C++ File Dialogs & IO

I've done a bit of Mac Programming, and am a Reasonable  C++ programmer.

How do use the standard Dialog box for the saving and loading of Classes?

For example, in the following class, how would I implement the loadFile, and saveFile methods? Also, please provide the function you would use to initialize the toolbox.

class      myClass
{
      public:
      unknown            loadFile(unknown);
      unknown            saveFile(unknown);

      private:
      string      myString;
      int            myInt;      
};
rozellAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

rozellAuthor Commented:
Edited text of question
0
rozellAuthor Commented:
Adjusted points to 150
0
roovCommented:
>how would I implement the loadFile methods?
short numTypes = -1;
SFTypeList typeList;
StandardFileReply reply;
StandardGetFile(nil, numTypes, typeList, &reply);
if (reply.sfGood) {
// user selected a file
 //reply.sfFile is an FSSpec (mac specification record) for the file to load
}

>how would I implement the saveFile methods?
StandardFileReply reply;
StandardPutFile("\pPlease select destination", "\pNo name", &reply);
if (reply.sfGood) {
 //reply.sfFile is an FSSpec (mac specification record) for the saved file
}

>Also, please provide the function you  would use to initialize the toolbox.
static InitToolbox()
{
      InitGraf((Ptr) &qd.thePort);
      InitFonts();
      InitWindows();
      InitMenus();
      TEInit();
      InitDialogs(nil);
      InitCursor();
}
0
Become a CompTIA Certified Healthcare IT Tech

This course will help prep you to earn the CompTIA Healthcare IT Technician certification showing that you have the knowledge and skills needed to succeed in installing, managing, and troubleshooting IT systems in medical and clinical settings.

rozellAuthor Commented:
Good, this gets me the dialog boxes, but how do I output "myString", and "myInt" to the file, and then retrieve them? I guess this is the part that is really stumping me.
0
roovCommented:
Well, now you'd do the following, assuming the variable mySpec containg the FSSpec you've acquired.
1. Create the file, if required:
 anErr = FSpCreate(&mySpec, fileCreator, fileType, smSystemScript);
fileTpye and fileCreator can be any 4-byte constants that are meaningful to you.
2. Open it, and receive a reference to it:
short refNum = 0;
anErr = FSpOpenDF(&mySpec, fsRdWrPerm, &refNum);
form read/write permission.
3. Read /Write using:
long count = size of my buffer;
void* mybuffer = pointer to data
anErr = FSRead(refNum, &count, buffPtr);

and:
anErr = FSWrite(refNum, &count, buffPtr);

repectivly.

4. Close the file using:
anErr = FSClose(refNum);

Hope this fill out the data...
0
rozellAuthor Commented:
This is working, however it doesn't appear to be a C++ approach to the problem. Typically, when saving things in C++ one wants to be able to stream the data to disk. This way the programmer doesn't need to know everything about the classes he/she wishes to write to disk.

Is it possible to stream the data to disk in this manner, and if so how.
0
roovCommented:
In such case, the auumption must be that you know the File Specification (fspec) of the file you intend to stream to/from.
You originally requested dialogs, so that's what you got.

If you have the fspec, you can write a basic IO class for streaming, though the standard c++ io classes work if you don't need the resource fork.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
System Programming

From novice to tech pro — start learning today.