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Capturing Screen Region

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Using QTP we can capture an object or Desktop using CaptureBitmap method. How to capture a region of screen?

It can be done using System.Drawing.Graphics.CopyFromScreen method. Let us see how it can be done using this method.


'Function Name: CaptureRegion
'Argument 1: strPath- File path where you want to store the captured image.
'Argument 2: inX- X co-ordinate
'Argument 3: inY- Y co-ordinate
'Argument 4: inHeight- Image Height
'Argument 5: inWidth- Image Width

Function CaptureRegion(ByVal strPath,ByVal inX,ByVal inY,ByVal inHeight,ByVal inWidth)

'Declaring all the required Local variables
Dim oBitmap,oPixelFormat,oGraphic,oPoint,oSize

'Creating Pixel Format object
Set oPixelFormat=DotNetFactory.CreateInstance("System.Drawing.Imaging.PixelFormat","System.Drawing")

'Point structure to specify x and y to capture a region
Set oPoint=DotNetFactory.CreateInstance("System.Drawing.Point","System.Drawing",inX,inY)

'Size structure for new image
Set oSize=DotNetFactory.CreateInstance("System.Drawing.Size","System.Drawing",inWidth,inHeight)

'Creating Bitmap object with Height, Width and Format32bppArgb pixel format
Set oBitmap=DotNetFactory.CreateInstance("System.Drawing.Bitmap","System.Drawing",inWidth,inHeight,oPixelFormat.Format32bppArgb)

'Graphic object
Set oGraphic=DotNetFactory.CreateInstance("System.Drawing.Graphics","System.Drawing")

'Mapping Bitmap object with Graphic object
Set oGraphic=oGraphic.FromImage(oBitmap)

'Capturing the screen region using CopyFromScreen method
oGraphic.CopyFromScreen oPoint,oPoint,oSize

'Saving the file

Set oPixelFormat=Nothing
Set oPoint=Nothing
Set oSize=Nothing
Set oBitmap=Nothing
Set oGraphic=Nothing
End Function

Dim strPath

'Bringing the screen to be captured to foreground

'Calling CaptureRegion function
Call CaptureRegion(strPath,0,0,20,40)


This technique is very useful as our testing might require capturing region of a screen. Keep visiting for more imaging techniques articles.


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