Hi Everyone,
I was working on this app for a while tonight and i was wondering could someone help me.
I am making a app where you drag and drop files into the listbox and the filename shows in the listbox i have got that part out the way now i am on getting the filenames in the listbox to be appended to certain lines of an .ini file (for example like listbox entry 1 will go on line 32 so on and so forth.) here is what i hvae so far any and all help is appreciated button2 is where i want the process to occur Click Here to See picture
using
System;using
System.Collections.Generic;using
System.ComponentModel;using
System.Data;using
System.Drawing;using
System.Text;using
System.Windows.Forms;using
System.IO;namespace
WindowsApplication1{
public partial class Form1 : Form{
public Form1(){
InitializeComponent();
}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e){
}
private void listBox1_DragEnter(object sender, DragEventArgs e){
// make sure they're actually dropping files (not text or anything else) if (e.Data.GetDataPresent(DataFormats.FileDrop, false) == true) // allow them to continue // (without this, the cursor stays a "NO" symbole.Effect =
DragDropEffects.All;}
private void listBox1_DragDrop(object sender, DragEventArgs e){
// transfer the filenames to a string array // (yes, everything to the left of the "=" can be put in the // foreach loop in place of "files", but this is easier to understand.) string[] files = (string[])e.Data.GetData(DataFormats.FileDrop); // loop through the string array, adding each filename to the ListBox foreach (string file in files){
listBox1.Items.Add(file);
}
}
private void button2_Click(object sender, EventArgs e){
}
private void button1_Click(object sender, EventArgs e){
}
private void button3_Click(object sender, EventArgs e){
// To remove currently selected item:listBox1.Items.Remove(listBox1.SelectedItem);
}
private void button4_Click(object sender, EventArgs e){
listBox1.Items.Clear();
}
}
}
adding listbox content to certain lines of a text file
LornaJoy
Here is a more .Net 2.0 way to do it. And with more error checking.
public static void InsertLines(
string filename,
ICollection<string> lines,
int linenumber)
{
if (filename == null)
{
throw new ArgumentNullException("filename");
}
if (lines == null)
{
throw new ArgumentNullException("lines");
}
string[] fileLines = File.ReadAllLines(filename);
int fileLength = fileLines.Length;
if (linenumber < 0 || linenumber > fileLength)
{
throw new ArgumentOutOfRangeException("linenumber");
}
int linesCount = lines.Count;
Array.Resize<string>(
ref fileLines,
fileLength + linesCount);
Array.Copy(
fileLines,
linenumber,
fileLines,
linenumber + linesCount,
fileLength - linenumber);
lines.CopyTo(fileLines, linenumber);
File.WriteAllLines(filename, fileLines);
}
Morse
Hi!
You need to append (to the end) of some text file new lines or insert them into some specific place inside text file
If you need append - simplest way is File.AppendAllText()
Juan Foegen
Thank you very much BioSlayer for the reply. Still there is a problem with large files, as in all examples.
werg
If your file is not large (less than few MB), then you can open file, read it's content into memory array, change array and write things back. Like this:
List
<string> lines = new List<string>();using
(System.IO.StreamReader reader = new System.IO.StreamReader(@"c:\file.txt")){
string line; while ((line = reader.ReadLine()) != null){
}
}
// do changes in lines list
using
(System.IO.StreamWriter writer = new System.IO.StreamWriter(@"c:\file.txt")){
foreach (string line in lines){
}
}
Dale Shetler
I think it's still 99.9999% acceptable choice to load whole file in memory - text files larger than 1 MB is really hard to find (except log files, but they typically not need to have insertions, just appending).
But anyway, PJ. - thanks for interest in performance subject. Did you see this proposal You welcome to drop a line there!
http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=329219&SiteID=1
XgenX
i wanted to insert them into a specific place inside the text file
thanks for the help
gtmulg
I dropped a line, sorry for voting the dark-side
DavidWalker
atv4fun
C Howell
Here is a little example:
public void InsertLines( string filename, string[] lines, int linePosition )
{
ArrayList buffer = new ArrayList();
using(StreamReader reader = new StreamReader( filename ))
{
int lineNumber = 0;
string line = null;
bool added = false;
while( (line = reader.ReadLine()) != null )
{
lineNumber++;
if( lineNumber == linePosition )
{
buffer.AddRange( lines );
added = true;
}
else
{
buffer.Add( line );
}
}
if( !added )
{
buffer.AddRange( lines );
}
}
using(StreamWriter writer = new StreamWriter( filename, false ))
{
foreach( string line in buffer )
{
writer.WriteLine( line );
}
}
}
cnSoftware