n00b in need of C++ help.

[sb iq]

Here is my problem:

I have a file with raw data that is 18304 bytes. It is raw, no file extension. I need to split my file into smaller 768-byte files. This means I should end up with 71 files that are 768 bytes, and one file that is 384 bytes.

Now, obviously, I sure as hell don’t want to open up my file in Notepad or Hex Workshop, and cut and paste data into new files 72 times. I’d get carpel-tunnel syndrome and probably go insane.

I need to write a C++ program that will do this for me.

The problem is it’s been years since I’ve taken a C++ course and I forgot a lot, and I mean a lot.

How should my code look like? Can someone explain this to me?

Also, where can I download a good free C++ compiler program? I lost my Microsoft Visual C++ installation CDs years ago. :(

Any help would be greatly appreciated, as I sure as Hell don’t want to cut, paste, and save files over and over again 72 times.

[euphoria]

Get linux, it has a free C/C++ compiler called GCC ;) And it's good.

[sb iq]

Are there any good free C++ compilers for XP? Sorry to sound like a n00b, but I have used Linux/Unix environments in one of my classes, and I wasn't too comfortable around it.

[Toasty]

Check out Dev-C++ (http://bloodshed.net/). It's fairly simple to set up and use. Here's a fairly crude program I whipped up that should do what you want (there are already many available to accomplish this function, but you may benefit from seeing the source code) - just copy and paste it into Dev-C++ if you like:

#include <iostream>
#include <fstream>
#include <sstream>
#include <math.h>

using namespace std;

const unsigned int BUFFER_SIZE = 1024;

int main(int argc, char *argv[]) {

char name[256];
unsigned int chunkSize;

start:
cout << "Enter path to file to be split: ";
cin >> name;

cout << "Enter size of each chunk in bytes: ";
cin >> chunkSize;

if(chunkSize == 0) {

cout << "Zero is bad. :( Aborting..." << endl;
goto start;

}

ifstream fileIn(name, ios::in | ios::binary);

if(!fileIn) {

cout << "Error opening file. Aborting..." << endl;
goto start;

}

fileIn.seekg(0, ios::end);
streampos fileLength = fileIn.tellg();
fileIn.seekg(0, ios::beg);

char copyBuffer[BUFFER_SIZE];

for(unsigned int chunkNumber = 0; ; ++chunkNumber) {

if(fileLength <= 0) break;

cout << "Writing chunk number " << chunkNumber << "..." << endl;

ostringstream chunkNameStream;
chunkNameStream << name << chunkNumber;

string chunkName = chunkNameStream.str();

ofstream chunkOut(chunkName.c_str(), ios::out | ios::binary | ios::trunc);

if(!chunkOut) {

cout << "Error creating \"" << chunkName << "\". Aborting..." << endl;
goto start;

}

unsigned int chunkCopied = 0;

while(fileLength > 0 && chunkCopied < chunkSize) {

unsigned int toBeCopied = min((unsigned long long) min(BUFFER_SIZE, chunkSize - chunkCopied), (unsigned long long) fileLength);
unsigned int copied = fileIn.readsome(copyBuffer, toBeCopied);
chunkOut.write(copyBuffer, copied);

fileLength -= copied;
chunkCopied += copied;

}

chunkOut.close();

}

fileIn.close();

cout << "Operation complete." << endl;

goto start;

return 0;

}
EDIT: Just as a side note, it will only work for file chunk sizes up to 4GB when compiled for 32-bit systems. (This could easily be fixed with little modification, but I'm off to bed right now. :P)

[smcd]

For a "Visual C++ 6" type feel of environment, you might try MinGW Studio, Click here to go to http://www.parinyasoft.com/ (http://www.parinyasoft.com/) it is free and there are download options to have it bundled with a compiler package as well.

[sb iq]

Toasty, thank you SO MUCH for posting that! ^_^

[Toasty]

My pleasure. Sorry the code is void of comments, but I was tired and in a hurry, so you get what you pay for. :P

[pegasus001]

One c++ compiler for windows is devc++, just google it and you will surely find it. It`s not more than 10 mb.

[Garstyciuks]

Didn't Toasty already mentioned it and included a link to it?

[pegasus001]

Didn't Toasty already mentioned it and included a link to it?

Sorry , i just read it. It was dummy of me but i replied in a rush last time. Won`t happen again.