Module: Watir::ScreenCapture

Defined in:
lib/watir/screen_capture.rb

Constant Summary collapse

KEYEVENTF_KEYUP = 
0x2
SW_HIDE = 
0
SW_SHOW = 
5
SW_SHOWNORMAL = 
1
VK_CONTROL = 
0x11
VK_F4 = 
0x73
VK_MENU = 
0x12
VK_RETURN = 
0x0D
VK_SHIFT = 
0x10
VK_SNAPSHOT = 
0x2C
VK_TAB = 
0x09
GMEM_MOVEABLE = 
0x0002
CF_TEXT = 
1

Instance Method Summary collapse

Instance Method Details

#screen_capture(filename, active_window_only = false, save_as_bmp = false) ⇒ Object

this method saves the current window or whole screen as either a bitmap or a jpeg It uses paint to save the file, so will barf if a duplicate filename is selected, or the path doesnt exist etc

* filename        - string  -  the name of the file to save. If its not fully qualified the current directory is used
* active_window   - boolean - if true, the whole screen is captured, if false,  just the active window is captured
* save_as_bmp     - boolean - if true saves the file as a bitmap, saves it as a jpeg otherwise



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# File 'lib/watir/screen_capture.rb', line 26

def screen_capture(filename , active_window_only=false, save_as_bmp=false)


  keybd_event = Win32API.new("user32", "keybd_event", ['I','I','L','L'], 'V')
  vkKeyScan = Win32API.new("user32", "VkKeyScan", ['I'], 'I')
  winExec = Win32API.new("kernel32", "WinExec", ['P','L'], 'L')
  openClipboard = Win32API.new('user32', 'OpenClipboard', ['L'], 'I')
  setClipboardData = Win32API.new('user32', 'SetClipboardData', ['I', 'I'], 'I')
  closeClipboard = Win32API.new('user32', 'CloseClipboard', [], 'I')
  globalAlloc = Win32API.new('kernel32', 'GlobalAlloc', ['I', 'I'], 'I')
  globalLock = Win32API.new('kernel32', 'GlobalLock', ['I'], 'I')
  globalUnlock = Win32API.new('kernel32', 'GlobalUnlock', ['I'], 'I')
  memcpy = Win32API.new('msvcrt', 'memcpy', ['I', 'P', 'I'], 'I')

 
  filename = Dir.getwd.tr('/','\\') + '\\' + filename unless filename.index('\\')

  if active_window_only ==false
      keybd_event.Call(VK_SNAPSHOT,0,0,0)   # Print Screen
  else
      keybd_event.Call(VK_SNAPSHOT,1,0,0)   # Alt+Print Screen
  end 

  winExec.Call('mspaint.exe', SW_SHOW)
  sleep(1)
 
  # Ctrl + V  : Paste
  keybd_event.Call(VK_CONTROL, 1, 0, 0)
  keybd_event.Call(vkKeyScan.Call(?V), 1, 0, 0)
  keybd_event.Call(vkKeyScan.Call(?V), 1, KEYEVENTF_KEYUP, 0)
  keybd_event.Call(VK_CONTROL, 1, KEYEVENTF_KEYUP, 0)


  # Alt F + A : Save As
  keybd_event.Call(VK_MENU, 1, 0, 0)
  keybd_event.Call(vkKeyScan.Call(?F), 1, 0, 0)
  keybd_event.Call(vkKeyScan.Call(?F), 1, KEYEVENTF_KEYUP, 0)
  keybd_event.Call(VK_MENU, 1, KEYEVENTF_KEYUP, 0)
  keybd_event.Call(vkKeyScan.Call(?A), 1, 0, 0)
  keybd_event.Call(vkKeyScan.Call(?A), 1, KEYEVENTF_KEYUP, 0)
  sleep(1)

  # copy filename to clipboard
  hmem = globalAlloc.Call(GMEM_MOVEABLE, filename.length+1)
  mem = globalLock.Call(hmem)
  memcpy.Call(mem, filename, filename.length+1)
  globalUnlock.Call(hmem)
  openClipboard.Call(0)
  setClipboardData.Call(CF_TEXT, hmem) 
  closeClipboard.Call 
  sleep(1)
  
  # Ctrl + V  : Paste
  keybd_event.Call(VK_CONTROL, 1, 0, 0)
  keybd_event.Call(vkKeyScan.Call(?V), 1, 0, 0)
  keybd_event.Call(vkKeyScan.Call(?V), 1, KEYEVENTF_KEYUP, 0)
  keybd_event.Call(VK_CONTROL, 1, KEYEVENTF_KEYUP, 0)

  if save_as_bmp == false
    # goto the combo box
    keybd_event.Call(VK_TAB, 1, 0, 0)
    keybd_event.Call(VK_TAB, 1, KEYEVENTF_KEYUP, 0)
    sleep(0.5)

    # select the first entry with J
    keybd_event.Call(vkKeyScan.Call(?J), 1, 0, 0)
    keybd_event.Call(vkKeyScan.Call(?J), 1, KEYEVENTF_KEYUP, 0)
    sleep(0.5)
  end  

  # Enter key
  keybd_event.Call(VK_RETURN, 1, 0, 0)
  keybd_event.Call(VK_RETURN, 1, KEYEVENTF_KEYUP, 0)
  sleep(1)
 
  # Alt + F4 : Exit
  keybd_event.Call(VK_MENU, 1, 0, 0)
  keybd_event.Call(VK_F4, 1, 0, 0)
  keybd_event.Call(VK_F4, 1, KEYEVENTF_KEYUP, 0)
  keybd_event.Call(VK_MENU, 1, KEYEVENTF_KEYUP, 0)
  sleep(1) 

end