How to send keyboard key in my application?

I'm currently using SendKeys.SendWait(text); in C# but SendKeys sending the key global and I have to activate my application and then send it. And another problem is when 开发者_运维技巧I type something in my keyboard (in another app) and the SendKeys function activates (in my app) mistakes happen.

So how can I send a message to my application regardless what application is active and what I type in my keyboard?

SendMessage() does what you want. You'll need to use it like:

[DllImport("user32.dll", CharSet = CharSet.Auto)]
static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);

const UInt32 WM_CHAR = 0x0102;
const int VK_Q = 0x51; // taken from http://msdn.microsoft.com/en-us/library/dd375731(v=vs.85).aspx

SendMessage(handleToTheInputForm, WM_CHAR, VK_Q, 1);

You will need to get a handle on the other application's window so that you can bring it to focus and reliably send your keystrokes to it,

Have a look at this tutorial

http://www.codeproject.com/KB/cs/SendKeys.aspx