|
im using IO and i need to have the program create a text file if it doesnt exsist already. i know its goin to be a if statement but im not sure of much else. any help would be appreciated.
|
|
|
|
|
Take a look at the classes in the System.IO namespace. Their naming is quite intuitive and the documentation contains many examples, so you should be able to figure this out on your own.
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook www.troschuetz.de
|
|
|
|
|
The following will append an existing text file or create a new file if it doesn't already exist:
StreamWriter sw = File.AppendText( "myfile.txt" );
sw.WriteLine( "Blah blah blah..." );
sw.Close();
Hope this helps
Regards
Wayne Phipps
____________
Time is the greatest teacher... unfortunately, it kills all of its students
View my Blog
|
|
|
|
|
Before I even started with C# last year I build some of those... in SS2005AS
I always used Visual Studio to browse them, question is what is best way to implement those things in stand alone application?
Some idea?
|
|
|
|
|
I'm new to C#, so please bear with me on terminology(and spelling). I have a small example application with a form that tries to bind XMLDataDoc instances to a DataGridView. I swap in and out the instances of XMLDataDocs to my DataGridView, depending on which data I’m working with at the time.
My problem is that I can’t seem to control when to actually commit the data to my XMLDataDoc instances. At first when I was learning about binding between DataGridView and XmlDataDoc objects, I thought there was an intrinsic instant updating of the data to the XMLDataDoc when one changes data in the DataGridView, but I’m not able to understand when or where exactly this happens. The commit success is not consistent, in fact I can only get it to happen when add new data to the target row, then click into a new row, and then save.
I’m binding to my DataGridView:
newDataClass1.XmlDataDoc.Load(some_XMLFile_on_a_drive);
BindingSourceVaultItem.DataSource = newDataClass1.XmlDataDoc.DataSet.Tables["ItemColumn"];
DataGridView.DataSource = BindingSourceVaultItem;
If I then create a another XMLDataDoc instance and bind it to the DataGridView:
BindingSourceVaultItem.DataSource = newDataClass2.XmlDataDoc.DataSet.Tables["ItemColumn"];
The DefaultValuesNeeded event populates all the key data, except the itemColumn, which has its column value AutoIncrement set to true. Together, they satisfy my schema rules.
My issue is that after trying to change data within a new row of the DataGridView, and then trying to save data off to an XML file, I receive a “root element” error. I put in a DataGridView.CommitEdit() in the CurrentCellDirtyStateChanged event, in hopes to push the data at the cell level.
Am I using BindSource incorrectly for multiple XMLDataDoc instances? Any help is greatly appreciated and thanks in advance.
|
|
|
|
|
I stumbled onto my idiocy. I did not understand how BindingSource works. I did not realize it was a acting like an additional buffer, just as a DataAdapter does. I simply needed to throw in a BingSource.EndEdit() after my DataGridView.CommitEdit() and whala. I also, not only have a layer of indirection, but a buffer to validate before the real commit to the datasource.
|
|
|
|
|
hello! can anyone teach me how to transfer an audio file from one pc to another using udp? i've tried it myself by transferring the file by blocks however, when the transferring is done, the transferred file is not equivalent to the original file..maybe the some datagrams sent were not able to reach the destination.. how will i handle this?
mumwei 
|
|
|
|
|
Hello,
I havent tried through UDP but I have successfully done through TCP packets.
System.IO.FileStream fstream = new System.IO.FileStream(files[j].FullName, System.IO.FileMode.Open, System.IO.FileAccess.Read);
byte[] buffer = new byte[fstream.Length];
fstream.Read(buffer, 0, buffer.Length);
fstream.Close();
//writing to the network stream//
outStream = this.Client.GetStream();
for (int i = 0; i < buffer.Length; i++)
{
//outStream.Write(buffer, 0, buffer.Length);
outStream.WriteByte(buffer[i]);
}
outStream.Close();
You just need to transfer bytes.
Try this and tell me..
Regards ![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif) ,
nishu
|
|
|
|
|
hi, at last somebody replied to my post..thanks. hmmm... would your recommendation be applicable to realtime audio streaming? my plan actually is to stream the audio packets in real time. since i don't know how to do that yet, i just tried to at least successfully transfer the audio file.yet unfortunately, i wasn't able to..
mumwei
|
|
|
|
|
Hello,
Yes @ clientside thread you receive and can directly play the audio.
Regards ,
nishu
|
|
|
|
|
Hello,
I test through iTunes.I received the bytes from iTunes and was success.
If you have any further question....keep posting..
Regards ,
nishu
|
|
|
|
|
thanks.. but can it handle transferring of way way too large audio files? as in audio files with a span of more than an hour?
mumwei
|
|
|
|
|
Hello,
Correct you should have seperate thread to transfer real time audio file to seperate clients.and you can transfer any length of file as long as your thread got terminate.
Regards ,
nishu
|
|
|
|
|
(If this is not the right forum for this question, please let me know which one).
I need to produce an xml like the following
<customer_list_data>
<customers>
<customer>
<customer_name detail="Customer_1"/>
<customer_status detail="active"/>
</customer>
<customer>
<customer_name detail="Customer_22"/>
<customer_status detail="inactive"/>
</customer>
</customers>
</customer_list_data>
(Notice one extra parent "customer_list_data" above. DataSet seems to have a problem reading in its xsd and properly identifying customer 'table'.)
for which the xsd is:
<xsd:schema targetNameSpace="customerbase"
xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:tns="customerbase">
<xsd:element name="customers_list_data">
<xsd:complexType>
<xsd:all>
<xsd:element name="customers">
<xsd:complexType>
<xsd:all>
<xsd:element name="customer">
<xsd:complexType>
<xsd:all>
<xsd:element
name="customer_name" minOccurs="1" maxOccurs="1">
<xsd:complexType>
<xsd:attribute name="detail" type="xsd:string" use="required"/>
</xsd:complexType>
</xsd:element>
<xsd:element
name="customer_status" minOccurs="1" maxOccurs="1">
<xsd:complexType>
<xsd:attribute name="detail" type="xsd:string" use="required"/>
</xsd:complexType>
</xsd:element>
I need a list object in excel that would take user input for a list of:
customer_name, customer_status values.
Note that these correspond to the "detail" attributes of the above xsd, and
Not to the xml text elements.
Now I want to produce an XmlDocument that matches the above xsd, based on
the data filled by the user in the list object.
What is the best way to do that in [ C#, VSTO 2005 SE, Excel 2003 ] ?
Note: Ideally I want to use data binding using this xsd and want an
XmlDocument to be ready already when the user clicks a button in the excel
sheet. I do Not want to use strongly typed datasets.
-- modified at 19:20 Friday 16th February, 2007
|
|
|
|
|
DateTime dateDOB = rdr.GetDateTime(iDOBOrdinal);
It says this is an invalid cast.
When I do this:
DateTime dateDOB = DateTime.Parse(rdr.GetDateTime(iDOBOrdinal));
Is says no method Parse found.
How do I do this?
Thanks for your time!
The only way to speed up a Macintosh computer is at 9.8 m/sec/sec.
|
|
|
|
|
It says that it's an invalid cast because you are not fetching a date from the database. What is the data type of the field that you are fetching the data from?
ExpertComing wrote: Is says no method Parse found.
Are you really sure that it's saying that there is no Parse method? I would rather expect it to say that there is no overload of the Parse method that takes a DateTime as a single parameter.
---
single minded; short sighted; long gone;
|
|
|
|
|
How can i remove a " from a string? i can't use IndexOf or any other function on it since it considers " a beginning of a string as a parameter, so...how can i remove a " from a string then? o_O
|
|
|
|
|
Use the Replace method, replace the " with an empty space.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
|
|
|
|
|
but i'm saying...you just can't, at the second you write " in VS it makes it like a beginning of a string, waiting for a closing "...
|
|
|
|
|
Oh, OK. YOu didn't make that clear. \" works, or if you use @ then "" works and \ otherwise means \. In a string like this:
"\\This\\is\\a\\string"
comes out as \This\is\a\string, because the \ is used as an escape character. If you put a @ at the front, then the \ just means \.
@"\This\is\a\string"
As you've been told, \" is how you specify quotes, quotes are the only thing that you can still specify in a @ string, with double quotes"
@"I have a single ""word"" in quotes"
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
|
|
|
|
|
sharpiesharpie wrote: i can't use IndexOf or any other function on it since it considers " a beginning of a string as a parameter
Yes, you can, you just don't know how. 
To put a quote character in a string you use double quotes. This is a string that contains a single quote character: """"
---
single minded; short sighted; long gone;
|
|
|
|
|
|
Sorry, I gave you a VB solution.
But it really felt like a VB question...
In C# you use \" to put a quote inside a string.
---
single minded; short sighted; long gone;
|
|
|
|
|
You need to use the special escape sequences to specify a quote. To remove a quote use the following, assuming their is a string 'This is a "quote"' assigned to the variable str.
You would declare it as:
String str="\'\"This is a \"quote\"\'";
int index=str.indexof("\"");
Other escape sequences that can be used:
\n - newline
\" - double quote
\\ - backslash
\b - backspace
\t - tab
\r - carriage return
\' - single quote
These escape sequences were taken from my AP Programming book specifc to java, but I know most of them work with .NET languages if not all of them.
Regards,
Thomas Stockwell
Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.
Visit my homepage Oracle Studios[ ^]
|
|
|
|
|
Thank you! works just perfect !
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
