- 1 year ago
Sending Keystrokes to Hidden Window via JNA
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To send keystrokes to a hidden window using JNA (Java Native Access), you can follow these steps:
Import the necessary JNA classes:
javaimport com.sun.jna.Native;
import com.sun.jna.platform.win32.User32;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.platform.win32.WinUser;
Define the key codes for the keystrokes you want to send:
javafinal int VK_A = 0x41;
final int VK_B = 0x42;
// Add more key codes as needed
Get the handle (HWND) of the target window:
javaHWND targetWindow = User32.INSTANCE.FindWindow(null, "Window Title");
Set the target window as the active/focused window:
javaUser32.INSTANCE.SetForegroundWindow(targetWindow);
Simulate key presses using the key codes:
javaUser32.INSTANCE.keybd_event(VK_A, 0, 0, 0); // Press 'A'
User32.INSTANCE.keybd_event(VK_B, 0, 0, 0); // Press 'B'
// Add more key presses as needed
// Release the keys
User32.INSTANCE.keybd_event(VK_A, 0, WinUser.KEYEVENTF_KEYUP, 0);
User32.INSTANCE.keybd_event(VK_B, 0, WinUser.KEYEVENTF_KEYUP, 0);
// Release more keys as needed
Optionally, you can use a small delay between key presses to ensure proper execution:
javatry {
Thread.sleep(100); // Adjust the delay as needed
} catch (InterruptedException e) {
e.printStackTrace();
}
By following these steps, you can use JNA to send keystrokes to a hidden window in Windows. Make sure to replace "Window Title" with the actual title of the target window you want to send keystrokes to.