Ranorex Capture Scrrenshot and store in a folder

[Tushar]

I want to capture screenshot of the desktop and store it in given folder. I am using vb.net as -

Code: Select all

	Dim rect As Rectangle
	Dim img As Bitmap =  Ranorex.Imaging.CaptureDesktopImage(rect)
	Dim filename As String = "C:\Ranorex\screensot.jpg"
	img.Save(filename,System.Drawing.Imaging.ImageFormat.Jpeg)

But I am getting error as 'Object reference not set to an instance of an object.' at last line

Can anybody please help!

[odklizec]

Hi,

In my opinion, it's because you forgot to define rectangle size? Method CaptureDesktopImage requires either 'rectangle' or repo 'element' parameter. Your code, as it is now, creates 0x0 size image and so the 'save to file' fails. Just define rectangle and all should be fine, e.g. like this...

Code: Select all

Dim rect As New Rectangle(0, 0, 200, 200)

[Tushar]

Hello Guru,

Thanks a lot, it worked!

Is there any way I can capture the screenshot of entire desktop without specifying coordinates?

I have to run the same test on different devices so Test should adapt target device screen coordinates.

Thanks again,
Tushar

[odklizec]

Hi,

In my opinion, the easiest way would be to create a repo element, pointing to 'desktop' element. And then simply pass that repo element to CaptureDesktopImage method. Here is an example code:

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Public Sub CaptureDesktop(argument1 As Adapter)
    Dim image As Bitmap = Imaging.CaptureDesktopImage(argument1.Element)
    image.Save("C:\Ranorex\test.jpg", System.Drawing.Imaging.ImageFormat.Jpeg)
End Sub

Eventually, it seems that sending 'null' parameter should instruct method to create a screenshot of the whole desktop. But it throws "A generic error occurred in GDI+" error on my PC