Re: convert image to Byte - C# Discussion Boards

31-Aug-07 4:29

Image img;
DataPhoto = new Byte[File.ContentLength];
img=Image.FromStream(DataPhoto);
the above code convert Byte to Image

my quastion how to convert image to Byte ???

Palestine

pmarfleet31-Aug-07 4:38

pmarfleet

31-Aug-07 4:38

Create a MemoryStream object and use the Image.Save to save the image data to the MemoryStream. Then read the contents of the MemoryStream into a byte array by calling its ToArray method.

Paul

TAREQ F ABUZUHRI31-Aug-07 4:40

31-Aug-07 4:40

can u give me example ?

Palestine

Steve Hansen31-Aug-07 4:41

Steve Hansen

31-Aug-07 4:41

MemoryStream ms = new MemoryStream();
img.Save(ms);
byte[] bytes = ms.ToArray();

leppie31-Aug-07 5:06

leppie

31-Aug-07 5:06

If you close the MemoryStream as per the other user's example code, you might get the same GDI+ exception. Best is to use it in a 'using' construct.

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TAREQ F ABUZUHRI31-Aug-07 9:49

31-Aug-07 9:49

please need example to know what u mean exactly ..

Palestine

Mairaaj Khan1-Sep-07 1:32

Mairaaj Khan

1-Sep-07 1:32

Normally, CLR (Common Language Runtime) manages garbage collections. But in certain situation there is a need to release the resources used by the object(s) as soon as possible. For this purpose, using statement can be used.
According to MSDN:

The using statement allows the programmer to specify when objects that use resources should release them. The object provided to the using statement must implement the IDisposable interface. This interface provides the Dispose method, which should release the object's resources.<br />
<br />
A using statement can be exited either when the end of the using statement is reached or if an exception is thrown and control leaves the statement block before the end of the statement.<br />

For the examples, see msdn[^]

Regards.

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error Array

TAREQ F ABUZUHRI31-Aug-07 4:26

Generic Error While running in localhost without port

31-Aug-07 4:26

i have this error
------
Array initializers can only be used in a variable or field initializer. Try using a new expression instead.
------
with this code
oEdit1.CustomButtons = new string[] {{"CustomName1","alert(\'Command 1 here.\')", "Caption 1 here", "btnCustom1.gif"},
{"CustomName2","alert(\\\"Command \'2\' here.\\\")","Caption 2 here","btnCustom2.gif"},
{"CustomName3","alert(\'Command \\\"3\\\" here.\')","Caption 3 here","btnCustom3.gif"}};

do u know how can solve this error

Palestine

Re: error Array

Steve Hansen31-Aug-07 4:42

Steve Hansen

31-Aug-07 4:42

Make that new string[][] { new string[] {"CustomName1","alert(\'Command 1 here.\')", "Caption 1 here", "btnCustom1.gif"}, new string[] {"CustomName2","alert(\\\"Command \'2\' here.\\\")"...

MahiRaju31-Aug-07 3:49

MahiRaju

31-Aug-07 3:49

Hi
I have converted one project vs 2003 to vs2005.But I getting error like this

Exception Details: System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.
Date:<%=DateTime.Now%>I got that error in Include file.Just i want to know how to get DateTime Date:<%=DateTime.Now%> .

gmahi

DllImport and cstring

Saamir31-Aug-07 3:28

Saamir

31-Aug-07 3:28

Hi guys,
I am trying to import a function from a visual c++ dll which uses cstring. I keep getting an error saying object reference not set to an instance of an object. I believe it is because of cstring and have read a few posts which pretty much explain that it is not possible to get around this without writing a wrapper in c++. Unfortunately I have never written a wrapper script and hopefully you have a solution around this. Please help!!!

S

sasa

leppie31-Aug-07 3:46

leppie

31-Aug-07 3:46

I replied a suggestion (just now) on your original thread. Try that, if it still fails, reply to this message, and I will see if I can help with that wrapper Smile | :)

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Saamir31-Aug-07 4:15

Saamir

31-Aug-07 4:15

Hi leppie, What do you mean by original thread, this is the only thread I have.

Please respond to this.

Thanks

S

sasa

leppie31-Aug-07 5:02

leppie

31-Aug-07 5:02

Hehe sorry, I was referring to this one http://www.codeproject.com/script/comments/forums.asp?msg=2206354&forumid=1649#xx2206354xx[^] D'Oh! | :doh:

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Difference b/w dispose() & finalize()

Saamir31-Aug-07 5:16

Saamir

31-Aug-07 5:16

Thank you for your response. I get the error saying Methods type signature is not pinvoke compatible. Any ideas?

S

sasa

ListBox

minniemooo31-Aug-07 3:12

minniemooo

31-Aug-07 3:12

hi,
How do I add numbers in a listBox?
eg. I have a list of numbers in my listbox and I want to add them and place the result in a textBox.

Re: ListBox

pmarfleet31-Aug-07 3:47

pmarfleet

31-Aug-07 3:47

Use a variable to maintain a running sum. Iterate through each item in the listbox. For each iteration, convert the value of the current item to a number and add its value to the current value of the running sum variable. Finally, write the value of the running sum variable to your textbox.

Paul

Re: ListBox

\laddie31-Aug-07 4:31

\laddie

31-Aug-07 4:31

Here is the code if you require Smile | :)

int sum =0;

for(int i=0;i

Dineshraj31-Aug-07 1:48

Dineshraj

31-Aug-07 1:48

What is the difference between dispose() and finalize()methods in c#?

Colin Angus Mackay31-Aug-07 2:00

Colin Angus Mackay

31-Aug-07 2:00

Dineshraj wrote:
dispose() and finalize()methods in c#?

Dispose() is an implementation of the IDisposable interface. It is used to clean up unmanaged resources from an object when it is no longer needed. You explicitly call the Dispose method.

The Finalize method (using the destructor syntax in C#) is called when the Garbage collector cleans up the object. It should not be created unless needed as it slows garbage collection. If it is needed it most likely will call the Dispose method (so that all your clean up code is in one place). You have no control over when the finaliser is called.

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martin_hughes31-Aug-07 2:48

martin_hughes

31-Aug-07 2:48

Does this mean that explicity creating a destructor, say:

~MyClass()
{
   ...
}

is just a different way of writing:

protected override void Finalize()
{
   ...
}

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Pete O'Hanlon31-Aug-07 3:12

Pete O'Hanlon

31-Aug-07 3:12

The ~ syntax will implicitly call the finalizer.

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Pete O'Hanlon31-Aug-07 2:07

Pete O'Hanlon

31-Aug-07 2:07

Dispose is a method on an interface (IDisposable) that tells you that you can free up some resources. It is not guaranteed to be called, but can be called either explicitly via the MyObject.Dispose method, or implicitly when the instance has been wrapped in an using block, e.g.

using (SqlConnection conn = new SqlConnection())
{
 ..
}  // The Dispose method will have been called here.

The finalizer is run by the garbage collector, so you have no idea when it will run (under normal conditions that is - it is possible to explicitly call a Finalizer, but this is generally bad practice). Now, if you implement IDisposable.Dispose() then it is normally good practice to suppress the Finalizer. This is done by calling the method GC.SuppressFinalize() in the Dispose method. To this end, I tend to write a message to the trace logs if I get into a Finalizer when I have a Dispose method. By doing this, I can see where I haven't freed up resources explicitly.

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