Double 12 wrote:
I have worked on the beaver_box_prompt function. The box works fine,
but getting the inputted value to the rest of the program doesn't
really. It is still not clear to me of which type the return value of
the function should be (gchar, gchar* or const gchar*) to transfer
the string in the right way. I hope you can teach me something about
it ;)
gchar: single character
gchar*: pointer to the first character of a sequence of characters
(aka. "string")
the const keyword is something like a write protection. if I declare a
variable const, i can't overwrite it's value.
example. if i got a variable
const gchar foo = 'a';
then i can't do something like this after it's declaration.
foo = 'b';
I'm still able to read from it but not write. this is often used for
parameters in functions, where this parameter is only used for
reading. this is especially used when you do not want accidently
overwrite the pointer. but carefull. even if I declare a variable
const gchar* foo = "Hello";
i still can do something like this
gchar* bar = foo;
bar[0] = 'B';
With pointers only the variable holding the pointer is write protected
but not the data the pointer is pointing to.
since you get the data from a text entry widget (or something like
that), you will receive a gchar* anyway (look at the gtk documentation
what the functions return. mostly you want to return the same thing).
gchar* is probably the right choice here (since i think you can't
return a const variable in C). Also you have to check wheter or not
the returned pointer has to be freed after use (that should also be
written in the gtk documentation. most of the gtk get_text () (or
something like that) functions require to free the space after use).
greetings
Tobias
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