Most Efficient Method To See If Alpha Channel Is Used In A 32 Bit Bitmap?

Mar 18, 2011

url...But what I'm looking for is just see if any alpha (0-254) is used in at least one of the pixels. Would the Bitmap.Lockbits and BitmapData method be the most efficient (speedy?) or is there another way. I've tried toying around with ColorPalette and the Alpha flag, but never could figure it out (and even if it is a way to check to see if the alpha channel is used at all).


Retaining Alpha Channel On Buttons In Outlook Toolbar

Aug 28, 2009

I am developing a COM Add-in using VB.NET in Visual Studio 2008 Pro for Outlook 2003 and am having trouble assigning images to custom toolbar buttons. In a nutshell, I am having to convert from an Icon type to a stdole.IPictureDisp type so that I can assign my buttons a picture. The picture displays, but it loses the Alpha channel and the background is no longer transparent. I can verify that before the conversion to IPictureDisp object, that the PixelFormat property is set to Format32bppArgb (2498570). I am using a coding technique suggested here:[URL]. For C# users, this link [URL] shows how to modify the IPictureDisp one pixel at a time and rebuild the transparency, but I can't find similar functions in VB.NET...

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Gdi - Trasparent Control - Import A Png With Alpha Channel And Random Shape

Mar 25, 2010


i have created a control as above, this control allows me to import a png with alpha channel and random shape. and then it can display on top of any other control, i.e. textbox, picturebox,etc. and the background should always show what right under it, instead of just show its parent control. it worked if it's static mode, ie stand still in the form. but when i tried to drag/move it, the control wouldn't render itself properly,and also goes underneath other controls.

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Way To Manipulate Alpha Values In A Bitmap?

Aug 14, 2011

This is a follow on from a recent thread

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Overlay Text, Bitmap With Diff Effects (alpha) Using DX?

Feb 6, 2011

I need to overlay the text, a movie or bitmap over a video.It would be possible to use VMR9 filters, but at playing of a wide video, for limits of a black square, it is impossible to overlay in out of video square range.

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What Is The Most Efficient Method For Looping Through A SortedList In VB 2008

Oct 29, 2009

The code below shows me (I think) that the "for each" loop is about 10% faster than the "i to n" loop, but the "for each" loop creates 567k in new memory? Is this right? Which way is generally most efficient with regards to speed and memory usage? If you want to run this code in VB just add a button and 2 labels to a form.


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.net - Know If PNG Has An Alpha (or If The Alpha Is Completely White)?

Jan 13, 2010

I have PNG and need to know if it has an alpha (or if the alpha is completely white)? How can I accomplish this in code.

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OutOfMemoryException On Bitmap.Clone Method?

Mar 23, 2010

Are there other conditions that can cause this exception to be raised? I am attempting to use the method to take a section of the source bitmap in question (possibly equal to the entire source bitmap). I have checked my code extensively, including verifying the parameters of the Rectangle at runtime, and even tried hard-coding a Rectangle with parameters that I knew were within the bounds of the source bitmap, but have still received the error. I tried several choices for the PixelFormat as well.

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Why Does One Method Of Declaring A Bitmap Work And The Other Doesn't

May 27, 2009

I can't figure this out. I have a bitmap that will be used throughout an application, so I can't declare it with a Dim statement in a procedure, or it isn't recognized as having been declared in other procedures. So I declared it at the top of the form class, two ways. This one works: Private MyBitmap As New Bitmap(622, 461) It makes a bitmap to the exact size of a picturebox I have. But I want to be able to change the size of the picturebox and not have to worry about going back into this declaration to set things up, every time I decide to change the box's dimensions. So I tried this next version, but it doesn't work:


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System Memory In Bitmap - Using Bitmap To Show Picture Box Like Slideshow Using Timer

Jul 3, 2011

I'm using Bitmap to show picture box like slideshow using Timer. For each timer interval, I've to go for new instance of Bitmap, there System memory increases to 1MB, How to resolve this, 'BG is picture box

 Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tic  Dim img As Bitmap

img = New Bitmap(System.Drawing.Bitmap.FromFile(FileIO.FileSystem.GetFiles


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Use A ToolTip Directly To A Bitmap Object (System.Drawing.Bitmap)?

Dec 15, 2010

I'm trying to use a ToolTip directly to a Bitmap Object (System.Drawing.Bitmap), aparently I can't do this because Bitmap isnt a Windows Control.

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Create Monochrome Bitmap From Semi Transparent Bitmap?

Sep 17, 2011

how can i create a monochrome bitmap from a semi transparent bitmap in the bmp is for a transparency mask image for an icon i'm trying to create with the CreateIconIndirect API function.

i'm using vb2008 .Net3.5, but i would prefer an answer that would also work in vb2005

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Using WCF Peer Channel?

Mar 9, 2012

I am architecting a program that I need some help on.  I need to have a "watcher" program that will sit on a server and monitor a SQL Server.  At configured intervals, the watcher will run a query on the server and create a dataset of information I want to share to any clients that are listening.  I am looking at WCF Peer channel but all I can see is peer to peer chat and most of the examples I have seen are partial examples.  I have looked at the example program from Microsoft but I am still a bit confused.  The listener programs will receive the dataset of values from the watcher and filter the data at the local level and display the data they need and display it to the end user.  I don't know if a TCP client/server would be a better solution, but the dataset may contain up to 10,000 rows of data.  From what I read the WCF Peer channel will transmit at 50 mbps and should handle this load.  My other option is a server/client architecture using TCP spawning a new thread for each request.  Does anyone have any good examples, or articles about WCF and VB that they can point me to?

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4 Channel ADC Output To 4 Textboxes?

Jan 27, 2010

I've got a micro controller with 4 channel ADC that I want to make a program for. It will be for data logging. I want to take each channel and display it in 4 textboxes to begin with.Later I like to do some conversions of the data to show temperature , use a lookup table and a few other things in each of these boxes, but at first I'd just like to concentrate on getting the data split into each box.The chip output is 8 bytes . The first two are the channel select and the next two is the data. Output of the chip is in ASCII. I don't want to send to the chip, just receive.If I view the output in decimal I get 1xx 2xx 3xx 4xx (xx being the data to display).

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C# - WCF, Channel Factory, And Exceptions?

Feb 2, 2010

Using vs2008,, C#, fw 3.5

I am consuming my service in my client

Service is hosted in IIS

Client(winforms MDI) is generated using svcutil using /l, /r, /ct, & /n switches

Service and client both use a MyEntities.dll

I am using nettcp with TransportWithMessageCredential. I cache the proxy in the main form

if Membership.ValidateUser(UsernameTextBox.Text, PasswordTextBox.Text)
_proxy = new MyServiceClient
_proxy.ClientCredentials.UserName.UserName = "username"[code].....

Could I subscribe to the _proxy.InnerChannel.Faulted and do that clean up there?

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Play Audio In One Channel?

Nov 12, 2011

I want to play a sound in the left speaker only and then again in the right speaker.

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Extraxct A Rectangle Bitmap From A Big Bitmap?

May 26, 2011

Here is a short program to demonstrate my question. I just want to extraxct a rectangle bitmap from a big bitmap.Code as follows:

Sub Button3_Click(ByVal sender
As System.Object,[code]....

Execution stops when hitting the Dim cloneBitmap statement, which should have created a bitmap out of the rectangle cut out.The message is:

"MissingMemeberException was unhandled.

No default member was found for type 'bitmap"

I just don't get it. Seems that the method Clone(Rectangle, PixelFormat was not found.

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Parameter Is Not Valid - Bitmap Bmp = New Bitmap()

Feb 10, 2010

I have a grass image located here in my directory. I want to just create a Bitmap, but I am getting an error. (Parameter is not valid.) Immediate Window: A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll


private void Form1_Load(object sender, EventArgs e)
Bitmap bmp = new Bitmap("grass.jpg");

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Access Wcf Service By A Client Using Channel Factory?

May 6, 2011

I tried this one...but its not working.[code]...

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Oct 20, 2010

Our core server is calling out to a soap web service over https on a number of different servers to confirm that a transaction has completed.The code is dotnet 3.5 (vb) and works for the various callback services we have set up until we just moved a new one into production and it is refusing to communicate, giving the following error:Unhandled Exception: System.ServiceModel.Security.SecurityNegotiationException:Could not establish secure channel for SSL/TLS with authority -> System.Net.WebException: The request washe case here.

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Could Not Establish Trust Relationship For SSL / TLS Secure Channel

Sep 22, 2009

I am new to ssl. I am trying to Post some data to OWA using httpwebrequest class using following code.
Dim post As Stream
post = web1.GetRequestStream
post.Write(data, 0, data.Length)
But when I try to get request stream to submit data using above code.(JUST PART OF CODE).i get following error. The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.

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Could Not Establish Trust Relationship For The SSL / TLS Secure Channel

Jun 13, 2011

here is my code


my problem is how can i pass the SSL certificate cause im using https in my request,

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Could Not Establish Trust Relationship For The SSL/TLS Secure Channel

Sep 20, 2009

i am trying to Post some data to OWA using httpwebrequest class.

Dim post As Stream
post = web1.GetRequestStream
post.Write(data, 0, data.Length)

but when i try to get request stream to submit data using above code.(JUST PART OF CODE).i get following error.The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.

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Visual Studio 2010 And .Net Framework 4.0 Training Course On Channel 9?

Aug 27, 2010

See this site for details.>>[URL]..

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Get The Loudness Of The Current Sound Coming From The Master Audio Channel?

Nov 10, 2011

I would like to create a visualizer for the windows system audio. I'm looking for a way to sample the loudness of the sound currently being played. I don't need the actual sound unless required for computing the sound levels. My goal is to create something similar to the bouncing green level found on windows 7's volume control.

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Whats The Bare Minimal Need To Connect To A Irc Server Then Join The Channel

Aug 4, 2010

Whats the bare minimal you need to connect to a irc server then join the channel? vb6 use to use winsock whats equilivent?

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Strongly-typed Generic Method Invokes Its Argument's Base Class Method Instead Of A Shadowed Method In T?

Oct 19, 2010

Consider a MyForm class that contains a shadowed implementation of Show(). It also contains a CreateForm() method, which accepts an instance of the form and calls the shadowed sub:


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Create A Timer Control For Each Channel With Combo Boxes For Days / Hours / Minutes / Radiobuttons For AM Or PM

Mar 11, 2012

I have an I/O device with 8 channels. I want to create a timer control for each channel with combo boxes for days, hours, minutes and radiobuttons for AM or PM. This is a crude (and not working) example of what I need:[code]

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'With ... End With' Really More Efficient?

Nov 4, 2010

It seems that when using With blocks in VB.NET, the resulting MSIL larger than w/o. So this leads me to ask, are With Blocks really more efficient? MSIL is what gets JITed into native machine code, so smaller code size should imply more efficient code, right?


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Efficient Way To Add Validation ?

May 4, 2010

Where to add this validation, or if there is a more efficient way of doing it and where to put it?


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Get Alpha Value From ARGB?

Feb 11, 2010

1: Start with bitmap in picturebox colored white2: Draw a filled rectangle (50,50,100, 100) Color black - ARGB (255,0,0,0)3: Draw a filled rectangle covering black rectangle (25,25,150, 150) Color blue, with Alpha set to 100 - ARGB (100,0,0,255) -because of 100 Alpha setting the black rectangle is visible through the blue rectangleProblem : Using bitmap.GetPixel on the blue rectangle (over white background) the result is ARGB(255,155,155,255) -an Alpha value of 255. The new color loooks the same but is not transparent.Question: How to find Alpha(transparency) value of pixel

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How To Use MVC Pattern Efficient

Aug 9, 2009

How to use MVC Pattern efficient?

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More Efficient For Each Loops?

Jul 26, 2011

Is there a more efficient way of doing this code?

For Each row As DataRow In dt.Rows
Dim ts1 As String = row(0).ToString
For index As Integer = 1 To 9[code]....

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Which Sort Is More Efficient?

Aug 26, 2011

just wondering which of these two sort methods would be more efficient movies.OrderBy(Function(m As Movie) m.Title)


View 1 Replies View Related - Which Function Is Faster And Efficient?

Jan 5, 2010

I need to verify if a certain user exist on my site.I want to know if which of these two functions is more efficient, faster and better compared to each other and why.


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C# - Efficient Data Conversion Using .Net

Aug 1, 2009

I am working on an application that will need to read tons of records (close to 500,000) from one table and insert them into another set of tables in the same database. I though about using SSIS package for this but our DBAs don't want to use that. Now, I am thinking of a multi-threaded approach. I am thinking that I can have a few thread started that will read say (500) records at a time and insert them, then come back and read more.

Now, say I spawn off 3 threads of this application. The first thread reads 500 rows and starts processing them. Can I lock these rows that were already read so that the next thread does not pick them up? I am trying to find some articles regarding this on the internet, but perhaps I am not searching for the correct terms in Google.

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Efficient Way To Sample Data?

Jul 1, 2010

I'd like to sample the data from the Arduino @ roughly 200Hz. Is there a more efficient way to do this than using a timer (which is what I am currently using)? Currently I am using[code]....

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How To Strip A String Of All Alpha's

May 26, 2011

Dim phoneNumber As String = "077 47578 587(num)"How do i strip the above string off every character which isnt a number. So only the numbers are left and then check to make sure it is 11 characters long?

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Is It More Efficient To Use UInteger Instead Of Integer

Nov 7, 2009

if there is no need for my variable to store negative values, is it more efficient to use UInteger instead of Integer? both are 4bytes and i've got a feeling unsigned works faster though i'm nt sure about it. note that the range of my variable is 0 to 2147483647, hence i could use a UInt32 or Int32 and both would give me the same result so i'm wondering about optimum performance.

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More Efficient Way To Create 1 MB File?

Jun 22, 2010

I have been reading books trying to learn .net on my own. I am working on an exercise that asks me to create a 1MB file. what i have below does work, but it seems to me there would be a more efficeient way. It seems like what i am doing would cause a lot of overhead. making a 1MB file easier than what i have?[code]...

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