Increase file size

[Evil_Cowgod]

ARGH! Im going mad! I just cant work out how to increase the file of an executable without stopping it from working! Could somone please please (im despret) show me how i can make a program increase the size of "C:\file.exe" by 100 bytes?

THANKS!

[abdul]

What compiler are you using? Just put a lot of debugging information in your exe and it'll increase the file size by somewhat.
PS: People actually try to decrease the file size and you're increasing it?

[Evil_Cowgod]

Im using dev C++, but i dont want to make a big program, i want a normal sized program that increases the size of a different program :P

[parksie]

Originally posted by Evil_Cowgod
ARGH! Im going mad! I just cant work out how to increase the file of an executable without stopping it from working! Could somone please please (im despret) show me how i can make a program increase the size of "C:\file.exe" by 100 bytes?

THANKS!

You should just be able to open it as a binary file then append 100 NULL bytes to it:

#include <iostream>

using namespace std;

int main() {
    ofstream output("program.exe", ios::binary | ios::append);
    char block[100];
    memset(block, 0, 100); // i think this is the right way round...

    output.seekg(ios::end, 0);

    output.write(block, 100);
}

...that's just typed straight into the reply box so I'm not sure if it'll compile -- the theory should work though. I did some work on self-extracting archives and never had any problems by just appending the data to a stub program.

[Daok]

***Time out***

Explaine me that line please : put.seekg(ios::end, 0);

[parksie]

.seekg goes to a specific location in the file. You give a position and an offset, the position is either the start, end, or current position, and the offset is how far away from that.

The documentation for seekg() will give you the details

[Daok]

seekg = input
seekp = output

[parksie]

Oops, yeah sorry.

http://www.cplusplus.com/ref/iostrea...eam/seekp.html
http://www.cplusplus.com/ref/iostrea...eam/seekg.html

[Daok]

Here is the program and it work but I have a problem by the determination of the size to increment. I wanted the user write the number of null character he wants in the third arguments but I wanted that in Ko so I *1024 but that doesn't increment well.

#include <fstream>
#include <iostream>
#include <string>

using namespace std;

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

    // 0 = name, 1 = file, 2 = size
    if (argc != 3)
    {
        cout << "Missing argument";
        exit(0);
    }//End if

    
    ofstream fileOut(argv[1], ios::binary | ios::app);

    //Si le fichier n'existe pas alors on quitte
    if (!fileOut)
    {
        cout << "File not found";
        exit(0);
    }//End if
                /****Problem is here to calculate in ko****/
    unsigned int iSize = (atoi(argv[2]))*1024;

    
    char *cData = new char[iSize];

    memset(cData, 0, iSize);

    fileOut.seekp(0,ios::end);
    fileOut.write(cData,fileOut.tellp());
    fileOut.close();

}//End Main 

But that code can be compiled without problem.
Daok

[Daok]

Here is the final version and all work correctly without any problem.

#include <fstream>
#include <iostream>
#include <string>
//#include <time.h>
#include <windows.h>

using namespace std;

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

    // 0 = name, 1 = file, 2 = size
    if (argc != 3)
    {
        cout << "Error : Missing argument" << endl;
        exit(0);
    }//End if

    
    ofstream fileOut(argv[1], ios::binary | ios::app);

    //Si le fichier n'existe pas alors on quitte
    if (!fileOut)
    {
        cout << "Error : File not found" << endl;
        exit(0);
    }//End if

    if (atoi(argv[2]) > 10240)
    {
        cout << "Error : Can not enlarge more than 10 megs each time";
        exit(0);
    }//End if
    unsigned int iSize = (atoi(argv[2]) * 1024);

    char *cData = new char[iSize];

    memset(cData, 0, iSize);

    fileOut.seekp(fileOut.tellp());
    fileOut.write(cData,iSize);
    fileOut.close();
    string cMessage[] = {"Copyright Daok","Daok Production", "Daok Own Ya"};
    
    DWORD dwStart = GetTickCount();

    /*srand((unsigned)time(NULL));
    cout << cMessage[rand() % 3] << endl;
    */
    cout << cMessage[dwStart % 3] << endl;
    
}//End Main