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C# 2.0 supports nullable types, if you;re using an older version you'll have to kluge it in one way or annother.
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Thank you.
String conversion it is then.
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If you're using .NET 1.x, then no, you can't assign null to a decimal. .NET 2.0 has nullable types, which means you can. However, that would require you to develop for 2.0 only, which will be released in November. So...it's up to you.
Picture a huge catholic cathedral. In it there's many people, including a gregorian monk choir. You know, those who sing beautifully. Then they start singing, in latin, as they always do: "Ad hominem..."
-Jörgen Sigvardsson
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This doesn't result in a null value. This results in the decimal type have a value of 0. Value types cannot be null in the .NET Framework 1.0 and 1.1.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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i've just posted a question like this, but i've got an answer not adapted at what i mean...
I explain better.
I can open a .avi file using this:
string file_path = @"c:\myfile.avi";
string sComand = "open \"" + file_path + "\" type mpegvideo alias...";
mciSendString(sComand, null, 0, IntPtr.Zero);
OK it just works, but i need to open a file from memory stream (System.IO.Stream, otherwise byte[] ) instead to load a file from the HardDisk.
How???
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Well, you can't really hand off a stream to whatever you're using to play an AVI file because it probably doesn't understand streams. However, you could use the System.IO.IsolatedStorage classes to store the stream to a file in a temporary location and then open it from there. Just a thought...
Picture a huge catholic cathedral. In it there's many people, including a gregorian monk choir. You know, those who sing beautifully. Then they start singing, in latin, as they always do: "Ad hominem..."
-Jörgen Sigvardsson
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i can't do it becouse i can't allow the user can get freely that file.
other ways? Are you sure about the not possibility to use tht function with a source stream?
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If you're really that concerned about not letting the person at the data, then you may want to look into setting up a Windows Media Server then and just serving up the files as streams. That would seem to be the best way to go about doing it.
As for whether or not the player you're using can understand the System.IO.FileStream class, it would have to be written in .NET, or at least have .NET based functions...which none of the major players I've seen are. So that answer is no.
Picture a huge catholic cathedral. In it there's many people, including a gregorian monk choir. You know, those who sing beautifully. Then they start singing, in latin, as they always do: "Ad hominem..."
-Jörgen Sigvardsson
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i've found aviStreamRead() function
Now i world to use it in c#, how?
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What player are you using? How is this function defined? Could you give me a link to the SDK documentation for the player you're using?
Picture a huge catholic cathedral. In it there's many people, including a gregorian monk choir. You know, those who sing beautifully. Then they start singing, in latin, as they always do: "Ad hominem..."
-Jörgen Sigvardsson
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If you have to stream comming from a Windows Media Server and are using the MediaPlayer control on your form, you've got nothing to worry about. Just point the MediaPlayer at the URL for the stream you want.
You never said anything about where the stream was coming from or what type it is...
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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to make that the user have to have installed on its computer windows media player, and i'm forced to use windows media player gui.
I want just play a avi file but now calling it from a path as c:\myfile.avi but using a FileStream or a Byte[].
I think it is possible in some way, but how? DirectShow?
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OK. The stream isn't from a file and it isn't comming from a server. So, where is this stream comming from?
Maybe you can come up with something from this[^] sample.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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the file stream came from the embedded source.
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I have been writing a simple client/server application which functions just fine without encryption. However, I need to add encryption to be compliannt with regulations.
I am using RijndaelManaged objects for encryption. Both sender and reciever have the same hard-coded legal Keys and IV's.
Once I have a TCP socket established, I set my Network Stream using tcpClient.GetStream().
I use one of the stream reader/writer classes (all of them fail so far). For example, I will send a sting using a BinaryWriter bWrite. Then I will look to receive some string using BinaryReader bRead.
On the Send Side:
RijndaelManaged crypt = new RijndaelManaged();
//Insert code to set Key and IV
NetworkStream netStream = tcpClient.GetStream();
CryptoStream coutStream = new CryptoStream(netStream,crypt.CreateEncryptor(Key,IV),CryptoStreamMode.Write);
BinaryWriter bWrite = new BinaryWriter(coutStream);
bWrite("Some Cool String");
bWrite.Flush();
coutStream.FlushFinalBlock();
CryptoStream cinStream = new CryptoStream(netStream,crypt.CreateDecryptor(Key,IV),CryptoStreamMode.Read);
BinaryReader bRead = new BinaryReader(cinStream);
String receivedString = bRead.ReadString();
tcpClient.Close();
On the Recieve Side:
RijndaelManaged crypt = new RijndaelManaged();
//Insert code to set Key and IV
NetworkStream netStream = tcpClient.GetStream();
CryptoStream cinStream = new CryptoStream(netStream,crypt.CreateDecryptor(Key,IV),CryptoStreamMode.Read);
BinaryReader bRead = new BinaryReader(cinStream);
String receivedString = bRead.ReadString();
CryptoStream coutStream = new CryptoStream(netStream,crypt.CreateEncryptor(Key,IV),CryptoStreamMode.Write);
BinaryWriter bWrite = new BinaryWriter(coutStream);
bWrite("Some Cool String");
bWrite.Flush();
coutStream.FlushFinalBlock();
tcpClient.Close();
PROBLEM:
If I simply send from one program and recieve on the other -- everything works fine. It is when I actually send/receive from both that the program hangs.
Any thoughts?
-- modified at 12:09 Wednesday 12th October, 2005
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Are you sure you're not encountering some sort of race condition where the TCP/IP stack is being blocked by a send/receive? If it works fine when one sends and then the other receives, could it be that something like this happens:
ClientA Sends
ClientB Sends
ClientA is blocked because it's waiting for ClientB to receive, so it doesn't pick up any incoming calls
ClientB is blocked because it's waiting for ClientA to receive, so it doesn't pick up any incoming calls
Does that sound logical?
Picture a huge catholic cathedral. In it there's many people, including a gregorian monk choir. You know, those who sing beautifully. Then they start singing, in latin, as they always do: "Ad hominem..."
-Jörgen Sigvardsson
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It sounds logical -- but when I take out the encryption, everything works fine.
For ex, if I remove all references to encryption and attach the BinaryReader/Writers to the network stream, the program functions without trouble. It is when I add the CryptoStreams in that I have trouble.
I wonder if it has something to do with the read/write modes.
What I do note is that with encryption, if I send from A and then close the TCP connection, B recieves just fine. However, B fails to receive until the TCP connection closes.
Very wierd.
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Hey everyone, I already know how to run a macro on an office document with automation, but I was wondering how I can use an external file to specify the macro?
Basically I want to write a Console application that will accept a macro file (BAS file exported from the VBA editor) as a parameter and run it on any specified files. So again....
How do I read a macro from a file then execute it in Word ?
thanks in advance for the help.
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I'm new to c# and i'm creating a console application. I want to add a new List() to my app, but i'm getting a reference error. i've added the line using System.Collections. I've read that List is in System.Collections.Generic but I don't have access to this, only System.Collection.Specialized. Do I have to add a reference in the solution explorer and if so could you point me to which one.
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There is no List class for collections in the .NET BCL 1.0 or 1.1. Is this what you're using (VS.NET 2002 and 2003)?
There is a <a href="http://msdn2.microsoft.com/en-us/library/6sh2ey19(en-US,VS.80).aspx" rel="nofollow">List<T> (List Generic)</a>[<a href="http://msdn2.microsoft.com/en-us/library/6sh2ey19(en-US,VS.80).aspx" target="_blank" rel="nofollow" title="New Window">^</a>] class in the .NET Framework 2.0 (VS.NET 2005 beta) though, under System.Collections.Generic.
You can't use the .NET Framework 2.0 with Visual Studio .NET 2002 or 2003.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hello,
Does anybody have any idea about How to work with bar code machine and how to scan and get barcode in C#.Net.
Please provide me some code/Example resource.
Thanks in Advance.
|Muhamad Waqas Butt|
waqasb4all@yahoo.com
www.sktech.freewebspace.com
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This is the 5th or 6th time I've seen this question this month.
Barcode scanners work either with a serial port or, more commonly, are connected to the keyboard port and act just like a second keyboard. Your application can't tell the difference between what is "typed" by the scanner and what is typed by the keyboard.
Normally, the focus is set to a control where the user then scans a barcode. The scanner "types" the information into this control, and so on...
Now, if you want to automatically set the focus so the user doesn't have to, you'll have to handle the keyboard events of the form. You'll have to program the barcode scanner (consult the scanner documentation on how to do this) to prepend and/or append a unique sequence of characters to every barcode it scans. You'll be looking for character combinations prepended and/or appended to the barcode key sequence in the form's keyboard handler events. When you see this combination, you'll have to change the focus to the appropriate control.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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 Well Thanks for your reply. I will try to search-out some resource for this. And if you know about something about it (for start programming) please inform me.
Thanks and best regards,
|Muhamad Waqas Butt|
waqasb4all@yahoo.com
www.sktech.freewebspace.com
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The best resource you have is the manual on the scanner. When I did this, I spent about 10 minutes reading through the manual. After that, 60 seconds to write the first application and start scanning bar codes.
I learn best by doing...
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Which Barcode Scanner you use and could you sends your piece of code?
Or
Can I download Barcode Scanner Manual from internet?
Thanks in Advance.
|Muhamad Waqas Butt|
waqasb4all@yahoo.com
www.sktech.freewebspace.com
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