is there anyway i could count the number of say Black pixels in my picturebox say i have a picture in it that has 1 black pxiel i would like to to but that to a string so i could put it in a textbox or a msgbox like this
so in RGB black would be 0-0-0 but how would i have it scan the pixtuebox and count how many pixels show up with the rgb color 0-0-0
I'm trying to make a -what i thought would be simple app.My intention was to build program that:1) i'd provide a grayscale image2) the program would count the black pixels the grey pixels the more grey pixels etc. (the hue) and the white3) would make the percentage sum of all pixels, that is: 300.000 black pixels (rgb 0 0 0) etc. given that 0 is the black, 100 the white. e.g a simple grayscale image is 55.2 white
This was my way and i don't think that is useful:
First of a button to convert the image to greyscale:
Dim bm as new Bitmap(source.Width,source.Height)
Dim x
Dim y
[CODE]...
Secondly, -and that's the stupid way- i did -or better i wanted to do- this: i put the code to dynamically create labels, each label having the colour of a pixel as background colour and as text the colour converted to rgb
The third step which i intended to do (i couldn't get pas two) was to sum up the labels etc.
My goal is to iterate through each pixel determining whether it is black or white. Ideally I want to do this one row at a time (so I can count the number of black pixels in each row). This is a bitonal image.I tried to get it started, but I don't understand what value(s) I'm supposed to be polling for. The following code takes a stab at it (i.e. makes a guess as to what value I'm supposed to check) and then outputs that value to a textfile.When I read the textfile, though, it doesn't look like anything useful.This code is an attempted modification of some code found in a CodeProject article.[code]
View 5 RepliesHow do I find the color of a pixel at a certain coordinate of an image in a picturebox?
I found a bunch of tutorials but they are irrelevant and do not work for vb 2008 express.
I see that the Line method is replaced with DrawLine, however; it seems like DrawLine must treated as an object as follows:
Private Sub Form1_Paint(ByVal sender As Object, ByVal e _
As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
Draw a solid black line 25 pixels from the top of the form.[code].....
When I attempt to use this code (call it), I must somehow bring about an event, but I haven't found how to do that.How do I "call" this sub?
i want to create image with width and height 64 and set all pixels to black
dim b as bitmap
b.width = 64
b.height = 64
[code]....
the code not working
Is there a simple way to get the width and height of a picturebox in pixels?
View 3 RepliesI have been searching the forums but have not found anything like what I am wanting to do.Anyways what would be the easiest way to count the number of key strokes? Then when X amount of strokes have been reached, display a message?
View 9 Repliesdesigning a Windows based computer program that will allow a user to enter some number (n) and a choice of a count up or count down for that many numbers. So for example, the user enters 5 as their number and selects the count down option, the message box displayed would contain the message: "Here are your numbers: 5,4,3,2,1,0"
View 14 RepliesThis is what I have, but It doesn't work with strings for some reason (only text files):
[Code]...
Is there a way to convert an Image to Black and white before displaying it in a PictureBox? Or is there a way to make a PictureBox display color images in black and white?
View 1 RepliesWhen my main form loads it also shows two other forms and has them scroll down from the upper right corner of the screen.
Here's the code for one of them:
Me.Visible = True
Dim x As Integer
Dim y As Integer
[Code].....
Currently, my program code is:
Imports System
Imports System.Data.SqlClient
Imports MySql.Data
Imports MySql.Data.MySqlClient
Public Class Form1
[Code]...
How do I get it where when I click button2, it will count the number of rows in the mysql table and then display it in a messagebox or label1.text?
I amusing VB.net to count the number of HPageBreaks in an Excel worksheet...here is the code I'm currently using:[code]Sometimes it returns the proper count...but most of the time it returns "0" and I have no clue as to why.
View 1 RepliesIt's exactly as the topic says. I have a text file with an unknown amount of words, typed out like this:tastymuffinsaredeliciousWhat I need is a counter that will tell me how many words there are, and in this case (besides a tasty muffin), there are 4 words. Is there a simple way to do this?
View 3 RepliesI'm helping the IT department at my school do an audit of all our printers (there are hundreds). They are all networked, so I wrote a vb.net program that sends PJL (printer job language) commands over port 9100 to all the printers to retrieve the page count. @PJL INFO PAGECOUNT actually gets the page count for all the printers, but for color printers we also need to know the color / mono page counts (number of color pages printed, number of black and white pages printed).... the number being returned by the PAGECOUNT command right now seems to be the total pagecount on color printers, so if I can find a command that will give me either the mono or color page count, I'll have the other number. I also need the serial number of every machine (the spreadsheet I'm working off of is unreliable). @PJL INQUIRE SERIALNUMBER actually returns the serial number for about half of the HP printers, and some random non-HP ones, but I can't figure out a way to get the serial number for the other 50%. I sent emails to some of the people who wrote the articles about PJL I was following, and they advised I try using printer spooler functions (from my brief google search it would appear these are windows API's that facilitate communication with a printer).
Does anyone have any experience with working with the Printer Spooler functions or know a PJL command I might have overlooked that will help me get any of the info I'm looking for?here is my program right now. Ignore GetSerialNumber2 and GetSerialNumber3... they don't work (well actually GetSerialNumber2 works on 5 printers... but yea). GetSerialNumber() is the one that gets the serial number successfully for about half of the printers. (edit: I took out those functions in the version I posted, along with some other stuff that wasn't needed for this, to fit the post size limit)
how do i count the number of rows that are affected when I updated a table, and display the number of affected rows in a message box ??
here is my code for updating the table ...
For Each row As DataGridViewRow In DataGridView1.Rows
req = row.Cells(Column1.Name).Value
If row.Cells("Column1").Value = True Then
[Code].....
Is there a way to check specific pixels in a picturebox to check the color? Basically what I have is a black square with some white dots, and I want to find the position's in the picture of the white dots.
View 2 RepliesI have a htpc project that I am working on. The main program loads dll plugins which are basically other win forms. On each of these forms, including the main program, I use a picturebox (a double buffered picturebox) for the background image and then draw everything on it by hand. Whenever I load the form from the dll and show it, I get a weird flicker. It looks like it is the previously used double buffer. Is there any way to clear the background double buffer before the flicker? Or am I going in the wrong direction?
Here's a couple of videos of the problem:
[url]
[url]
Notice the black screen with the white lines on it or the flash of the desktop after I click "Movies." How do I get rid of that?
I want to search my access database and count the number of records in the column "Type" in each group. For example
[Code]....
I have two listbox.listbox4 have a number from 0 to 10.i want to count that number and put into listbox5oid to count item 1 - 10 in listbox4.start count from item 11.
lisbox4
listbox5
1
[code].....
Can I do it,Like this..
I want to count the total number 0 - 9 in Textbox and put in to ListBox
TextBox1
ListBox1
012
0
[Code]....
I have a bunch of pdf files in a folder and would like to know the best way to either via a free PDF counter software or programmatically how to count the number of pages for each pdf and put the result in either a excel or access table. I already have the table populated with the pdf filenames. I googled "PDF page counter" and there were a number of hits, however I'm not sure how trust worthy these tools are. So, what some names of trust worthy pdf page counting tools/software and alternatively, are there any good VB.NET code samples that attempt this?
View 2 RepliesI am trying to count the number of records that match Course_ID = 1 in a table.
Here is the expression I am using
=Count(IIF(Fields!Course_ID.Value="1",1,0))
also
=Count(IIF(Fields!Course_ID.Value=1,1,0))
I always get the number of records in the whole table and that is not what I want.
how I can count the number of tabs embedded at the beginning of a line in a text file when im parsing the file.
View 3 Repliesi made this class to get certain pixels from screen:
[Code]...
Now i have lets say and array of pixels Example: Pixel 1 position X:100 Y:200 Red: 200 Green: 30 Blue: 40 Now i need to search all the sreen to find that pixel witout knowing its position. I need to have an output of number of results found and their position tnx.
I have a VB report which contains a list of locations. I have this list separated into areas and I need to count the total number of rows per area section. I have a groupHeader which contains my area field, then in the group I list the corresponding entries for that area. Then in the groupFooter I would like to give the total number of entries in the group. How can I do this? I have two fields in my groupFooter
groupCount
groupTotalAmount
I need to arbitrarily count the number of cells in a row. Then return to the cell directly below the cell from which I started counting. In this cell I need to print the number of cells that contained data in the row.
View 1 Repliesi am developing an online shopping site..so when the user adds any item to the cart i store it in a table...now what i want is to count the number of items in the cart as well as update the number of items in cart every time the user adds a new item....
Public Function AddToCart(ByVal itemID As String, ByVal itemName As String, ByVal itemPrice As Integer, _
ByVal offer As String, ByVal buyNo As String, ByVal userID As String) As String
Dim sqlStatement As String = "INSERT INTO shoppingCart" & _
[code].....
I'm using vb.net and a DGV to open a access DB. On load im filtering out everything except what was created on the current date. [code]...
View 1 Replies