How to send keyboard input to application with protection [closed]

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does anybody know, how to send key press to application with sendkeys protection ?

I tried sendkeys and to notepad it worked flawlessly, but when I ran target application and tried my program, it doesn't and in notepad it doesn't work too, when this app was running.

I don't know how to bypass that protection.

Answer 1

Don't understand what you mean by protected application?

Either way the SendKeys that comes with the .NET framework is limited. You can use the windows api:

[DllImport("user32.dll")]
private static extern UInt32 SendInput(UInt32 nInputs,[MarshalAs(UnmanagedType.LPArray, SizeConst = 1)] Input[] pInputs, Int32 cbSize);

Also you might want to set the other application to foreground:

[DllImport("User32.dll")]
private static extern int SetForegroundWindow(IntPtr point);

You then get the process of the application's main window handle, something like this:

var processes = Process.GetProcessesByName(processName);
// Note that this line will get the first process with the given name:
// if there are multiple, you will only get the first, and you should
// also include a check that the array isn't empty!
var handle = processes[0].MainWindowHandle;

Then

SetForegroundwindow(handle);
SendInput(....);

If you want to send keys to game applications it needs extra work. Most games make use of DirectX input. This is in a nutshell, if you need more detailed info let me know.

Structs and enum to use with API call:

[StructLayout(LayoutKind.Sequential)]
struct MouseInput
{
    public int dx;
    public int dy;
    public int mouseData;
    public int dwFlags;
    public int time;
    public IntPtr dwExtraInfo;
}

[StructLayout(LayoutKind.Sequential)]
struct KeyboardInput
{
    public short wVk;      //Virtual KeyCode (not needed here)
    public short wScan;    //Directx Keycode 
    public int dwFlags;    //This tells you what is use (Keyup, Keydown..)
    public int time;
    public IntPtr dwExtraInfo;
}

[StructLayout(LayoutKind.Sequential)]
struct HardwareInput
{
    public int uMsg;
    public short wParamL;
    public short wParamH;
}

[StructLayout(LayoutKind.Explicit)]
struct Input
{
    [FieldOffset(0)]
    public int type;
    [FieldOffset(4)]
    public MouseInput mi;
    [FieldOffset(4)]
    public KeyboardInput ki;
    [FieldOffset(4)]
    public HardwareInput hi;
}

[Flags]
public enum KeyFlag
{       
    KeyDown = 0x0000,
    ExtendedKey = 0x0001,
    KeyUp = 0x0002,
    UniCode = 0x0004,
    ScanCode = 0x0008
}