System Display Scale Causing ScreenShot to be Out of Bounds
Hi, iam using below code to take a screenshot of the form so i can then print but if the System Display Scale is set at more than 100% the image is magnified and is larger than the jpg size.
Is there a way to handle the scale using code before executing the below sub?
Code:
Private Sub TakeSSData_Click(sender As Object, e As EventArgs) Handles TakeSSData.Click
Me.Hide()
Dim SC As New ScreenShot.ScreenCapture
Dim MyBitMap As Bitmap = SC.CaptureDeskTopRectangle(New Rectangle(Me.Location.X, Me.Location.Y, Me.Width, Me.Height), Form1.Width, Form1.Height)
Using fsd As New SaveFileDialog
fsd.Filter = "jpg files (*.jpg)|*.jpg|All files (*.*)|*.*"
fsd.FileName = "data"
fsd.InitialDirectory = My.Computer.FileSystem.SpecialDirectories.MyDocuments & "\weights"
If fsd.ShowDialog() = Windows.Forms.DialogResult.OK Then
MyBitMap.Save(fsd.FileName, Imaging.ImageFormat.Jpeg)
End If
End Using
End Sub
Re: System Display Scale Causing ScreenShot to be Out of Bounds
No idea what ScreenShot.ScreenCapture is. It appears to be a third-party type.
Re: System Display Scale Causing ScreenShot to be Out of Bounds
Quote:
Originally Posted by
jmcilhinney
No idea what ScreenShot.ScreenCapture is. It appears to be a third-party type.
sorry jm, cannot remember where i got this from it was over 10 years ago
Code:
Imports System
Imports System.Runtime.InteropServices
Imports System.Drawing
Imports System.Drawing.Imaging
Namespace ScreenShot
'/ Provides functions to capture the entire screen, or a particular window, and save it to a file.
Public Class ScreenCapture
'/ Creates an Image object containing a screen shot of the entire desktop
Public Function CaptureScreen() As Image
Return CaptureWindow(User32.GetDesktopWindow())
End Function 'CaptureScreen
'/ Creates an Image object containing a screen shot of a specific window
Public Function CaptureWindow(ByVal handle As IntPtr) As Image
Dim SRCCOPY As Integer = &HCC0020
' get te hDC of the target window
Dim hdcSrc As IntPtr = User32.GetWindowDC(handle)
' get the size
Dim windowRect As New User32.RECT
User32.GetWindowRect(handle, windowRect)
Dim width As Integer = windowRect.right - windowRect.left
Dim height As Integer = windowRect.bottom - windowRect.top
' create a device context we can copy to
Dim hdcDest As IntPtr = GDI32.CreateCompatibleDC(hdcSrc)
' create a bitmap we can copy it to,
' using GetDeviceCaps to get the width/height
Dim hBitmap As IntPtr = GDI32.CreateCompatibleBitmap(hdcSrc, width, height)
' select the bitmap object
Dim hOld As IntPtr = GDI32.SelectObject(hdcDest, hBitmap)
' bitblt over
GDI32.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, SRCCOPY)
' restore selection
GDI32.SelectObject(hdcDest, hOld)
' clean up
GDI32.DeleteDC(hdcDest)
User32.ReleaseDC(handle, hdcSrc)
' get a .NET image object for it
Dim img As Image = Image.FromHbitmap(hBitmap)
' free up the Bitmap object
GDI32.DeleteObject(hBitmap)
Return img
End Function 'CaptureWindow
'/ Captures a screen shot of a specific window, and saves it to a file
Public Sub CaptureWindowToFile(ByVal handle As IntPtr, ByVal filename As String, ByVal format As ImageFormat)
Dim img As Image = CaptureWindow(handle)
img.Save(filename, format)
End Sub 'CaptureWindowToFile
'/ Captures a screen shot of the entire desktop, and saves it to a file
Public Sub CaptureScreenToFile(ByVal filename As String, ByVal format As ImageFormat)
Dim img As Image = CaptureScreen()
img.Save(filename, format)
End Sub 'CaptureScreenToFile
Public Function CaptureDeskTopRectangle(ByVal CapRect As Rectangle, ByVal CapRectWidth As Integer, ByVal CapRectHeight As Integer) As Bitmap
'/ Returns BitMap of the region of the desktop, similar to CaptureWindow, but can be used to
'/ create a snapshot of the desktop when no handle is present, by passing in a rectangle
'/ Grabs snapshot of entire desktop, then crops it using the passed in rectangle's coordinates
Dim SC As New ScreenShot.ScreenCapture
Dim bmpImage As New Bitmap(SC.CaptureScreen)
Dim bmpCrop As New Bitmap(CapRectWidth, CapRectHeight, bmpImage.PixelFormat)
Dim recCrop As New Rectangle(CapRect.X, CapRect.Y, CapRectWidth, CapRectHeight)
Dim gphCrop As Graphics = Graphics.FromImage(bmpCrop)
Dim recDest As New Rectangle(0, 0, CapRectWidth, CapRectHeight)
gphCrop.DrawImage(bmpImage, recDest, recCrop.X, recCrop.Y, recCrop.Width,
recCrop.Height, GraphicsUnit.Pixel)
Return bmpCrop
End Function
'/ Helper class containing Gdi32 API functions
Private Class GDI32
Public SRCCOPY As Integer = &HCC0020
' BitBlt dwRop parameter
Declare Function BitBlt Lib "gdi32.dll" (
ByVal hDestDC As IntPtr,
ByVal x As Int32,
ByVal y As Int32,
ByVal nWidth As Int32,
ByVal nHeight As Int32,
ByVal hSrcDC As IntPtr,
ByVal xSrc As Int32,
ByVal ySrc As Int32,
ByVal dwRop As Int32) As Int32
Declare Function CreateCompatibleBitmap Lib "gdi32.dll" (
ByVal hdc As IntPtr,
ByVal nWidth As Int32,
ByVal nHeight As Int32) As IntPtr
Declare Function CreateCompatibleDC Lib "gdi32.dll" (
ByVal hdc As IntPtr) As IntPtr
Declare Function DeleteDC Lib "gdi32.dll" (
ByVal hdc As IntPtr) As Int32
Declare Function DeleteObject Lib "gdi32.dll" (
ByVal hObject As IntPtr) As Int32
Declare Function SelectObject Lib "gdi32.dll" (
ByVal hdc As IntPtr,
ByVal hObject As IntPtr) As IntPtr
End Class 'GDI32
'/ Helper class containing User32 API functions
Public Class User32
<StructLayout(LayoutKind.Sequential)>
Public Structure RECT
Public left As Integer
Public top As Integer
Public right As Integer
Public bottom As Integer
End Structure 'RECT
Declare Function GetDesktopWindow Lib "user32.dll" () As IntPtr
Declare Function GetWindowDC Lib "user32.dll" (
ByVal hwnd As IntPtr) As IntPtr
Declare Function ReleaseDC Lib "user32.dll" (
ByVal hwnd As IntPtr,
ByVal hdc As IntPtr) As Int32
Declare Function GetWindowRect Lib "user32.dll" (
ByVal hwnd As IntPtr,
ByRef lpRect As RECT) As Int32
End Class 'User32
End Class 'ScreenCapture
End Namespace 'ScreenShot
