dev-cpp-users

[Dev-C++] File Handling

[Noorez K. <coo...@ho...>]

This is a code that should copy a .exe file. But i'm not sure what function 
call to use to copy one bit at time. Can someone fill it in.

#include <iostream>
#include <cstdlib>
#include <fstream>
#include <string>
using namespace std;

int main()
{
    ofstream out_file;
    ifstream in_file;

    cout << "Program copyer. The .exe extension will be added for you\n";

    char name1[234];
    cout << "Enter name of file: ";
    cin.getline(name1, 234);
    strcat(name1,".exe");

    in_file.open(name1, ios::binary);
    out_file.open("newfile.exe",ios::binary);

    //code needed hear

    system("pause");
}

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[Dev-C++] File Handling

[Noorez K. <lor...@ho...>]

I'm having some problems with my file handling. The problem is very strange. 
The functions that I attached are all called from the Window Procedure. Here 
is a quick explanation. If I call the SaveAsText() function first, and use 
the SaveText() method, everything saves to the text file fine, when I look 
with notepad. But if I use the OpenText() or OpenTextDrop() function to open 
a text file, then try to use the SaveText() function, nothing goes to the 
text file at all. Can someone help me?

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[Dev-C++] File Handling

[Noorez K. <lor...@ho...>]

I have a program that needs to read in a file only 500 chars at a time. I 
found this example in a tutorial but am confused about a part of it.

  ifstream file ("example.txt", ios::in|ios::binary|ios::ate);
  if (file.is_open())
  {
    size = file.tellg();
    memblock = new char [size];
    file.seekg (0, ios::beg);
    file.read (memblock, size);
    file.close();
   ...

When file.read() is called, does it move the file pointer, or do i have to 
do it? If i have to move it to read the next 500 chars, would i set the 
pointer at the value 500?

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RE: [Dev-C++] File Handling

[P.D. v. Z. <pd...@xs...>]

Well, here's a version (didn't base it on your code, so variable names and
such are different). Note that it isn't very efficient though (it copies one
byte at a time).

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

using namespace std;

int main()
{
	string from,to;
	
	// Get filenames
	cout << "Source file: ";
	getline(cin, from);
	
	cout << "Destination file: ";
	getline(cin, to);
	
	// Open files
	ifstream is(from.c_str(), ios::binary);
	ofstream os(to.c_str(), ios::binary);
	
	if (!is.is_open() || !os.is_open())
	{
		cerr << "Unable to open files." << endl;
		return 1;
	}
	
	// Create some iterators based on the file
	unsigned char uc;
	while (is)
	{
		uc = is.get();
		if (is.eof())
			break;
		os.put(uc);
	}
	
	// Exit app
	return 0;
} 


If your application will only run on Windows (or Win32 systems in general),
you can use the "CopyFile" function defined in windows.h, which will
undoubtedly be faster.

Here's the declaration of this function, in case you're interested:

BOOL CopyFile(
  LPCTSTR lpExistingFileName,
  LPCTSTR lpNewFileName,
  BOOL bFailIfExists
);

Hope this helped,


Paul

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of Noorez
Kassam
Sent: Wednesday, January 14, 2004 7:59 PM
To: dev...@li...
Subject: [Dev-C++] File Handling

This is a code that should copy a .exe file. But i'm not sure what function 
call to use to copy one bit at time. Can someone fill it in.

#include <iostream>
#include <cstdlib>
#include <fstream>
#include <string>
using namespace std;

int main()
{
    ofstream out_file;
    ifstream in_file;

    cout << "Program copyer. The .exe extension will be added for you\n";

    char name1[234];
    cout << "Enter name of file: ";
    cin.getline(name1, 234);
    strcat(name1,".exe");

    in_file.open(name1, ios::binary);
    out_file.open("newfile.exe",ios::binary);

    //code needed hear

    system("pause");
}

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RE: [Dev-C++] File Handling

[P.D. v. Z. <pd...@xs...>]

Oops... the code also has some old comments in it ... I based it on some
other code I had lying around which read words from a file into a vector,
sorted them, and output only the unique words in alphabetical order... so
ignore the comments :D
Actually 'borrowed' that code from Stroustrup, I believe it was somewhere in
"The C++ Programming Language"... very elegant way of using iterators and
streams... too bad I couldn't use it for this problem (the formatted
input/output operators are used like that, which yields incorrect results
for binary files).


Paul
 

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of Noorez
Kassam
Sent: Wednesday, January 14, 2004 7:59 PM
To: dev...@li...
Subject: [Dev-C++] File Handling

This is a code that should copy a .exe file. But i'm not sure what function 
call to use to copy one bit at time. Can someone fill it in.

#include <iostream>
#include <cstdlib>
#include <fstream>
#include <string>
using namespace std;

int main()
{
    ofstream out_file;
    ifstream in_file;

    cout << "Program copyer. The .exe extension will be added for you\n";

    char name1[234];
    cout << "Enter name of file: ";
    cin.getline(name1, 234);
    strcat(name1,".exe");

    in_file.open(name1, ios::binary);
    out_file.open("newfile.exe",ios::binary);

    //code needed hear

    system("pause");
}

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Re: [Dev-C++] File Handling

[Per W. <pw...@ia...>]

No need to copy one bit at the time. You wan't to copy as large blocks as
possible to keep code efficient. Create a reasonably large buffer - a
reasonably large number n * 4096 should be good - and then read/write
until done. Just notice that the last read/write block might be smaller.

/Per W

On Wed, 14 Jan 2004, Noorez Kassam wrote:

> This is a code that should copy a .exe file. But i'm not sure what function
> call to use to copy one bit at time. Can someone fill it in.
>
> #include <iostream>
> #include <cstdlib>
> #include <fstream>
> #include <string>
> using namespace std;
>
> int main()
> {
>     ofstream out_file;
>     ifstream in_file;
>
>     cout << "Program copyer. The .exe extension will be added for you\n";
>
>     char name1[234];
>     cout << "Enter name of file: ";
>     cin.getline(name1, 234);
>     strcat(name1,".exe");
>
>     in_file.open(name1, ios::binary);
>     out_file.open("newfile.exe",ios::binary);
>
>     //code needed hear
>
>     system("pause");
> }
>
> _________________________________________________________________
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>
>
>
> -------------------------------------------------------
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> advanced branching capabilities and atomic changes on 50+ platforms.
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