In VB 2005, I am calling a C++ DLL function that returns the address in memory and size in bytes of a jpeg image. How can I load that jpeg image directly from memory into a picture box in my VB form? I cannot afford to save it to disk first.
View 10 RepliesI want to know if I can directly read or write values in the current process in a Visual Basic 2005 Windows application. Like *(DWORD*)(0x123456) = 1; in C++ will write the value 1 at the address 0x123456. So anyway to do the same in VB using only built in functions and not using ReadProcessMemory and WriteProcessMemory?
View 1 RepliesI have some questions about bitmaps and such. I am using the IDXSurfaceFactory::LoadImage Method to load an image and now I want to access its memory buffer, so I can do some direct memory manipulation and copy the content to another buffer afterwards (no BitBlit!). I managed to successfully use LoadImage, but I have no idea how to retrieve the pointer to the memory buffer and other informations. I want to basically know everything about, how and where the image is stored in the memory buffer.
Does windows always load images as BGR regardless of its original format? if not, how can I find out if the loaded image is stored as BGR or RGB. How can I find out how many bits each color has? How can I find out if the image is stored y-reversed? And if you load an indexed png for example, with one color marked as transparent, how can I find out which color is used for transparency?
I am trying to programitally download a file from a https server, that uses cookies (and hence I'm using httpwebrequest). I'm debug printing the capacity of the streams to check, but the output [raw] files look different. Have tried other encoding to no avail.
Code:
Sub downloadzip(strURL As String, strDestDir As String)
Dim request As HttpWebRequest
Dim response As HttpWebResponse
request = Net.HttpWebRequest.Create(strURL)
request.UserAgent = strUserAgent
[Code].....
So I get the right size file downloaded, but dotnetzip does not recognise it, and the files that get copied out are incomplete/invalid zips.
When im using this code, i encounter an "Out of Memory" error;
If System.IO.File.Exists("C: est.jpg") = True Then
Dim fs As New IO.FileStream("C: est.jpg", IO.FileMode.Open, IO.FileAccess.Read)
PictureBox1.Image = Image.FromStream(fs)
[Code].....
I have a small VB program written using VB Express 2008Part of it uses an Access database this all works fine using the custom classes.I want to extend it to use some parameterised settings which I have stored in a table in the same Access database .I want to load these parameters from the table at program startup, then use them later in the code as needed.In SQL I want to execute :-select parameter, parameter_value from system_ parametersthen store this in an array which I want to index on the parameter column/elementAny suggestions on how I can load this data into the array ?
View 1 RepliesI'm using the ShockwaveFlash ActiveX control in a VB.NET Windows Forms application and i'm wondering.Is it possible to load an SWF file into the ShockwaveFlash ActiveX object from a memory stream rather then from a file name?
I've noticed that the ActiveX object has such properties as "InlineData" and "MovieData", possibly these could be used.
I've also noticed someone has used Windows Messaging to send a pointer to a stream to the ActiveX control, has anyone seen this done?
Im getting a problem with one of my programs I have made in visual basic.NET where it gives me a memory error when i debug the program in the IDE. the exact error is this: "Attempted to read or write protected memory. This is often an indication that other memory is corrupt". My program basically has a few forms with text fields on that get their text values from an access database on the same hard drive. Im wondering if im doing something wrong because my program just seems to eat up memory whenever it does anything. For example I have one form that has a combobox on it and when you change the drop down list selection it retreives a few strings from the database and puts them into the relevant text boxes, if you keep changing the selection then the memory usage (in task manager) just keeps going up and up. occasionally I get the error mentioned above when debugging but in my built version of the program it throws an exception everytime the memory usage gets past 49K.
Also I noticed when debugging in the "immediate window" frame I get the following message often:A first chance exception of type 'System. Invalid OperationException' occurred in System.Data.dll...Do I need to somehow be "releasing" the memory that is used to gather data once it becomes redundant?
I am using the following code
This error occurs :
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Public Class FormRegEnumValue
[CODE]......................
QuoteSystem.AccessViolationException was unhandled Message="Attempted to read or write protected memory. This is often an indication that other memory is corrupt." Source="System.Windows.Forms"
Im designing a web browser and i continue to receive this error after going to about 3 websites it crashes with that error.
I have a BackgroundWorker object that I instantiated to perform a DB process on a background thread ansynchronously. I have event handlers for DoWork and RunWorkerCompleted. I can tell that the BackgroundWorker is disposing of itself because I added a message box into the Disposed event handler.Is it necessary to detach the event handlers to ensure that the memory is cleaned up and that there are not memory leaks?
View 1 RepliesI've noticed that every time I start a new thread in my program, the memory usage jumps about 1000k and it never goes back down. I have ensured that the thread is no longer running, and only one instance of my worker thread is ever running at a time. I am using ThreadPool.QueueUserWorkItem and ASyncOperation to get stuff done. The program starts using a Sub Main in a module that uses STAThread; I read that using STAThread instead of MTAThread makes it impossible for the Garbage Collector to get in and consider objects for garbage collection. However, when I change the STAThread to an MTAThread, the WebBrowser control in my frmMain cannot be instantiated.
I get this exception:
Code: An unhandled exception of type 'System.Threading.ThreadStateException' occurred in System.Windows.Forms.dll
Additional information: ActiveX control '8856f961-340a-11d0-a96b-00c04fd705a2' cannot be instantiated because the current thread is not in a single-threaded apartment. I do threading with the WebBrowser control, so will using MTAThread fix my problem? If so, how should I partition my code so that the WebBrowser control won't be affected by the above exception? I call the thread repeatedly with a timer (although only one instance ever runs at a time), and my program's memory usage starts at about 5000k and can jump to 300,000k+ depending on many times the thread needs to be called.
I cannot use Visual Basic 2008 at all. When I go to "new project" and choose "Windows Form Application" I get this error.I have tried multiple uninstall/reinstall with no result.A microsoft reply to this suggested that I needed: " .NET Framework 2.0 Service Pack 1 " I checked, and I did not have the .netframework 2.0 service Pack 1.
When I tried to download and install the above from Microsoft.com, the istaller said that "it was not allowsed" and I was not able to install the service pack 1.
I tried Uninstalling net framework 3.5, 3.0, 2.0 and then reinstalling .netframework 2.0 sevice pack 1; then reinstalling Visual basic 2008 express edition. At the reinstall of Visual basic 2008, .netframework 2.0 sevice pack 1 is unistalled by .net framework service pack 2.When I check the foruims for simiar problems, the formus are mostly for Visual basic 5.0, or other programs that I do not have.
Here is the programs I have installed:
Operating system: Windows XP
Microsoft .net framework 1.1
Microsoft .NET framwork 1.1 Hotfix(KB928366)
Microsoft .Net Framework 2.0 Service Pack 2
[code]....
All the security updates and hotfixes for Widows XP.
The follow code can be called about 6K times on the server it is run on then gets a out of memory error in the last catch statement. I don't see what is wrong with the code, it works well up until the out of memory..
Public Function AddUserToGroup(ByVal sSamAccountName As String, ByVal sGroupName As String) As Boolean
Try
Dim returnStatus As Boolean = True[code]......
I have two forms, Form1 and Form2. Form2 has a button to show OpenFileDialog. I call Form2 from Form1 by a button. My startUp Form is Form1. When i start debugging, i press my Form1's button to show my Form2, it shows, but when i click On Form2's Button to show OpenFileDialog it is giving me exception that
"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."
When i set my startup Form to Form2 and click Form2's Button to show OpenFileDialog then it shows!
how load a string containing the source for a .exe strait into a process without accessing the hard drive.
Currently my code goes something like this...
Imports System.IO
Dim file As String
file = file_source
[Code]...
I am using the following piece of code to load images as thumbnails to a FlowLayoutPanel control. Unfortunately i get an OutOfMemory exception.As you already guess the memory leak is found at line
Pedit.Image = System.Drawing.Image.FromStream(fs)
So how could i optimize the following code?
Private Sub LoadImagesCommon(ByVal FlowPanel As FlowLayoutPanel, ByVal fi As FileInfo)
Pedit = New DevExpress.XtraEditors.PictureEdit
Pedit.Width = txtIconsWidth.EditValue
[code]....
Update: The problem occurs while loading a number of images (3264x2448px at 300dpi - each image is about 3Mb's)
Alright, for a school project i'm making a filecrypter, and i need to load the executable directly into the memory.
For those that don't know it yet, a crypter consists of a crypter, and a seperate "stub"
the crypter crypts the file, and the stub is binded to the file, and upon execution, the stub is executed, and in turn executes the file it's bound to.
I have a RunPE sub, and on itself it works fine
Imports System.Runtime.CompilerServices
Imports System.Reflection
Public Class Form1
[Code]....
WebBrowser Example.zip IntroductionBecause the WebBrowser control that we use in .NET is a COM control, not all of its uses are straightforward and some of them (even those which seem like they should be easy) require that we dip into our Interop toolbox in order to properly implement them.
A perfect example of this is loading HTML content into the WebBrowser from memory, rather than a file or a URL. Anyone who's ever used the WebBrowser control before is familiar with the Navigate2 method, which tells the control to load content from a URL (or path to a file). Loading HTML content from memory, however, is a rather elusive practice because of the many steps involved in making it work.
MSHTML.HTMLDocumentYou might notice that the WebBrowser control exposes a "document" property. The object returned by this property can be coerced to the type of "mshtml.HTMLDocument" (you must add a reference to MSHTML to your project in order to make this work) as follows:
Code:Dim clsDocument As mshtml.HTMLDocument = CType(WebBrowser.Document, mshtml.HTMLDocument)
(NOTE: You will have to add a reference to the COM library MSHTML to your project to make this compile)
Once we create an instance of HTMLDocument, a whole new world opens up to us, providing all sorts of DOM access to the content of any given Web page.
If we were to create our own HTMLDocument object from memory, we could use the "write" method to write HTML content to the document from a string variable, like this:
Code:'initialize the document object within the HTMLDocument class... clsDocument.close() clsDocument.open("about:blank")
'write the HTML to the document using the MSHTML "write" method... Dim clsHTML() As Object = {sHTML} m_clsDocument.write(clsHTML) clsHTML= Nothing
WebBrowser Control ImplementationUsing the HTMLDocument returned by the "document" property of the WebBrowser control, however, is not as straight-forward. Because of the way that this object is created and initialized in memory (by the COM WebBrowser control), the "write" method fails when called as above. In order to write content to the HTMLDocument exposed by the WebBrowser control, we must first marshal the string value to a memory space that is compatible with COM. Once the string is properly marshalled, the COM interface IPersistStreamInit (implemented by the HTMLDocument class) must be used to pass the value into the object.
Interop DeclarationsIn order to pull all of this off, we must declare several Interop pieces, including an enumeration, a function, and two interfaces. The declarations for these pieces are as follows:
[Code]....
I'm writing a program that print images in full page. I.E, I print image on A4 paper, landscape. When I print an image without rotating it (the image IS landscape), the image uses all the space of the page, and is not cropped. it is OK. The print job is about 1.5 Mb. When I print an image WITH rotating it (the image IS PORTRAIT ), the image uses all the space of the page, and is not cropped. it is OK. The print job is about 28 Mb. The images are about 2000x3000 pixels, and stored in JPEG files (about 2.5 Mb each). I suppose that the 28 Mb should be the "uncompressed" size of the picture, and 1.5Mb, the compressed size...
By the way, When I look at the task manager, my application memory usage grows by job size, which seems to be OK. It grows either 1,5 Mb if no rotation is occured, and 25-30Mb when rotation occured.
Since I can print hundreds of image at once, my print queue will grow abnormaly if I need to rotate all
I have a new problem with this same Form Printing project and I get exactly the same exception but from the different point of code:
line 538: d.PrintFunction(c, typePrint, mp, x, y, extendedHeight, ScanForChildControls)
The exception type is System.AccessViolationException and it says (after I translate it from my own language in which the message is given in my pc, into English):"Protected memory was tried to be read or written. This often indicates that the other memory is damaged"
I am getting the following error: "Attempted to read or write protected memory. This is often an indication that other memory is corrupt". i am using interop service.
View 2 RepliesI'm trying to set a resolution to 600 for an image.I have:
-Public img As New Bitmap(6600, 4800)
-Public gr As Graphics = Graphics.FromImage(img)[code]
This code was put together for a one time run. It's purpose is to count all the pages in a group of images. After about 6000 of 1,250,000 images in ##X it throws an "out of memory" error. Besides it being thrown together for a one time run does anybody see anything obvious that could be causing the error?
CODE:
I'm trying to add an bitmap image in memory to a page using a System.Windows.Forms.PictureBox object, but it's not working. Here is my
HTML
Dim bytes As SqlBytes = reader.GetSqlBytes(0)
Dim image As Bitmap = New Bitmap(bytes.Stream)
Dim picBox As PictureBox = New PictureBox()
[Code].....
I create a program that loop the images in the picturebox, now the concern is while the images is looping or changing the usage of the memory of the usage of the computer is going bigger.i mean it's added the new usage memory when picture is changing. i wanted to dispose the previous usage so that maintain the usage level, but i don't know how
[Code]...
Ok so i have an jpg image of around 8.10mbs at around 13424 x 11344 pixels, i need to load the whole image in to a scrolling picturebox, is they anyway to do this without using so much memory for example like what google maps does n cuts the image down and some how stitches it all back to gether?
View 1 Repliescreating a program in VB.NET that can make an image(.img) of a memory card?
View 5 RepliesIm trying to make an advance chat room with some cool features.
How would i save an image in memory from a stream?
Is there anyway I can create in-memory JPEG file with a 'String' (yes with a String)?
View 3 Replies