Using Stretchblt Function In Vba?

Jan 8, 2010

I would like to save a copy of an image in a microsoft forms 2.0 image control to file. The saved image copy should be smaller in size and I would like to make either the width or the height in pixels a constant. I think I should be using stretchblt function from gdi32.dll but I do not know how to use it properly.


Rendering With Stretchblt From An Off Screen Form?

Aug 4, 2009

I am Using VS.NET 2008 VB - I am trying to render graphics from an off screen form or an invisble panel as comparison to as the previous version of VB (5.0,6.0) can use an invisible picture boxes to blt from. The problem that I am having that does not make much sense is that when the form is actually off the screen the blt returns nothing. Is there a new GDI+ operation that can copy from an invisible panel or picturebox or offscreen visble form or is there another low level api call that can be used to return what should be drawn on the off screen form or an invisble device context... Its a shame to see certain fetures of VB degrade. Like transparency and zorder. I would probably been done with my app if it werent for the setbacks. Can anyone offer any assitance? I do have it working correctly to display the transparency correctly but I am looking for a way to eliminate the flicker that is generated by setting the order and visiblit of the controls to render proper transparency...  An offscreen form with a panel with all the controls to endure the flicker while I copy the images that was captured during the rendering process after it is done changing the depth order and visiblity would make the most sense

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How To Pass A Function To A Function Is Functors/function Objects Avaiable In VB2010

Oct 12, 2011

I want to make an numerical integration method with takes in an analytic function and integrate it over a specific interval. For the numerical integration procedure I want to use some procedures in The problem is that these are programmed in C++ and they uses functors to pass a function to the integration method. How can I do this in VB 2010?

I want to initialize the function (i.e. set a=1,b=0 for function y(x)=a*x+b) and then pass the function to the integration method. Then when the integration method call the function it only calls the function with one parameter (i.e. x since a,b is already set)

What is the best way to do this in VB2010?I want to make a general integration method where I can pass any single valued function and integration limits.

I have just started using VB, and from what I have found so far it seems like the tools you have is

- to us a delegate for the function
- to use a lambda expression for the function
- send a pointer/adressOf
- to create a function class/structure and submit this to the function

As for now I am most inclined to create a function-class. But I am not really sure how.F.ex. I make different classes for each "uniqe function" I want to integrate, but how can I pass them to the integration function when I need to specify the argument type in the integration-function-call?This seems like a basic problem which applies to many Math operations, so I think it would be very useful to clarify this.

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Function Syntax - Call A Function With 2 Arguments When The Function Is Only Defined For One

Apr 1, 2010

I'm trying to undersatnd the syntax of calling a funciton and it seem confusing when I'm using a web service in Maybe this question should be in an ASP forum, but it is a VB question. This simple web service allows you to type in your name and it response with an alert box with you name.

My question is, How can you call a function with 2 arguments when the function is only defined for one.  I understand that the second argument is actually a method that handling the respons, but how can you interchange function arguments for methods and how do you know that there are methods for

Here's my call:

<script type="text/javascript">

function HelloWorld()

var yourName = $get('txtYourName').value;


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VS 2010 : Convert A DLL Function Call Which Has The Callback Function Routine Called Within The DLL Function Call?

May 25, 2012

I am trying to convert a DLL function call which has the Callback function routine called within the DLL function call.The DLL function call signature is like this:

typedef void *HANDLE;


how to convert this DLL call to VB.NET and also how to create the callback function and send it as parameter to this function

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Make Picturebox1(function Already Assigned) Perform The Same Function As Picturebox2(no Function Assigned)

Aug 1, 2009

i wanted to ask how to make picturebox1 ,to which functions are already assigned, perform the same function  as picturebox2 ,to which no functions are assigned.For example:I have already made picturebox1 and have assigned it alot of function like when play button is pressed then picturebox1.visible = true and when we press pause button picturebox1.visible = false. So now i decided to make a theme and have to remove the picturebox1 and want to allow the picturebox2 to havefunction of picturebox1.But when i disable the theme the function of picturebox1 should go back to picturebox1.

View 6 Replies View Related - Execute A Stored Function In Oracle Or Sql - Adding The Parameter Values Of The Function

Dec 13, 2011

I need to execute a stored function in oracle or sql through I created a command object. Depending on the database type(oracle or SQL) i am preparing the Command text as Select functionName(?,?,?,?,?,?,?,?) from dual; (For Oracle) Adding the parameter values of the function. Now performing the ExecuteScalar which is not working saying invalid parameter. This works with ODBC connection string. But ODBC doesn't with 64bit. My Requirement: Code should execute a user defined stored procedure by taking the values at runtime.

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Setting A Variable To Accept The Result Of A Function By Calling The Function With Many Parameters

Feb 17, 2011

I'm currently working with a client's VB.Net code, which was developed for them by a small development shop a few years ago and which they purchased and have been maintaining and uprgrading since. This client's primary developer is out on indefinite (likely permanent) medical leave and I'm now filling in until they bring in a full timer (as I'm a contractor here). My current task is to add some functionality to a the VB.Net code they purchased. I'm finding practices and techniques in the code that absolutely baffle me and can't make the code do what I want. I'm starting to wonder if it's me and was hoping to get some thoughts on the code I've encountered.

For example: Setting a variable to accept the result of a function by calling the function with many parameters, clearing the parameters in the function, setting them to some value, calling another function with those new values, then never using the values returned by the functions. I'll add a code snippet in the first comment since this is already getting long.

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VS 2008 Difference Of Sleep Function And Pause Function (using Timer) Between A Loop

Aug 20, 2009

Hi. what is the difference of sleep function and pause function (using timer) between a loop.

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C# - Function Or Interface Marked As Restricted Or The Function Uses An Automation Type Not Supported In Visual Basic?

Oct 19, 2010

What does this error mean in VB6? Function or interface marked as restricted, or the function uses an Automation type not supported in Visual Basic.

I keep getting it when i call a particular method of a dll that comes with windows xp and beyond (in system32 called upnp.dll)

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Call A Function From Inside Another And Suspend It Until The Called Function Is Finished

Jan 25, 2010

How can I call a function from inside another function and suspend the calling function until the called function is finished? I hope I can get some replies because I don't know how to ask the question and make sense:).

Anyway what I am trying to do in steps:

1. The user clicks button1 which triggers the click event.
2. From the click event I call a function
3. I then pop-up a form, that has instructions for the user to read.
4. After the user has read the form he will click the "Done" button and return to the calling function.

The problem is the the calling function continues to execute. I want to stop execution of the calling function until the users clicks the "Done" button on the instruction pop=up. I know I can use a msgbox but the instructions can be lengthly and does not look good in a msgbox.

I have tried the Call method with return in the "Done" button click but I can make that work. I also tried a goto statement but I can get that to work either. In the call statement I said call and it got there but as I said the calling function continued to execute.

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Getimage Of Control Function - Call This Function For Saving The Images?

Jan 30, 2010

ive two custom controls, which are used to draw and edit etc...(like paint but customized....) i want to save their images with a single click....So im using the Getimageofcontrol function to do it....its code is below:::

Public Function GetImageOfControl(ByVal c As Control) As Image
Dim rc As New Rectangle(c.PointToScreen(c.Location), c.Size)
Dim i As Image = New Bitmap(rc.Width, rc.Height)[code].....

and the code to call this function for saving the images is simply.. ...


but the problem is that both the images have the same content....

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Threaded Function Call Slower Than Calling Function Directly?

Sep 14, 2010

I have a function where I am performing a lot number of database operations inside a Sub. The operation when called directly like:ExecProcess()

takes about 11 seconds to run.However, if I create a Delegate, and call the sub using BeginInvoke(), the very same process takes over 40 seconds to execute.Here's the threaded code:

Protected del As ProcessDelegate
Protected Delegate Sub ProcessDelegate()
del = New ProcessDelegate(AddressOf SELocal.ExecJob)
Dim cb As New AsyncCallback(AddressOf Me.ExecJobComplete)
del.BeginInvoke(cb, del)

Anyone know what may cause a function to take longer inside a new thread, rather than calling directly?

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Algorithm String - Function Encrypt And Function Decrypt ?

Jun 13, 2011

I have 1 string : abc @#ABC.xyz123ZYX

Now I need to encode the string:

The encoding alphabetic characters,


With this string, after encoding, the result is: zyx @#ZYX.cba123ABC

About Function Encrypt and Function Decrypt?

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Calculation Function - Takes The Average (which Is Calculated By A Different Function)

May 24, 2011

To have a function that takes the average (which is calculated by a different function) say for example the average is 6, now the function is to take the number 6 and get the variance from six to another number lets say its 12 so this will return a calculation of 50% variance. now here comes the issue, i have it calculating the variance how ever lets say that there is a score that is 0, how can i make it calculate the variance without taking count for that 0? i guess you can say i need it to "skip" if its a 0.

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Call A Function / String That It Uses Will Be Given To Function To Initiate A Download?

Aug 21, 2009

Some programs implement command parameters, Like my favourite computer game - Crysis - has them and windows media player has them.But how could i implement them in VB.NET..I want to have a component of my program built as a seperate exe - so it can be an Optional component.But of course the seperate exe, on load, needs data passing to it.So i need something like Process.start("Componentname.exe", "/StartDL <Suchandsuchastring>)/StartDL will need to call a function, and the string that it uses will be given to the function to initiate a download?

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Does Subroutine Called By A Function Have To Finish For Function To Proceed

Jun 5, 2011

If a subroutine is called within a function, does the function always wait until that subroutine is completely finished before it will proceed with the rest of the function? If so, is there any way to make it not wait and continue on with the rest of function and not care what happens in the subroutine?

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Override A Function And Call A Function With The Same Name From The Grandparent Superclass?

Sep 6, 2010

I am attempting to inherit an ASP.NET RegularExpressionValidator and add some functionality to it. I inherited the control and added my custom properties. However, I would also like the client-side functionality to call a different JavaScript function.

In order to do that, I will need to supress what is happening in the AddAttributesToRender method because the name of the function is hard-coded there. Here is what comes up in Reflector for the AddAttributesToRender function in RegularExpressionValidator:


Note: I tried to add the expando property before the parent class does to see if the code would check for its existence and skip it, but that just causes an exception.

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Pass Function (Of TElement / TKey) As A Function Parameter

May 28, 2012

I want to make a GetAllContacts method which takes a sort parameter of type Func(Of Contact, TKey) which is the same type that the OrderBy method for an IEnumerable(Of Contact) takes.[code]"Too many arguments to extension method 'Public Function ElementAtOrDefault(index As Integer) As Contact' defined in 'System.Linq.Enumerable'." on the second parameter.

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VS 2008 What Will Happen When 3 Function Calls Same Function At A Time

Apr 27, 2009

What will happen when 3 function calls same function at a time? I have 3 Function, f1,f2,f3.. Those function after completing their task will call finish() function. What will happen if Finish is Called morethan once..

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VS 2010 - Calling A Function - BackOrdered Function Of Program

Mar 30, 2012

I am having a problem with the BackOrdered Function of my program. I can`t get it to say anything but 0 when I run the program. Another problem I am having is the input box pops up like 6 times and it`s only suppose to once. [Code]

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[Public Sub / Public Function] Equals [Sub / Function] Declaring A Function Or Sub?

Jun 12, 2011

I want to know what implies to declare a function or a sub using public or directly Sub / Function i.e.:

Public Function Whatever()
' Process
End Function


Function Whatever()
' Process
End Function

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Call A Tsql Function Inside A Function?

Mar 23, 2011

I arrive from years with Oracle plsql. Now I'm trying I created a function that return a char value, so written:


The question: I will create a function get_type(...) in that calls the tsql function written above... how can I call the tsql function [abc].[GET_PERSON_TYPE] in function get_type(...) function?

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Execute VB Code Behind Function Before Javascript Function?

Jun 14, 2012

Possible Duplicate:

calling ASP function from javascript
okay running this code :
<script type="text/javascript">


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Return An (Anonymous Type With A Function) From A Function?

Mar 3, 2011

Just so it's known, this question is mostly academic, even though I tried to use the concept in a real-world solution. I realize the example is contrived, but I believe the concept is valid.I want to write some fluent code like this:


I realize that I can't force an anonymous type into a specific type (like implementing an interface or some other class), and I don't want the overhead of defining a specific class just to match my desired fluent name with the actual method name. So I was able to make the code work like this:

copy(my_first_file).to.Invoke(my_second_file)So there is no IntelliSense or type awareness there, and I have to include the Invoke in order to have the method run. How can I get more type safety and exclude the Invoke method, under these constraints: Anonymous Type returned from Method No additional classes or interfaces Preferably, I do not want to pass in another parameter to the copy() method that tells what type to return, unless copy becomes a generic method (but I think that means defining another class/interface, which I don't want to do)

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Make A Function Called "checkLogon" That Checks The Username/password Text To A Variable In That Function?

Oct 22, 2009

I've got a basic logon form where if you enter the right password/username, it redirects you to the "MainMenu" Form How can I make a function called "checkLogon" that checks the username/password text to a variable in that function?

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Add A Zoom Function And A Pan Function To A Picturebox?

May 1, 2010

I want to Use Picturebox_MouseCaptureChange Event Arg to zoom in on a peice of a PictureBox.Image. The Help Search says there is a zoom and a pan function on Systems.Windows.Controls But I cannot find it in the add reference component of the Visual Basic 2008 edition...I have one program that I did that allowed me to zoom using a TrackBar here it is...


The problem is that I cannot get the trackbar to zoom any closer that the top left side of the controler....I need to zoom and then pan around the image.

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Make New Function And Function Eror?

Dec 12, 2009

Heres my code

Public Class Encryption
Private _cipherEngine As New Cipher
#Region " PassEncryption "


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Nov 20, 2009

Can someone explain to me what the difference is between a recursive function and a factorial function. I know that a factorial function returns the product of all the numbers from 1 to itself. But how does that differ from what a recursive function does

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Use A While Loop And MID$ Function Instead Of The Split Function?

Dec 30, 2011

How do i use a while loop and MID$ function instead of the split function?

i'm trying to have the input (textbox) compared to a list(array) in a text document

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VS 2005 Write This Function Without Using Log Function?

Jul 31, 2010

I have Ln in my function that I write in excel but in vb it doesn't work


it should return the value = 0.573

how can I write this function without using log function (I don't know logs functions)

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Difference Between Public Sub And Private Sub And Private Function And Public Function And Sub And Shared Function?

May 31, 2011

explain me the difference between them? I'm new to visual basic, and I need to know the very basic things in Visual Basic allowing me to become a professional User

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C# - "Like" Function In A Dataset Stored In Memory ( The Same As Like Function In SQL )?

Aug 7, 2009

Assume I have a large dataset and I want to run a "like" function in the dataset eg column - NameIs there any way to run a like statement in a dataset.

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In .net, If A Function Returns An Object, Is It Wrong To Just Use The Function, _as_ An Object

Apr 30, 2009

I've got a f(x) that returns a collection of user controls. .Net lets me just treat the f(x) name as the collection.

Private Function GetCcB() As Collection(Of Reports_ucColumn)
Dim cc As New Collection(Of Reports_ucColumn)


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Write A Function As "Function DeleteIfExist(strFileName)"

Apr 25, 2009

i need code to write a function  DeleteIfExist(StrFileName)

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Call Function From Function?

May 26, 2011

Environment : VS2005 SP1
Protected Sub BILL_AMTTextBox_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs)
Dim adapter As SqlDataAdapter

I want to do something like as it is bold part in code. This is giving error.

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VS 2008 Using A New Function With A Function?

Dec 7, 2009

Im trying to make cipher the password before salting and hashing but when i try to call cipher it flags me on trying to change public to shared

class name : PassEn
Private _shiftCount As Integer
Public Property ShiftCount() As Integer


View 5 Replies View Related - "Inline" Function Call: Function Is Never Hit

Apr 19, 2010

I'm trying to make a tabbed menu for the website I'm working on. One of the pre-requisite is obviously to color the current tab differently, so the user can know on which tab is currently is.

To do this, I made this method in my code-behind:

Protected Function GetCssClass(ByVal ctrl As LinkButton) As String
If ctrl.ID = currentLink Then
Return "current"


The problem is now that the click event is not always fired. On first click, nothing happens, but on second click on a tab, the click event is correctly triggered.

Edit3: Could it be that the value stored in the hidden field is reset each time the masterpage is reloaded (I mean, each link points to a couple masterpage + content page) ?

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Function That Works Like The Php Function "htmlentities"?

Aug 8, 2009

In VB 2005 .Net is there a function that works like the php function "htmlentities"?

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Pass A Value From A Sub Procedure To A Function Procedure .... Pass The Whole Subprocedure To The Function Procedure Argument?

Mar 30, 2012

Im a student doing an assignment, how do i pass the value from a sub procedure to a function procedure....i want to pass the value from decSubtotal to a function procedure named CalculateDiscount; check out my code--


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