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].....
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?
This one has me completely confused. I'm using the function below in a .vb file (it's the only function in the file as of right now).
[Code]...
I've a requirement to have PreCompiled webpages and Non-PreCompiled webpages under same application. For example below is my structure:
/Bin
/Test1 (PreCompiled)
/Test2 (NonPreCompiled)
/Test3 (PreCompiled)
I would like these to have their separate "Bin" folders too if possible at all (I tried using "Probing" but I guess that's not allowed for web apps and defaults to "Bin" folder). If not that then definitely some ability for these to work together under one app/virtual directory because I'm not allowed to create another at any cost :(
I want to create an ExpressionTree where a Func(of Vector, Vector, Vector, Vector, Double, Double, Vektor) should be called. So I use
Expression.Call(Forces(0).Function.Method, {Vec1, Vec2, Vec3, Vec4, Double1, Double2})(Vec1-4, Double1-2 are declared as ParameterExpression and Forces(0).Function as Func(of Vector, Vector, Vector, Vector, Double, Double, Vector). But I get an AgrumentException, because Forces(0).Function.Method has seven Arguments. (System.Runtime.CompilerServices.Closure as seventh argument at Index 0).
I have the following piece of code: trying to use this in 2.0 framework. getting error for not having a return statement before exit function.[code]...
View 4 RepliesSo I have a function that looks up values in a jagged array, and it goes like this:
Private Function Lookup(ByVal Search_path As String) As Integer
Dim i As Integer = 0
Do Until MasterIndex(i) Is Nothing 'throws an exception here
[Code]....
Problem is, when I test this with an empty array, it gives me the error of Index was outside the bounds of the array at line 3. How do I fix this?
How to create a function that replace the apostrophe (') into empty string?
View 3 Repliesi 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
I'm using Bitmap to show picture box like slideshow using Timer. For each timer interval, I've to go for new instance of Bitmap, there System memory increases to 1MB, How to resolve this, 'BG is picture box
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]...
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]...
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 RepliesI'm trying to use a ToolTip directly to a Bitmap Object (System.Drawing.Bitmap), aparently I can't do this because Bitmap isnt a Windows Control.
View 1 RepliesI 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:
[Code]...
how can i create a monochrome bitmap from a semi transparent bitmap in vb.net? the bmp is for a transparency mask image for an icon i'm trying to create with the CreateIconIndirect API function.
i'm using vb2008 .Net3.5, but i would prefer an answer that would also work in vb2005
[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, _
[Code].....
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 RepliesHere 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.
I have a grass image located here in my directory. I want to just create a Bitmap, but I am getting an error. (Parameter is not valid.) Immediate Window: A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll
[URL]
private void Form1_Load(object sender, EventArgs e)
{
Bitmap bmp = new Bitmap("grass.jpg");
}
bertino
So I'm going through a tutorial on how to get stuff in my vb form to update a Access Database. I know, I should be using sql, but Im just learning. Anyways, here is the code..
[Code]...
I have this code.
vb
Case Keys.U With Me.TextBox1 Dim selectionStart As Integer = .SelectionStart
Dim
[code].....
As the title says I have a form with many databound textboxes. some of these boxes have data in them and some are empty. I need to add them altogether, so far all of the conversion methods I have tried err out when they run into an empty string, except Val, but then Val won't handle the string with a $ in it. I've tried decimal.parse which handles the $ but not the empty string. So I seem to be in circle that I can't get out of.
View 2 RepliesI am trying to render a hyperlink to html. ( etc)
When the page loads it works fine. (and lots 10 links) on the update panel it hits the same function and tries to get another 10 links. I set the navigationURL to something like
"../Folder/Mypage.aspx?498592ghjgfosdfgo"
It is set identically both times(load and updatepanel postback) but when i try to render it to html the second time (on the update panel) it adds "../" to the front so i end up with
"../../Folder/Mypage.aspx?498592ghjgfosdfgo"
The function where it changes here
Public Shared Function RenderControl(ByVal c As Control) As String
Dim sw As New IO.StringWriter
Dim htmlw As New HtmlTextWriter(sw)
[Code]....
I have a class with a subroutine as follows:
Public Sub SetPermissions()
If IsNothing(HttpContext.Current.Session) Then
Exit Sub
Else
[code]....
I know that my session variable is not yet set, hence a null value, that's why i'm trying to handle it with IsNothing, but my code still bugs out on me.
For some reason one of my controls produces the following excecption error when adding to the VS ToolBox:Request for the permission of type System.Security.Permissions.SecurityPermissions, mscorlib, Verion=2.0.0.0, Culture=neutral etcWe have identified it is this class within the Custom Control but we not sure whyit is erroring
View 2 RepliesIm working on a board game in vb.net. But Ive stumbled on a problem; for some reason Im not getting the correct location reference when I move my picturebox. Let me explain the procedure; First it locates the current position of Red1 with Red1Top and Red1Left, and assigns a number for its position; intCurrentSpot. Then it adds what ever was rolled from the dice intDieA to the current location; intCurrentSpot and the second case statement moves it to the new location. HOWEVER position 11 reads as position 10 and hence gives the user an incorrect reading to where the dice points. Ive checked the numbers over a thousand times and still getting an incorrect reading, what am I doing wrong or can I use something else to get Red1 location?[code]...
View 12 RepliesI have a string with 3 rows. Each row is ended with <CR><LF>. I have verified this by writing the string to file and open it in notepad++The problem I am having is that I want to split this string into an array. When I split on vbCrLf I get 6 lines with this code:
View 2 RepliesI've been trying to trace down a bug for hours now and it has come down to this:
Dim length as Integer = 300
Dim buffer() As Byte = binaryReader.ReadBytes(length)
Dim text As String = System.Text.Encoding.UTF8.GetString(buffer, 0, buffer.Length)
The problem is the buffer contains 300 bytes but the length of the string 'text' is now 285. When I convert it back to bytes, the length is 521 bytes...The same code is a normal WinForms app works perfectly. The data being read by the binary reader is a UTF8 encoded string. Any ideas why Silverlight is playing funny buggers?
I'm trying to create a program that produces random sentences as output. With five arrays of strings, one each for nouns, adjectives, verbs, prepositions, and articles. Each array should hold several words for that part of speech. It's supposed to generate sentences by randomly choosing eight words (randomly generating eight array indices) from these arrays, always constructing sentences by using the parts of speech in the following order: article, adjective, noun, verb, preposition, article, adjective, noun.Also, theh code should be properly modularized so that the code to generate each part of speech is not repeated.
View 8 Replies