Resize Vector In Program - Allocate Memory
Sep 13, 2010
I have a program in C++, that is doing some calculations. I use a vector in C++ and resize the vector in the program, in order to conserve and allocate memory. Can you allocate memory in vb.net? So if my user inputs 1000, I want an array/vector to have a size of 1000. Can I change the size of the vector in the program? And is there a difference between container types in vb.net, I was just assuming
Dim xx(1 to 1000) as double, is the standard way of declaring.
And resize xx(1 to N) would be the way to resize.
I am using visual studio 2008 express.
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Jan 4, 2012
does visual basic have any function to allocate a memory by specfying the size of it? I just want to experiment with it, like see what happens when i allocate 2GB of memory on my p3 MHz 512MB ram box =) I know obviously it will crash or have high page file access.
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Aug 21, 2009
I have resorted to using the Win32 API calls VirtualAlloc/VirtualFree to allocate and release memory blocks greater than 2GB in size.
I should be able to use the AllocHGlobal function from the System.Runtime.InteropServices.Marshal class to do the same.
However, the following code gives an arithmetic overflow exception (note the explicit cast to long which should instance a 64 bit pointer).
Dim p As IntPtr = System.Runtime.InteropServices.Marshal.AllocHGlobal(New IntPtr(CLng(3221225472)))
System.Runtime.InteropServices.Marshal.FreeHGlobal(p)
So my question is, Can I use AllocHGlobal to allocate more than 2GB of memory?
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Feb 11, 2012
Once i allocate arrays is the memory allocated for them immediatlyy or once i add data to the array? like say i create an integer with 400 million arrays (lol) would visual basic allocate memory immediately for each of the 400 million arrays or once there is data allocated to one of the 400 million arrays, say when i put the number 4 in the 100th array.
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Nov 17, 2011
I have a camera in my 3D game. I have a start vector and and end vector for its positioning. I am wanting to move it smoothly from the first vector to the end vector.
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Sep 15, 2009
I'm searching for a solution to resize image(jpg) being passed in from an array in Picturebox Control on .NETCF 2.0 in VB.NET without resorting to using the opennetcf library, is it possible?
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Apr 18, 2012
I am trying to connect to an online database using the following code:
Imports System.IO
Imports System.Data.SqlClient
Public Class frmMain
[Code]....
It gives me the following error:
Could not allocate a new page for database 'databasename' because of insufficient disk space in filegroup 'PRIMARY'. Create the necessary space by dropping objects in the filegroup, adding additional files to the filegroup, or setting autogrowth on for existing files in the filegroup.
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Mar 10, 2012
I am currently trying to allocate a number of group boxes dynamically. Previously (in other languages) when I have carried out something like this I have used the '&' to substitute the contents of the variable direct into the code I.E
For I = 1 to 20
Groupboxname = "GroupBox"+I
Weatherstates.&groupbox.controlls.add(obutton)
next
This would then have the result of creating a button in all the group boxes, however this does not appear to work in VB .net 2010
I have looked at Directcast, but i am a even more confused. Is there a simple way to substitute the contents of a variable into the code ?
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Feb 20, 2010
A friend and I are working on a project where we're required to build a reliable UDPclient/server using VB.Net. We have things working well, but one thing that still eludes us is how to dynamically allocate a (byte) buffer for the incoming data. Right now we have to hard code a maximum value/MTU (or use a really large buffer size and resize it once we've finished receiving). Does anyone know of a way that this can be done without needing to specify the receive buffer size?
Basically, before calling the receive function on the socket with a buffer of size x, we want to know x so we can allocate an appropriately sized buffer. Perhaps this is a problem in all socket programing that you just have to deal with??
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Jan 27, 2010
I'd like to make a simple VB utility to resize images using vb.net. I am having trouble figuring out what vb class to use to actually manipulate the images. The Image class and the Bitmap class don't work.
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Jan 20, 2011
I need to loop through a very large collection of images and resize them all to 400x600 pixels. Is this possible?
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May 14, 2010
I have found how to create a metafile using graphics but I can't save it to a vector file. I tried the Metafile.Save("*.emf") function but when I insert the image into PPT, it appear to be a bitmap when I enlarge it.
Here are the code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Using gRef As Graphics = Me.CreateGraphics
Dim hdc = gRef.GetHdc()
[code]....
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Sep 21, 2009
Can I get an example of how to make something like a Vector or an ArrayList in Visual Basic .NET?
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Aug 24, 2009
I got the start function, but know i wanna resize the program i am gonna make it start
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
System.Diagnostics.Process.Start("C:GAMENAMEgamename.exe")
End Sub
How to add to that code and make it so it makes C:GAMENAMEgamename.exe start as windows size?
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Nov 15, 2011
I am wanting to create a rectangle for two points (vector). I need a function that takes two points and a length and calculates a perpendicular point from line (vector) AB, to a given length.
I found this code, however it doesn't seem to work.
[Code]...
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May 20, 2009
is it possible to save inkstrokes in a format that is something like a vector typein order to be able to keep its features independetly of its magnification?
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Feb 15, 2010
Is it possible to insert vector images (ecw or ai) in an VB.NET application? If so...is it possible to zoom in on them and keep the same precision? I'm trying to create a very basic GIS system and I need to zoom in on some places.
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Nov 5, 2010
Have some vector graphic files stored as hex strings, I ahve now idea how to go about displaying these as graphics,
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May 5, 2011
I need to write a simple program that imports tab delimited x,y coordinates into a simple form, by clicking an "Import" button and navigating to the particular .txt file. On the button press I want to read the text file and display these in the shape of anything from a simple square to a slightly more complex closed polygon (maybe using a path function) in the main picture box to view the shape.
Then I would like to press an "Export" button and save the displayed shape coordinates/vertices back to a file location of my choice as a .txt file.
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Jan 20, 2009
the program ive created will need to run for 3-7 days with out be restarted.im worried about memory leaks and anything else that might occur. to view what my program is using ive opened windows task manager.these are the reading i get:
CPU: between 0 and 2
working set(memory) about 29,596 - 29,600k
memory(private working set) about 8756 k[code]....
2 question, first does this look ok (is my program using to much memory, etc) and secondly why does the thread say 12-14?i thought the program is one thread plus i have a second thread running in the background so shouldnt that be just 2 then?(the program is an sms sender.it sends and recieves sms's, databases them, and sends out responses based on what the txt msg is).
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Nov 4, 2011
suppose i have a tree that have a root node. that root node have 3 child nodes. each child node have 3 child nodes and so on say up to level 4. if i number each node from the root node and numbering from left to right, the root node being number 1 and the left child of the root being number 2, the middle child of the root being number 3 and the right being number 3. on the third level the left child node of the left child node of the root being number 5 and so on. if i have numbers 1 up to 13 and want to put each number into a node numbered the same i.e number 1 gets into the root node, number 2 gets into the left child node of the root and so on. how would i achieve that.
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Dec 7, 2011
I am working on a project where my forms resize to fill the users screen (which means they have different dimensions depending on screen resolution).I have made some vector images (.eps) in hopes of using them on my forms so that when the form opens the images always look clear, crisp, and not skewed.I am finding that vb.net will not let me import a .eps file into my resources. Is there a way around this? Is there another way to get a vector image into vb? possibly an SDK that will allow me to work with .eps files the same way i work with .dcm images?
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Jul 16, 2011
How do I go about generating a random vector coordinate that is within say 200 units of another vector coordinate?
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Jul 11, 2009
This is a little app that sits in your task bar and check a website for the presence of a simple string. The string is either "ONLINE" or "OFFLINE". THe problem is that there seems to be a minor memory leak, since every once in a while (I suppose when the timer expires) the memory it takes up increases by a good bit. [code]
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Aug 16, 2011
1. I run a program in VB, then i click X button to close the main form, the program exits.
2. Then I change the code slightly (for example I add MsgBox("abc") and try to run the program.
3. An error appers: "The operation could not be completed..." and then some text in my own language, I try to translate it into english: "...The process cant get access to file, because its been in use by another process"
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Oct 3, 2009
I am looking for tools that will enable me to search and manipulate pdf files and pdf vector graphics. I want to search a pdf image/file for specific content and then manipulate the image. Are there any known resources out there? I have looked at the documentation on the Adobe web site, but I don't know where to begin. I'm looking for books or a forum where I can get specific information and examples.
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Oct 21, 2011
Just wondering how if it is possible to draw onto something, with GDI+, that can then be saved to some kind of vector format?
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Apr 26, 2012
I created so many listviews in my project, that im too lazy to add to each listview a resize event with percentages. Is there any other trick, who just scales the columns so as they are?
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Jan 10, 2012
I'm starting work updating an UI for one of my company's applications and I'm running into a sticky issue. The parent control contains several panels, each of which can be turned on or off depending on user input.
The final panel in the user control contains another user control which gets resizes according to a toggle switch. Essentially, it "opens" up more information.
While the child control (ChildControl) is docked to Fill inside the parent control (ParentControl), when I add height to ChildControl I can't get ParentControl's height to get updated as well. Currently I'm handling the ChildControl.Layout event in ParentControl but I can't seem to reach that code. To resize ChildControl, I'm calling Me.Height += 200 in ChildControl.vb.
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Jun 3, 2011
I made a little VB app to shutdown a laptop after it has been powered on for 2 1/2 hours, and giving the user a little over 8min warning that it is about to be shutdown. However I have nothing in place to stop the user from restarting the device once it is shutdown. What I would like to integrate in this, is a sort of memory where if the user doesn't wait at least 30 minutes, the shutdwon will re-iniate immediatly.
I included the code I did so far.
Public Class Form1
Private Declare Sub Sleep Lib "kernel32" (ByVal dwmilliseconds As Long)
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
[Code].....
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