Hi Brian: That is not a good idea since there is then a value in the file not related to the content subject matter of the file, a special record type or bvalue if you will. Checking for End Of File is a standard feature of any file type and the tools are already there to do that. In C# the reader will return a null value if I read the docs right and the peek command will check the next byte to be read to determine if the End Of File has been reached. You can do what you said and just add an entry for the literal EOF or something but that is not good practice. Use the tools provided for any job and write or hack new ones only if absolutely necessary or if you can get some performance benefit from the hack.
Rick USA----- Original Message ----- From: "Bryan Schulz" <b.schulz@xxxxxxxxxxxxx>
To: <programmingblind@xxxxxxxxxxxxx> Sent: Sunday, May 09, 2010 5:29 PM Subject: Re: checking for end of file, was...C# Writing to a file
hi, if you are manipulating the file, can you add *EOF* and test for that? Bryan Schulz----- Original Message ----- From: "Jamal Mazrui" <empower@xxxxxxxxx>To: <programmingblind@xxxxxxxxxxxxx> Cc: "Celia Rodriguez" <celia-rodriguez@xxxxxxxxxxxxx> Sent: Sunday, May 09, 2010 4:19 PM Subject: Re: checking for end of file, was...C# Writing to a filePerhaps this sample C# code may help. using System.IO; string sFile = @"C:\temp\test.txt"; string sText = File.ReadAllText(sFile); for (int i = 0; i < sText.Length; i++) { string sChar = sText.Substring(i, 1); if (sChar == ",") { // Do special processing } //if } // for Jamal On 5/9/2010 11:39 AM, Celia Rodriguez wrote:Hi,The thing is that I dumped all of the file into a string. I am reading thestring character by character checking for ",".So when I reach the end of the string I am crashing. Is there somethingfor end of the string? It is a very small file, maybe, about 5 records. Thanks, Celia Also so that I could -----Original Message----- From: programmingblind-bounce@xxxxxxxxxxxxx [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of David Engebretson Jr. Sent: Sunday, May 09, 2010 9:54 AM To: programmingblind@xxxxxxxxxxxxx Subject: checking for end of file, was...C# Writing to a file There is a character at the end of the file... might be 0x20? Don't remember off hand, but I'll bet there's a table at the end of your book. Cheers, D ----- Original Message ----- From: "Celia Rodriguez"<celia-rodriguez@xxxxxxxxxxxxx> To:<programmingblind@xxxxxxxxxxxxx> Sent: Sunday, May 09, 2010 7:50 AM Subject: RE: C# Writing to a fileHi again, Thank you for your suggestions. I was able to write and read to a file. Just one more thing, how do I check for end of file? I have to read the file and print the data onto a report. Thank you, Celia -----Original Message----- From: programmingblind-bounce@xxxxxxxxxxxxx [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of RicksPlace Sent: Saturday, May 08, 2010 6:35 AM To: programmingblind@xxxxxxxxxxxxx Subject: Re: C# Writing to a fileHi Again: If you are going to be writing often to your file you will wantto use the FileInfo Class instead of the File Class. It is pretty much the same exceptthat it is an instance class, it does not require a security check every time it is called and can be made threqad safe me thinks.If you are justlogging errors or something that you don't care about performance with thenthe File class is the way to go since you will not have to instantiate theclass in your code but it will run slower. Rick USA ----- Original Message ----- From: "RicksPlace"<ofbgmail@xxxxxxxxx> To:<programmingblind@xxxxxxxxxxxxx> Sent: Saturday, May 08, 2010 7:14 AM Subject: Re: C# Writing to a fileHi:First, I don't think I saw your file type, the ".txt" file type extensionin the file path for your file if I remember and that would throw an exception. Below is the MSDN Doc stuff I pulled from the File ClassDefinition that I thought might help. The complete document can be foundat: http://msdn.microsoft.com/en-us/library/ms143356.aspx if you want to read up on the File Class. Here is the copied stuff for the CSharp version: Copy using System; using System.IO; using System.Text; class Test { public static void Main() { string path = @"c:\temp\MyTest.txt" ; // RtNote, notice the .txt file extension in the above file path// Also, note the use of the @ sign as Jamal identified in a prior post.// This text is added only once to the file. if (!File.Exists(path)) { // Create a file to write to. string createText = "Hello and Welcome" + Environment.NewLine; File.WriteAllText(path, createText); } // This text is always added, making the file longer over time // if it is not deleted. string appendText = "This is extra text" + Environment.NewLine; File.AppendAllText(path, appendText); // Open the file to read from. string readText = File.ReadAllText(path); Console.WriteLine(readText); } } ----- Original Message ----- From: "Jamal Mazrui"<empower@xxxxxxxxx> To:<programmingblind@xxxxxxxxxxxxx> Cc: "Celia Rodriguez"<celia-rodriguez@xxxxxxxxxxxxx> Sent: Saturday, May 08, 2010 6:34 AM Subject: Re: C# Writing to a fileIn C#, you do not have to double the backslash characters if you precede the string literal with the @ symbol. Just put that symbol immediatelybefore the initial quote mark. Jamal On 5/7/2010 11:32 PM, Celia Rodriguez wrote:Thank you, but I tried the \\ and it is still giving me the followingerror Error 1 Unexpected character '\' Error 1 Unexpected character '\' ----- Thankyou, Original Message----- From: programmingblind-bounce@xxxxxxxxxxxxx [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Tyler Littlefield Sent: Friday, May 07, 2010 9:18 PM To: programmingblind@xxxxxxxxxxxxx Subject: Re: C# Writing to a file Hello, you need to escape your \ by doing \\. So, it'll look like: C:\\myfolder1\\myfolder2... ----- Original Message ----- From: "Celia Rodriguez"<celia-rodriguez@xxxxxxxxxxxxx> To:<programmingblind@xxxxxxxxxxxxx> Sent: Friday, May 07, 2010 8:15 PM Subject: C# Writing to a fileHi Varun, I tried writing to a file, but the comiler does not like the ? \. The following is what I coded.File.AppendAllText(C:\Documents and Settings\celia\My Documents\VisualStudio\Projects\TestCode,Data); It gives me an error on the \. Do you know what I need to do so it will except the \? 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