[RESOLVED] ListView Refresh + Screen Capture problemas
Hello,
I'm developing a small screen capture application to learn some functions like bitmap graphics and I'm having a problem with 3 things, hope you could help me.
1. ListView Refresh/Update. I have a form with a listview that shows thumbnails for all screenshots taken. When the form loads it works very good, but I would like it to refresh. So I added a ContextMenuStrip and when user click refresh it was supposed to refresh and update the screenshots again. If I call my function again, it works pretty good but adds the images again. If I use the listview1.clear() or listview1.items.clear() and then call my function, all the thumbnails will be the same image (first image in folder). Its weird because seems to be the clear "killing" my function. Any suggestion?
Code:
Dim imagecoll As New Collection() 'Image paths will be stored in this collection
Dim Limglst As New ImageList() 'Large ImageList for our ListVie
Dim SelectedDirectory As String
Dim thmbNailWidth As Integer
Dim thmbNailHeight As Integer
Dim img, pimg As Bitmap
Dim imgsCurnCnt As String
Dim StartTime As DateTime
Dim i As Integer = 0
'Dim disimg As Bitmap
Function GetIndexofImg() As Integer
If i < Me.lvImgs.Items.Count Then
i += 1
Return i
End If
End Function
Sub ImportImages()
Dim userName As String = "ScreenShots"
Dim pth As String
Dim myDir = My.Settings.saveTo & "/" & userName
If Directory.Exists(myDir) Then
' Got files in direcotry!
For Each pth In Directory.GetFiles(My.Settings.saveTo & userName)
Dim f() As String
f = Split(pth, "\") 'To get the file name
Array.Reverse(f)
Try
imagecoll.Add(pth, f(0)) 'Add filename as key to retrive later
Catch
End Try
Try
If Directory.Exists(SelectedDirectory) Then
File.Copy(pth, SelectedDirectory & "\" & f(0))
MsgBox(SelectedDirectory)
End If
'MsgBox(pth & " " & SelectedDirectory)
Catch ex As Exception
'MsgBox(ex.Message, MsgBoxStyle.Critical)
End Try
Next
'Display the images
Display(Directory.GetFiles(My.Settings.saveTo & "/" & userName))
End If
End Sub
Sub Display(ByVal files() As String)
System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.WaitCursor
Dim fnames() As String = files
If thmbNailWidth <> 0 AndAlso thmbNailHeight <> 0 Then
Limglst.ImageSize = New Size(thmbNailWidth, thmbNailHeight)
Else
'Default size
thmbNailWidth = 100
thmbNailHeight = 100
Limglst.ImageSize = New Size(thmbNailWidth, thmbNailHeight)
End If
Limglst.ColorDepth = ColorDepth.Depth32Bit
showimages(fnames)
Try
Me.lvImgs.LargeImageList = Limglst
Catch
End Try
Dim fn As String
For Each fn In fnames
Try
Dim picwh As New Bitmap(fn)
Dim fname As New IO.FileInfo(fn)
Me.lvImgs.Items.Add(fname.Name, GetIndexofImg)
picwh.Dispose()
'MsgBox(fn)
Catch ex As Exception
'MsgBox(ex.Message)
End Try
Next
System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.Default
End Sub
Sub showimages(ByVal imgs() As String)
Dim image As String
For Each image In imgs
Try
pimg = New Bitmap(image)
Limglst.Images.Add(pimg)
'would occur if the file is not an image file
Catch Ex As Exception
'MsgBox(ex.Message)
End Try
Next
End Sub
I just call ImportImages() function.
2. Active Window print screen. Well, I managed how to do it, but the print screen in the active Windows gets some borders and not only the active window. It seems that gets the "aero theme glow" so the print also takes some o the backgound in left, right and bottom. Any suggestions in how to avoid this?
My work to get the active window:
Code:
If ctrlkey And shiftkey And W = True Then
DwmEnableComposition(False)
Dim hWnd As IntPtr = GetForegroundWindow() 'Get the foreground window handle
If Not hWnd.Equals(IntPtr.Zero) Then 'Check if there is a foreground window
Dim rec As New RECT
GetWindowRect(hWnd, rec) 'Get the rectangle of the foreground window into a RECT structure
CaptureScreen(New Rectangle(rec.left, rec.top, rec.right - rec.left, rec.bottom - rec.top))
End If
DwmEnableComposition(True)
End If
And the CaptureScreen Function:
Code:
Dim bmp As New Bitmap(RegionRect.Width, RegionRect.Height)
Dim grfx As Graphics = Graphics.FromImage(bmp)
grfx.CopyFromScreen(RegionRect.X, RegionRect.Y, 0, 0, RegionRect.Size, CopyPixelOperation.SourceCopy)
bmp.Save(captureSavePath)
3. Finally, I have the region screen that made na approach with success, but only works with one monitor. My aproach creates a full creen form with opacity and the user draws a rectangle for the desired área. I acomplished the full screen form to open in the screen where the mouse pointer is, but if the form opens in Monitor2, the screenshot is the selected área but from Monitor1. Any suggestion?
Code:
Private Sub regionform_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Me.TopMost = True
Me.WindowState = FormWindowState.Maximized
Me.Width = Screen.AllScreens.Sum(Function(s As Screen) s.Bounds.Width)
Me.Height = Screen.AllScreens.Sum(Function(s As Screen) s.Bounds.Height)
Timer1.Enabled = True
Timer1.Interval = 1
Me.Cursor = Cursors.Cross
End Sub
Code:
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
Using myBrush As New System.Drawing.SolidBrush(Color.FromArgb(255, System.Drawing.Color.White))
Using pen As New Pen(Color.Red, 5)
e.Graphics.DrawRectangle(pen, mRect)
e.Graphics.FillRectangle(myBrush, mRect)
End Using
End Using
End Sub
Code:
Protected Overrides Sub OnMouseDown(ByVal e As MouseEventArgs)
mRect = New Rectangle(e.X, e.Y, 0, 0)
Me.Invalidate()
End Sub
Protected Overrides Sub OnMouseMove(ByVal e As MouseEventArgs)
If e.Button = Windows.Forms.MouseButtons.Left Then
mRect = New Rectangle(mRect.Left, mRect.Top, e.X - mRect.Left, e.Y - mRect.Top)
Me.Invalidate()
End If
End Sub
Code:
Dim captureSavePath As String = String.Format("{0}\{1}\" & My.Settings.defname & "{2}." & My.Settings.format, savePath, userName, dateString)
Dim bmp As New Bitmap(mRect.Width, mRect.Height)
Dim grfx As Graphics = Graphics.FromImage(bmp)
grfx.CopyFromScreen(mRect.X, mRect.Y, 0, 0, mRect.Size, CopyPixelOperation.SourceCopy)
bmp.Save(captureSavePath)
Hope that you could help. Maybe those could be silly questions but I can't figure it out :(
BTW, if you have time, what could be the approach to user defined hotkeys?
Re: ListView Refresh + Screen Capture problems
Hello,
Sorry to update the thread but point number 1 is solved. It was needed to reset the i variable (i = 0) and dispose the Limglst var. :)
Now just 2 points remaining. If someone could help that would be great.
Edit 1:
Another problem solved. The region form that didn't worked in multiple monitors, since it was taking print screen of the same primary screen is solved. If you need, just change the line:
Code:
grfx.CopyFromScreen(mRect.X, mRect.Y, 0, 0, mRect.Size, CopyPixelOperation.SourceCopy)
To:
Code:
grfx.CopyFromScreen(Me.Location.X + mRect.X, Me.Location.Y + mRect.Y, 0, 0, mRect.Size, CopyPixelOperation.SourceCopy)
This way the Copy from screen will start from the point where the form was created.
Now it's only needed to solve one of the problems. How to take off the aero style to make a print screen from active window. Any suggestion?
Edit2:
Solved the problema in Aero borders to take screenshots. Basically created a function to check the OS. If the OS is >= 6 (Vista), take of the 7 twips from the screenshot.
