Writing to File Using a Function

[Programmer3922]

I globally declared a file. Then in my main I opened the file, then called a function to write, and then closed the file in my main again. When I am in my function, do I need to send it the file, or does it recognize that its open and ready to write to from my main?

[MacGyver]

In reality, I don't think you should make the FILE * global, but if you do, then no, you don't have to send it to the function. Since it's global it can see it, but it won't recognize anything at all about the FILE * in question. If you call this function and try to read or write before opening the file, then disaster will probably strike.

[Programmer3922]

What would be the right syntax if I were to declare it in the main and send it in.

Here is my guess:

Function Declaration: void myFunction(FILE myFile)

File declaration in main: FILE *file
Function Call in the Main: myFunction(file)

Function:

void myFunction(myFile)
[

Writing to the file

]

I am just making a guess here, I am not too sure.

When I do it the global way, everything compiles and runs fine, until I go to make a fprintf statement in myFunction. Then it explodes.

[MacGyver]

You should pass a pointer to a file, not a FILE object itself. Other than that, it appears you might have the basic idea, although your syntax is way off.

[Programmer3922]

That is what I am unsure about is what the proper sytnax for sending and recieving files to functions are.

I mean I know how it works with int, float, etc..

Its just : void myFunction(int a)

Main:
number = 1;
myFunction(number)

void myFunction(int numberSendingIn)

...Function Operations...

What is the appropriate way to code it as a file instead of an int, float, etc..

[MacGyver]

Well, consider this for an int:

void myFunction(int i);

This for an int *:

void myFunction(int *i);

So for a FILE *:

void myFunction(FILE *f);