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I suggest you look into the Windows Media SDK, as well as DirectShow. Both will have the capability to capture a frame of a movie as a bitmap, without having to construct a bitmap file on disk.
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: He has a funny face. And he's my son.
Judah Himango
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Hi, how can I save an object in sqlserver by serialization without make a file in hard drive?
I wanto save it into an image datatype fild.
Thank you.
La realidad no es más que impulsos eléctricos del cerebro - Morpheus
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You could use System.Runtime.Serialization.Formatters.Binary.BinaryFormatter to format your object into a stream. From the stream, you can get the byte[] making up the object. You are then free to write the byte[] to an image column in a SQL database.
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: He has a funny face. And he's my son.
Judah Himango
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ok, but how can I know what capacity I need to use in the buffer (byte[])
Please write a code sample.
Thank you again!
La realidad no es más que impulsos eléctricos del cerebro - Morpheus
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Once you've formatted your object into a stream of some kind, like so:
BinaryFormatter formatter = new BinaryFormatter();
System.IO.MemoryStream stream = new System.IO.MemoryStream();
formatter.Serialize(stream, theObjectIWantToSave);
You can then create and initialize the buffer like this:
byte[] buffer = new byte[stream.Length];
stream.Read(buffer, 0, buffer.Length);
Then you're free to hand that byte[] over to SQL to be stored in the image column field.
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: He has a funny face. And he's my son.
Judah Himango
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Thank you so much!!!!!
This is what I looking for, but I only found file-serialization samples.
La realidad no es más que impulsos eléctricos del cerebro - Morpheus
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Hi, is me again.
My class is:
<br />
[Serializable]<br />
public class clsCalendario<br />
{<br />
public clsCalendario()<br />
{<br />
<br />
}<br />
<br />
private int m_Codigo;<br />
<br />
public int Codigo<br />
{<br />
get { return m_Codigo; }<br />
set { m_Codigo = value; }<br />
}<br />
<br />
private string m_Nombre;<br />
<br />
public string Nombre<br />
{<br />
get { return m_Nombre; }<br />
set { m_Nombre = value; }<br />
}<br />
<br />
}<br />
I try to save an object into image filed in sqlserver litke that:
<br />
clsCalendario cal = new clsCalendario();<br />
cal.Codigo = 23;<br />
cal.Nombre = "Macho";<br />
<br />
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter bf = <br />
new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter(); <br />
System.IO.MemoryStream stream = new System.IO.MemoryStream(); <br />
bf.Serialize(stream, cal);<br />
byte[] buffer = new byte[stream.Length];<br />
stream.Read(buffer, 0, buffer.Length);<br />
this.Dataset.Tables[0].Rows[0]["CalendarioNormal"] = buffer;<br />
The problem is that buffer have only 0 (zeros) in all the array
I try to read the object from image datafile in sql server like that:
<br />
byte[] buffer = (byte[])this.Dataset.Tables["DBRRecurso"].Rows[0]["CalendarioNormal"];<br />
System.IO.MemoryStream stream = new System.IO.MemoryStream(buffer);<br />
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter bf = <br />
new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter(); <br />
clsCalendario miCal = (clsCalendario)bf.Deserialize(stream);<br />
MessageBox.Show(miCal.Codigo.ToString() + " - " + miCal.Nombre);<br />
But I have the follow exception:
Fuente: mscorlib
Tipo: SerializationException
Descripción: Se llegó al final de la secuencia antes de terminar el análisis.
Origen: System.Runtime.Serialization.Formatters.Binary.__BinaryParser --> Void Run()
OR
Fuente: mscorlib
Tipo: SerializationException
Descripción: La secuencia Binary no contiene ningún BinaryHeader válido, 0 causas posibles, secuencia no válida o cambio de versión de objeto entre la serialización y la deserialización.
Origen: System.Runtime.Serialization.Formatters.Binary.__BinaryParser --> Void Run()
What I do wrong? 
Thank you!
La realidad no es más que impulsos eléctricos del cerebro - Morpheus
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Try this instead:
clsCalendario test = new clsCalendario();
test.Codigo = 42;
test.Nombre = "hola";
BinaryFormatter bf = new BinaryFormatter();
MemoryStream stream = new MemoryStream();
bf.Serialize(stream, test);
stream.Flush();
byte[] buffer = stream.ToArray();
this.Dataset.Tables[0].Rows[0]["CalendarioNormal"] = buffer;
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: He has a funny face. And he's my son.
Judah Himango
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Hi All,
Basically, I would like to encrypt the data/file at the client end and should be able to decrypt it at the server side. So that client/end user should not manipulate the auto generated file from the application(window). I've gone through some of the articles from the net and I have found three options to archieve this.
1) Symmetric
Adv: Can encrypt and decrypt using key values.
Disadv: If the end user decode the manage code then it is possible to identify the key values. Then they can also decrypt the file at their end.
2) Asymmetric
Adv: Can encrypt and decrypt using the public and private certificates.
3) Hash algorithum
Add and disadv more or less similar to (1).
So i prefer to go with point (2), i.e Asymmetric. If anyone has better solutions to archieve encryption and decryption of the file then please let me know.
Thanks & Regards,
Shiby Chacko
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hi Shiby
Way 2 is the only way to prevent the Client from decrypting data, but if you go that far that the user will debug your client he´ll be able to intercept the data after generating and before sending. This is a securityhole you can´t close.
If the data you want to send gets larger you should go a middle-way between 1 and 2, because with asymetric encryption you can only encrypt small blocks. (e.g. with rsa 2048 bit you can encrypt 245 byte which will result in 256 encrypted byte). Encrypting with a asymetric algorithm is also slower than a symetric one. The middleway would be then: encrypt everything with a randomly generated symetric key and encrypt only this key asymetric for passing it to the server.
Azraelgod
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Thanks for your response.
Is there any other way to archieve the encryption and decryption of file using manage code with security under consideration.
Regards,
Shiby Chacko
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Hi there!
Well the most secure thing is to use a hybrid of 1 and 2. In this way you close the security hole of disadv of 1 and make the encryption fast(2..is slow).
First of all use Symmetric for the file.
As regards the key, you can use asymmetric encryption, so that the client can never get hold of the key value to decrypt!
You shall have 3 keys..
1...which will encrypt the data (symetric key)
2...private key to encrypt symetric key(1)
3...public key to decrypt symetric key(1)
In this way the client side, does not know that the encrypted symetric key, is really encrypted. So when he/she tries to decrypt, all he gets is garbage!
GaMBiT---> aND ReVeNGe WiLL Be
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Thanks for your response.
Is there any other way to archieve the encryption and decryption of file using manage code with security under consideration.
Regards,
Shiby Chacko
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Is there any way to assign a double click event to a radio button.
I found the ControlStyles bit, but not able to change it on the radiobutton.
Thanks so much in advance.
-Dwayne
*****************
"I know how hard it is for you to put food on your family." —GW
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Unfortunately there is no double click event assigned for radio buttons. You can however create your own radio button control by trying to inherit radio button... maybe (I have never tried to modify standard controls myself).
But why would you assign double click event on a radio button? Radio buttons are to choose between two or more options.
Niklas Henricson
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I am using the radiobuttons as a psudo-menu and the double click would launch the object from the nemu.
I thought about recreating it, with inheritance and changing. Not sure if it is worth it though.
Not a big deal, just suprised to see it gone from vb6.
*****************
"I know how hard it is for you to put food on your family." —GW
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you could have a global variable, that would tell whether or not it was already clicked, and if it is clicked a second time within a certain amount of time, call your double click function. You would have to delay any code for the single click event (assuming you want the capability to single click it, which I wouldn't understand why you wouldn't need that capability) untill the possibility of the second click has already occurred. if you understand what I mean. I'm a beginner, but this is the workaround I would take.
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Hi,
I have a project in which I access a mySQL Database and extract totals from it that are shown on a Form within a DataGridView. Can anyone tell me is it possible to access the values in the cells of this DataGridView from the Form, inorder to create an action dependant on a comparison of two of the cells values?
Thanks
Denis
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hi guys i want to strip ceartin information from between tags but they differ in some things:
1:
<b><a.*?>(strip this 1)</a></b>
2:
<b>(strip this 2)</b>
3:
<b><a.*?><b>(strip this 3)</b></a></b>
Using the same regex object(i.e one expression for all 3), it got to be....
please can any one help
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thanx but wud it be ok to do it with tags:
<a.*?>?|+
how wud the expression look like...
regards
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Does anyone know a nifty way to automaticly convert a VB.Net project into a C# project.
Sharp Develop has a function that converts from VB.Net -> C# or the other way, from C# -> VB.Net.
Although this function does a conversion it doesn't analyze the code.
For example:
Left(str,10) is allowed in VB but not in C#, however Sharp develop's converter doesn't detect this.
Regards
Hmitosh
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There is nothing that will do a perfect, and syntactically legal, conversion between the two. You'll always have to do some conversion by hand, even if the thing does analysis.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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We have a VB.NET to C# converter - Instant C# - that will typically do over 99% of the conversion work. (download the demo at www.instantcsharp.com)
The Microsoft.VisualBasic namespace functions that have direct and safe equivalences in the System namespace are converted, but the ones that don't are left as calls to the Microsoft.VisualBasic namespace.
David Anton
Tangible Software Solutions
www.tangiblesoftwaresolutions.com
Home of the Instant C# VB.NET to C# Converter and the Instant VB C# to VB.NET Converter
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