how to read from a formatted file, and then call object's methods

Discussion in 'C++' started by ding feng, Jun 24, 2003.

  1. ding feng

    ding feng Guest

    I have got formatted files. All of these file takes this form:
    obj1 method1 obj2 string1 obj3 string2 argument.

    Of course, each file can have maximum fields as shown above, or
    minimun fields
    like this:
    obj1 method1.

    For example, file1 can be like this:
    10 obj1 method1
    20 obj1 method2 obj2 string1 obj3 string2 argument1
    30 obj5 method3 obj1 string1 obj3

    Another example is as in file2:
    10 obj10 method55 obj30
    20 obj1 method7 obj3 string1 obj7
    30 obj11 method2 obj20 string1 obj30 string2 argument2

    As you can imagine, obj means object, the target is to read one line
    by one
    line. At each line, call object's method then go to next line until
    the final
    line reaches.

    The difficult for it is each line calls the different method by
    passing different parameters. For example, in file1, the first line do
    this: int obj1.method1(), however, the second line might do this: int
    obj1.methods2(obj2, string1, obj3, string2, argument1), then the third
    line do this: obj5.methods3(obj1, string1, obj3).

    I wonder whether it is possible to create a dynamic template, where
    the format is stored there. This template will store each field of
    each line dynamically. For example, int pos=0, in files1, the first
    field of the first line will be stored into firstobj[pos], the second
    field into method[pos], since the first line reaches end, the rest
    fields are set to null. then call firstobj[pos].method[pos](). then
    pos++. Then read second line, the first field firstobj[pos],
    method[pos], secondobj[pos], string1[pos], thirdobj[pos],
    string2[pos], argument1[pos]. Then call
    firstobj[pos].methods[pos](secondobj[pos], string1[pos],
    thirdobj[pos], string2[pos], argument1[pos]).

    The above is what I intend to do. However, it seems not practical to
    use arrays to store each field and call object method because each
    line has different length.
    ding feng, Jun 24, 2003
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