Some C# questions

[Spike]

I'm trying to get into a string the first line of a .txt file. But I'm getting an error.

Code: Select all

        private void Form1_Shown(object sender, EventArgs e)
        {
            FileStream istream;
            try
            {
                istream = new FileStream("config.txt", FileMode.OpenOrCreate, FileAccess.Read);
            }
            catch (Exception)
            {
            }

            // Associate a reader with the stream
            StreamReader reader = new StreamReader(istream);

            string text = reader.ReadLine();

            reader.Close();
        }

Error is in spanish but it's something like: "Use of the local variable not assigned 'istream' " on this line: StreamReader reader = new StreamReader(istream);

[zombie@computer]

It seems the FileStream file opening is failing. The idea of the try{} catch{} is that you handle exceptions in the catch statement. This code allows an exception, then continues with variables that may not have been set.

Depending on what you want, File.ReadAllLines() may be easier

[Haxel]

the compile error is just because istream isnt defined as anything in the same scope as where it's being used, try

FileStream istream = null;

[ankhsethamon]

Sorry.. my post is not helpfull.. XD I'm just curious... why is the error message in spanish? ( where r u from? XD )

[zombie@computer]

the compile error is just because istream isnt defined as anything in the same scope as where it's being used, try

FileStream istream = null;

if the error was something like error, trying to use uninitialized variable 'istream' then i think you are right.

[Spike]

I fixed it by initialicing the variable (yeah I always forget to do it on C#).

@ankhsethamon: lol I'm spanish that's why.

[ankhsethamon]

@ankhsethamon: lol I'm spanish that's why.

ya veo.. eso explica muchas cosas.. XD jeje. Algo así me imaginaba.

[Spike]

@ankhsethamon: lol I'm spanish that's why.

ya veo.. eso explica muchas cosas.. XD jeje. Algo así me imaginaba.

Lol you're spanish too? Maybe you've seen me on HL2spain...

[Spike]

I'm changing the title of the thread because I have more questions to do, and I don't know how many I'll have. I haven't founf any answer on google.

-I have the path of a file on a string, I know there is a simple way to get the file name from the file path (string Name = System.IO.Path.GetFileName(FilePath)), but now, I would like to go backwards from a path. So if I have C:/Folder1/Folder2 in a string, I would like to get C:/Folder1.

-I want to read a .VMT file as text, how do I have to open it? As a Binary file? Are VMT characters in ASCII or Unicode?

[ankhsethamon]

Lol you're spanish too? Maybe you've seen me on HL2spain...

hehe.. ^^ in fact I'm from México

...but now, I would like to go backwards from a path. So if I have C:/Folder1/Folder2 in a string, I would like to get C:/Folder1.

try adding "/../" at the end of your path... ".." means "one step back" in the directory hierarchy.

Code: Select all


fileDir = System.IO.Path.GetDirectoryName(filePath);
previousDir = fileDir + "/../";

 

I'm not pretty sure about this... let me know if works!

Saludos XD

[zombie@computer]

I'm changing the title of the thread because I have more questions to do, and I don't know how many I'll have. I haven't founf any answer on google.

-I have the path of a file on a string, I know there is a simple way to get the file name from the file path (string Name = System.IO.Path.GetFileName(FilePath)), but now, I would like to go backwards from a path. So if I have C:/Folder1/Folder2 in a string, I would like to get C:/Folder1.

-I want to read a .VMT file as text, how do I have to open it? As a Binary file? Are VMT characters in ASCII or Unicode?

string result = FilePath.substring(0,FilePath.trimend('/').lastindexof('/')+1);

-file.readalltext or file.readalllines works best

[Spike]

THNX

you well deserved the award

[Spike]

I've got another question. I've a .txt file with lots of writen lines, I would like to arrange all the file by alphabet. Is there any easy way of doing it?

[zombie@computer]

I've got another question. I've a .txt file with lots of writen lines, I would like to arrange all the file by alphabet. Is there any easy way of doing it?

if you use File.ReadAllLines() :

string[] lines = File.ReadAllLines(...);
Array.Sort(lines);

[Spike]

thnx:D