Input from file instead of cin

[Arks]

Hi coders, I need your help for a program that I'm doing!
I need to parse a text file, so I open it, read it and put the text in a buffer:

        int len;
    char *buff;
 
    ifstream is;
    is.open ("text.txt", ios::binary );
 
    is.seekg (0, ios::end);
    len= is.tellg();
    is.seekg (0, ios::beg);
 
    buffer = new char [len];
 
        is.read (buff,len);

Now I found this code:

    istreambuf_iterator<char> bit(cin), eit; // get stdin iterators
    Parsing test(bit, eit);  // parse and load the text
        printFile(&test);   // print the text structure

and here my questions:
1) istreambuf_iterator<char> bit(cin), eit; ------> "cin" is the "keyboard" input??
2) how can I modify this code to use the content of the file instead of the "keyboard" input?

[JosAH]

Hi coders, I need your help for a program that I'm doing!
I need to parse a text file, so I open it, read it and put the text in a buffer:

        int len;
    char *buff;
 
    ifstream is;
    is.open ("text.txt", ios::binary );
 
    is.seekg (0, ios::end);
    len= is.tellg();
    is.seekg (0, ios::beg);
 
    buffer = new char [len];
 
        is.read (buff,len);

Now I found this code:

    istreambuf_iterator<char> bit(cin), eit; // get stdin iterators
    Parsing test(bit, eit);  // parse and load the text
        printFile(&test);   // print the text structure

and here my questions:
1) istreambuf_iterator<char> bit(cin), eit; ------> "cin" is the "keyboard" input??
2) how can I modify this code to use the content of the file instead of the "keyboard" input?

1) Yep, cin is an istream attached to the standard input (the keyboard usually).

2) replace 'cin' by your 'is'. 'is' is also a proper istream.

kind regards,

Jos

[Arks]

1) Yep, cin is an istream attached to the standard input (the keyboard usually).

2) replace 'cin' by your 'is'. 'is' is also a proper istream.

kind regards,

Jos

Thank you for the quick answer, as I thought I have to replace 'cin' with 'is'.
Unfortunatelly I think that the function that has to print the content of the file doesn't work and I have no idea how to fix it!

[Arks]

Is anyone able to tell me quite specifically what this code does??
Any help is appreciated!!

void printMimeStructure(MimeEntity* pMe, int tabcount = 0)
{
    Header& h = pMe->header();                   
    for(int c = tabcount; c > 0; --c)            
        cout << "    ";                            
    cout << h.from() << endl;
 
    MimeEntityList& parts = pMe->body().parts(); 
 
    // cycle on sub entities list and print info of every item
    MimeEntityList::iterator mbit = parts.begin(), meit = parts.end();
    for(; mbit != meit; ++mbit)
        printMimeStructure(*mbit, 1 + tabcount);
}

I think that it parses a mail file and print the FROM, am I right??
Cause I'm trying to pass to this function a file, that I open in main(), using this:

        //my posted code
        ifstream is;
    is.open ("text.txt", ios::in );
 
    is.seekg (0, ios::end);
    len= is.tellg();
    is.seekg (0, ios::beg);
 
    buff= new char [len];
 
    is.read (buff,len);
 
    istreambuf_iterator<char> test1(is), test2;
    int VarTest = imTestP | imTestE;
    MimeEntity me(test1, test2, VarTest );
        printMimeStructure(&me);

But it doesn't parse anything!
In fact instead of printing the From field it prints '/'.
Something wrong in my posted code??

[Arks]

No hints!?

[Arks]

I've done these passes, but the funny things is:
1) Start without Debugging;
2) VS2k5 opens the DOS window;
3) I can see only the flashing _ of DOS and nothing else;
4) after some seconds the system is slowing down and it freezes, have to restart!!

I think that the problem is here:

    MimeEntity me(bit,eit);                            // parse and load message
        printMimeStructure(&me);                        // print msg structure

In fact if I comment out these lines, I can see the:
"Press any key to continue . . ."
nothing else but the program exits instead of doing an infinite loop!

[JosAH]

Is anyone able to tell me quite specifically what this code does??
Any help is appreciated!!

It is next to impossible to tell what an almost random piece of code is supposed
to do; especially if the presumed author of that code also doesn't know what it
does or is supposed to do. C++ doesn't help you one bit here because of all
that fancy operator overloading. Any guess is as good as another.

kind regards,

Jos

[Arks]

It is next to impossible to tell what an almost random piece of code is supposed
to do; especially if the presumed author of that code also doesn't know what it
does or is supposed to do. C++ doesn't help you one bit here because of all
that fancy operator overloading. Any guess is as good as another.

kind regards,

Jos

The funny thing is that the presumed author isn't me, but the author that releases the code that generates the library, which I'd like to use.
But I don't understand how this code doesn't work at all (the one that the author posted on his homepage).

Btw thank you for the answer! Bye

[JosAH]

The funny thing is that the presumed author isn't me, but the author that releases the code that generates the library, which I'd like to use.
But I don't understand how this code doesn't work at all (the one that the author posted on his homepage).

Btw thank you for the answer! Bye

You do know that the majority published on home pages is just trash don't you?
I'd say: contact the author about this piece of code. All the best.

kind regards,

Jos

[Arks]

You do know that the majority published on home pages is just trash don't you?
I'd say: contact the author about this piece of code. All the best.

kind regards,

Jos

No, if I publish something on my blog (C++ ideas or code) I release working code! :D

Thank you again!