Passing a File Handle as a parameter to a function?

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Is this possible? I would like to open an input file in one function, operate on the data in another and then pass it back.
Also, how do I set up a program to print the output to a printer?
Thanks. jimbob

Posted 2-Mar-11 3:02am

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Piccadilly Yum Yum · Accepted Answer · 2011-03-02T03:15:00

Solution 1

C#

FILE *fhandle;
int my_function (FILE *my_file_handle){
   ...
}
fhandle = fopen (argv[1],"w");
my_function (fhandle);

see also http://www.linuxquestions.org[^]

Posted 2-Mar-11 3:15am

Piccadilly Yum Yum

Updated 2-Mar-11 3:20am

v2

Comments

[no name] 2-Mar-11 15:24pm

Good answer.

OriginalGriff 3-Mar-11 2:44am

Short, sweet, and accurate - well done! 5!

Sergey Alexandrovich Kryukov · Accepted Answer · 2011-03-02T06:16:00

Not only this is possible, but in many cases it is good to do so for software reuse and abstraction: you may need to abstract, for example, a set of write operations from file. In this way, you can use the same writing method on different files and combine different writing methods on the same file.

There is not need to "pass in back" though, because you really want to open and close file in the same function.

—SA