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you can do that by a simple P/Invoke:
mciSendStringA("set CDAudio door open", "", 0, 0)
and that also works for data CD and DVD
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read formatted code with indentation, so please use PRE tags for code snippets.
I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).
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How do you make an input that the user key in a textbox to be a percentage number?
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Ummmm, Divide (/) by 100 
I don't speak Idiot - please talk slowly and clearly
'This space for rent'
Driven to the arms of Heineken by the wife
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Just make it a number and put a label with "%" in it behind.
Then on change parse the value to %
Easier than messing around with controlling inputs.
------------------------------------
I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
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Use a NumericUpDown with the max/min set to 100/0, and a label next to it for the % sign.
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Hello Everybody,
I am trying to print the Image which have the text. It printing properly. But in Text Portion Displays some distervence in printing.
Thanks
If you can think then I Can.
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Sorry, but i haven't got a clue what you are talking about, it doesn't make alot of sense.
Can you maybe reword it.....
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I am Creating an Image by using Text. It is showing fine. But I am Trying to print this Image then the Text Quality is not Fine.
Code Is simple
g.DrawImage(this.Ibarcode , DrawRectangle)
If you can think then I Can.
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It's hard to say without being able to see what the image looks like when it is printed. It could be some scaling problem or resolution problem.
You could perhaps try sending the image and the text to the printer separately instead of writing the text on the image?!?!
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But my requirement is crating image by using text. then it's depend on user to print or Export in Image.
If you can think then I Can.
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i am trying to convert c# to vb.net of this project!
.NET TWAIN image scanner[^]
i did it and it works on select source, and scan preview but not when i click scan then it throws me error "Arithmetic operation resulted in an overflow." in winmsga.x = CShort(pos)
much of code! 
here is what i have done:
TwainLib[^]
Twain[^]
GDIPlusLib[^]
And my form[^]
only two things got errors when i converted code!
first one is:
<StructLayout(LayoutKind.Sequential, Pack:=4)> _
Friend Structure WINMSG
Public hwnd As IntPtr
Public message As Integer
Public wParam As IntPtr
Public lParam As IntPtr
Public time As Integer
Public x As Integer
Public y As Integer
End Structure
and
Private winmsg As WINMSG
so i just renamed it to winmsga maybe i did something wrong here?
and other error was:
Protected Function GetPixelInfo(ByVal bmpptr As IntPtr) As IntPtr
bmi = New BITMAPINFOHEADER()
Marshal.PtrToStructure(bmpptr, bmi)
bmprect.X = InlineAssignHelper(bmprect.Y, 0)
bmprect.Width = bmi.biWidth
bmprect.Height = bmi.biHeight
If bmi.biSizeImage = 0 Then
bmi.biSizeImage = ((((bmi.biWidth * bmi.biBitCount) + 31) And Not 31) >> 3) * bmi.biHeight
End If
Dim p As Integer = bmi.biClrUsed
If (p = 0) AndAlso (bmi.biBitCount <= 8) Then
p = 1 << bmi.biBitCount
End If
p = (p * 4) + bmi.biSize + CInt(bmpptr)
Return New (p,IntPtr) 'so i made like this (Return New System.IntPtr(p))
End Function
can annyone help?
thanks!
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ahhhh i hate this! :P
i made it work!
thanks anyway
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You should be chuffed you got it working. It also shows the guys on CP that you are willing to work at it yourself, and so will be much more willing to help in the future. Congrats 
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thanks! :P
btw i forgot to post a solution!
the only thing why it wasnt working was this part:
winmsga.hwnd = m.HWnd
winmsga.message = m.Msg
winmsga.wParam = m.WParam
winmsga.lParam = m.LParam
winmsga.time = GetMessageTime()
winmsga.x = pos 'just removed CShort()
winmsga.y = (pos >> 16) 'same here
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Please tell me there is a better way to make a pacman like shape move across my form...
Public Class Form1
Dim formSurface As Graphics = Me.CreateGraphics
Dim intLoop As Integer = 0
Private Sub btnStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnStart.Click
tmrMove.Enabled = True
End Sub
Private Sub tmrMove_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tmrMove.Tick
formSurface.Clear(Color.Black)
Select Case intLoop
Case 0
formSurface.DrawImage(My.Resources.pacmanopen, 10, 75)
Case 1
formSurface.DrawImage(My.Resources.pacmanopen, 11, 75)
Case 2
formSurface.DrawImage(My.Resources.pacmanopen, 12, 75)
Case 3
formSurface.DrawImage(My.Resources.pacmanopen, 13, 75)
Case 4
formSurface.DrawImage(My.Resources.pacmanopen, 14, 75)
Case 5
formSurface.DrawImage(My.Resources.pacmanopen, 15, 75)
End Select
intLoop += 1
End Sub
End Class
Could I possibly do something like...
Case 0 to 100
formSurface.DrawImage(My.Resources.pacmanopen, intX, 75)
and then add 1 to intX each time? I'm open to any ideas...
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yes, you should keep your shape's location in some variable(s). And paint only in the Paint handler.
This article[^] will give you the principles and an example; it is a C# example, but that only constitutes a different syntax, it does not affect the principles.
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read formatted code with indentation, so please use PRE tags for code snippets.
I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).
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Alright thanks I'll go look at it right now. I knew there was an easier way..
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The whole approach of using winforms is doomed to failure. You should use XNA, or perhaps WPF, something DirectX based.
Christian Graus
Driven to the arms of OSX by Vista.
Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.
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Sadly it's for a school project and I have to do it my teachers way...but I'll defiantely look into that stuff for future programs that I do on my own time.
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hello!
i wanna add a context menu as "Close CD Tray" in CD drive's context menu.
but i can't only CD drive's context menu.
my context menu is working on all drives as C:, D:, E: so on.
i wanna show it just only on CD drive's context menu.
could u help me pls?
i'll thz u very much....
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You will have to check which drive is selected before you create the context menu.
Then when the user clicks the cd drive you show your menu, otherwise you just show the default one.
My advice is free, and you may get what you paid for.
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If you work with a 32bit Windows take loo at this[^]
On a 64b windows it won't work.
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I am having a major problem with a date. (One of the day, month, year kind!) The problem is conversion from a string to a date.
Either I am in perpetual brain fart mode or something odd is going on.
This is a data line being imported
nc,71401286,0,"Thursday, May 20, 2010 01:00:54 UTC",38.8335,-122.8778,1.0,1.80,12,"Northern California"
This is the code that gets the date part and changes it into "dd/MM/yyyy HH:mm:ss"
astrData = strLine.Split(",")
sbldValues = New StringBuilder(strCMD & astrData(QUAKE_ID) & QUOTE & COMMA)
strPartLine = astrData(QUAKE_ID) & COMMA
'Next is the networkID
sbldValues.Append(QUOTE & astrData(NET_SOURCE) & QUOTE & COMMA)
strPartLine &= astrData(NET_SOURCE) & COMMA
'Next is the version which is also a string
sbldValues.Append(QUOTE & astrData(VERSION_NO) & QUOTE & COMMA)
strPartLine &= astrData(VERSION_NO) & COMMA
strEventDate = CDate(Trim(astrData(DATE_PART_1) _
& astrData(DATE_PART_2).Substring(0, astrData(DATE_PART_2).Length - 4))).ToString("dd/MM/yyyy HH:mm:ss")
sbldValues.Append("CONVERT(datetime,'" & strEventDate & "',103)" & COMMA)
If bFileStartDone = False Then
m_strFileStartDate = strEventDate
m_strFileEndDate = strEventDate
bFileStartDone = True
Else
m_strFileEndDate = strEventDate
End If
strPartLine &= strEventDate & COMMA
(COMMA and QUOTE are just constants as I find these easier to read and debug.)
Later on in the code there is this section:
strDate1 = Format(drowData("Date_Time"), "dd/MM/yyyy HH:mm:ss")
strDate2 = astrValues(EVENT_DATE) 'This is already in the right format
If strDate1 <> strDate2 Then
bDifferences = True
intDateDiff = DateDiff(DateInterval.Minute, drowData("Date_Time"), CDate(strDate2))
If intDateDiff > intTimeVariance Then
The second it hits the CDate(strDate2) I get the exception below
System.InvalidCastException was unhandled
Message="Conversion from string "19/05/2010 02:12:54" to type 'Date' is not valid."
Source="Microsoft.VisualBasic"
StackTrace:
at Microsoft.VisualBasic.CompilerServices.Conversions.ToDate(String Value)
My problem is that this runs in a test bed version, and in a compiled exe as part of a windows forms project, but NOT when it is running in a service.
The code is identical - literally - as the class in which this resides is designed to work with the service or the windows program, thus the code file is just copied between the two.
The service is running under 'local system' and I am suspecting the this may have something to do with it, but what? Why should a date conversion behave differently?  Have I missed something somewhere?
Edited for a speeling era
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