C# SendKeys to Application

Question

public void Press(Keys key)
{
    WindowsAPI.PostMessage(this.Handle, 260u, new UIntPtr((uint)key), UIntPtr.Zero);
}

public void Release(Keys key)
{
    WindowsAPI.PostMessage(this.Handle, 261u, new UIntPtr((uint)key), UIntPtr.Zero);
}

public void gepardkey(Keys key)
{
    this.Press(key);
    Thread.Sleep(10);
    this.Release(key);
}

private void ragnarokgepard_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    bool flag2 = this.currentHP / this.maxHP *100.0<Convert.ToDouble(this.numHPPercent);
    if (flag2)
    {
        this._windowsAPI.gepardkey(Keys.F1);
    }

    bool flag3 = this.currentSP / this.maxSP *100.0<Convert.ToDouble(this.numSPPercent);
    if (flag3)
    {
        this._windowsAPI.gepardkey(Keys.F2);
    }
}

I got this error http://prntscr.com/lsel0z someone can help me? I already use timer and private void autopots() but this error still popping

this trainer for ragnarok privateserver

Answer 1

i dont know how you have defined the PostMessage API but here my definition:

const UInt32 WM_KEYDOWN = 0x0100;//256
const UInt32 WM_KEYDUP = 0x0101;//257
[DllImport("user32.dll")]
static extern bool PostMessage(IntPtr hWnd, UInt32 Msg, int wParam, int lParam);

and the syntax for keydown for example:(key is virtual key)

    WindowsAPI.PostMessage(this.Handle, WM_KEYDOWN, (int)key, 0);

you are using 260 for value of Keydown and 261 for Keyup.....!!??

Answer 2

this._windowsAPI is null. Make sure that it's initialized in the constructor or when it's declared.

I assume that you've copied the gepardkey method from the WindowsAPI class. If you didn't copy it and it's in the same class as the ragnarokgepard_ProgressChanged method then you can replace the the ragnarokgepard_ProgressChanged method with this one:

private void ragnarokgepard_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    bool flag2 = this.currentHP / this.maxHP *100.0<Convert.ToDouble(this.numHPPercent);
    if (flag2)
    {
        gepardkey(Keys.F1);
    }

    bool flag3 = this.currentSP / this.maxSP *100.0<Convert.ToDouble(this.numSPPercent);
    if (flag3)
    {
        gepardkey(Keys.F2);
    }
}