Re: How can I create a binary buffer of an image from a file? - C# Discussion Boards

How can I create a binary buffer of an image from a file?

thomasa28-Dec-05 2:46

28-Dec-05 2:46

Something like

<br />
private byte[] getImageBytes()<br />
{<br />
byte[] buffer = null;<br />
FileStream templateStream = File.Open(@"C:\MyImage.gif", FileMode.Open);<br />
buffer = new byte[templateStream.Length];<br />
templateStream.Write(buffer, 0, (int)templateStream.Length);<br />
templateStream = null;<br />
return buffer;<br />
}<br />

The code runs but I only get a buffer containing zero's

Thanks
Thomas

Re: How can I create a binary buffer of an image from a file?

Judah Gabriel Himango28-Dec-05 4:27

Judah Gabriel Himango

28-Dec-05 4:27

Try flushing the file stream (and also, you MUST dispose the FileStream as well). Setting it to null is pointless; you only need to do that in Java.

private byte[] getImageBytes()
{
   byte[] buffer = new byte[templateStream.Length];
   
   using(FileStream templateStream = File.Open(@"C:\MyImage.gif", FileMode.Open))
   {
      templateStream.Write(buffer, 0, (int)templateStream.Length);
      templateStream.Flush();
   }
   return buffer;
}

Please note that if you're using the latest version of the .NET framework, you can use the File.ReadAllBytes method, which is more efficient and requires only a single line of code:

private byte[] getImageBytes()
{
   return File.ReadAllBytes(@"c:\MyImage.gif");
}

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I'm currently blogging about: Bought a House!
Judah Himango

Re: How can I create a binary buffer of an image from a file?

leppie28-Dec-05 6:49

leppie

28-Dec-05 6:49

Judah Himango wrote:
templateStream.Write(buffer, 0, (int)templateStream.Length);

Copy & paste error, and the real problem :p

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Re: How can I create a binary buffer of an image from a file?

Judah Gabriel Himango28-Dec-05 7:09

Judah Gabriel Himango

28-Dec-05 7:09

Heheh, good catch.

Re: How can I create a binary buffer of an image from a file?

S. Senthil Kumar28-Dec-05 19:31

S. Senthil Kumar

28-Dec-05 19:31

Judah Himango wrote:
Setting it to null is pointless; you only need to do that in Java.

OT, but I thought the Java GC also worked the same way as .NET, it's mark and sweep and doesn't require references to be set to null?

Regards
Senthil
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Re: How can I create a binary buffer of an image from a file?

Judah Gabriel Himango29-Dec-05 4:13

Judah Gabriel Himango

29-Dec-05 4:13

In Java, this is a common way of letting the GC know you're done with it. With .NET, it isn't needed. I believe the Java GC would eventually clean up objects even if they weren't set to null, but doing so would supposedly help it along.

Re: How can I create a binary buffer of an image from a file?

thomasa28-Dec-05 22:04

thomasa

28-Dec-05 22:04

Thanks, just one thing that was horrably wrong, it should be

templateStream.Read(buffer, 0, (int)templateStream.Length);

by using the templateStream.Write(...) it zero's out the image

so it should be

<br />
private byte[] getImageBytes()<br />
{<br />
   byte[] buffer = new byte[templateStream.Length];<br />
   using(FileStream templateStream = File.Open(@"C:\MyImage.gif", FileMode.Open,FileAccess.Read)) <br />
   {<br />
      templateStream.Read(buffer, 0, (int)templateStream.Length);<br />
      templateStream.Flush();<br />
   }<br />
   return buffer;<br />
}<br />
<br />

Re: How can I create a binary buffer of an image from a file?

leppie28-Dec-05 6:51

leppie

28-Dec-05 6:51

thomasa wrote:
templateStream.Write(buffer, 0, (int)templateStream.Length);

You should be reading from the file, not writing. Anyways your file is blank now, so you will have to create the image, else you will carry on getting zero's.

^{xacc.ide-0.1.1 released! :) Download and screenshots}

Re: How can I create a binary buffer of an image from a file?

Dave Kreskowiak28-Dec-05 8:08

Dave Kreskowiak

28-Dec-05 8:08

Like leppie said:

// Open a filestream on "C:\MyImage.gif" for Read/Write.
FileStream templateStream = File.Open(@"C:\MyImage.gif", FileMode.Open);
 
// Create an array of bytes with every element initialized to 0.
buffer = new byte[templateStream.Length];
 
// WRITE the array of 0's to the file!!!  :wtf:
templateStream.Write(buffer, 0, (int)templateStream.Length);

Shouldn't that be READ??? In either case, the file has already been destroyed when you ran this code for the first time. You'll have to correct the code to Read, then replace the .GIF file with a known good copy.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Im having a problem with this Icon class

imsathy28-Dec-05 2:15

imsathy

28-Dec-05 2:15

Hi.....

Im workin on Icon class where im gettin this exception at the declarartion of the icon obj

private Icon myIcon= new Icon(typeof(Form1)).Assembly.GetManifestResourceStream("winapptry.app.ico" ));

An unhandled exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll

with additional info as

Additional information: Could not find file "..\Visual Studio Projects\winapptry\bin\Debug\winapptry.app.ico".

just dunno how to sort tht out

sathy

-- modified at 8:15 Wednesday 28th December, 2005

Re: Im having a problem with this Icon class

Robert Rohde28-Dec-05 5:45

Robert Rohde

28-Dec-05 5:45

First of all you have forgotten a "(" so your code won't even compile.

Check the following:
1. You have a file named "app.ico" in the same project as Form1 (and not in a subfolder).
2. This file is a valid icon.
3. You have set its build action to "Embedded Resource".
4. The root namespace of your project is named "winapptry".

Re: Im having a problem with this Icon class

imsathy28-Dec-05 18:57

imsathy

28-Dec-05 18:57

Thanks a lot Robert Cool | :cool:

"(" this is bcoz i edited the code here

its the third point is wat i missed out.....

GREAT!!!!!!!

sathy

DataBind Issue

HolyGrandFather28-Dec-05 1:57

HolyGrandFather

28-Dec-05 1:57

Hi ..

i have a few textBoxes that are bounded to a tableview...
but whenever i change my ROWFILTER at the tableview , the Bounded textboxes remain the same...

this is the databind code:

UpdateCoptxtMa.DataBindings.Add("Text",source[0],"Ma");
UpdateCoptxtFirstName.DataBindings.Add ("Text",source[0],"FirstName");
UpdateCoptxtLastNAme.DataBindings.Add ("Text",source[0],"LastName");
UpdateCoptxtAddress.DataBindings.Add ("Text",source[0],"Address");
cboYehida.DataBindings.Add("Text",source[0],"Yehida");
UpdateCoptxtStatus.DataBindings.Add("Text",source[0],"Status");
UpdateCoptxtHomePhone.DataBindings.Add("Text",source[0],"HomePhone");
UpdateCoptxtCellPhone.DataBindings.Add("Text",source[0],"CellPhone");

And the RowFilter code:

source.RowFilter="(LastName + ' ' + FirstName)='"+SelectedCopName +"'";

Thanx! Yosi

Re: DataBind Issue

albCode28-Dec-05 2:35

albCode

28-Dec-05 2:35

. .
.
.
.
source.RowFilter="(LastName + ' ' + FirstName)='"+SelectedCopName +"'";
urdataview.RowStateFilter = DataViewRowState.ModifiedCurrent;

i am not so sure but hope helps???

Re: DataBind Issue NO LUCK

HolyGrandFather28-Dec-05 3:05

HolyGrandFather

28-Dec-05 3:05

nope.. when i try using it it throws an exception .
"index 0 is not negative and below total rows cund"
whenever he tries to bind it for example: UpdateCoptxtMa.DataBindings.Add("Text",source[0],"Ma");

i'm lookin for some way , to refresh the textBoxes, ReBInd them i dunno , a way to make them realize that the datasource has changed...!

thanks anyway..

Any other suggestions? please?

Re: DataBind Issue NO LUCK

albCode28-Dec-05 3:35

albCode

28-Dec-05 3:35

check this link

http://www.codeproject.com/cs/miscctrl/GridFilter.asp

How to disable close and resize button in c#.net application

Malayil alex28-Dec-05 0:41

Malayil alex

28-Dec-05 0:41

Hello,

I am C#.net programmer(beginner).I want to disable resize and close button in
my c#.net application.pls anybody help me.i am waiting

alex.
Thanks in advance.

Help Me

Re: How to disable close and resize button in c#.net application

albCode28-Dec-05 0:54

albCode

28-Dec-05 0:54

follow this link in the end page u got example in C#.

in load of form write this code
this.MaximizeBox =false;

http://addressof.com/blog/articles/232.aspx

Re: How to disable close and resize button in c#.net application

Luis Alonso Ramos28-Dec-05 5:56

Luis Alonso Ramos

28-Dec-05 5:56

In the designer, set the form's BorderSyle property to FormBorderStyle.FixedDialog, and set the ControlBox property to false.

I hope this helps,

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

The amount of sleep the average person needs is five more minutes. -- Vikram A Punathambekar, Aug. 11, 2005

Re: How to disable close and resize button in c#.net application

imsathy29-Dec-05 1:53

imsathy

29-Dec-05 1:53

add this.ControlBox = false; in the InitializeComponent() of ur app

sathy

help regarding redirecting consol I/O in c# app.

musmanafzal28-Dec-05 0:32

musmanafzal

28-Dec-05 0:32

sir i have to make a gui application in c# that will run a cosole application and will give inputcommands and receive output from that console application. i invoke the cmd.exe in c# using system.diagnostic.process.start() function now i need do pass commands to my process as well as receive output.
please give solution to it and list related namespaces to be used.

sherry; email : shaheryar011@gmail.com

-- modified at 5:32 Tuesday 27th December, 2005

sherry

Re: help regarding redirecting consol I/O in c# app.

Judah Gabriel Himango28-Dec-05 4:44

Judah Gabriel Himango

28-Dec-05 4:44

You don't need to start CMD.exe. Just start your Console app using System.Diagnostics.Process.Start. To intercept output or give input, you can use some methods of the Process class:

System.Diagnostics.Process proc = new System.Diagnostics.Process();
System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo("myConsoleApp.exe", "any arguments go here");
proc.StartInfo = startInfo;
proc.StandardInput.Write("I'm now inputting text to the console app!");
proc.StandardOutput.ReadLine(); // I just read the output of the app!

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Bought a House!
Judah Himango

How to disable SAVE,PRINT options in MS OFFICE using WINDOWS API's

pradpb99927-Dec-05 22:17

pradpb999

27-Dec-05 22:17

HI,

I want to disable the MS OFFICE File Menu options and Tollbar Buttons
by using WINDOWS API's..?

We can do this by using MS OFFICE libraries, but i want do using WINDOWS API's.

IS IT POSSIBLE..?

If so PLZ send reply to : pradpb999@gmail.com

pradeep kumar

Re: How to disable SAVE,PRINT options in MS OFFICE using WINDOWS API's

Judah Gabriel Himango28-Dec-05 4:32

Judah Gabriel Himango

28-Dec-05 4:32

Have you tried getting a handle to the menu items in question, then doing a SendMessage to hide it? I'd imagine this could work.

However, I question why anyone would want to do this; sounds either malicious or just a bad solution to a problem. What are you trying to do?

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Bought a House!
Judah Himango

Sockets

HakunaMatada27-Dec-05 22:11

HakunaMatada

27-Dec-05 22:11

How do I broadcast IP packets on the network using Windows Sockets?

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