Desktop Screenshot To Picturebox Not Working Using Bitblt?
Jul 29, 2010
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Finally "upgraded" to vbnet and got no idea how to do this! What I'm doing is using bitblt to take a screenshot of the desktop and put it in a picturebox. What I really need is just the raw data from the picture, not the picture showing on a picturebox.
Only problem is that it is not working at all!
Here is the entire sourcecode. How is it not working??
Module1
Module Module1
Public Declare Function GetDesktopWindow Lib "user32" () As Long
Public Declare Function BitBlt Lib "gdi32" (ByVal hDCDest As Long, _
[Code].....
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May 1, 2011
I am looking to create simple application that means that when the 'Print Screen' button is pressed, the screenshot is not just sent to the clipboard but saved to the desktop in either JPEG or PNG format.The application will run at startup so that the 'new' print screen functionality is there but the interface of the app is opened manually.(the app interface includes simple options such as choose where file is saved.)
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Jul 27, 2011
I'm trying to make a program that kinda works like Windows 7 when you put you're mouse over a program in the taskbar, and it pops up a small realtime screenshot of the running program while its minimized.Anyone know how I can go about doing this? I took a small code from the internet, but I always a error "Generic Error occurred in GDI+".[code]
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Mar 12, 2011
I have a picturebox. I want to at certain points take a screenshot of whatever is in that picturebox and write it to a bitmap variable.The images in the box will be of varying sizes and i will be tracking the sizes using image.height and image.width. I would like to use those to define the area for my screenshot.
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Aug 29, 2010
I am making a program to automatically take and save screen shots and I am using the F12 button. It works fine, but the problem I have is when I press F12, it will take and input the picture into the PictureBox1, but if I try to clear it, and then do it a second time, it wont work a second time. My clear button code is:
Picturebox1.dispose()
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Nov 21, 2011
here is some of the code that i have:
Public Function CaptureImage(ByVal X As Integer, ByVal Y As Integer, ByVal Width As Integer, ByVal Height As Integer) As Bitmap
Dim JPEG As New Bitmap(Width, Height)
Dim G As Graphics = Graphics.FromImage(JPEG)[code]....
when the timer hits a 2 second interval the picturebox on form 3 gets a new image from the screen shot that form 4 takes off of form4's area. i want the user to select a folder with the "folder browser dialog" and i want each frame capture to be saved to the folder (every 2 seconds) that the user chooses as "1.jpg, 2.jpg, 3.jpg" etc .
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Dec 5, 2009
Set contents of picturebox as desktop background?
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Jun 11, 2010
I'd like to be able to take a "Screenshot" of a specific control within my form (regardless of control type) and place that "Screenshot" inside a PictureBox.There's lots of info available for capturing a whole screenshot, but I am specifically after capturing an image from the bounds of a specific control on my form.here's what I've tried: I get no image in my Picturebox_myCam is a control on my form with the image I'd like to capturecamera1 is a PictureBox on my form that I'd like to place that image invb.net
Dim bmp As New Bitmap(_myCam.Width, _myCam.Height)
Dim gr As Graphics = Graphics.FromImage(bmp)
gr.DrawImage(bmp, New Rectangle(New Point(camera1.Left, camera1.Top), New Size(200, 150)),
[code].....
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Nov 22, 2009
I created a new ShellAppBar window (similar to the taskbar) but i want it to replace the taskbar. My question is: i can remove the taskbar but can't resize the desktop's working area, so my appbar is sitting above the taskbar (which is not even there).
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Jun 15, 2010
i am already mad at the fact that control arrays are gone..Is the syntax for BitBlt that same from vb6 and vb.net? Can i still use the vbSrcAnd, vbSrcCopy, and vbSrcPaint?I have seen some things on going around control arrays, but how would i do some control arrays for bitblt? i tried
Dim picPicture(0) as picturebox
Dim i
for i = 0 to 10
redim preserve picPicture(i)
picPicture(i).Image = Application.Startuppath & "img" & i & ".bmp"
next
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Dec 21, 2009
I am trying to use Bitblt for drawing one image on another. but when i try to get HDC From first image it gives Negative pointer value, so BitBlt returns 0 value. is it possible to get device context from bitmap directly?
[Code]...
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May 18, 2010
I was told to use bitblt to crop my image. But i am new to vb and am really confused as to how to do it. I am making a board game. The player chooses its colour of player (a pawn),this image is then placed on the board. I want just the pawn to show and not the box around it.
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Mar 29, 2011
PictureBox1.Image = My.Resources.ResourceManager.GetObject(z)
PictureBox1.Visible = True
My.Application.DoEvents()
I've just added a load more image files, bringing the total up to 108.When the program reaches this point, (above) it fails with a 'Can't find File' error.I've tried many times to reload the image files, set all their 'Build action' to 'Embedded Resource' but I'm not at all sure it's doing it. I get an error message saying 'Corrupt .resources file'. but I've opened all the files in Paint Shop Pro without a problem.I'd be surprised if there's an upper limit to the number of image files I can put in the resources file, but not as few as 108 surely ! Most of the image files are between 100 - 350 Kb but 16 are about 1,250 Kb?
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Mar 7, 2012
Edit: Fixed, I created a compatibleDC for the graphics object, and a handle for the bitmap (using b.gethbitmap), then used the SelectObject function inside GDI to select those two, and used the compatibleDC instead of hDc in the BitBlt function I've been trying to draw a bitmap to the screen (device 0), however I have encountered a problem copying the graphics using BitBlt.
Initially, I was drawing directly to the desktop using SetPixel (gdi32), but it was slow, so now I am setting the pixels of a bitmap object and then creating graphics from that object, and copying the hdc of the graphics to the screen.My guess is that I am adding the HDC of the graphics object to an intptr, which essentially gives me the HDC of the container of the graphics object, which is not what I need. However even so, I have not found any information on how I could copy a bitmap to a device other than using BitBlt.
This is my current code (Windows forms app, textbox, button) The textbox is the device to copy to, and the button starts it. For testing purposes, set the textbox text to 0, and press the button. You should see a black box (50x50px) in the top left corner of your screen. The colour should be blue if it is working correctly:
Public Class Form1
Declare Function GetDC Lib "user32.dll" (ByVal hwnd As Int32) As Int32
Declare Function ReleaseDC Lib "user32.dll" (ByVal hwnd As Int32, ByVal hdc As Int32) As Int32
[code]....
The way it works is it calls the function setpx, given a location and color from within a loop iterating through all of the pixels in a box (50x50 in my code). The setpx function will then call the setpixel fuction on a bitmap b. This part is working fine.Next, it will define a graphics object g from the bitmap, and I use BitBlt to copy g's hdc (g.gethdc) to the screen. This is not working correctly?
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Oct 13, 2009
I use vb.net 2005.I want to take one image and place it on top of another image, I want to blend the images using various techniques such as OR or XOR od AND functions.I understand BitBlt does this.1) Is this the technique i should use in .net? Or is there some complicated parameters burried deep in the graphics.drawimage method?2) How do i declare the BitBlt function and what are the values of the ROP parameters?
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Feb 24, 2009
It's several years since I last used BitBlt and the like in VB6, and I'm just refreshing my memory with a little sample app before using it on the current project I'm working on in VB2005. I've come up with the following:
[Code]...
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Mar 9, 2010
I'm using BitBlt and GetDC to capture windows and save them to a bitmap, but a window that is covered or overlapped by another window appears with that window showing over top of it. Is there a way to stop this from happening? I have the window handle available, the graphics context, and a Process object.
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Oct 4, 2010
I have a BitBlt wrapper function in my VB project. It works just fine when compiled as Any CPU, but when I aim it at x86 it creates an empty bitmap. I must use x86 as other parts of the app require it. Here is the code:
Imports System.Drawing.Imaging
''' <summary>
''' Provides the static method ControlCapture used to
''' take screenshots of the specified control.
[Code].....
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I have a Winform application where i added picturebox's to a flowlayout panel dynamically from code. I have successfully managed to add a handler for doubleclick and click events the problem i have is that when i add both together it only seems to work with the click event and not the double click. where I could bee going wrong? Iam using VS2008 .NET 3.5 my code looks a bit like this :
Public Class Class1
Dim WithEvents picturebox1 As PictureBox
Private Sub Brochure_Creator_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code].....
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In VB6 you could BITBLT things around before refreshing the screen. In .NET, I'm aware of DrawImage, but that can only be done on a paint event rather than before anything gets painted. The issue I have is, I need to open several files with image data in them and then build a bigger image with those smaller images. Before I could open them, BITBLT them to a Buffer. As far as I can tell .NET offers no way to do this as the only function I've been able to find (DrawImage) only works within the paint event. Is there still a way to do this in VS08 or no?
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I'm working on one of my applications and I'm trying to find a way to use the "Go To Desktop" function that goes directly to the desktop without minimizing any window (This can be achieved by clicking on the Win + D buttons or on the desktop icon in the quick launch toolbar), but how can I activate it using vb? I thought about sending keys but I guess there is more offical ways to do it.
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I know how to get a screenshot but how to I add the cursor into the picture (including when the cursor changes)? [code]
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how to take a screenshot in vb.net. Preferably in a JPG or GIF format, but if not any format will do.
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I want to get a screenshot that is behind Firefox.
That means. I want to hide firefox in that picture so i can see everything behind it.
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Here I am once again, trying to make yet another program. am currently looking for a method to screenshot when the user clicks.?Example: When you open the program, and click, it will capture a screenshot and automatically save it to a folder. This will continue until the program is closed.
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I have a program that has the ability to take a screenshot of a Panel on a form.I provide the user with a Save File Dialog box to choose the path of the saved .png image.My problem is that if the user does not move the modal Save File Dialog box out of the way before clicking the save button, the screenshot includes the box over the top of the panel.
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I'm trying to take a screenshot of my screen, and get the picture from memory. Then convert it to a string so it can be sent over a network. So far I've tried to adapt this code.
Dim
ScreenSize As
Size = New
[code].....
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