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In order to measure the distance between two points on a plane, you need, at a minimum, one of three things:
1) A calibration of a known distance between two points in the photo on the same plane as the subject being measured. An example would be a scaled ruler or some other measurement.
2) The focal length of the lens used to take the photo.
3) The distance between the film plane in the camera and the target objects in the photo.
From there, it's a matter of some trigonometry to get the distance between any two points on the same plane in the photo.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hey
Thanks for the fast answer.
1) - This 3 points are no problem.
But
1) How Do I get the two pupils? - So that I I can't take a foto of a bottle or something?
2) How can I take the outermost points of the frame automatic, so that the user only has to insert the value for this points?
Is there any sample, where I can take a look (Written in VB?)
THX
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Now your getting into an area that I don't do. Image recognition is not part of my background at all. This is goign to take some SERIOUS research to find those pupils.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hey
OK & when "we" don't control, if there are pupils or not. Do you know, where I can find some tuts?
THX!!
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Zero-G. wrote: OK & when "we" don't control, if there are pupils or not
Zero-G. wrote: Do you know, where I can find some tuts?
The same place I'd start. Google[^]
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hi All, I need to refresh a combobox list (in VB .net) when a new item as been added to the SQL database. Protected Overrides Sub RefreshItems seems to be the way to do it but I cannot find any example of how this is used. I am still trying to get to grips with .net!
I have a sub which calls a form so the user can add details of an item, and when it returns from the form (which inserts the item in the database) I need to update the list in the combo box.
I would be most grateful for any assistance
David Loring
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Dear Its Actually refreshing the whole combobox and this snippet sub works as complete redraw of combobox .Better go for regular properties rather than overriding the class properties. For such if you really want to get proptected properties trhen you are welcome for such query till then try regular properties to get work done like clearing combo
![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
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I have an app to generate excel file using excel.dll.
Although after i finished the creating a excel file, i released excel COM.
But in the 10th excel file, it throws System.Runtime.InteropServices.COMException HRESULT exception.
Someone can help me? this is the urgent message....  
i love IT
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What's the complete exception that's thrown? We're looking for the HRESULT number?
Did you call Quit on the Excel object before you released it?
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hi Dave Kreskowiak,
Thanks for replied me. I called Quit() before i released it. And i also used
System.Runtime.InteropServices.Marshal.ReleaseComObject(appExcel)<br />
<br />
Dim proc As System.Diagnostics.Process<br />
For Each proc In System.Diagnostics.Process.GetProcessesByName("EXCEL")<br />
proc.Kill()<br />
Next
to relase it. but it still throws exception: HRESULT:0x800A03EC
i love IT
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You should NOT be releasing the COM object yourself.
If you're creating multiple sheets in your code in one pass, are you creating multiple Excel application objects? Don't! Create one Excel application object and reuse it to create every sheet and workbook your need.
Another possibility is that your using the Excel Interop Assemblies for one version of Excel, say 2003, and your machine doesn't have Office 2003 installed, maybe you have Office 2000 or XP instead. If you're going to use the Interop Assemblies, you have to match the version of Office that's installed on the machine.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hi Dave,
Thanks for helped me and replied to me.
The reusing is a good idea. In fact, my app ran better, but after about 10 excel files that exception was showed.
Note: i have 1000 htm files and i wan convert them into excel.
i love IT
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Hi , Can anyone help me in this problem ...
I am popuating three textboxes in a GridView from my DB ... Now, I want to change values in these textboxes and save all rows when User presses 'Update' Button. What happens is , when 'Update' is pressed, there is PostBack on the page and all values in TextBoxes are shown as Null ..How can I save my previously displayed values in TextBoxes ?
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Watch the forum where you are posting...
Mubashir
Every job is a self portrait of the person who did it.
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VS 2005 (VB.Net)
Is it possible to open a form by a string name without having to declare the form first ,
ie
normally you would
Dim SomeForm as New FormName
SomeForm.Show
What i wasnt yo do is create a dynamic form, and when the user clicks a button it open a corraspoinding form. As each user will have different 'buttons' on there forms i want to have a routine that i can parm a formname in as a string and it open the form.
ie
Dim FormName as String = 'SomeFormName'
FormName.Show
Any idea's 
I really do need help..... all this computer stuff is way over my head !!
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No i don't think so. Why do you need to do it this way?
Posted by The ANZAC
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I do know thre is a way of doing this, as i have seen the code, just carnt remember it. The reason i want to do it this way is that there are a number of users that will be using this application, each one on them will have a 'main selection screen' which will have upwards of 20+ options. each option will open a new form. NOT all the operators will have the same options so rather than have a while load of code declaring every form, i just want a small simple routine.
I really do need help..... all this computer stuff is way over my head !!
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yes its Absolutely possible to do so and can be done very neatly in VB2.0,Just give me a day I will post the Code snippet . but before that I want to know you require that and how you got this nagging idea
Navneet.Hegde
navneethegde@yahoo.co.in
Live Life Kingsize
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we have an inhouse menu type application, when a operator logs onto the stytem , ihave a function that dynamicly creates the menu oprtions for this operator from there profile. ie in design tine the form is blank, but buttons ( options buttons ) , and click even handlers are generated for all the area's they are allowed to access. this info is held in a SQL2005 table
ie .. Operator 1 can access area's 1,2,3, and 4 so would have 4 buttons on screen , Operator 2 can only access area's 1 and 4 hance only has two buttons. As the buttons are dynamicly generated the indexes ( start at 0 ) are never the same. in the example above operator button index 1 would be for Area 2 where as for operator 2 it would be for area 4
i have a work round by Dimming every form and then using the button text in a case statement to determine which button was clicked, but that means every time i add a new form i have to remember to add it in the select case statement ...
If i can use the form name form the SQL table in a simple routine it will save endless pages of coding and i wont have tp remember to keep comming back to the master form and adding the reference in
its the simple idea's that prove to be the hardest !!
I really do need help..... all this computer stuff is way over my head !!
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 :-Ook dear I will just post it as i get back to my PC . I just wanted to know the reason for reaching this end of programming .
my reason for digging this code is that we wanted to build application dynamically and form name were all in database
Navneet.Hegde
navneethegde@yahoo.co.in
navneethegde@gmail.com
navneet.hegde@procit.com
Live Life Kingsize
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Hi
I want to use window's Task Scheduler as a VB.NET application.How can i do that? I tried using in windows service application,but could not reach to perfect solution. and not that i want to have the exact functionality of the task scheduler but with some modifications. Like:
application:
-=-=-=-=-=-=-=-==-=-
1) create a windows service application. and place a textbox and a button. And when i enter the path of the appliction in the textbox and press the button, i should find the apllication in that particular task scheduler's tasks.
2) and by applying some settings.I need to get the application start after systen startup.
please help me in this context
thanks in advanced
tirumal
-- modified at 6:08 Wednesday 27th December, 2006
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I'm planning on using inpout32.dll and I want to control some LEDs, but this is how i want todo it. Im using a program already that sets the bits on/off for the LEDs to be on/off.. Now in this new VB program I want to just turn off 1 of the LEDs of my choice and leave the others as-is. How would I do this? I don't know much about parallel port access. Thanks in advance
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now I am doing the spliting the fileName.when spliting the file remove the file's Extension and i want without extension fileName for only and displaying the fileName in Listbox..pls someone help me...........
Thanking you
somasundaram
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