it to the screen. How do I do that?Depends on what you mean by 'render'. If you just want to display the value, you can print it to the console using a global stream object such as cout.
Author
By render I meen DRAW to the screen. I have a function ( from Allegro library ) that excepts an integer and blits it to the screen. How would I pass the variable "noob" from file "file" to such a function? I JUST need to grab the "noob" variable.
Quote:Original post by Acid rainAfter extracting the value from the file stream as demonstrated in my previous example, just pass the noob variable as an argument to the Allegro function in question. (I'm not familiar with the Allegro API, so I can't be more specific than that.)
By render I meen DRAW to the screen. I have a function ( from Allegro library ) that excepts an integer and blits it to the screen. How would I pass the variable "noob" from file "file" to such a function? I JUST need to grab the "noob" variable.
Author
What if I wanted to do something like this:
So that I could open the .dat file in windows NOTEPAD and edit the variables value. How would I then load the variable?
ofstream file;int noob=50;file.open("thingy.dat");file << "NOOB: " << endl;file << noob << endl;So that I could open the .dat file in windows NOTEPAD and edit the variables value. How would I then load the variable?
Quote:Original post by Acid rainEditing the text file is unrelated to reading and writing the file in C++ - you don't have to do anything special in your code to make this possible. If the file contains the text "NOOB: 1", you can open it in NotePad, change the '1' to a '2', save it, run the program that reads the file and prints the value to the screen, and the program will display the value '2'. It's as simple as that.
What if I wanted to do something like this:
*** Source Snippet Removed ***
So that I could open the .dat file in windows NOTEPAD and edit the variables value. How would I then load the variable?
The only caveat here is that you've now complicated the file format somewhat by writing out the string "NOOB: " prior to the variable value, so you'll have to take this into account when reading the data back.
Author
I opened the file in NOTEPAD and it read:
NOOB: 50
I tried reading the value after I edited it, but I can't. When I try reading it with my program, the new number doesn't come up. I think it's trying to read the string "NOOB:" as the number. How do I make it load from AFTER the "NOOB:" string?
NOOB: 50
I tried reading the value after I edited it, but I can't. When I try reading it with my program, the new number doesn't come up. I think it's trying to read the string "NOOB:" as the number. How do I make it load from AFTER the "NOOB:" string?
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