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I'm curious to know how Top RPA tools like AA and UiPath simulate keystroke to the applications. I've built an application with use of Keybd_event to simulate keystrokes but I keep facing the issue of scan code parameter of keybd_event - as it required to perform keystroke in Citrix environment.

private void PressKeyVK(int eKeys, bool bHoldKeydown, bool bRelease) { int lScan, lExtended; lScan = MapVirtualKey(eKeys, 1); lExtended = 0; if (lScan == 0) lExtended = (int)KeyBoardEventEnums.KEYEVENTF_EXTENDEDKEY; lScan = MapVirtualKey(eKeys, 0); if (!bRelease) keybd_event((byte)eKeys, (byte)lScan, (uint)lExtended, UIntPtr.Zero); if (!bHoldKeydown) keybd_event((byte)eKeys, (byte)lScan, (uint)KeyBoardEventEnums.KEYEVENTF_KEYUP | (uint)lExtended, UIntPtr.Zero); }

1 Answer

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by (9.5k points)

RPA is such a versatile tool, it uses different technology for a different layer. 

 For Local machines, it uses sendmessage and postmessage APIs. For thin layer applications such as RDP and Citrix, it simulates software keypress similar to application.sendkeys

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