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.
View 6 RepliesIn 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?
View 6 RepliesI 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?
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I have an application which first load an 1200*800 image into an 600*400 picturebox. When i crop the whole image in picturebox and save it, the size will be 600*400. How can i make it save in 1200*800?
View 6 RepliesThe image can be anything. It can be jpg, png, anything.
Load it.
Crop it. Say removing first 100 pixels from the left.
Save to the same file
I'm developing a free project for my A/L Project. How to crop a image in a Image Box in Visual Basic 2008 Exp: Using WIA layer.
View 1 RepliesI'm trying to crop and resize the image in richtextbox.
View 2 RepliesI looking for a way to crop/stretch a imagem and save using vb.net
View 3 RepliesHow can I crop an Image to preset dimensions and size using code.I can do this with MS Office Picture Manager, but I want my users to do this from within the app. using the preset dimentiomns and sizes.[URL]
View 1 RepliesI am trying to do a code for my application that will crop a selected images into oval shape.
I tried to search for a reference on the internet there is only example on how to resize it. But is it possible to crop it into shapes?
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
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
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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?
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?
View 9 RepliesIt'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:
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[URL]
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, _
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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.
View 5 RepliesI 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.
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I need to know how to make the web application crop an image and resize it as a thumbnail to use it later on in the application?
View 3 RepliesI could crop up a string to give me a cirten value.
The specified string involves a username, and a price, along with other numbers as a result of math.
"Would you like to buy "Relic TV System" from Demi0092 for $1,009?"
So in this situation I want to gather the "1,009" without any of the other text.
To reduce the size of some images I have, I'd like to remove the white padding that some have. The idea would be that if one has large white areas on the borders, then those can be cropped to save some space.
View 1 Replieshow to rotate,resize,crop any image and save it using vb.net ?
View 2 RepliesPublic Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Form2.PictureBox1.Load(bm2)
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So I'm trying to take a screen capture of the windows form and display only a certain specified area of that screen capture in a picturebox on a different form. Kind of like this. First, take the screen capture of the form: Then get a specified area of that form through x,y coordinates or something and display it on a picturebox on a separate form.
How I can by clicking a button on my app. open a picture in a picturebox with MS Office Picture Manager?
View 8 RepliesI'd like to verify if an image control has an image loaded . If it does , I want to unload that image (and load no image) , but if the image control has no image loaded , I want to load an image . Is it possible ?
If ImageMY.Image.Equals(Nothing) Then
ImageMY.Image = System.Drawing.Image.FromFile("C:ImageBlaBlaBla.jpg")
Else
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I created a new cursor (it works properly, I tried it in windows 7) but is not working for me in the program.I took the Windows cursor (aero_helpsel_xl, from C:WindowsCursors) and it appears to me the same error.i use with this code:
Me.Cursor = New Cursor("Patch..")
The problem say:: "{"Image format is not valid. Image file may be corrupted.
Parameter name: stream "}"
edit: I realized what the problem ... It can read only cur files with 24-bit color and lower - but it shows only two colors: black and white.
I have an app that loads a jpg into a picyure box, then updates exif data in exifworks classThe problem is that when I save the image(from image used for picture box) or class (to save exif data) then try to delete, sometimes I get success, others it won't allow delet I have gone to the trouble of using gc.collect, do events, put the delete in a timer & wait for the delete before continuing & still get the problem
View 7 RepliesWith a button click event, how do I make a picture box image property switch to a random image from the resources folder?
View 1 Repliesi want to save image in ms access 2000 database & i want retrive it in a crystal report in vb.net 2005
View 8 RepliesI've been searching for hours tonight searching existing posts, other websites and all i can find are examples of how to capture a image from a webcam.Does anyone have any code that simple talks to the camera device via WIA, and then saves every image found on the device to a hard drive?I found this code below. Credit i cant tell you as i have a bunch of different flavors of code, but this only saves the file as a tmp file, and not the actual image file i expected after selecting?
Imports System.Drawing
Imports System.Runtime.InteropServices
Imports WIALib
[code].....
I am using ITextSharp and am trying to set the alignment of an image.
In C# (as per all the examples) it is:
code:
I cannot work out the equivalent of the "|" in VB.