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hackervalley · Guest

Bonjour,
je code un petit example de partitionneur/ reconstituant de fichiers.

Mais j'ai des pertes d'octets lors de ces manipulations. Faut - il que
je considère en mode binaire le EOF ?

Si quelqu'un peut m'orienter ?

Merci

Voici le code, pour illustrer.

A++

http://hackervalley.free.fr

[split]

#include <iostream>
#include <iomanip>
#include <fstream>
#include <sstream>
#include <string>

using namespace std;

int main (int argc, char **argv)
{
string filename;

// If there is no command-line filename, have the user enter one
if(argc < 2)
{
cout << "Enter a filename: ";
cin >> filename;
cout << "Filename is: " << filename << endl;
cout << endl;
}
else
{
filename = argv[1];
}

ifstream infile;
infile.open(filename.c_str(), ios::in|ios::binary);

if(infile.good() == false)
{
cerr << "Error opening file: " << filename << endl;
return 1;
}

// Determine length of file
long beginPos, endPos, lengthFile;

infile.seekg(0,ios::beg);
beginPos = infile.tellg();
cout << beginPos << endl;
infile.seekg(0,ios::end);
endPos = infile.tellg();
cout << endPos << endl;

lengthFile = endPos - beginPos;

cout << "size of " << filename;
cout << " is " << lengthFile << " bytes." << endl;
cout << endl;

infile.close();

// Set number of parts of file and offset
unsigned int part;
long offset;

offset = 0;

do {
part = 1;
cout << "Enter Number of parts into file is split (Enter 1 to exit)
[1-99] : ";
cin >> part;
}
while (part < 1 || part > 99);
if ( part == 1 ) return 1;
cout << "Number of parts is: " << setfill('0') << setw(2) << part << endl;
offset = lengthFile / part;
cout << "Length part of file is: " << offset << " bytes." << endl;
cout << endl;

// Create parts of file
stringstream ss;
string partfilename;

beginPos = 0;
endPos = 0;

for (unsigned int counter = 0; counter < part; counter++)
{
ss.clear();
ss << filename << setfill('0') << setw(2) << counter + 1.0 ;
ss >> partfilename;
cout << "Create " << partfilename;

ofstream outfile;
outfile.open(partfilename.c_str(), ios::binary);
outfile.seekp(0,ios::beg);

char * buffer;
long size;

// Prevent to increase size of file with last buffer
if ((beginPos + offset) > lengthFile) endPos = lengthFile;
else endPos = beginPos + offset;

size = endPos - beginPos;

cout << " beginPos : " << beginPos ;
cout << " endPos : " << endPos << endl;

infile.open(filename.c_str(),ios::binary);
infile.seekg(beginPos,ios::beg);

buffer = new char [size];
infile.read (buffer,size);
outfile.write (buffer,size);

delete[] buffer;

outfile.close();
infile.close();

beginPos = ++endPos;

}

cout << "End of fltkSplit" << endl;
return 0;
}

[Merge]

#include #include <iomanip>
#include <fstream>
#include <sstream>
#include <string>

using namespace std;

int main (int argc, char **argv)
{
string baseFilename;

// If there is no command-line filename, have the user enter one
if(argc < 2)
{
cout << "Enter base of split filename ( foo for foo01): ";
cin >> baseFilename;
cout << "BaseFilename is: " << baseFilename << endl;
cout << endl;
}
else
{
baseFilename = argv[1];
}

unsigned int part;

do {
part = 1;
cout << "Enter Number of parts file is split (Enter 1 to exit) [1-99] : ";
cin >> part;
}
while (part < 1 || part > 99);
if ( part == 1 ) return 1;

// Test all part filename
stringstream ss;
string partfilename;

for (unsigned int counter = 0; counter < part; counter++)
{
ss.clear();
ss << baseFilename << setfill('0') << setw(2) << counter + 1.0 ;
ss >> partfilename;

ifstream infile(partfilename.c_str());

if(infile.good() == false)
{
cerr << "Error opening file: " << partfilename << endl;
return 1;
}
else
cout << "Test " << partfilename << " OK." << endl;

infile.close();
}

// Merge split filename

long beginPos, endPos;

beginPos =0;
endPos = 0;

for (unsigned int counter = 0; counter < part; counter++)
{
ss.clear();
ss << baseFilename << setfill('0') << setw(2) << counter + 1.0 ;
ss >> partfilename;

cout << "Read " << partfilename << " OK." << endl;

ifstream infile;

infile.open(partfilename.c_str(), ios::binary);
infile.seekg(0,ios::beg);

char * buffer;
long size;

infile.seekg(0,ios::end);
endPos = infile.tellg();
cout << endPos << endl;

size = endPos;

infile.seekg(0,ios::beg);

buffer = new char [size];
infile.read (buffer,size);

ofstream outfile;
// ios::app open for writing,add to end of file(append).
outfile.open(baseFilename.c_str(), ios::app | ios::binary);
beginPos = outfile.tellp();
cout << beginPos << endl;

outfile.write (buffer,size);

cout << "Merge " << partfilename << " OK." << endl;

delete[] buffer;

outfile.close();
infile.close();
}

cout << "End of fltkMerge" << endl;
return 0;
}

James Kanze · Guest

hackervalley wrote:

drkm · Guest

James Kanze <kanze@none> writes:

Horst Kraemer · Guest

drkm <usenet.fclcxx (AT) fgeorges (DOT) org> wrote:

Fabien LE LEZ · Guest

On Sun, 16 Jan 2005 10:37:39 +0100, Horst Kraemer
<h-kraemer (AT) lycos (DOT) de>:

drkm · Guest

Fabien LE LEZ <gramster (AT) gramster (DOT) com> writes:

Matthieu Moy · Guest

drkm <usenet.fclcxx (AT) fgeorges (DOT) org> writes:

Michel Michaud · Guest

Dans le message [email]vpqoefpv2wf.fsf (AT) ubaye (DOT) imag.fr[/email],
Matthieu Moy <MatthieuNOSPAM.Moy (AT) imag (DOT) fr.invalid> a écrit :

hackervalley · Guest

Bonjour à tous,

James Kanze wrote:

Gabriel Dos Reis · Guest

"Michel Michaud" <mm (AT) gdzid (DOT) com> writes:

Gabriel Dos Reis · Guest

hackervalley <hackervalley (AT) free (DOT) fr> writes:

[...]

hackervalley · Guest

Gabriel Dos Reis wrote:

Gabriel Dos Reis · Guest

hackervalley <hackervalley (AT) free (DOT) fr> writes:

kanze@gabi-soft.fr · Guest

drkm wrote:

kanze@gabi-soft.fr · Guest

Michel Michaud wrote: