Interface And Graphics :: Load Image And Access Its Memory Buffer
Mar 31, 2011
I 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?
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Jun 1, 2011
I am working on vb.net win form. My task is display the file names from a folder onto gridview control. when user clicks process button in my UI, all the file names present in gridview, the corresponding file has to be loaded onto memory stream buffer one after another and append the titles to the content of the file and save it in hard drive with _ed as a suffix to the file name.I am very basic programmer. I have done the following attempt and succeeded in displaying filenames onto gridview. But no idea of later part.
'Displaying files from a folder onto a gridview
Dim inqueuePath As String = "C:UsersDesktopINQUEUE"
Dim fileInfo() As String
[code]......
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Oct 28, 2011
I load my picturebox with a jpeg. If I put my DrawObjects() sub into picturebox paint event.When ever a picturebox.refresh or picturebox.visible = true (vb.net seems to draw my DrawObjects() first, then load the jpeg Image over my drawing - erasing drawing) Is there a way to get the picturebox to redraw the jpg image first then draw on it, in picturebox paint event?
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Aug 7, 2010
[URL] This is for vb6, and I know this is a .net forum, but hopefully some one may know the answer as I have tried countless other places. The buttons appear properly after they are clicked or issued a .refresh command.
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Nov 5, 2009
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.
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Apr 4, 2011
Just want to know if it is possible to do an image mapping in VB2010?..
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Jul 31, 2009
this error is appearing when i open a form in designer mode. A picture showing what happens to VS when this error occurs.The error code is:One or more errors encountered while loading the designer. The errors are listed below. Some errors can be fixed by rebuilding your project, while others may require code changes.Unable to cast object of type 'System.Diagnostics.DebuggerNonUserCodeAttribute' to type 'System.Attribute'.
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Aug 21, 2011
I can get the image to rotate the problem is that on every step throught the loop the image goes to it inverse or draw backwards.
Code:
Public Class Form1
Public K As New Grid_Tiles
Public D As Integer
[code]....
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May 28, 2009
I have an application that downloads a .jpg snapshot from an IP camera, writes it to the server hard drive, attaches it to an email and sends it out to my users. Pretty simple until one guy had to mount his camera upside down and that's how he received the image via email.
It gets a bit annoying after a while, so he asked me if I could rotate it 180 degrees before attaching it to the email. I have absolutely no idea - hence my post. The app is on a hosted ASP.Net v3.5 web server.
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Dec 10, 2010
I'm creating a Image viewer and was wondering if anyone could help me with resizing an image, and converting the image to grayscale? My knowledge of visual basics is very limited so any code snippets.I am wanting to resize the original image to a 3 x 3.
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Mar 1, 2010
I'm using below code 2 add image into a picturebox during the run time. i could add image but when i clicked the picture to make it become smaller, the picture quality is blur which not as the initial picture.
[Code]...
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Sep 11, 2009
how do i change the picture inside a picture box.I wanna make 5 dice that change when you press roll.. the number generator is easy i just wanna use graphics rather than a label to display the numbers.
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Mar 29, 2012
anyone know how to do this, but wit a browse for folder aspect..like i open up my browse for folder window, select the folder i want and it displays the .png file in picturebox..i'm trying to figure it out..here is what i have so far..i have it setup where i'm opening up a folder and loading certain files in my checkedboxlist..but i also want a .png file that is in the subfolders(the only .png file in the entire directory) to be displayed in the picturebox..but the folder is going to be changed depending on which folder is selected..so it can't be a set directory or path..basically has to change like the checkedboxlist.
[Code]...
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May 13, 2009
I am trying to draw an image from a MS Access database by use of e.Graphics.DrawImage(New Bitmap()). In my database Row 0 Item 1 holds the path to the image I want to draw.
My current code looks like this:
Code:
Private Sub pnlStart2_Paint(ByVal sender As Object, ByVal e As_ System.Windows.Forms.PaintEventArgs) Handles pnlStart2.Paint
e.Graphics.DrawImage(New Bitmap(ds.Tables("Track1").Rows(0).Item(1)), 3, 3)
End Sub
When I run my program I get the following message in my code: Illegal characters in path how I can draw the image from the database?
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Nov 16, 2010
What am i doing wrong on this code? im trying to get my form into a jpeg picture, but everytime it only saves a black screen of what im doing
Code:
Private Shared Function BitBlt(ByVal hdcDest As IntPtr, ByVal nXDest As Integer, _
ByVal nYDest As Integer, ByVal nWidth As Integer, ByVal nHeight As Integer, _
ByVal hdcSrc As IntPtr, ByVal nXSrc As Integer, ByVal nYSrc As Integer, ByVal _
[Code].....
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Sep 23, 2008
I am trying to verify that an image has been loaded into the picturebox1. I am loading the image from the web and need to verify it has arrived before I can save it to disk. If I save it to soon I will save nothing and that will crash the app. I have tried to use 'if PictureBox1.image = nothing then' ... 'End If', but that isn't a valid check. I can obviously not check picturebox1.image if it is empty or has an image.
So the question is, how do I verify that the file has finished loading?
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Jul 11, 2004
I am trying to incorporate in my vbdotnet application a form in which I would like to make a thumbnail from an image. So what I have is two picture boxes, one with the source image and the other with the destination image, I would like to crop the image from picture box 1 and display it on picture box 2, but the way I wan to crop it is not giving the coordinates of the selected area box but to simulate a selection area box in which the mouse can move the box and select the area of the picture to be cropped. This selection area box would give me the coordinates i need in order to proceed the cropping. The problem is I don't know how to create this selection area box. It is like doing the cropping on a graphic design software like Macromedia Fireworks, Adobe photoshop, even paint.
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Aug 13, 2008
I have a map image and i want to open it look like ACDSEE (very fast)my image is 12756 x 8504 pixel and i try backbuffer but not work for me.
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Aug 5, 2009
We are trying to get an image to a printer.Does someone any idea how to do that, or maybe someone has code?
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Jan 22, 2011
I vagely understand how to edit an image using Graphics. I can rescale an image using scaletransform but I want to be able to use a dynamic scale i.e., given an image with (x,y) coordinates, I want x_new = x_old + y*Factor so that when the image is stretched one end is stretched more than another.
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May 3, 2011
I would like to create a pixel viwer (i.e. zoom into a picture to view the image's pixel information - Similar to windows paint or Photoshop). I have created an image zooming code, but it enlarges the image and sadly, doesn't show the blocks of pixels I was hoping for.I have thought of several ideas, but each worse than the next. As an example, re-create the image, increasing each pixel's area based on the zoom-level. But I can tell already that this process would be slow and judging by photoshop (or paint) there is a quicker method.
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Aug 30, 2009
I start some new project and i finding some way to save image from webbrowser to file. I can find url and get file. But i need cached file from webbrowser, bacause its generated :/ . I make lot of googling but no result..
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Aug 13, 2009
Is it possible to capture a panel and save it as an image?
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Jan 4, 2009
I am trying to put an image selected by the user into the form background. This means that an image from a specified file destination to be set as background.
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Dec 5, 2008
I need to be able to count the number of pictureboxes whose image is not "nothing". At first, this seems really simple (and it probably is) but I'm unable to see a way to access the array I created. (This is a workaround to the .net framework's lack of support for control arrays.)Here's the code as it exists now. Please look at it and give me a pointer in the right direction.[code]
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Nov 19, 2011
I want to create a table as displayed in the image in VB.net. How do i do it ?? I tried LISTVIEW with Gridlines, but it has both horizontal and vertical lines, but in the image there is only Vertical lines.
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Aug 18, 2008
How can I evaluate pixels within a Binary Image?What I have done so far is to take the image and use it's "getPixel" method and do a comparison of this pixel to black/white. But that can't be right... Can it? It's a binary image, I should be evaluating each pixel as true/false. Correct?
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Aug 26, 2009
I've got a basic idea of what i'm wanting to do, just been out of it too long to remember how to do it. I'm wanting to load an image, not display it. Get all the pixel data, then redraw the image pixel for pixel in mspaint.
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Jan 5, 2012
What i'm trying to do is fill a non rectangular region (actual build up out of 6 points) and draw a bitmap in such a way that it stretches with the region. Now for drawing a normal bitmap or even a trapezoid bitmap there are examples on the net. but drawing anything more then that with GDI+..
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Nov 12, 2008
How do I rotate a bitmap image that has been placed in a picturebox? I need to make it appear upside down or rotated according to user input. I can't find anything in the properties to do this
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