Copy A Bitmap To A Form?

Oct 12, 2010

I know how to copy a bitmap to a picturebox.image but how do I copy the bitmap to the form?

Example:

I want to create a form 1600x1200 and put a 1600x1200 image on the form to cover the entire surface.

Then I want to put several pictureboxes 256x40 (Tool Bars) at different locations on the form.

If pictureboxA is at x32, y32 on the form, I want to copy from the form at x32, y32 256x40 to the picturebox.image then draw

the buttons on the pictureboxA.

I know how to load a .jpg or .bmp to the form from a file. This won't work for my purpose.

If there is no fix for this then the only thing I could do would be to create the bitmap then save it to a file, then reload the file to the form. I want to avoid this... It takes up time :(

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Using a blank form I draw simple colored shapes to the form(x800 - y600 @ x0 - y0).

I'm using a picturebox(x800 - y600 @ x0 - y0), how do I copy whats on the form to the picturebox?

I want a mirror image copy.

Also, how do I copy from picturebox to form?

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BitBlt Copy Bitmap To Screen?

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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Take A Snapshot, Or A Copy Of A Control, For A Bitmap?

Dec 13, 2010

I am trying to take a snapshot, or a copy of a control, for a bitmap. I'm wanting to do this to a listbox, but part of the listbox may be hidden.On the mouse_down event I need to get the snapshot of the whole listbox (even though parts may be hidden behind other controls, I need the whole listbox) and draw it to the screen in the same location as the original listbox (but the hidden parts still stay hidden behind the other controls on the bitmap).

On the mouse_move event I need to move the snapshot up/down based on mouse movement. This also moves the listbox up/down and this code is done. I will just move the snapshot of the listbox the same way as the original listbox.On the mouse_up event, I will dispose the bitmap and display the original listbox again.

I am doing this because moving a listbox up/down is really messy. It's a custom drawn listbox and looks horrible moving, so I figured if I could snapshot it, move the bitmap while visible, and listbox behind the scenes, it will flow smoothly and no one would notice I am scrolling a bitmap instead.

Double buffering the form and listbox didn't help . I've done some graphics.drawstring before, but not much on other graphics.

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Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tic Dim img As Bitmap

img = New Bitmap(System.Drawing.Bitmap.FromFile(FileIO.FileSystem.GetFiles

[CODE]...

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i'm using vb2008 .Net3.5, but i would prefer an answer that would also work in vb2005

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I want to display a bitmap on my form, and then remove it at times, and put it back again.
I have the Bitmap in my resources folder.in my form properties, it is selected as background image.

somewhere in my code I set the background image to = nothing (that makes it disappear) but every time I try to bring it back, I get file not found.I got it to display when I hard-coded the entire path and filename.[code..]

Obviously, when I publish and distribute to clients, the file won't be there.[code...]

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VS 2010 Class Library - Cannot Use Form / Screen Or Bitmap

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I'm trying to create a DLL with some useful methods and subs for my use. But when I tried declaring an object for Form or using the keyword Screen, Bitmap, etc.. gives an error saying that "The type 'Screen' is not defined" and like that..

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Here is a short program to demonstrate my question. I just want to extraxct a rectangle bitmap from a big bitmap.Code as follows:

Private
Sub Button3_Click(ByVal sender
As System.Object,[code]....

Execution stops when hitting the Dim cloneBitmap statement, which should have created a bitmap out of the rectangle cut out.The message is:

"MissingMemeberException was unhandled.

No default member was found for type 'bitmap"

I just don't get it. Seems that the method Clone(Rectangle, PixelFormat was not found.

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[URL]

private void Form1_Load(object sender, EventArgs e)
{
Bitmap bmp = new Bitmap("grass.jpg");
}
bertino

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The code below reads an Icon from an .ico file, converts the Icon read to a Bitmap and saves the bitmap using:

Bitmap.Save(PathA)
Then does:
PanelShowWrittenIconA.BackgroundImage = New Bitmap(PathA)

[code].....

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[Code]...

when i run the program i get the error message that app is not declared

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In the first line of code, any changes made to Ds will reflect in DsTemp. However, in the second line of code, any changes made to Ds will not reflect in DsTemp because we are only "copying" the contents & schema of Ds. Likewise is there a method or a work around to "copy" a Form object?

[Code]...

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