Send Keys to Specified Application

I was wondering how I could send keys to a specified application of my choice, there doesn't seem to be an easy to use api for this, can anyone please shed some light on the situation. Eg, I would like to be able to send "Hello World" to "Notepad", or "b13" to "Counter-Strike" etc.

Also, it needs to be able to be done that is not in focus (and I don't want it to be called into focus). Surely there must be some way to do this.

Check out sendmessage, however to counter-strike I doubt it will work.

Your going to need to use wm_char as a constant too i believe

I cannot get the following code to work, any suggestions?

Code:

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#include <windows.h>

main()
{
        HWND Notepad;
        Notepad = FindWindow("Notepad",NULL);
        SendMessage(Notepad, WM_KEYDOWN, VkKeyScan('c'), 0);
        SendMessage(Notepad, WM_CHAR, VkKeyScan('c'), 0);
        SendMessage(Notepad, WM_KEYUP, VkKeyScan('c'), 0);
}

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I was thinking then maybe I had to send it to the Edit portion of the window (as metioned here, but that didn't work either as seen below.

Code:

---

#include <windows.h>

main()
{
        HWND Notepad;
        Notepad = FindWindow("Notepad",NULL);
        SendMessage(Notepad, WM_KEYDOWN, VkKeyScan('c'), 0);
        SendMessage(Notepad, WM_CHAR, VkKeyScan('c'), 0);
        SendMessage(Notepad, WM_KEYUP, VkKeyScan('c'), 0);

        /* HWND Notepad;
        Notepad = FindWindow("Notepad",NULL);
        SetForegroundWindow(Notepad);
        keybd_event(VkKeyScan('C'), 1, 0, 0);
        keybd_event(VkKeyScan('C'), 1, KEYEVENTF_KEYUP, 0); */
}

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YAY! I got it to work, I was stupid for not realising FindWindow doesn't find child windows.

Working code below.

Code:

---

#include <windows.h>

main()
{
        HWND Notepad;
        Notepad = FindWindow("Notepad",NULL);
        HWND NotepadChild;
        NotepadChild = FindWindowEx(Notepad, NULL, "Edit", NULL);
        SendMessage(NotepadChild, WM_KEYDOWN, VkKeyScan('c'), 0);
        SendMessage(NotepadChild, WM_CHAR, VkKeyScan('c'), 0);
        SendMessage(NotepadChild, WM_KEYUP, VkKeyScan('c'), 0);

        /* HWND Notepad;
        Notepad = FindWindow("Notepad",NULL);
        SetForegroundWindow(Notepad);
        keybd_event(VkKeyScan('C'), 1, 0, 0);
        keybd_event(VkKeyScan('C'), 1, KEYEVENTF_KEYUP, 0); */
}

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